Release version

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: ['1.23', '1.24', '1.25']
+        go-version: ['1.24', '1.25']
 
     steps:
     - name: Checkout code
@@ -34,8 +34,8 @@ jobs:
     - name: Download dependencies
       run: go mod download
 
-    - name: Run tests
+    - name: Run unit tests
-      run: go test -v -race -coverprofile=coverage.out -covermode=atomic ./...
+      run: make test
 
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v4
@@ -57,11 +57,13 @@ jobs:
       with:
         go-version: '1.25'
 
-    - name: golangci-lint
+    - name: Install golangci-lint
-      uses: golangci/golangci-lint-action@v6
+      run: |
-      with:
+        curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin latest
-        version: latest
+        echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
-        args: --config=.golangci.json
+
+    - name: Run linter
+      run: make lint
 
   build:
     name: Build
@@ -76,8 +78,20 @@ jobs:
       with:
         go-version: '1.25'
 
-    - name: Build
+    - name: Download dependencies
-      run: go build -v ./cmd/relspec
+      run: go mod download
+
+    - name: Build binary
+      run: make build
+
+    - name: Verify binary exists
+      run: |
+        if [ ! -f build/relspec ]; then
+          echo "Error: Binary not found at build/relspec"
+          exit 1
+        fi
+        echo "Build successful: build/relspec"
+        ls -lh build/relspec
 
     - name: Check mod tidiness
       run: |

.github/workflows/integration-tests.yml

@@ -0,0 +1,91 @@
+name: Integration Tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  integration-tests:
+    name: Integration Tests
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.25'
+
+    - name: Cache Go modules
+      uses: actions/cache@v4
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
+    - name: Download dependencies
+      run: go mod download
+
+    - name: Start PostgreSQL container
+      run: |
+        docker run -d \
+          --name relspec-test-postgres \
+          --network host \
+          -e POSTGRES_USER=relspec \
+          -e POSTGRES_PASSWORD=relspec_test_password \
+          -e POSTGRES_DB=relspec_test \
+          postgres:16-alpine
+
+    - name: Wait for PostgreSQL to be ready
+      run: |
+        echo "Waiting for PostgreSQL to start..."
+        for i in {1..30}; do
+          if docker exec relspec-test-postgres pg_isready -U relspec -d relspec_test > /dev/null 2>&1; then
+            echo "PostgreSQL is ready!"
+            break
+          fi
+          echo "Waiting... ($i/30)"
+          sleep 1
+        done
+        sleep 2
+
+    - name: Copy init script into container
+      run: |
+        docker cp tests/postgres/init.sql relspec-test-postgres:/tmp/init.sql
+
+    - name: Initialize test database
+      run: |
+        docker exec relspec-test-postgres psql -U relspec -d relspec_test -f /tmp/init.sql
+
+    - name: Verify database setup
+      run: |
+        echo "Verifying database initialization..."
+        docker exec relspec-test-postgres psql -U relspec -d relspec_test -c "
+        SELECT
+          (SELECT COUNT(*) FROM pg_namespace WHERE nspname NOT IN ('pg_catalog', 'information_schema', 'pg_toast') AND nspname NOT LIKE 'pg_%') as schemas,
+          (SELECT COUNT(*) FROM pg_tables WHERE schemaname NOT IN ('pg_catalog', 'information_schema')) as tables,
+          (SELECT COUNT(*) FROM pg_views WHERE schemaname NOT IN ('pg_catalog', 'information_schema')) as views,
+          (SELECT COUNT(*) FROM pg_sequences WHERE schemaname NOT IN ('pg_catalog', 'information_schema')) as sequences;
+        "
+
+    - name: Run integration tests
+      env:
+        RELSPEC_TEST_PG_CONN: postgres://relspec:relspec_test_password@localhost:5432/relspec_test
+      run: make test-integration
+
+    - name: Stop PostgreSQL container
+      if: always()
+      run: |
+        docker stop relspec-test-postgres || true
+        docker rm relspec-test-postgres || true
+
+    - name: Summary
+      if: always()
+      run: |
+        echo "Integration tests completed."
+        echo "PostgreSQL container has been cleaned up."

.github/workflows/release.yml

@@ -0,0 +1,116 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+jobs:
+  build-and-release:
+    name: Build and Release
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.25'
+
+    - name: Get version from tag
+      id: get_version
+      run: |
+        echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+        echo "Version: ${GITHUB_REF#refs/tags/}"
+
+    - name: Build binaries for multiple platforms
+      run: |
+        mkdir -p dist
+
+        # Linux AMD64
+        GOOS=linux GOARCH=amd64 go build -o dist/relspec-linux-amd64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+
+        # Linux ARM64
+        GOOS=linux GOARCH=arm64 go build -o dist/relspec-linux-arm64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+
+        # macOS AMD64
+        GOOS=darwin GOARCH=amd64 go build -o dist/relspec-darwin-amd64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+
+        # macOS ARM64 (Apple Silicon)
+        GOOS=darwin GOARCH=arm64 go build -o dist/relspec-darwin-arm64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+
+        # Windows AMD64
+        GOOS=windows GOARCH=amd64 go build -o dist/relspec-windows-amd64.exe -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+
+        # Create checksums
+        cd dist
+        sha256sum * > checksums.txt
+        cd ..
+
+    - name: Generate release notes
+      id: release_notes
+      run: |
+        # Get the previous tag
+        previous_tag=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
+
+        if [ -z "$previous_tag" ]; then
+          # No previous tag, get all commits
+          commits=$(git log --pretty=format:"- %s (%h)" --no-merges)
+        else
+          # Get commits since the previous tag
+          commits=$(git log "${previous_tag}..HEAD" --pretty=format:"- %s (%h)" --no-merges)
+        fi
+
+        # Create release notes
+        cat > release_notes.md << EOF
+        # Release ${{ steps.get_version.outputs.VERSION }}
+
+        ## Changes
+
+        ${commits}
+
+        ## Installation
+
+        Download the appropriate binary for your platform:
+
+        - **Linux (AMD64)**: \`relspec-linux-amd64\`
+        - **Linux (ARM64)**: \`relspec-linux-arm64\`
+        - **macOS (Intel)**: \`relspec-darwin-amd64\`
+        - **macOS (Apple Silicon)**: \`relspec-darwin-arm64\`
+        - **Windows (AMD64)**: \`relspec-windows-amd64.exe\`
+
+        Make the binary executable (Linux/macOS):
+        \`\`\`bash
+        chmod +x relspec-*
+        \`\`\`
+
+        Verify the download with the provided checksums.
+        EOF
+
+    - name: Create Release
+      uses: softprops/action-gh-release@v1
+      with:
+        body_path: release_notes.md
+        files: |
+          dist/relspec-linux-amd64
+          dist/relspec-linux-arm64
+          dist/relspec-darwin-amd64
+          dist/relspec-darwin-arm64
+          dist/relspec-windows-amd64.exe
+          dist/checksums.txt
+        draft: false
+        prerelease: false
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Summary
+      run: |
+        echo "Release ${{ steps.get_version.outputs.VERSION }} created successfully!"
+        echo "Binaries built for:"
+        echo "  - Linux (amd64, arm64)"
+        echo "  - macOS (amd64, arm64)"
+        echo "  - Windows (amd64)"

AI_USE.md

@@ -0,0 +1,35 @@
+# AI Usage Declaration
+
+This Go project utilizes AI tools for the following purposes:
+
+- Generating and improving documentation
+- Writing and enhancing tests
+- Refactoring and optimizing existing code
+
+AI is **not** used for core design or architecture decisions.  
+All design decisions are deferred to human discussion.  
+AI is employed only for enhancements to human-written code.
+
+We are aware of significant AI hallucinations; all AI-generated content is to be reviewed and verified by humans.
+
+
+        .-""""""-.
+      .'          '.
+    /   O      O   \
+    :           `    :
+    |                |
+    :    .------.    :
+    \  '        '  /
+      '.          .'
+        '-......-'
+      MEGAMIND AI
+      [============]
+
+        ___________
+      /___________\ 
+    /_____________\
+    |   ASSIMILATE  |
+    |   RESISTANCE  |
+    |   IS FUTILE   |
+    \_____________/
+      \___________/

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all build test lint coverage clean install help docker-up docker-down docker-test docker-test-integration
+.PHONY: all build test test-unit test-integration lint coverage clean install help docker-up docker-down docker-test docker-test-integration release release-version
 
 # Binary name
 BINARY_NAME=relspec
@@ -22,9 +22,23 @@ build: ## Build the binary
 	$(GOBUILD) -o $(BUILD_DIR)/$(BINARY_NAME) ./cmd/relspec
 	@echo "Build complete: $(BUILD_DIR)/$(BINARY_NAME)"
 
-test: ## Run tests
+test: test-unit ## Run all unit tests (alias for test-unit)
-	@echo "Running tests..."
+
-	$(GOTEST) -v -race -coverprofile=coverage.out ./...
+test-unit: ## Run unit tests (excludes integration tests)
+	@echo "Running unit tests..."
+	$(GOTEST) -v -race -coverprofile=coverage.out -covermode=atomic $$(go list ./... | grep -v '/tests/integration' | grep -v '/tests/assets' | grep -v '/pkg/readers/pgsql')
+
+test-integration: ## Run integration tests (requires RELSPEC_TEST_PG_CONN environment variable)
+	@echo "Running integration tests..."
+	@if [ -z "$$RELSPEC_TEST_PG_CONN" ]; then \
+		echo "Error: RELSPEC_TEST_PG_CONN environment variable is not set"; \
+		echo "Example: export RELSPEC_TEST_PG_CONN='postgres://relspec:relspec_test_password@localhost:5432/relspec_test'"; \
+		exit 1; \
+	fi
+	@echo "Running PostgreSQL reader tests..."
+	$(GOTEST) -v -count=1 ./pkg/readers/pgsql/
+	@echo "Running general integration tests..."
+	$(GOTEST) -v -count=1 ./tests/integration/
 
 coverage: test ## Run tests with coverage report
 	@echo "Generating coverage report..."
@@ -40,6 +54,15 @@ lint: ## Run linter
 		exit 1; \
 	fi
 
+lintfix: ## Run linter
+	@echo "Running linter..."
+	@if command -v golangci-lint > /dev/null; then \
+		golangci-lint run --config=.golangci.json --fix; \
+	else \
+		echo "golangci-lint not installed. Install with: go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest"; \
+		exit 1; \
+	fi
+
 clean: ## Clean build artifacts
 	@echo "Cleaning..."
 	$(GOCLEAN)
@@ -89,5 +112,55 @@ docker-test-integration: docker-up ## Start DB and run integration tests
 		$(GOTEST) -v ./pkg/readers/pgsql/ -count=1 || (make docker-down && exit 1)
 	@make docker-down
 
+release: ## Create and push a new release tag (auto-increments patch version)
+	@echo "Creating new release..."
+	@latest_tag=$$(git describe --tags --abbrev=0 2>/dev/null || echo ""); \
+	if [ -z "$$latest_tag" ]; then \
+		version="v1.0.0"; \
+		echo "No existing tags found. Creating first release: $$version"; \
+		commit_logs=$$(git log --pretty=format:"- %s" --no-merges); \
+	else \
+		echo "Latest tag: $$latest_tag"; \
+		version_number=$${latest_tag#v}; \
+		IFS='.' read -r major minor patch <<< "$$version_number"; \
+		patch=$$((patch + 1)); \
+		version="v$$major.$$minor.$$patch"; \
+		echo "Creating new release: $$version"; \
+		commit_logs=$$(git log "$${latest_tag}..HEAD" --pretty=format:"- %s" --no-merges); \
+	fi; \
+	if [ -z "$$commit_logs" ]; then \
+		tag_message="Release $$version"; \
+	else \
+		tag_message="Release $$version\n\n$$commit_logs"; \
+	fi; \
+	git tag -a "$$version" -m "$$tag_message"; \
+	git push origin "$$version"; \
+	echo "Tag $$version created and pushed to remote repository."
+
+release-version: ## Create and push a release with specific version (use: make release-version VERSION=v1.2.3)
+	@if [ -z "$(VERSION)" ]; then \
+		echo "Error: VERSION is required. Usage: make release-version VERSION=v1.2.3"; \
+		exit 1; \
+	fi
+	@version="$(VERSION)"; \
+	if ! echo "$$version" | grep -q "^v"; then \
+		version="v$$version"; \
+	fi; \
+	echo "Creating release: $$version"; \
+	latest_tag=$$(git describe --tags --abbrev=0 2>/dev/null || echo ""); \
+	if [ -z "$$latest_tag" ]; then \
+		commit_logs=$$(git log --pretty=format:"- %s" --no-merges); \
+	else \
+		commit_logs=$$(git log "$${latest_tag}..HEAD" --pretty=format:"- %s" --no-merges); \
+	fi; \
+	if [ -z "$$commit_logs" ]; then \
+		tag_message="Release $$version"; \
+	else \
+		tag_message="Release $$version\n\n$$commit_logs"; \
+	fi; \
+	git tag -a "$$version" -m "$$tag_message"; \
+	git push origin "$$version"; \
+	echo "Tag $$version created and pushed to remote repository."
+
 help: ## Display this help screen
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'

README.md

@@ -6,34 +6,70 @@ RelSpec is a comprehensive database relations management tool that reads, transf
 
 ## Overview
 
-RelSpec provides bidirectional conversion between various database specification formats, allowing you to:
+RelSpec provides bidirectional conversion and comparison between various database specification formats, allowing you to:
 - Inspect live databases and extract their structure
-- Convert between different ORM models (GORM, Bun)
+- Convert between different ORM models (GORM, Bun , etc.)
-- Transform legacy schema definitions (Clarion DCTX, XML, JSON)
+- Transform legacy schema definitions (Clarion DCTX, XML, JSON, etc.)
-- Generate standardized specification files (JSON, YAML)
+- Generate standardized specification files (JSON, YAML, etc.)
 
-![1.00](./assets/image/relspec1.jpg)
+![1.00](./assets/image/relspec1_512.jpg)
 
 ## Features
 
-### Input Formats
+### Readers (Input Formats)
-- **XML** - Generic XML schema definitions
-- **JSON** - JSON-based schema specifications
-- **Clarion DCTX** - Clarion database dictionary format
-- **Database Inspection** - Direct database introspection
-- **GORM Models** - Read existing GORM Go structs
-- **Bun Models** - Read existing Bun Go structs
 
-### Output Formats
+RelSpec can read database schemas from multiple sources:
-- **GORM Models** - Generate GORM-compatible Go structs
+
-- **Bun Models** - Generate Bun-compatible Go structs
+#### ORM Models
-- **JSON** - Standard JSON schema output
+- [GORM](pkg/readers/gorm/README.md) - Go GORM model definitions
-- **YAML** - Human-readable YAML format
+- [Bun](pkg/readers/bun/README.md) - Go Bun model definitions
+- [Drizzle](pkg/readers/drizzle/README.md) - TypeScript Drizzle ORM schemas
+- [Prisma](pkg/readers/prisma/README.md) - Prisma schema language
+- [TypeORM](pkg/readers/typeorm/README.md) - TypeScript TypeORM entities
+
+#### Database Inspection
+- [PostgreSQL](pkg/readers/pgsql/README.md) - Direct PostgreSQL database introspection
+
+#### Schema Formats
+- [DBML](pkg/readers/dbml/README.md) - Database Markup Language (dbdiagram.io)
+- [DCTX](pkg/readers/dctx/README.md) - Clarion database dictionary format
+- [DrawDB](pkg/readers/drawdb/README.md) - DrawDB JSON format
+- [GraphQL](pkg/readers/graphql/README.md) - GraphQL Schema Definition Language (SDL)
+- [JSON](pkg/readers/json/README.md) - RelSpec canonical JSON format
+- [YAML](pkg/readers/yaml/README.md) - RelSpec canonical YAML format
+
+### Writers (Output Formats)
+
+RelSpec can write database schemas to multiple formats:
+
+#### ORM Models
+- [GORM](pkg/writers/gorm/README.md) - Generate GORM-compatible Go structs
+- [Bun](pkg/writers/bun/README.md) - Generate Bun-compatible Go structs
+- [Drizzle](pkg/writers/drizzle/README.md) - Generate Drizzle ORM TypeScript schemas
+- [Prisma](pkg/writers/prisma/README.md) - Generate Prisma schema files
+- [TypeORM](pkg/writers/typeorm/README.md) - Generate TypeORM TypeScript entities
+
+#### Database DDL
+- [PostgreSQL](pkg/writers/pgsql/README.md) - PostgreSQL DDL (CREATE TABLE, etc.)
+
+#### Schema Formats
+- [DBML](pkg/writers/dbml/README.md) - Database Markup Language
+- [DCTX](pkg/writers/dctx/README.md) - Clarion database dictionary format
+- [DrawDB](pkg/writers/drawdb/README.md) - DrawDB JSON format
+- [GraphQL](pkg/writers/graphql/README.md) - GraphQL Schema Definition Language (SDL)
+- [JSON](pkg/writers/json/README.md) - RelSpec canonical JSON format
+- [YAML](pkg/writers/yaml/README.md) - RelSpec canonical YAML format
+
+
+## Use of AI
+[Rules and use of AI](./AI_USE.md)
 
 ## Installation
 
 ```bash
 go get github.com/wdevs/relspecgo
+
+go install -v git.warky.dev/wdevs/relspecgo/cmd/relspec@latest
 ```
 
 ## Usage
@@ -66,6 +102,10 @@ relspecgo/
 └── tests/            # Test files
 ```
 
+## Todo
+
+[Todo List of Features](./TODO.md)
+
 ## Development
 
 ### Prerequisites
@@ -88,7 +128,7 @@ go test ./...
 
 Apache License 2.0 - See [LICENSE](LICENSE) for details.
 
-Copyright 2025 wdevs
+Copyright 2025 Warky Devs
 
 ## Contributing
 

TODO.md

@@ -1,110 +1,46 @@
 # RelSpec - TODO List
 
 
-
+## Input Readers / Writers
-
+- [✔️] **Database Inspector**
-## Input Readers
+  - [✔️] PostgreSQL driver
-- [ ] **Database Inspector**
-  - [ ] PostgreSQL driver
   - [ ] MySQL driver
   - [ ] SQLite driver
   - [ ] MSSQL driver
-  - [ ] Foreign key detection
+  - [✔️] Foreign key detection
-  - [ ] Index extraction
+  - [✔️] Index extraction
+  - [*] .sql file generation with sequence and priority
+- [✔️] .dbml: Database Markup Language (DBML) for textual schema representation.
+- [✔️] Prisma schema support (PSL format) .prisma
+- [✔️] Drizzle ORM support .ts (TypeScript / JavaScript)  (Mr. Edd wanted to move from Prisma to Drizzle. If you are bugs, you are welcome to do pull requests or issues)
+- [☠️] Entity Framework (.NET) model .edmx  (Fuck no, EDMX files were bloated, verbose XML nightmares—hard to merge, error-prone, and a pain in teams. Microsoft wisely ditched them in EF Core for code-first. Classic overkill from old MS era.)
+- [✔️] TypeORM support
+- [] .hbm.xml / schema.xml: Hibernate/Propel mappings (Java/PHP)  (💲 Someone can do this, not me)
+- [ ] Django models.py (Python classes), Sequelize migrations (JS) (💲 Someone can do this, not me)
+- [] .avsc: Avro schema (JSON format for data serialization) (💲 Someone can do this, not me)
+- [✔️] GraphQL schema generation
 
-- [ ] **XML Reader**
-  - [ ] XML schema parser
-  - [ ] Validation against XSD
-
-- [ ] **JSON Reader**
-  - [ ] JSON schema parser
-  - [ ] Schema validation
-
-- [ ] **Clarion DCTX Reader**
-  - [ ] DCTX file parser
-  - [ ] Legacy format support
-
-- [ ] **GORM Model Reader**
-  - [ ] Go AST parser for GORM tags
-  - [ ] Struct field analysis
-  - [ ] Relation tag extraction
-
-- [ ] **Bun Model Reader**
-  - [ ] Go AST parser for Bun tags
-  - [ ] Struct field analysis
-  - [ ] Relation tag extraction
-
-## Output Writers
-- [ ] **GORM Writer**
-  - [ ] Go struct generation
-  - [ ] GORM tag formatting
-  - [ ] Relation definitions
-  - [ ] gofmt integration
-
-- [ ] **Bun Writer**
-  - [ ] Go struct generation
-  - [ ] Bun tag formatting
-  - [ ] Relation definitions
-  - [ ] gofmt integration
-
-- [ ] **JSON Writer**
-  - [ ] Schema serialization
-  - [ ] Pretty printing
-
-- [ ] **YAML Writer**
-  - [ ] Schema serialization
-  - [ ] Comment preservation
-
-## CLI Application
-- [ ] Command-line interface using cobra
-- [ ] Input format flags
-- [ ] Output format flags
-- [ ] Connection string handling
-- [ ] File I/O operations
-- [ ] Progress indicators
-- [ ] Error handling and reporting
-- [ ] Configuration file support
-
-## Testing
-- [ ] Unit tests for each reader
-- [ ] Unit tests for each writer
-- [ ] Integration tests for conversion pipelines
-- [ ] Test fixtures for all formats
-- [ ] Database test containers
-- [ ] Benchmark tests for large schemas
 
 ## Documentation
 - [ ] API documentation (godoc)
 - [ ] Usage examples for each format combination
-- [ ] Migration guides
-- [ ] Architecture documentation
-- [ ] Contributing guidelines
 
 ## Advanced Features
 - [ ] Dry-run mode for validation
-- [ ] Diff tool for comparing specifications
+- [x] Diff tool for comparing specifications
 - [ ] Migration script generation
 - [ ] Custom type mapping configuration
 - [ ] Batch processing support
 - [ ] Watch mode for auto-regeneration
 
+## Future Considerations
+- [ ] Web UI for visual editing
+- [ ] REST API server mode
+- [ ] Support for NoSQL databases
+
+
 ## Performance
 - [ ] Concurrent processing for multiple tables
 - [ ] Streaming for large databases
 - [ ] Memory optimization
 - [ ] Caching layer for repeated operations
-
-## Quality & Maintenance
-- [ ] Linting with golangci-lint
-- [ ] Code coverage > 80%
-- [ ] Security scanning
-- [ ] Dependency updates automation
-- [ ] Release automation
-
-## Future Considerations
-- [ ] Web UI for visual editing
-- [ ] REST API server mode
-- [ ] Support for NoSQL databases
-- [ ] GraphQL schema generation
-- [ ] Prisma schema support
-- [ ] TypeORM support

cmd/relspec/convert.go

@@ -6,26 +6,35 @@ import (
 	"strings"
 	"time"
 
+	"github.com/spf13/cobra"
+
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/bun"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/dbml"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/dctx"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/drawdb"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/drizzle"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/gorm"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/graphql"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/json"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/prisma"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/typeorm"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 	wbun "git.warky.dev/wdevs/relspecgo/pkg/writers/bun"
 	wdbml "git.warky.dev/wdevs/relspecgo/pkg/writers/dbml"
 	wdctx "git.warky.dev/wdevs/relspecgo/pkg/writers/dctx"
 	wdrawdb "git.warky.dev/wdevs/relspecgo/pkg/writers/drawdb"
+	wdrizzle "git.warky.dev/wdevs/relspecgo/pkg/writers/drizzle"
 	wgorm "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
+	wgraphql "git.warky.dev/wdevs/relspecgo/pkg/writers/graphql"
 	wjson "git.warky.dev/wdevs/relspecgo/pkg/writers/json"
 	wpgsql "git.warky.dev/wdevs/relspecgo/pkg/writers/pgsql"
+	wprisma "git.warky.dev/wdevs/relspecgo/pkg/writers/prisma"
+	wtypeorm "git.warky.dev/wdevs/relspecgo/pkg/writers/typeorm"
 	wyaml "git.warky.dev/wdevs/relspecgo/pkg/writers/yaml"
-	"github.com/spf13/cobra"
 )
 
 var (
@@ -51,20 +60,28 @@ Input formats:
   - dbml: DBML schema files
   - dctx: DCTX schema files
   - drawdb: DrawDB JSON files
+  - graphql: GraphQL schema files (.graphql, SDL)
   - json: JSON database schema
   - yaml: YAML database schema
   - gorm: GORM model files (Go, file or directory)
   - bun: Bun model files (Go, file or directory)
+  - drizzle: Drizzle ORM schema files (TypeScript, file or directory)
+  - prisma: Prisma schema files (.prisma)
+  - typeorm: TypeORM entity files (TypeScript)
   - pgsql: PostgreSQL database (live connection)
 
 Output formats:
   - dbml: DBML schema files
   - dctx: DCTX schema files
   - drawdb: DrawDB JSON files
+  - graphql: GraphQL schema files (.graphql, SDL)
   - json: JSON database schema
   - yaml: YAML database schema
   - gorm: GORM model files (Go)
   - bun: Bun model files (Go)
+  - drizzle: Drizzle ORM schema files (TypeScript)
+  - prisma: Prisma schema files (.prisma)
+  - typeorm: TypeORM entity files (TypeScript)
   - pgsql: PostgreSQL SQL schema
 
 PostgreSQL Connection String Examples:
@@ -123,18 +140,27 @@ Examples:
 }
 
 func init() {
-	convertCmd.Flags().StringVar(&convertSourceType, "from", "", "Source format (dbml, dctx, drawdb, json, yaml, gorm, bun, pgsql)")
+	convertCmd.Flags().StringVar(&convertSourceType, "from", "", "Source format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql)")
 	convertCmd.Flags().StringVar(&convertSourcePath, "from-path", "", "Source file path (for file-based formats)")
 	convertCmd.Flags().StringVar(&convertSourceConn, "from-conn", "", "Source connection string (for database formats)")
 
-	convertCmd.Flags().StringVar(&convertTargetType, "to", "", "Target format (dbml, dctx, drawdb, json, yaml, gorm, bun, pgsql)")
+	convertCmd.Flags().StringVar(&convertTargetType, "to", "", "Target format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql)")
 	convertCmd.Flags().StringVar(&convertTargetPath, "to-path", "", "Target output path (file or directory)")
 	convertCmd.Flags().StringVar(&convertPackageName, "package", "", "Package name (for code generation formats like gorm/bun)")
 	convertCmd.Flags().StringVar(&convertSchemaFilter, "schema", "", "Filter to a specific schema by name (required for formats like dctx that only support single schemas)")
 
-	convertCmd.MarkFlagRequired("from")
+	err := convertCmd.MarkFlagRequired("from")
-	convertCmd.MarkFlagRequired("to")
+	if err != nil {
-	convertCmd.MarkFlagRequired("to-path")
+		fmt.Fprintf(os.Stderr, "Error marking from flag as required: %v\n", err)
+	}
+	err = convertCmd.MarkFlagRequired("to")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error marking to flag as required: %v\n", err)
+	}
+	err = convertCmd.MarkFlagRequired("to-path")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error marking to-path flag as required: %v\n", err)
+	}
 }
 
 func runConvert(cmd *cobra.Command, args []string) error {
@@ -239,6 +265,30 @@ func readDatabaseForConvert(dbType, filePath, connString string) (*models.Databa
 		}
 		reader = bun.NewReader(&readers.ReaderOptions{FilePath: filePath})
 
+	case "drizzle":
+		if filePath == "" {
+			return nil, fmt.Errorf("file path is required for Drizzle format")
+		}
+		reader = drizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+
+	case "prisma":
+		if filePath == "" {
+			return nil, fmt.Errorf("file path is required for Prisma format")
+		}
+		reader = prisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+
+	case "typeorm":
+		if filePath == "" {
+			return nil, fmt.Errorf("file path is required for TypeORM format")
+		}
+		reader = typeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+
+	case "graphql", "gql":
+		if filePath == "" {
+			return nil, fmt.Errorf("file path is required for GraphQL format")
+		}
+		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+
 	default:
 		return nil, fmt.Errorf("unsupported source format: %s", dbType)
 	}
@@ -287,9 +337,21 @@ func writeDatabase(db *models.Database, dbType, outputPath, packageName, schemaF
 		}
 		writer = wbun.NewWriter(writerOpts)
 
+	case "drizzle":
+		writer = wdrizzle.NewWriter(writerOpts)
+
 	case "pgsql", "postgres", "postgresql", "sql":
 		writer = wpgsql.NewWriter(writerOpts)
 
+	case "prisma":
+		writer = wprisma.NewWriter(writerOpts)
+
+	case "typeorm":
+		writer = wtypeorm.NewWriter(writerOpts)
+
+	case "graphql", "gql":
+		writer = wgraphql.NewWriter(writerOpts)
+
 	default:
 		return fmt.Errorf("unsupported target format: %s", dbType)
 	}
@@ -318,7 +380,7 @@ func writeDatabase(db *models.Database, dbType, outputPath, packageName, schemaF
 	}
 
 	// For formats like DCTX that don't support full database writes, require schema filter
-	if strings.ToLower(dbType) == "dctx" {
+	if strings.EqualFold(dbType, "dctx") {
 		if len(db.Schemas) == 0 {
 			return fmt.Errorf("no schemas found in database")
 		}

cmd/relspec/diff.go

@@ -6,6 +6,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/spf13/cobra"
+
 	"git.warky.dev/wdevs/relspecgo/pkg/diff"
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers"
@@ -15,7 +17,6 @@ import (
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/json"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
-	"github.com/spf13/cobra"
 )
 
 var (
@@ -96,8 +97,14 @@ func init() {
 	diffCmd.Flags().StringVar(&outputFormat, "format", "summary", "Output format (summary, json, html)")
 	diffCmd.Flags().StringVar(&outputPath, "output", "", "Output file path (default: stdout for summary, required for json/html)")
 
-	diffCmd.MarkFlagRequired("from")
+	err := diffCmd.MarkFlagRequired("from")
-	diffCmd.MarkFlagRequired("to")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error marking from flag as required: %v\n", err)
+	}
+	err = diffCmd.MarkFlagRequired("to")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error marking to flag as required: %v\n", err)
+	}
 }
 
 func runDiff(cmd *cobra.Command, args []string) error {

go.mod

@@ -1,193 +1,31 @@
 module git.warky.dev/wdevs/relspecgo
 
-go 1.25.5
+go 1.24.0
 
 require (
-	4d63.com/gocheckcompilerdirectives v1.3.0 // indirect
+	github.com/google/uuid v1.6.0
-	4d63.com/gochecknoglobals v0.2.2 // indirect
+	github.com/jackc/pgx/v5 v5.7.6
-	github.com/4meepo/tagalign v1.4.2 // indirect
+	github.com/spf13/cobra v1.10.2
-	github.com/Abirdcfly/dupword v0.1.3 // indirect
+	github.com/stretchr/testify v1.11.1
-	github.com/Antonboom/errname v1.0.0 // indirect
+	github.com/uptrace/bun v1.2.16
-	github.com/Antonboom/nilnil v1.0.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1
-	github.com/Antonboom/testifylint v1.5.2 // indirect
+)
-	github.com/BurntSushi/toml v1.4.1-0.20240526193622-a339e1f7089c // indirect
-	github.com/Crocmagnon/fatcontext v0.7.1 // indirect
-	github.com/Djarvur/go-err113 v0.0.0-20210108212216-aea10b59be24 // indirect
-	github.com/GaijinEntertainment/go-exhaustruct/v3 v3.3.1 // indirect
-	github.com/Masterminds/semver/v3 v3.3.0 // indirect
-	github.com/OpenPeeDeeP/depguard/v2 v2.2.1 // indirect
-	github.com/alecthomas/go-check-sumtype v0.3.1 // indirect
-	github.com/alexkohler/nakedret/v2 v2.0.5 // indirect
-	github.com/alexkohler/prealloc v1.0.0 // indirect
-	github.com/alingse/asasalint v0.0.11 // indirect
-	github.com/alingse/nilnesserr v0.1.2 // indirect
-	github.com/ashanbrown/forbidigo v1.6.0 // indirect
-	github.com/ashanbrown/makezero v1.2.0 // indirect
-	github.com/beorn7/perks v1.0.1 // indirect
 
-	github.com/bkielbasa/cyclop v1.2.3 // indirect
+require (
-	github.com/blizzy78/varnamelen v0.8.0 // indirect
-	github.com/bombsimon/wsl/v4 v4.5.0 // indirect
-	github.com/breml/bidichk v0.3.2 // indirect
-	github.com/breml/errchkjson v0.4.0 // indirect
-	github.com/butuzov/ireturn v0.3.1 // indirect
-	github.com/butuzov/mirror v1.3.0 // indirect
-	github.com/catenacyber/perfsprint v0.8.2 // indirect
-	github.com/ccojocar/zxcvbn-go v1.0.2 // indirect
-	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/charithe/durationcheck v0.0.10 // indirect
-	github.com/chavacava/garif v0.1.0 // indirect
-	github.com/ckaznocha/intrange v0.3.0 // indirect
-	github.com/curioswitch/go-reassign v0.3.0 // indirect
-	github.com/daixiang0/gci v0.13.5 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/denis-tingaikin/go-header v0.5.0 // indirect
-	github.com/ettle/strcase v0.2.0 // indirect
-	github.com/fatih/color v1.18.0 // indirect
-	github.com/fatih/structtag v1.2.0 // indirect
-	github.com/firefart/nonamedreturns v1.0.5 // indirect
-	github.com/fsnotify/fsnotify v1.9.0 // indirect
-	github.com/fzipp/gocyclo v0.6.0 // indirect
-	github.com/ghostiam/protogetter v0.3.9 // indirect
-	github.com/go-critic/go-critic v0.12.0 // indirect
-	github.com/go-toolsmith/astcast v1.1.0 // indirect
-	github.com/go-toolsmith/astcopy v1.1.0 // indirect
-	github.com/go-toolsmith/astequal v1.2.0 // indirect
-	github.com/go-toolsmith/astfmt v1.1.0 // indirect
-	github.com/go-toolsmith/astp v1.1.0 // indirect
-	github.com/go-toolsmith/strparse v1.1.0 // indirect
-	github.com/go-toolsmith/typep v1.1.0 // indirect
-	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
-	github.com/go-xmlfmt/xmlfmt v1.1.3 // indirect
-	github.com/gobwas/glob v0.2.3 // indirect
-	github.com/gofrs/flock v0.12.1 // indirect
-	github.com/golangci/dupl v0.0.0-20250308024227-f665c8d69b32 // indirect
-	github.com/golangci/go-printf-func-name v0.1.0 // indirect
-	github.com/golangci/gofmt v0.0.0-20250106114630-d62b90e6713d // indirect
-	github.com/golangci/golangci-lint v1.64.8 // indirect
-	github.com/golangci/misspell v0.6.0 // indirect
-	github.com/golangci/plugin-module-register v0.1.1 // indirect
-	github.com/golangci/revgrep v0.8.0 // indirect
-	github.com/golangci/unconvert v0.0.0-20240309020433-c5143eacb3ed // indirect
-	github.com/google/go-cmp v0.7.0 // indirect
-	github.com/google/uuid v1.6.0 // indirect
-	github.com/gordonklaus/ineffassign v0.1.0 // indirect
-	github.com/gostaticanalysis/analysisutil v0.7.1 // indirect
-	github.com/gostaticanalysis/comment v1.5.0 // indirect
-	github.com/gostaticanalysis/forcetypeassert v0.2.0 // indirect
-	github.com/gostaticanalysis/nilerr v0.1.1 // indirect
-	github.com/hashicorp/go-immutable-radix/v2 v2.1.0 // indirect
-	github.com/hashicorp/go-version v1.7.0 // indirect
-	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
-	github.com/hexops/gotextdiff v1.0.3 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx/v5 v5.7.6 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
-	github.com/jgautheron/goconst v1.7.1 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
-	github.com/jingyugao/rowserrcheck v1.1.1 // indirect
-	github.com/jjti/go-spancheck v0.6.4 // indirect
-	github.com/julz/importas v0.2.0 // indirect
-	github.com/karamaru-alpha/copyloopvar v1.2.1 // indirect
-	github.com/kisielk/errcheck v1.9.0 // indirect
-	github.com/kkHAIKE/contextcheck v1.1.6 // indirect
-	github.com/kulti/thelper v0.6.3 // indirect
-	github.com/kunwardeep/paralleltest v1.0.10 // indirect
-	github.com/lasiar/canonicalheader v1.1.2 // indirect
-	github.com/ldez/exptostd v0.4.2 // indirect
-	github.com/ldez/gomoddirectives v0.6.1 // indirect
-	github.com/ldez/grignotin v0.9.0 // indirect
-	github.com/ldez/tagliatelle v0.7.1 // indirect
-	github.com/ldez/usetesting v0.4.2 // indirect
-	github.com/leonklingele/grouper v1.1.2 // indirect
-	github.com/macabu/inamedparam v0.1.3 // indirect
-	github.com/maratori/testableexamples v1.0.0 // indirect
-	github.com/maratori/testpackage v1.1.1 // indirect
-	github.com/matoous/godox v1.1.0 // indirect
-	github.com/mattn/go-colorable v0.1.14 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/mattn/go-runewidth v0.0.16 // indirect
-	github.com/mgechev/revive v1.7.0 // indirect
-	github.com/mitchellh/go-homedir v1.1.0 // indirect
-	github.com/moricho/tparallel v0.3.2 // indirect
-	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/nakabonne/nestif v0.3.1 // indirect
-	github.com/nishanths/exhaustive v0.12.0 // indirect
-	github.com/nishanths/predeclared v0.2.2 // indirect
-	github.com/nunnatsa/ginkgolinter v0.19.1 // indirect
-	github.com/olekukonko/tablewriter v0.0.5 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/polyfloyd/go-errorlint v1.7.1 // indirect
+	github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect
-	github.com/prometheus/client_golang v1.23.2 // indirect
-	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/common v0.66.1 // indirect
-	github.com/prometheus/procfs v0.16.1 // indirect
-	github.com/quasilyte/go-ruleguard v0.4.3-0.20240823090925-0fe6f58b47b1 // indirect
-	github.com/quasilyte/go-ruleguard/dsl v0.3.22 // indirect
-	github.com/quasilyte/gogrep v0.5.0 // indirect
-	github.com/quasilyte/regex/syntax v0.0.0-20210819130434-b3f0c404a727 // indirect
-	github.com/quasilyte/stdinfo v0.0.0-20220114132959-f7386bf02567 // indirect
-	github.com/raeperd/recvcheck v0.2.0 // indirect
-	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
-	github.com/ryancurrah/gomodguard v1.3.5 // indirect
-	github.com/ryanrolds/sqlclosecheck v0.5.1 // indirect
-	github.com/sagikazarmark/locafero v0.11.0 // indirect
-	github.com/sanposhiho/wastedassign/v2 v2.1.0 // indirect
-	github.com/santhosh-tekuri/jsonschema/v6 v6.0.1 // indirect
-	github.com/sashamelentyev/interfacebloat v1.1.0 // indirect
-	github.com/sashamelentyev/usestdlibvars v1.28.0 // indirect
-	github.com/securego/gosec/v2 v2.22.2 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	github.com/sivchari/containedctx v1.0.3 // indirect
-	github.com/sivchari/tenv v1.12.1 // indirect
-	github.com/sonatard/noctx v0.1.0 // indirect
-	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
-	github.com/sourcegraph/go-diff v0.7.0 // indirect
-	github.com/spf13/afero v1.15.0 // indirect
-	github.com/spf13/cast v1.10.0 // indirect
-	github.com/spf13/cobra v1.10.2 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
-	github.com/spf13/viper v1.21.0 // indirect
+	github.com/tmthrgd/go-hex v0.0.0-20190904060850-447a3041c3bc // indirect
-	github.com/ssgreg/nlreturn/v2 v2.2.1 // indirect
+	github.com/vmihailenco/msgpack/v5 v5.4.1 // indirect
-	github.com/stbenjam/no-sprintf-host-port v0.2.0 // indirect
+	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
-	github.com/stretchr/objx v0.5.2 // indirect
-	github.com/stretchr/testify v1.11.1 // indirect
-	github.com/subosito/gotenv v1.6.0 // indirect
-	github.com/tdakkota/asciicheck v0.4.1 // indirect
-	github.com/tetafro/godot v1.5.0 // indirect
-	github.com/timakin/bodyclose v0.0.0-20241017074812-ed6a65f985e3 // indirect
-	github.com/timonwong/loggercheck v0.10.1 // indirect
-	github.com/tomarrell/wrapcheck/v2 v2.10.0 // indirect
-	github.com/tommy-muehle/go-mnd/v2 v2.5.1 // indirect
-	github.com/ultraware/funlen v0.2.0 // indirect
-	github.com/ultraware/whitespace v0.2.0 // indirect
-	github.com/uudashr/gocognit v1.2.0 // indirect
-	github.com/uudashr/iface v1.3.1 // indirect
-	github.com/xen0n/gosmopolitan v1.2.2 // indirect
-	github.com/yagipy/maintidx v1.0.0 // indirect
-	github.com/yeya24/promlinter v0.3.0 // indirect
-	github.com/ykadowak/zerologlint v0.1.5 // indirect
-	gitlab.com/bosi/decorder v0.4.2 // indirect
-	go-simpler.org/musttag v0.13.0 // indirect
-	go-simpler.org/sloglint v0.9.0 // indirect
-	go.uber.org/automaxprocs v1.6.0 // indirect
-	go.uber.org/multierr v1.10.0 // indirect
-	go.uber.org/zap v1.27.0 // indirect
-	go.yaml.in/yaml/v2 v2.4.2 // indirect
-	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/crypto v0.41.0 // indirect
-	golang.org/x/exp/typeparams v0.0.0-20250210185358-939b2ce775ac // indirect
+	golang.org/x/sys v0.38.0 // indirect
-	golang.org/x/mod v0.26.0 // indirect
-	golang.org/x/sync v0.16.0 // indirect
-	golang.org/x/sys v0.35.0 // indirect
 	golang.org/x/text v0.28.0 // indirect
-	golang.org/x/tools v0.35.0 // indirect
-	google.golang.org/protobuf v1.36.8 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
-	honnef.co/go/tools v0.6.1 // indirect
-	mvdan.cc/gofumpt v0.7.0 // indirect
-	mvdan.cc/unparam v0.0.0-20240528143540-8a5130ca722f // indirect
 )

go.sum

@@ -1,171 +1,10 @@
-4d63.com/gocheckcompilerdirectives v1.3.0 h1:Ew5y5CtcAAQeTVKUVFrE7EwHMrTO6BggtEj8BZSjZ3A=
-4d63.com/gocheckcompilerdirectives v1.3.0/go.mod h1:ofsJ4zx2QAuIP/NO/NAh1ig6R1Fb18/GI7RVMwz7kAY=
-4d63.com/gochecknoglobals v0.2.2 h1:H1vdnwnMaZdQW/N+NrkT1SZMTBmcwHe9Vq8lJcYYTtU=
-4d63.com/gochecknoglobals v0.2.2/go.mod h1:lLxwTQjL5eIesRbvnzIP3jZtG140FnTdz+AlMa+ogt0=
-github.com/4meepo/tagalign v1.4.2 h1:0hcLHPGMjDyM1gHG58cS73aQF8J4TdVR96TZViorO9E=
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-google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.6.1 h1:R094WgE8K4JirYjBaOpz/AvTyUu/3wbmAoskKN/pxTI=
-honnef.co/go/tools v0.6.1/go.mod h1:3puzxxljPCe8RGJX7BIy1plGbxEOZni5mR2aXe3/uk4=
-mvdan.cc/gofumpt v0.7.0 h1:bg91ttqXmi9y2xawvkuMXyvAA/1ZGJqYAEGjXuP0JXU=
-mvdan.cc/gofumpt v0.7.0/go.mod h1:txVFJy/Sc/mvaycET54pV8SW8gWxTlUuGHVEcncmNUo=
-mvdan.cc/unparam v0.0.0-20240528143540-8a5130ca722f h1:lMpcwN6GxNbWtbpI1+xzFLSW8XzX0u72NttUGVFjO3U=
-mvdan.cc/unparam v0.0.0-20240528143540-8a5130ca722f/go.mod h1:RSLa7mKKCNeTTMHBw5Hsy2rfJmd6O2ivt9Dw9ZqCQpQ=

make_release.sh

@@ -1,71 +0,0 @@
-#!/bin/bash
-
-# Ask if the user wants to make a release version
-read -p "Do you want to make a release version? (y/n): " make_release
-
-if [[ $make_release =~ ^[Yy]$ ]]; then
-    # Get the latest tag from git
-    latest_tag=$(git describe --tags --abbrev=0 2>/dev/null)
-
-    if [ -z "$latest_tag" ]; then
-        # No tags exist yet, start with v1.0.0
-        suggested_version="v1.0.0"
-        echo "No existing tags found. Starting with $suggested_version"
-    else
-        echo "Latest tag: $latest_tag"
-
-        # Remove 'v' prefix if present
-        version_number="${latest_tag#v}"
-
-        # Split version into major.minor.patch
-        IFS='.' read -r major minor patch <<< "$version_number"
-
-        # Increment patch version
-        patch=$((patch + 1))
-
-        # Construct new version
-        suggested_version="v${major}.${minor}.${patch}"
-        echo "Suggested next version: $suggested_version"
-    fi
-
-    # Ask the user for the version number with the suggested version as default
-    read -p "Enter the version number (press Enter for $suggested_version): " version
-
-    # Use suggested version if user pressed Enter without input
-    if [ -z "$version" ]; then
-        version="$suggested_version"
-    fi
-
-    # Prepend 'v' to the version if it doesn't start with it
-    if ! [[ $version =~ ^v ]]; then
-        version="v$version"
-    fi
-
-    # Get commit logs since the last tag
-    if [ -z "$latest_tag" ]; then
-        # No previous tag, get all commits
-        commit_logs=$(git log --pretty=format:"- %s" --no-merges)
-    else
-        # Get commits since the last tag
-        commit_logs=$(git log "${latest_tag}..HEAD" --pretty=format:"- %s" --no-merges)
-    fi
-
-    # Create the tag message
-    if [ -z "$commit_logs" ]; then
-        tag_message="Release $version"
-    else
-        tag_message="Release $version
-
-${commit_logs}"
-    fi
-
-    # Create an annotated tag with the commit logs
-    git tag -a "$version" -m "$tag_message"
-
-    # Push the tag to the remote repository
-    git push origin "$version"
-
-    echo "Tag $version created and pushed to the remote repository."
-else
-    echo "No release version created."
-fi

pkg/diff/diff.go

@@ -2,14 +2,15 @@ package diff
 
 import (
 	"reflect"
+
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 )
 
 // CompareDatabases compares two database models and returns the differences
 func CompareDatabases(source, target *models.Database) *DiffResult {
 	result := &DiffResult{
-		Source: source.Name,
+		Source:  source.Name,
-		Target: target.Name,
+		Target:  target.Name,
 		Schemas: compareSchemas(source.Schemas, target.Schemas),
 	}
 	return result

pkg/diff/types.go

@@ -4,8 +4,8 @@ import "git.warky.dev/wdevs/relspecgo/pkg/models"
 
 // DiffResult represents the complete difference analysis between two databases
 type DiffResult struct {
-	Source string       `json:"source"`
+	Source  string      `json:"source"`
-	Target string       `json:"target"`
+	Target  string      `json:"target"`
 	Schemas *SchemaDiff `json:"schemas"`
 }
 
@@ -18,17 +18,17 @@ type SchemaDiff struct {
 
 // SchemaChange represents changes within a schema
 type SchemaChange struct {
-	Name      string         `json:"name"`
+	Name      string        `json:"name"`
-	Tables    *TableDiff     `json:"tables,omitempty"`
+	Tables    *TableDiff    `json:"tables,omitempty"`
-	Views     *ViewDiff      `json:"views,omitempty"`
+	Views     *ViewDiff     `json:"views,omitempty"`
-	Sequences *SequenceDiff  `json:"sequences,omitempty"`
+	Sequences *SequenceDiff `json:"sequences,omitempty"`
 }
 
 // TableDiff represents differences in tables
 type TableDiff struct {
-	Missing  []*models.Table  `json:"missing"`  // Tables in source but not in target
+	Missing  []*models.Table `json:"missing"`  // Tables in source but not in target
-	Extra    []*models.Table  `json:"extra"`    // Tables in target but not in source
+	Extra    []*models.Table `json:"extra"`    // Tables in target but not in source
-	Modified []*TableChange   `json:"modified"` // Tables that exist in both but differ
+	Modified []*TableChange  `json:"modified"` // Tables that exist in both but differ
 }
 
 // TableChange represents changes within a table
@@ -50,16 +50,16 @@ type ColumnDiff struct {
 
 // ColumnChange represents a modified column
 type ColumnChange struct {
-	Name   string            `json:"name"`
+	Name    string         `json:"name"`
-	Source *models.Column    `json:"source"`
+	Source  *models.Column `json:"source"`
-	Target *models.Column    `json:"target"`
+	Target  *models.Column `json:"target"`
-	Changes map[string]any    `json:"changes"` // Map of field name to what changed
+	Changes map[string]any `json:"changes"` // Map of field name to what changed
 }
 
 // IndexDiff represents differences in indexes
 type IndexDiff struct {
-	Missing  []*models.Index `json:"missing"` // Indexes in source but not in target
+	Missing  []*models.Index `json:"missing"`  // Indexes in source but not in target
-	Extra    []*models.Index `json:"extra"`   // Indexes in target but not in source
+	Extra    []*models.Index `json:"extra"`    // Indexes in target but not in source
 	Modified []*IndexChange  `json:"modified"` // Indexes that exist in both but differ
 }
 
@@ -103,8 +103,8 @@ type RelationshipChange struct {
 
 // ViewDiff represents differences in views
 type ViewDiff struct {
-	Missing  []*models.View `json:"missing"` // Views in source but not in target
+	Missing  []*models.View `json:"missing"`  // Views in source but not in target
-	Extra    []*models.View `json:"extra"`   // Views in target but not in source
+	Extra    []*models.View `json:"extra"`    // Views in target but not in source
 	Modified []*ViewChange  `json:"modified"` // Views that exist in both but differ
 }
 
@@ -133,14 +133,14 @@ type SequenceChange struct {
 
 // Summary provides counts for quick overview
 type Summary struct {
-	Schemas      SchemaSummary      `json:"schemas"`
+	Schemas       SchemaSummary       `json:"schemas"`
-	Tables       TableSummary       `json:"tables"`
+	Tables        TableSummary        `json:"tables"`
-	Columns      ColumnSummary      `json:"columns"`
+	Columns       ColumnSummary       `json:"columns"`
-	Indexes      IndexSummary       `json:"indexes"`
+	Indexes       IndexSummary        `json:"indexes"`
-	Constraints  ConstraintSummary  `json:"constraints"`
+	Constraints   ConstraintSummary   `json:"constraints"`
 	Relationships RelationshipSummary `json:"relationships"`
-	Views        ViewSummary        `json:"views"`
+	Views         ViewSummary         `json:"views"`
-	Sequences    SequenceSummary    `json:"sequences"`
+	Sequences     SequenceSummary     `json:"sequences"`
 }
 
 type SchemaSummary struct {

pkg/models/dctx.go

@@ -2,7 +2,13 @@ package models
 
 import "encoding/xml"
 
-// DCTXDictionary represents the root element of a DCTX file
+// DCTX File Format Models
+//
+// This file defines the data structures for parsing and generating DCTX
+// (Data Dictionary) XML files, which are used by Clarion development tools
+// for database schema definitions.
+
+// DCTXDictionary represents the root element of a DCTX file.
 type DCTXDictionary struct {
 	XMLName   xml.Name       `xml:"Dictionary"`
 	Name      string         `xml:"Name,attr"`
@@ -11,7 +17,7 @@ type DCTXDictionary struct {
 	Relations []DCTXRelation `xml:"Relation,omitempty"`
 }
 
-// DCTXTable represents a table definition in DCTX
+// DCTXTable represents a table definition in DCTX format.
 type DCTXTable struct {
 	Guid        string       `xml:"Guid,attr"`
 	Name        string       `xml:"Name,attr"`
@@ -25,7 +31,8 @@ type DCTXTable struct {
 	Options     []DCTXOption `xml:"Option,omitempty"`
 }
 
-// DCTXField represents a field/column definition in DCTX
+// DCTXField represents a field/column definition in DCTX format.
+// Fields can be nested for GROUP structures.
 type DCTXField struct {
 	Guid       string       `xml:"Guid,attr"`
 	Name       string       `xml:"Name,attr"`
@@ -37,7 +44,7 @@ type DCTXField struct {
 	Options    []DCTXOption `xml:"Option,omitempty"`
 }
 
-// DCTXKey represents an index or key definition in DCTX
+// DCTXKey represents an index or key definition in DCTX format.
 type DCTXKey struct {
 	Guid        string          `xml:"Guid,attr"`
 	Name        string          `xml:"Name,attr"`
@@ -49,7 +56,7 @@ type DCTXKey struct {
 	Components  []DCTXComponent `xml:"Component"`
 }
 
-// DCTXComponent represents a component of a key (field reference)
+// DCTXComponent represents a component of a key, referencing a field in the index.
 type DCTXComponent struct {
 	Guid    string `xml:"Guid,attr"`
 	FieldId string `xml:"FieldId,attr,omitempty"`
@@ -57,14 +64,14 @@ type DCTXComponent struct {
 	Ascend  bool   `xml:"Ascend,attr,omitempty"`
 }
 
-// DCTXOption represents a property option in DCTX
+// DCTXOption represents a property option in DCTX format for metadata storage.
 type DCTXOption struct {
 	Property      string `xml:"Property,attr"`
 	PropertyType  string `xml:"PropertyType,attr,omitempty"`
 	PropertyValue string `xml:"PropertyValue,attr"`
 }
 
-// DCTXRelation represents a relationship/foreign key in DCTX
+// DCTXRelation represents a relationship/foreign key in DCTX format.
 type DCTXRelation struct {
 	Guid            string             `xml:"Guid,attr"`
 	PrimaryTable    string             `xml:"PrimaryTable,attr"`
@@ -77,7 +84,7 @@ type DCTXRelation struct {
 	PrimaryMappings []DCTXFieldMapping `xml:"PrimaryMapping,omitempty"`
 }
 
-// DCTXFieldMapping represents a field mapping in a relation
+// DCTXFieldMapping represents a field mapping in a relation for multi-column foreign keys.
 type DCTXFieldMapping struct {
 	Guid  string `xml:"Guid,attr"`
 	Field string `xml:"Field,attr"`

pkg/models/flatview.go

@@ -2,11 +2,14 @@ package models
 
 import "fmt"
 
-// =============================================================================
+// Flat/Denormalized Views
-// Flat/Denormalized Views - Flattened structures with fully qualified names
+//
-// =============================================================================
+// This file provides flattened data structures with fully qualified names
+// for easier querying and analysis of database schemas without navigating
+// nested hierarchies.
 
-// FlatColumn represents a column with full context in a single structure
+// FlatColumn represents a column with full database context in a single structure.
+// It includes fully qualified names for easy identification and querying.
 type FlatColumn struct {
 	DatabaseName       string `json:"database_name" yaml:"database_name" xml:"database_name"`
 	SchemaName         string `json:"schema_name" yaml:"schema_name" xml:"schema_name"`
@@ -25,7 +28,7 @@ type FlatColumn struct {
 	Comment            string `json:"comment,omitempty" yaml:"comment,omitempty" xml:"comment,omitempty"`
 }
 
-// ToFlatColumns converts a Database to a slice of FlatColumns
+// ToFlatColumns converts a Database to a slice of FlatColumns for denormalized access to all columns.
 func (d *Database) ToFlatColumns() []*FlatColumn {
 	flatColumns := make([]*FlatColumn, 0)
 
@@ -56,7 +59,7 @@ func (d *Database) ToFlatColumns() []*FlatColumn {
 	return flatColumns
 }
 
-// FlatTable represents a table with full context
+// FlatTable represents a table with full database context and aggregated counts.
 type FlatTable struct {
 	DatabaseName       string `json:"database_name" yaml:"database_name" xml:"database_name"`
 	SchemaName         string `json:"schema_name" yaml:"schema_name" xml:"schema_name"`
@@ -70,7 +73,7 @@ type FlatTable struct {
 	IndexCount         int    `json:"index_count" yaml:"index_count" xml:"index_count"`
 }
 
-// ToFlatTables converts a Database to a slice of FlatTables
+// ToFlatTables converts a Database to a slice of FlatTables for denormalized access to all tables.
 func (d *Database) ToFlatTables() []*FlatTable {
 	flatTables := make([]*FlatTable, 0)
 
@@ -94,7 +97,7 @@ func (d *Database) ToFlatTables() []*FlatTable {
 	return flatTables
 }
 
-// FlatConstraint represents a constraint with full context
+// FlatConstraint represents a constraint with full database context and resolved references.
 type FlatConstraint struct {
 	DatabaseName       string         `json:"database_name" yaml:"database_name" xml:"database_name"`
 	SchemaName         string         `json:"schema_name" yaml:"schema_name" xml:"schema_name"`
@@ -112,7 +115,7 @@ type FlatConstraint struct {
 	OnUpdate           string         `json:"on_update,omitempty" yaml:"on_update,omitempty" xml:"on_update,omitempty"`
 }
 
-// ToFlatConstraints converts a Database to a slice of FlatConstraints
+// ToFlatConstraints converts a Database to a slice of FlatConstraints for denormalized access to all constraints.
 func (d *Database) ToFlatConstraints() []*FlatConstraint {
 	flatConstraints := make([]*FlatConstraint, 0)
 
@@ -148,7 +151,7 @@ func (d *Database) ToFlatConstraints() []*FlatConstraint {
 	return flatConstraints
 }
 
-// FlatRelationship represents a relationship with full context
+// FlatRelationship represents a relationship with full database context and fully qualified table names.
 type FlatRelationship struct {
 	DatabaseName     string       `json:"database_name" yaml:"database_name" xml:"database_name"`
 	RelationshipName string       `json:"relationship_name" yaml:"relationship_name" xml:"relationship_name"`
@@ -164,7 +167,7 @@ type FlatRelationship struct {
 	Description      string       `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
 }
 
-// ToFlatRelationships converts a Database to a slice of FlatRelationships
+// ToFlatRelationships converts a Database to a slice of FlatRelationships for denormalized access to all relationships.
 func (d *Database) ToFlatRelationships() []*FlatRelationship {
 	flatRelationships := make([]*FlatRelationship, 0)
 

pkg/models/models.go

@@ -1,13 +1,19 @@
+// Package models provides the core data structures for representing database schemas.
+// It defines types for databases, schemas, tables, columns, relationships, constraints,
+// indexes, views, sequences, and other database objects. These models serve as the
+// intermediate representation for converting between various database schema formats.
 package models
 
 import "strings"
 
+// DatabaseType represents the type of database system.
 type DatabaseType string
 
+// Supported database types.
 const (
-	PostgresqlDatabaseType DatabaseType = "pgsql"
+	PostgresqlDatabaseType DatabaseType = "pgsql"  // PostgreSQL database
-	MSSQLDatabaseType      DatabaseType = "mssql"
+	MSSQLDatabaseType      DatabaseType = "mssql"  // Microsoft SQL Server database
-	SqlLiteDatabaseType    DatabaseType = "sqlite"
+	SqlLiteDatabaseType    DatabaseType = "sqlite" // SQLite database
 )
 
 // Database represents the complete database schema
@@ -21,11 +27,13 @@ type Database struct {
 	SourceFormat    string       `json:"source_format,omitempty" yaml:"source_format,omitempty" xml:"source_format,omitempty"` // Source Format of the database.
 }
 
-// SQLNamer returns the database name in lowercase
+// SQLName returns the database name in lowercase for SQL compatibility.
 func (d *Database) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// Schema represents a database schema, which is a logical grouping of database objects
+// such as tables, views, sequences, and relationships within a database.
 type Schema struct {
 	Name        string            `json:"name" yaml:"name" xml:"name"`
 	Description string            `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
@@ -40,13 +48,16 @@ type Schema struct {
 	Sequence    uint              `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 	RefDatabase *Database         `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
 	Relations   []*Relationship   `json:"relations,omitempty" yaml:"relations,omitempty" xml:"-"`
+	Enums       []*Enum           `json:"enums,omitempty" yaml:"enums,omitempty" xml:"enums"`
 }
 
-// SQLName returns the schema name in lowercase
+// SQLName returns the schema name in lowercase for SQL compatibility.
 func (d *Schema) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// Table represents a database table with its columns, constraints, indexes,
+// and relationships. Tables are the primary data storage structures in a database.
 type Table struct {
 	Name          string                   `json:"name" yaml:"name" xml:"name"`
 	Description   string                   `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
@@ -62,11 +73,12 @@ type Table struct {
 	RefSchema     *Schema                  `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
 }
 
-// SQLName returns the table name in lowercase
+// SQLName returns the table name in lowercase for SQL compatibility.
 func (d *Table) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// GetPrimaryKey returns the primary key column for the table, or nil if none exists.
 func (m Table) GetPrimaryKey() *Column {
 	for _, column := range m.Columns {
 		if column.IsPrimaryKey {
@@ -76,6 +88,7 @@ func (m Table) GetPrimaryKey() *Column {
 	return nil
 }
 
+// GetForeignKeys returns all foreign key constraints for the table.
 func (m Table) GetForeignKeys() []*Constraint {
 	keys := make([]*Constraint, 0)
 
@@ -100,7 +113,7 @@ type View struct {
 	RefSchema   *Schema            `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
 }
 
-// SQLName returns the view name in lowercase
+// SQLName returns the view name in lowercase for SQL compatibility.
 func (d *View) SQLName() string {
 	return strings.ToLower(d.Name)
 }
@@ -123,7 +136,7 @@ type Sequence struct {
 	RefSchema     *Schema `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
 }
 
-// SQLName returns the sequence name in lowercase
+// SQLName returns the sequence name in lowercase for SQL compatibility.
 func (d *Sequence) SQLName() string {
 	return strings.ToLower(d.Name)
 }
@@ -147,11 +160,13 @@ type Column struct {
 	Sequence      uint   `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 }
 
-// SQLName returns the table name in lowercase
+// SQLName returns the column name in lowercase for SQL compatibility.
 func (d *Column) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// Index represents a database index for optimizing query performance.
+// Indexes can be unique, partial, or include additional columns.
 type Index struct {
 	Name        string   `json:"name" yaml:"name" xml:"name"`
 	Description string   `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
@@ -167,19 +182,23 @@ type Index struct {
 	Sequence    uint     `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 }
 
-// SQLName returns the Indexin lowercase
+// SQLName returns the index name in lowercase for SQL compatibility.
 func (d *Index) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// RelationType represents the type of relationship between database tables.
 type RelationType string
 
+// Supported relationship types.
 const (
-	OneToOne   RelationType = "one_to_one"
+	OneToOne   RelationType = "one_to_one"   // One record in table A relates to one record in table B
-	OneToMany  RelationType = "one_to_many"
+	OneToMany  RelationType = "one_to_many"  // One record in table A relates to many records in table B
-	ManyToMany RelationType = "many_to_many"
+	ManyToMany RelationType = "many_to_many" // Many records in table A relate to many records in table B
 )
 
+// Relationship represents a relationship between two database tables.
+// Relationships can be one-to-one, one-to-many, or many-to-many.
 type Relationship struct {
 	Name          string            `json:"name" yaml:"name" xml:"name"`
 	Type          RelationType      `json:"type" yaml:"type" xml:"type"`
@@ -197,11 +216,13 @@ type Relationship struct {
 	Sequence      uint              `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 }
 
-// SQLName returns the Relationship lowercase
+// SQLName returns the relationship name in lowercase for SQL compatibility.
 func (d *Relationship) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// Constraint represents a database constraint that enforces data integrity rules.
+// Constraints can be primary keys, foreign keys, unique constraints, check constraints, or not-null constraints.
 type Constraint struct {
 	Name              string         `json:"name" yaml:"name" xml:"name"`
 	Type              ConstraintType `json:"type" yaml:"type" xml:"type"`
@@ -219,20 +240,37 @@ type Constraint struct {
 	Sequence          uint           `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 }
 
+// SQLName returns the constraint name in lowercase for SQL compatibility.
 func (d *Constraint) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// ConstraintType represents the type of database constraint.
 type ConstraintType string
 
+// Enum represents a database enumeration type with a set of allowed values.
+type Enum struct {
+	Name   string   `json:"name" yaml:"name" xml:"name"`
+	Values []string `json:"values" yaml:"values" xml:"values"`
+	Schema string   `json:"schema,omitempty" yaml:"schema,omitempty" xml:"schema,omitempty"`
+}
+
+// SQLName returns the enum name in lowercase for SQL compatibility.
+func (d *Enum) SQLName() string {
+	return strings.ToLower(d.Name)
+}
+
+// Supported constraint types.
 const (
-	PrimaryKeyConstraint ConstraintType = "primary_key"
+	PrimaryKeyConstraint ConstraintType = "primary_key" // Primary key uniquely identifies each record
-	ForeignKeyConstraint ConstraintType = "foreign_key"
+	ForeignKeyConstraint ConstraintType = "foreign_key" // Foreign key references another table
-	UniqueConstraint     ConstraintType = "unique"
+	UniqueConstraint     ConstraintType = "unique"      // Unique constraint ensures all values are different
-	CheckConstraint      ConstraintType = "check"
+	CheckConstraint      ConstraintType = "check"       // Check constraint validates data against an expression
-	NotNullConstraint    ConstraintType = "not_null"
+	NotNullConstraint    ConstraintType = "not_null"    // Not null constraint requires a value
 )
 
+// Script represents a database migration or initialization script.
+// Scripts can have dependencies and rollback capabilities.
 type Script struct {
 	Name        string   `json:"name" yaml:"name" xml:"name"`
 	Description string   `json:"description" yaml:"description" xml:"description"`
@@ -245,11 +283,12 @@ type Script struct {
 	Sequence    uint     `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 }
 
+// SQLName returns the script name in lowercase for SQL compatibility.
 func (d *Script) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
-// Initialize functions
+// Initialization functions for creating new model instances with proper defaults.
 
 // InitDatabase initializes a new Database with empty slices
 func InitDatabase(name string) *Database {

pkg/models/summaryview.go

@@ -1,10 +1,12 @@
 package models
 
-// =============================================================================
+// Summary/Compact Views
-// Summary/Compact Views - Lightweight views with essential fields
+//
-// =============================================================================
+// This file provides lightweight summary structures with essential fields
+// and aggregated counts for quick database schema overviews without loading
+// full object graphs.
 
-// DatabaseSummary provides a compact overview of a database
+// DatabaseSummary provides a compact overview of a database with aggregated statistics.
 type DatabaseSummary struct {
 	Name            string       `json:"name" yaml:"name" xml:"name"`
 	Description     string       `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
@@ -15,7 +17,7 @@ type DatabaseSummary struct {
 	TotalColumns    int          `json:"total_columns" yaml:"total_columns" xml:"total_columns"`
 }
 
-// ToSummary converts a Database to a DatabaseSummary
+// ToSummary converts a Database to a DatabaseSummary with calculated counts.
 func (d *Database) ToSummary() *DatabaseSummary {
 	summary := &DatabaseSummary{
 		Name:            d.Name,
@@ -36,7 +38,7 @@ func (d *Database) ToSummary() *DatabaseSummary {
 	return summary
 }
 
-// SchemaSummary provides a compact overview of a schema
+// SchemaSummary provides a compact overview of a schema with aggregated statistics.
 type SchemaSummary struct {
 	Name             string `json:"name" yaml:"name" xml:"name"`
 	Description      string `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
@@ -47,7 +49,7 @@ type SchemaSummary struct {
 	TotalConstraints int    `json:"total_constraints" yaml:"total_constraints" xml:"total_constraints"`
 }
 
-// ToSummary converts a Schema to a SchemaSummary
+// ToSummary converts a Schema to a SchemaSummary with calculated counts.
 func (s *Schema) ToSummary() *SchemaSummary {
 	summary := &SchemaSummary{
 		Name:        s.Name,
@@ -66,7 +68,7 @@ func (s *Schema) ToSummary() *SchemaSummary {
 	return summary
 }
 
-// TableSummary provides a compact overview of a table
+// TableSummary provides a compact overview of a table with aggregated statistics.
 type TableSummary struct {
 	Name              string `json:"name" yaml:"name" xml:"name"`
 	Schema            string `json:"schema" yaml:"schema" xml:"schema"`
@@ -79,7 +81,7 @@ type TableSummary struct {
 	ForeignKeyCount   int    `json:"foreign_key_count" yaml:"foreign_key_count" xml:"foreign_key_count"`
 }
 
-// ToSummary converts a Table to a TableSummary
+// ToSummary converts a Table to a TableSummary with calculated counts.
 func (t *Table) ToSummary() *TableSummary {
 	summary := &TableSummary{
 		Name:              t.Name,

pkg/readers/bun/README.md

@@ -0,0 +1,106 @@
+# Bun Reader
+
+Reads Go source files containing Bun model definitions and extracts database schema information.
+
+## Overview
+
+The Bun Reader parses Go source code files that define Bun models (structs with `bun` struct tags) and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Parses Bun struct tags to extract column definitions
+- Extracts table names from `bun:"table:tablename"` tags
+- Identifies primary keys, foreign keys, and indexes
+- Supports relationship detection
+- Handles both single files and directories
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/bun"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/models.go",
+    }
+
+    reader := bun.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read Bun models and convert to JSON
+relspec --input bun --in-file models/ --output json --out-file schema.json
+
+# Convert Bun models to GORM
+relspec --input bun --in-file models.go --output gorm --out-file gorm_models.go
+```
+
+## Supported Bun Tags
+
+The reader recognizes the following Bun struct tags:
+
+- `table` - Table name
+- `column` - Column name
+- `type` - SQL data type
+- `pk` - Primary key
+- `notnull` - NOT NULL constraint
+- `autoincrement` - Auto-increment column
+- `default` - Default value
+- `unique` - Unique constraint
+- `rel` - Relationship definition
+
+## Example Bun Model
+
+```go
+package models
+
+import (
+    "time"
+    "github.com/uptrace/bun"
+)
+
+type User struct {
+    bun.BaseModel `bun:"table:users,alias:u"`
+
+    ID        int64     `bun:"id,pk,autoincrement"`
+    Username  string    `bun:"username,notnull,unique"`
+    Email     string    `bun:"email,notnull"`
+    CreatedAt time.Time `bun:"created_at,notnull,default:now()"`
+
+    Posts []*Post `bun:"rel:has-many,join:id=user_id"`
+}
+
+type Post struct {
+    bun.BaseModel `bun:"table:posts,alias:p"`
+
+    ID      int64  `bun:"id,pk"`
+    UserID  int64  `bun:"user_id,notnull"`
+    Title   string `bun:"title,notnull"`
+    Content string `bun:"content"`
+
+    User *User `bun:"rel:belongs-to,join:user_id=id"`
+}
+```
+
+## Notes
+
+- Test files (ending in `_test.go`) are automatically excluded
+- The `bun.BaseModel` embedded struct is automatically recognized
+- Schema defaults to `public` if not specified

pkg/readers/bun/reader.go

@@ -382,6 +382,23 @@ func (r *Reader) isRelationship(tag string) bool {
 	return strings.Contains(tag, "bun:\"rel:") || strings.Contains(tag, ",rel:")
 }
 
+// getRelationType extracts the relationship type from a bun tag
+func (r *Reader) getRelationType(bunTag string) string {
+	if strings.Contains(bunTag, "rel:has-many") {
+		return "has-many"
+	}
+	if strings.Contains(bunTag, "rel:belongs-to") {
+		return "belongs-to"
+	}
+	if strings.Contains(bunTag, "rel:has-one") {
+		return "has-one"
+	}
+	if strings.Contains(bunTag, "rel:many-to-many") {
+		return "many-to-many"
+	}
+	return ""
+}
+
 // parseRelationshipConstraints parses relationship fields to extract foreign key constraints
 func (r *Reader) parseRelationshipConstraints(table *models.Table, structType *ast.StructType, structMap map[string]*models.Table) {
 	for _, field := range structType.Fields.List {
@@ -409,27 +426,51 @@ func (r *Reader) parseRelationshipConstraints(table *models.Table, structType *a
 		}
 
 		// Parse the join information: join:user_id=id
-		// This means: referencedTable.user_id = thisTable.id
+		// This means: thisTable.user_id = referencedTable.id
 		joinInfo := r.parseJoinInfo(bunTag)
 		if joinInfo == nil {
 			continue
 		}
 
-		// The FK is on the referenced table
+		// Determine which table gets the FK based on relationship type
+		relType := r.getRelationType(bunTag)
+
+		var fkTable *models.Table
+		var fkColumn, refTable, refColumn string
+
+		switch strings.ToLower(relType) {
+		case "belongs-to":
+			// For belongs-to: FK is on the current table
+			// join:user_id=id means table.user_id references referencedTable.id
+			fkTable = table
+			fkColumn = joinInfo.ForeignKey
+			refTable = referencedTable.Name
+			refColumn = joinInfo.ReferencedKey
+		case "has-many":
+			// For has-many: FK is on the referenced table
+			// join:id=user_id means referencedTable.user_id references table.id
+			fkTable = referencedTable
+			fkColumn = joinInfo.ReferencedKey
+			refTable = table.Name
+			refColumn = joinInfo.ForeignKey
+		default:
+			continue
+		}
+
 		constraint := &models.Constraint{
-			Name:              fmt.Sprintf("fk_%s_%s", referencedTable.Name, table.Name),
+			Name:              fmt.Sprintf("fk_%s_%s", fkTable.Name, refTable),
 			Type:              models.ForeignKeyConstraint,
-			Table:             referencedTable.Name,
+			Table:             fkTable.Name,
-			Schema:            referencedTable.Schema,
+			Schema:            fkTable.Schema,
-			Columns:           []string{joinInfo.ForeignKey},
+			Columns:           []string{fkColumn},
-			ReferencedTable:   table.Name,
+			ReferencedTable:   refTable,
-			ReferencedSchema:  table.Schema,
+			ReferencedSchema:  fkTable.Schema,
-			ReferencedColumns: []string{joinInfo.ReferencedKey},
+			ReferencedColumns: []string{refColumn},
 			OnDelete:          "NO ACTION", // Bun doesn't specify this in tags
 			OnUpdate:          "NO ACTION",
 		}
 
-		referencedTable.Constraints[constraint.Name] = constraint
+		fkTable.Constraints[constraint.Name] = constraint
 	}
 }
 
@@ -626,17 +667,14 @@ func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, s
 	// - nullzero tag means the field is nullable (can be NULL in DB)
 	// - absence of nullzero means the field is NOT NULL
 	// - primitive types (int64, bool, string) are NOT NULL by default
+	column.NotNull = true
+	// Primary keys are always NOT NULL
+
 	if strings.Contains(bunTag, "nullzero") {
 		column.NotNull = false
-	} else if r.isNullableGoType(fieldType) {
-		// SqlString, SqlInt, etc. without nullzero tag means NOT NULL
-		column.NotNull = true
 	} else {
-		// Primitive types are NOT NULL by default
+		column.NotNull = !r.isNullableGoType(fieldType)
-		column.NotNull = true
 	}
-
-	// Primary keys are always NOT NULL
 	if column.IsPrimaryKey {
 		column.NotNull = true
 	}

pkg/readers/bun/reader_test.go

@@ -0,0 +1,522 @@
+package bun
+
+import (
+	"path/filepath"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+func TestReader_ReadDatabase_Simple(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "bun", "simple.go"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	schema := db.Schemas[0]
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	if len(schema.Tables) != 1 {
+		t.Fatalf("Expected 1 table, got %d", len(schema.Tables))
+	}
+
+	table := schema.Tables[0]
+	if table.Name != "users" {
+		t.Errorf("Expected table name 'users', got '%s'", table.Name)
+	}
+
+	if len(table.Columns) != 6 {
+		t.Errorf("Expected 6 columns, got %d", len(table.Columns))
+	}
+
+	// Verify id column - primary key should be NOT NULL
+	idCol, exists := table.Columns["id"]
+	if !exists {
+		t.Fatal("Column 'id' not found")
+	}
+	if !idCol.IsPrimaryKey {
+		t.Error("Column 'id' should be primary key")
+	}
+	if !idCol.AutoIncrement {
+		t.Error("Column 'id' should be auto-increment")
+	}
+	if !idCol.NotNull {
+		t.Error("Column 'id' should be NOT NULL (primary keys are always NOT NULL)")
+	}
+	if idCol.Type != "bigint" {
+		t.Errorf("Expected id type 'bigint', got '%s'", idCol.Type)
+	}
+
+	// Verify email column - explicit notnull tag should be NOT NULL
+	emailCol, exists := table.Columns["email"]
+	if !exists {
+		t.Fatal("Column 'email' not found")
+	}
+	if !emailCol.NotNull {
+		t.Error("Column 'email' should be NOT NULL (explicit 'notnull' tag)")
+	}
+	if emailCol.Type != "varchar" || emailCol.Length != 255 {
+		t.Errorf("Expected email type 'varchar(255)', got '%s' with length %d", emailCol.Type, emailCol.Length)
+	}
+
+	// Verify name column - primitive string type should be NOT NULL by default in Bun
+	nameCol, exists := table.Columns["name"]
+	if !exists {
+		t.Fatal("Column 'name' not found")
+	}
+	if !nameCol.NotNull {
+		t.Error("Column 'name' should be NOT NULL (primitive string type, no nullzero tag)")
+	}
+	if nameCol.Type != "text" {
+		t.Errorf("Expected name type 'text', got '%s'", nameCol.Type)
+	}
+
+	// Verify age column - pointer type should be nullable (NOT NULL = false)
+	ageCol, exists := table.Columns["age"]
+	if !exists {
+		t.Fatal("Column 'age' not found")
+	}
+	if ageCol.NotNull {
+		t.Error("Column 'age' should be nullable (pointer type *int)")
+	}
+	if ageCol.Type != "integer" {
+		t.Errorf("Expected age type 'integer', got '%s'", ageCol.Type)
+	}
+
+	// Verify is_active column - primitive bool type should be NOT NULL by default
+	isActiveCol, exists := table.Columns["is_active"]
+	if !exists {
+		t.Fatal("Column 'is_active' not found")
+	}
+	if !isActiveCol.NotNull {
+		t.Error("Column 'is_active' should be NOT NULL (primitive bool type, no nullzero tag)")
+	}
+	if isActiveCol.Type != "boolean" {
+		t.Errorf("Expected is_active type 'boolean', got '%s'", isActiveCol.Type)
+	}
+
+	// Verify created_at column - time.Time should be NOT NULL by default
+	createdAtCol, exists := table.Columns["created_at"]
+	if !exists {
+		t.Fatal("Column 'created_at' not found")
+	}
+	if !createdAtCol.NotNull {
+		t.Error("Column 'created_at' should be NOT NULL (time.Time is NOT NULL by default)")
+	}
+	if createdAtCol.Type != "timestamp" {
+		t.Errorf("Expected created_at type 'timestamp', got '%s'", createdAtCol.Type)
+	}
+
+	// Verify unique index on email
+	if len(table.Indexes) < 1 {
+		t.Error("Expected at least 1 index on users table")
+	}
+}
+
+func TestReader_ReadDatabase_Complex(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "bun", "complex.go"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Verify schema
+	if len(db.Schemas) != 1 {
+		t.Fatalf("Expected 1 schema, got %d", len(db.Schemas))
+	}
+
+	schema := db.Schemas[0]
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	// Verify tables
+	if len(schema.Tables) != 3 {
+		t.Fatalf("Expected 3 tables, got %d", len(schema.Tables))
+	}
+
+	// Find tables
+	var usersTable, postsTable, commentsTable *models.Table
+	for _, table := range schema.Tables {
+		switch table.Name {
+		case "users":
+			usersTable = table
+		case "posts":
+			postsTable = table
+		case "comments":
+			commentsTable = table
+		}
+	}
+
+	if usersTable == nil {
+		t.Fatal("Users table not found")
+	}
+	if postsTable == nil {
+		t.Fatal("Posts table not found")
+	}
+	if commentsTable == nil {
+		t.Fatal("Comments table not found")
+	}
+
+	// Verify users table - test NOT NULL logic for various field types
+	if len(usersTable.Columns) != 10 {
+		t.Errorf("Expected 10 columns in users table, got %d", len(usersTable.Columns))
+	}
+
+	// username - NOT NULL (explicit notnull tag)
+	usernameCol, exists := usersTable.Columns["username"]
+	if !exists {
+		t.Fatal("Column 'username' not found")
+	}
+	if !usernameCol.NotNull {
+		t.Error("Column 'username' should be NOT NULL (explicit 'notnull' tag)")
+	}
+
+	// first_name - nullable (pointer type)
+	firstNameCol, exists := usersTable.Columns["first_name"]
+	if !exists {
+		t.Fatal("Column 'first_name' not found")
+	}
+	if firstNameCol.NotNull {
+		t.Error("Column 'first_name' should be nullable (pointer type *string)")
+	}
+
+	// last_name - nullable (pointer type)
+	lastNameCol, exists := usersTable.Columns["last_name"]
+	if !exists {
+		t.Fatal("Column 'last_name' not found")
+	}
+	if lastNameCol.NotNull {
+		t.Error("Column 'last_name' should be nullable (pointer type *string)")
+	}
+
+	// bio - nullable (pointer type)
+	bioCol, exists := usersTable.Columns["bio"]
+	if !exists {
+		t.Fatal("Column 'bio' not found")
+	}
+	if bioCol.NotNull {
+		t.Error("Column 'bio' should be nullable (pointer type *string)")
+	}
+
+	// is_active - NOT NULL (primitive bool without nullzero)
+	isActiveCol, exists := usersTable.Columns["is_active"]
+	if !exists {
+		t.Fatal("Column 'is_active' not found")
+	}
+	if !isActiveCol.NotNull {
+		t.Error("Column 'is_active' should be NOT NULL (primitive bool type without nullzero)")
+	}
+
+	// Verify users table indexes
+	if len(usersTable.Indexes) < 1 {
+		t.Error("Expected at least 1 index on users table")
+	}
+
+	// Verify posts table
+	if len(postsTable.Columns) != 11 {
+		t.Errorf("Expected 11 columns in posts table, got %d", len(postsTable.Columns))
+	}
+
+	// excerpt - nullable (pointer type)
+	excerptCol, exists := postsTable.Columns["excerpt"]
+	if !exists {
+		t.Fatal("Column 'excerpt' not found")
+	}
+	if excerptCol.NotNull {
+		t.Error("Column 'excerpt' should be nullable (pointer type *string)")
+	}
+
+	// published - NOT NULL (primitive bool without nullzero)
+	publishedCol, exists := postsTable.Columns["published"]
+	if !exists {
+		t.Fatal("Column 'published' not found")
+	}
+	if !publishedCol.NotNull {
+		t.Error("Column 'published' should be NOT NULL (primitive bool type without nullzero)")
+	}
+
+	// published_at - nullable (has nullzero tag)
+	publishedAtCol, exists := postsTable.Columns["published_at"]
+	if !exists {
+		t.Fatal("Column 'published_at' not found")
+	}
+	if publishedAtCol.NotNull {
+		t.Error("Column 'published_at' should be nullable (has nullzero tag)")
+	}
+
+	// view_count - NOT NULL (primitive int64 without nullzero)
+	viewCountCol, exists := postsTable.Columns["view_count"]
+	if !exists {
+		t.Fatal("Column 'view_count' not found")
+	}
+	if !viewCountCol.NotNull {
+		t.Error("Column 'view_count' should be NOT NULL (primitive int64 type without nullzero)")
+	}
+
+	// Verify posts table indexes
+	if len(postsTable.Indexes) < 1 {
+		t.Error("Expected at least 1 index on posts table")
+	}
+
+	// Verify comments table
+	if len(commentsTable.Columns) != 6 {
+		t.Errorf("Expected 6 columns in comments table, got %d", len(commentsTable.Columns))
+	}
+
+	// user_id - nullable (pointer type)
+	userIDCol, exists := commentsTable.Columns["user_id"]
+	if !exists {
+		t.Fatal("Column 'user_id' not found in comments table")
+	}
+	if userIDCol.NotNull {
+		t.Error("Column 'user_id' should be nullable (pointer type *int64)")
+	}
+
+	// post_id - NOT NULL (explicit notnull tag)
+	postIDCol, exists := commentsTable.Columns["post_id"]
+	if !exists {
+		t.Fatal("Column 'post_id' not found in comments table")
+	}
+	if !postIDCol.NotNull {
+		t.Error("Column 'post_id' should be NOT NULL (explicit 'notnull' tag)")
+	}
+
+	// Verify foreign key constraints are created from relationship tags
+	// In Bun, relationships are defined with rel: tags
+	// The constraints should be created on the referenced tables
+	if len(postsTable.Constraints) > 0 {
+		// Check if FK constraint exists
+		var fkPostsUser *models.Constraint
+		for _, c := range postsTable.Constraints {
+			if c.Type == models.ForeignKeyConstraint && c.ReferencedTable == "users" {
+				fkPostsUser = c
+				break
+			}
+		}
+
+		if fkPostsUser != nil {
+			if len(fkPostsUser.Columns) != 1 || fkPostsUser.Columns[0] != "user_id" {
+				t.Error("Expected FK column 'user_id'")
+			}
+			if len(fkPostsUser.ReferencedColumns) != 1 || fkPostsUser.ReferencedColumns[0] != "id" {
+				t.Error("Expected FK referenced column 'id'")
+			}
+		}
+	}
+
+	if len(commentsTable.Constraints) > 0 {
+		// Check if FK constraints exist
+		var fkCommentsPost, fkCommentsUser *models.Constraint
+		for _, c := range commentsTable.Constraints {
+			if c.Type == models.ForeignKeyConstraint {
+				if c.ReferencedTable == "posts" {
+					fkCommentsPost = c
+				} else if c.ReferencedTable == "users" {
+					fkCommentsUser = c
+				}
+			}
+		}
+
+		if fkCommentsPost != nil {
+			if len(fkCommentsPost.Columns) != 1 || fkCommentsPost.Columns[0] != "post_id" {
+				t.Error("Expected FK column 'post_id'")
+			}
+		}
+
+		if fkCommentsUser != nil {
+			if len(fkCommentsUser.Columns) != 1 || fkCommentsUser.Columns[0] != "user_id" {
+				t.Error("Expected FK column 'user_id'")
+			}
+		}
+	}
+}
+
+func TestReader_ReadSchema(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "bun", "simple.go"),
+	}
+
+	reader := NewReader(opts)
+	schema, err := reader.ReadSchema()
+	if err != nil {
+		t.Fatalf("ReadSchema() error = %v", err)
+	}
+
+	if schema == nil {
+		t.Fatal("ReadSchema() returned nil schema")
+	}
+
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	if len(schema.Tables) != 1 {
+		t.Errorf("Expected 1 table, got %d", len(schema.Tables))
+	}
+}
+
+func TestReader_ReadTable(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "bun", "simple.go"),
+	}
+
+	reader := NewReader(opts)
+	table, err := reader.ReadTable()
+	if err != nil {
+		t.Fatalf("ReadTable() error = %v", err)
+	}
+
+	if table == nil {
+		t.Fatal("ReadTable() returned nil table")
+	}
+
+	if table.Name != "users" {
+		t.Errorf("Expected table name 'users', got '%s'", table.Name)
+	}
+
+	if len(table.Columns) != 6 {
+		t.Errorf("Expected 6 columns, got %d", len(table.Columns))
+	}
+}
+
+func TestReader_ReadDatabase_Directory(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "bun"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Should read both simple.go and complex.go
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	schema := db.Schemas[0]
+	// Should have at least 3 tables from complex.go (users, posts, comments)
+	// plus 1 from simple.go (users) - but same table name, so may be overwritten
+	if len(schema.Tables) < 3 {
+		t.Errorf("Expected at least 3 tables, got %d", len(schema.Tables))
+	}
+}
+
+func TestReader_ReadDatabase_InvalidPath(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: "/nonexistent/file.go",
+	}
+
+	reader := NewReader(opts)
+	_, err := reader.ReadDatabase()
+	if err == nil {
+		t.Error("Expected error for invalid file path")
+	}
+}
+
+func TestReader_ReadDatabase_EmptyPath(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: "",
+	}
+
+	reader := NewReader(opts)
+	_, err := reader.ReadDatabase()
+	if err == nil {
+		t.Error("Expected error for empty file path")
+	}
+}
+
+func TestReader_NullableTypes(t *testing.T) {
+	// This test specifically verifies the NOT NULL logic changes
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "bun", "complex.go"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	// Find posts table
+	var postsTable *models.Table
+	for _, schema := range db.Schemas {
+		for _, table := range schema.Tables {
+			if table.Name == "posts" {
+				postsTable = table
+				break
+			}
+		}
+	}
+
+	if postsTable == nil {
+		t.Fatal("Posts table not found")
+	}
+
+	// Test all nullability scenarios
+	tests := []struct {
+		column   string
+		notNull  bool
+		reason   string
+	}{
+		{"id", true, "primary key"},
+		{"user_id", true, "explicit notnull tag"},
+		{"title", true, "explicit notnull tag"},
+		{"slug", true, "explicit notnull tag"},
+		{"content", true, "explicit notnull tag"},
+		{"excerpt", false, "pointer type *string"},
+		{"published", true, "primitive bool without nullzero"},
+		{"view_count", true, "primitive int64 without nullzero"},
+		{"published_at", false, "has nullzero tag"},
+		{"created_at", true, "time.Time without nullzero"},
+		{"updated_at", true, "time.Time without nullzero"},
+	}
+
+	for _, tt := range tests {
+		col, exists := postsTable.Columns[tt.column]
+		if !exists {
+			t.Errorf("Column '%s' not found", tt.column)
+			continue
+		}
+
+		if col.NotNull != tt.notNull {
+			if tt.notNull {
+				t.Errorf("Column '%s' should be NOT NULL (%s), but NotNull=%v",
+					tt.column, tt.reason, col.NotNull)
+			} else {
+				t.Errorf("Column '%s' should be nullable (%s), but NotNull=%v",
+					tt.column, tt.reason, col.NotNull)
+			}
+		}
+	}
+}

pkg/readers/dbml/README.md

@@ -0,0 +1,101 @@
+# DBML Reader
+
+Reads Database Markup Language (DBML) files and extracts database schema information.
+
+## Overview
+
+The DBML Reader parses `.dbml` files that define database schemas using the DBML syntax (used by dbdiagram.io) and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Parses DBML syntax
+- Extracts tables, columns, and relationships
+- Supports DBML-specific features:
+  - Table groups and notes
+  - Enum definitions
+  - Indexes
+  - Foreign key relationships
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/dbml"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/schema.dbml",
+    }
+
+    reader := dbml.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read DBML file and convert to JSON
+relspec --input dbml --in-file schema.dbml --output json --out-file schema.json
+
+# Convert DBML to GORM models
+relspec --input dbml --in-file database.dbml --output gorm --out-file models.go
+```
+
+## Example DBML File
+
+```dbml
+Table users {
+  id bigserial [pk, increment]
+  username varchar(50) [not null, unique]
+  email varchar(100) [not null]
+  created_at timestamp [not null, default: `now()`]
+
+  Note: 'Users table'
+}
+
+Table posts {
+  id bigserial [pk]
+  user_id bigint [not null, ref: > users.id]
+  title varchar(200) [not null]
+  content text
+
+  indexes {
+    user_id
+    (user_id, created_at) [name: 'idx_user_posts']
+  }
+}
+
+Ref: posts.user_id > users.id [delete: cascade]
+```
+
+## DBML Features Supported
+
+- Table definitions with columns
+- Primary keys (`pk`)
+- Not null constraints (`not null`)
+- Unique constraints (`unique`)
+- Default values (`default`)
+- Inline references (`ref`)
+- Standalone `Ref` blocks
+- Indexes and composite indexes
+- Table notes and column notes
+- Enums
+
+## Notes
+
+- DBML is designed for database documentation and diagramming
+- Schema name defaults to `public`
+- Relationship cardinality is preserved

pkg/readers/dctx/README.md

@@ -0,0 +1,96 @@
+# DCTX Reader
+
+Reads Clarion database dictionary (DCTX) files and extracts database schema information.
+
+## Overview
+
+The DCTX Reader parses Clarion dictionary files (`.dctx`) that define database structures in the Clarion development system and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Parses Clarion DCTX XML format
+- Extracts file (table) and field (column) definitions
+- Supports Clarion data types
+- Handles keys (indexes) and relationships
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/dctx"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/database.dctx",
+    }
+
+    reader := dctx.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read DCTX file and convert to JSON
+relspec --input dctx --in-file legacy.dctx --output json --out-file schema.json
+
+# Convert DCTX to GORM models for migration
+relspec --input dctx --in-file app.dctx --output gorm --out-file models.go
+
+# Export DCTX to PostgreSQL DDL
+relspec --input dctx --in-file database.dctx --output pgsql --out-file schema.sql
+```
+
+## Example DCTX Structure
+
+DCTX files are XML-based Clarion dictionary files that define:
+
+- Files (equivalent to tables)
+- Fields (columns) with Clarion-specific types
+- Keys (indexes)
+- Relationships between files
+
+Common Clarion data types:
+- `STRING` - Fixed-length string
+- `CSTRING` - C-style null-terminated string
+- `LONG` - 32-bit integer
+- `SHORT` - 16-bit integer
+- `DECIMAL` - Decimal number
+- `REAL` - Floating point
+- `DATE` - Date field
+- `TIME` - Time field
+
+## Type Mapping
+
+The reader automatically maps Clarion data types to standard SQL types:
+
+| Clarion Type | SQL Type |
+|--------------|----------|
+| STRING | VARCHAR |
+| CSTRING | VARCHAR |
+| LONG | INTEGER |
+| SHORT | SMALLINT |
+| DECIMAL | NUMERIC |
+| REAL | REAL |
+| DATE | DATE |
+| TIME | TIME |
+
+## Notes
+
+- DCTX is specific to Clarion development platform
+- Useful for migrating legacy Clarion applications
+- Schema name defaults to `public`
+- Preserves field properties and constraints where possible

pkg/readers/drawdb/README.md

@@ -0,0 +1,96 @@
+# DrawDB Reader
+
+Reads DrawDB schema files and extracts database schema information.
+
+## Overview
+
+The DrawDB Reader parses JSON files exported from DrawDB (a free online database design tool) and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Parses DrawDB JSON format
+- Extracts tables, fields, and relationships
+- Supports DrawDB-specific metadata
+- Preserves visual layout information
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/drawdb"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/diagram.json",
+    }
+
+    reader := drawdb.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read DrawDB export and convert to JSON schema
+relspec --input drawdb --in-file diagram.json --output json --out-file schema.json
+
+# Convert DrawDB design to GORM models
+relspec --input drawdb --in-file design.json --output gorm --out-file models.go
+```
+
+## Example DrawDB Export
+
+DrawDB exports database designs as JSON files containing:
+
+```json
+{
+  "tables": [
+    {
+      "id": "1",
+      "name": "users",
+      "fields": [
+        {
+          "name": "id",
+          "type": "BIGINT",
+          "primary": true,
+          "autoIncrement": true
+        },
+        {
+          "name": "username",
+          "type": "VARCHAR",
+          "size": 50,
+          "notNull": true,
+          "unique": true
+        }
+      ]
+    }
+  ],
+  "relationships": [
+    {
+      "source": "posts",
+      "target": "users",
+      "type": "many-to-one"
+    }
+  ]
+}
+```
+
+## Notes
+
+- DrawDB is a free online database designer at drawdb.vercel.app
+- Export format preserves visual design metadata
+- Useful for converting visual designs to code
+- Schema defaults to `public`

pkg/readers/drizzle/README.md

@@ -0,0 +1,90 @@
+# Drizzle Reader
+
+Reads TypeScript/JavaScript files containing Drizzle ORM schema definitions and extracts database schema information.
+
+## Overview
+
+The Drizzle Reader parses Drizzle ORM schema files (TypeScript/JavaScript) that define database tables using Drizzle's schema builder and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Parses Drizzle schema definitions
+- Extracts table, column, and relationship information
+- Supports various Drizzle column types
+- Handles constraints and indexes
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/drizzle"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/schema.ts",
+    }
+
+    reader := drizzle.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read Drizzle schema and convert to JSON
+relspec --input drizzle --in-file schema.ts --output json --out-file schema.json
+
+# Convert Drizzle to GORM models
+relspec --input drizzle --in-file schema/ --output gorm --out-file models.go
+```
+
+## Example Drizzle Schema
+
+```typescript
+import { pgTable, serial, varchar, text, timestamp, integer } from 'drizzle-orm/pg-core';
+import { relations } from 'drizzle-orm';
+
+export const users = pgTable('users', {
+  id: serial('id').primaryKey(),
+  username: varchar('username', { length: 50 }).notNull().unique(),
+  email: varchar('email', { length: 100 }).notNull(),
+  createdAt: timestamp('created_at').notNull().defaultNow(),
+});
+
+export const posts = pgTable('posts', {
+  id: serial('id').primaryKey(),
+  userId: integer('user_id').notNull().references(() => users.id, { onDelete: 'cascade' }),
+  title: varchar('title', { length: 200 }).notNull(),
+  content: text('content'),
+});
+
+export const usersRelations = relations(users, ({ many }) => ({
+  posts: many(posts),
+}));
+
+export const postsRelations = relations(posts, ({ one }) => ({
+  user: one(users, {
+    fields: [posts.userId],
+    references: [users.id],
+  }),
+}));
+```
+
+## Notes
+
+- Supports both PostgreSQL and MySQL Drizzle schemas
+- Extracts relationship information from `relations` definitions
+- Schema defaults to `public` for PostgreSQL

pkg/readers/drizzle/reader.go

@@ -0,0 +1,619 @@
+package drizzle
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+// Reader implements the readers.Reader interface for Drizzle schema format
+type Reader struct {
+	options *readers.ReaderOptions
+}
+
+// NewReader creates a new Drizzle reader with the given options
+func NewReader(options *readers.ReaderOptions) *Reader {
+	return &Reader{
+		options: options,
+	}
+}
+
+// ReadDatabase reads and parses Drizzle schema input, returning a Database model
+func (r *Reader) ReadDatabase() (*models.Database, error) {
+	if r.options.FilePath == "" {
+		return nil, fmt.Errorf("file path is required for Drizzle reader")
+	}
+
+	// Check if it's a file or directory
+	info, err := os.Stat(r.options.FilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to stat path: %w", err)
+	}
+
+	if info.IsDir() {
+		// Read all .ts files in the directory
+		return r.readDirectory(r.options.FilePath)
+	}
+
+	// Read single file
+	content, err := os.ReadFile(r.options.FilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read file: %w", err)
+	}
+
+	return r.parseDrizzle(string(content))
+}
+
+// ReadSchema reads and parses Drizzle schema input, returning a Schema model
+func (r *Reader) ReadSchema() (*models.Schema, error) {
+	db, err := r.ReadDatabase()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(db.Schemas) == 0 {
+		return nil, fmt.Errorf("no schemas found in Drizzle schema")
+	}
+
+	// Return the first schema
+	return db.Schemas[0], nil
+}
+
+// ReadTable reads and parses Drizzle schema input, returning a Table model
+func (r *Reader) ReadTable() (*models.Table, error) {
+	schema, err := r.ReadSchema()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(schema.Tables) == 0 {
+		return nil, fmt.Errorf("no tables found in Drizzle schema")
+	}
+
+	// Return the first table
+	return schema.Tables[0], nil
+}
+
+// readDirectory reads all .ts files in a directory and parses them
+func (r *Reader) readDirectory(dirPath string) (*models.Database, error) {
+	db := models.InitDatabase("database")
+
+	if r.options.Metadata != nil {
+		if name, ok := r.options.Metadata["name"].(string); ok {
+			db.Name = name
+		}
+	}
+
+	// Default schema for Drizzle
+	schema := models.InitSchema("public")
+	schema.Enums = make([]*models.Enum, 0)
+
+	// Read all .ts files
+	files, err := filepath.Glob(filepath.Join(dirPath, "*.ts"))
+	if err != nil {
+		return nil, fmt.Errorf("failed to glob directory: %w", err)
+	}
+
+	// Parse each file
+	for _, file := range files {
+		content, err := os.ReadFile(file)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read file %s: %w", file, err)
+		}
+
+		// Parse and merge into schema
+		fileDB, err := r.parseDrizzle(string(content))
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse file %s: %w", file, err)
+		}
+
+		// Merge schemas
+		if len(fileDB.Schemas) > 0 {
+			fileSchema := fileDB.Schemas[0]
+			schema.Tables = append(schema.Tables, fileSchema.Tables...)
+			schema.Enums = append(schema.Enums, fileSchema.Enums...)
+		}
+	}
+
+	db.Schemas = append(db.Schemas, schema)
+	return db, nil
+}
+
+// parseDrizzle parses Drizzle schema content and returns a Database model
+func (r *Reader) parseDrizzle(content string) (*models.Database, error) {
+	db := models.InitDatabase("database")
+
+	if r.options.Metadata != nil {
+		if name, ok := r.options.Metadata["name"].(string); ok {
+			db.Name = name
+		}
+	}
+
+	// Default schema for Drizzle (PostgreSQL)
+	schema := models.InitSchema("public")
+	schema.Enums = make([]*models.Enum, 0)
+	db.DatabaseType = models.PostgresqlDatabaseType
+
+	scanner := bufio.NewScanner(strings.NewReader(content))
+
+	// Regex patterns
+	// Match: export const users = pgTable('users', {
+	pgTableRegex := regexp.MustCompile(`export\s+const\s+(\w+)\s*=\s*pgTable\s*\(\s*['"](\w+)['"]`)
+	// Match: export const userRole = pgEnum('UserRole', ['admin', 'user']);
+	pgEnumRegex := regexp.MustCompile(`export\s+const\s+(\w+)\s*=\s*pgEnum\s*\(\s*['"](\w+)['"]`)
+
+	// State tracking
+	var currentTable *models.Table
+	var currentTableVarName string
+	var inTableBlock bool
+	var blockDepth int
+	var tableLines []string
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		trimmed := strings.TrimSpace(line)
+
+		// Skip empty lines and comments
+		if trimmed == "" || strings.HasPrefix(trimmed, "//") {
+			continue
+		}
+
+		// Check for pgEnum definition
+		if matches := pgEnumRegex.FindStringSubmatch(trimmed); matches != nil {
+			enum := r.parsePgEnum(trimmed, matches)
+			if enum != nil {
+				schema.Enums = append(schema.Enums, enum)
+			}
+			continue
+		}
+
+		// Check for pgTable definition
+		if matches := pgTableRegex.FindStringSubmatch(trimmed); matches != nil {
+			varName := matches[1]
+			tableName := matches[2]
+
+			currentTableVarName = varName
+			currentTable = models.InitTable(tableName, "public")
+			inTableBlock = true
+			// Count braces in the first line
+			blockDepth = strings.Count(line, "{") - strings.Count(line, "}")
+			tableLines = []string{line}
+			continue
+		}
+
+		// If we're in a table block, accumulate lines
+		if inTableBlock {
+			tableLines = append(tableLines, line)
+
+			// Track brace depth
+			blockDepth += strings.Count(line, "{")
+			blockDepth -= strings.Count(line, "}")
+
+			// Check if we've closed the table definition
+			if blockDepth < 0 || (blockDepth == 0 && strings.Contains(line, ");")) {
+				// Parse the complete table block
+				if currentTable != nil {
+					r.parseTableBlock(tableLines, currentTable, currentTableVarName)
+					schema.Tables = append(schema.Tables, currentTable)
+					currentTable = nil
+				}
+				inTableBlock = false
+				tableLines = nil
+			}
+		}
+	}
+
+	db.Schemas = append(db.Schemas, schema)
+	return db, nil
+}
+
+// parsePgEnum parses a pgEnum definition
+func (r *Reader) parsePgEnum(line string, matches []string) *models.Enum {
+	// matches[1] = variable name
+	// matches[2] = enum name
+
+	enumName := matches[2]
+
+	// Extract values from the array
+	// Example: pgEnum('UserRole', ['admin', 'user', 'guest'])
+	valuesRegex := regexp.MustCompile(`\[(.*?)\]`)
+	valuesMatch := valuesRegex.FindStringSubmatch(line)
+	if valuesMatch == nil {
+		return nil
+	}
+
+	valuesStr := valuesMatch[1]
+	// Split by comma and clean up
+	valueParts := strings.Split(valuesStr, ",")
+	values := make([]string, 0)
+	for _, part := range valueParts {
+		// Remove quotes and whitespace
+		cleaned := strings.TrimSpace(part)
+		cleaned = strings.Trim(cleaned, "'\"")
+		if cleaned != "" {
+			values = append(values, cleaned)
+		}
+	}
+
+	return &models.Enum{
+		Name:   enumName,
+		Values: values,
+		Schema: "public",
+	}
+}
+
+// parseTableBlock parses a complete pgTable definition block
+func (r *Reader) parseTableBlock(lines []string, table *models.Table, tableVarName string) {
+	// Join all lines into a single string for easier parsing
+	fullText := strings.Join(lines, "\n")
+
+	// Extract the columns block and index callback separately
+	// The structure is: pgTable('name', { columns }, (table) => [indexes])
+
+	// Find the main object block (columns)
+	columnsStart := strings.Index(fullText, "{")
+	if columnsStart == -1 {
+		return
+	}
+
+	// Find matching closing brace for columns
+	depth := 0
+	columnsEnd := -1
+	for i := columnsStart; i < len(fullText); i++ {
+		if fullText[i] == '{' {
+			depth++
+		} else if fullText[i] == '}' {
+			depth--
+			if depth == 0 {
+				columnsEnd = i
+				break
+			}
+		}
+	}
+
+	if columnsEnd == -1 {
+		return
+	}
+
+	columnsBlock := fullText[columnsStart+1 : columnsEnd]
+
+	// Parse columns
+	r.parseColumnsBlock(columnsBlock, table, tableVarName)
+
+	// Check for index callback: , (table) => [ or , ({ col1, col2 }) => [
+	// Match: }, followed by arrow function with any parameters
+	// Use (?s) flag to make . match newlines
+	indexCallbackRegex := regexp.MustCompile(`(?s)}\s*,\s*\(.*?\)\s*=>\s*\[`)
+	if indexCallbackRegex.MatchString(fullText[columnsEnd:]) {
+		// Find the index array
+		indexStart := strings.Index(fullText[columnsEnd:], "[")
+		if indexStart != -1 {
+			indexStart += columnsEnd
+			indexDepth := 0
+			indexEnd := -1
+			for i := indexStart; i < len(fullText); i++ {
+				if fullText[i] == '[' {
+					indexDepth++
+				} else if fullText[i] == ']' {
+					indexDepth--
+					if indexDepth == 0 {
+						indexEnd = i
+						break
+					}
+				}
+			}
+
+			if indexEnd != -1 {
+				indexBlock := fullText[indexStart+1 : indexEnd]
+				r.parseIndexBlock(indexBlock, table, tableVarName)
+			}
+		}
+	}
+}
+
+// parseColumnsBlock parses the columns block of a table
+func (r *Reader) parseColumnsBlock(block string, table *models.Table, tableVarName string) {
+	// Split by lines and parse each column definition
+	lines := strings.Split(block, "\n")
+
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed == "" || strings.HasPrefix(trimmed, "//") {
+			continue
+		}
+
+		// Match: fieldName: columnType('columnName').modifier().modifier(),
+		// Example: id: integer('id').primaryKey(),
+		columnRegex := regexp.MustCompile(`(\w+):\s*(\w+)\s*\(`)
+		matches := columnRegex.FindStringSubmatch(trimmed)
+		if matches == nil {
+			continue
+		}
+
+		fieldName := matches[1]
+		columnType := matches[2]
+
+		// Parse the column definition
+		col := r.parseColumnDefinition(trimmed, fieldName, columnType, table)
+		if col != nil {
+			table.Columns[col.Name] = col
+		}
+	}
+}
+
+// parseColumnDefinition parses a single column definition line
+func (r *Reader) parseColumnDefinition(line, fieldName, drizzleType string, table *models.Table) *models.Column {
+	// Check for enum column syntax: pgEnum('EnumName')('column_name')
+	enumRegex := regexp.MustCompile(`pgEnum\s*\(['"](\w+)['"]\)\s*\(['"](\w+)['"]\)`)
+	if enumMatch := enumRegex.FindStringSubmatch(line); enumMatch != nil {
+		enumName := enumMatch[1]
+		columnName := enumMatch[2]
+
+		column := models.InitColumn(columnName, table.Name, table.Schema)
+		column.Type = enumName
+		column.NotNull = false
+
+		// Parse modifiers
+		r.parseColumnModifiers(line, column, table)
+		return column
+	}
+
+	// Extract column name from the first argument
+	// Example: integer('id')
+	nameRegex := regexp.MustCompile(`\w+\s*\(['"](\w+)['"]\)`)
+	nameMatch := nameRegex.FindStringSubmatch(line)
+	if nameMatch == nil {
+		return nil
+	}
+
+	columnName := nameMatch[1]
+	column := models.InitColumn(columnName, table.Name, table.Schema)
+
+	// Map Drizzle type to SQL type
+	column.Type = r.drizzleTypeToSQL(drizzleType)
+
+	// Default: columns are nullable unless specified
+	column.NotNull = false
+
+	// Parse modifiers
+	r.parseColumnModifiers(line, column, table)
+
+	return column
+}
+
+// drizzleTypeToSQL converts Drizzle column types to SQL types
+func (r *Reader) drizzleTypeToSQL(drizzleType string) string {
+	typeMap := map[string]string{
+		// Integer types
+		"integer":  "integer",
+		"bigint":   "bigint",
+		"smallint": "smallint",
+
+		// Serial types
+		"serial":      "serial",
+		"bigserial":   "bigserial",
+		"smallserial": "smallserial",
+
+		// Numeric types
+		"numeric":         "numeric",
+		"real":            "real",
+		"doublePrecision": "double precision",
+
+		// Character types
+		"text":    "text",
+		"varchar": "varchar",
+		"char":    "char",
+
+		// Boolean
+		"boolean": "boolean",
+
+		// Binary
+		"bytea": "bytea",
+
+		// JSON
+		"json":  "json",
+		"jsonb": "jsonb",
+
+		// Date/Time
+		"time":      "time",
+		"timestamp": "timestamp",
+		"date":      "date",
+		"interval":  "interval",
+
+		// UUID
+		"uuid": "uuid",
+
+		// Geometric
+		"point": "point",
+		"line":  "line",
+	}
+
+	if sqlType, ok := typeMap[drizzleType]; ok {
+		return sqlType
+	}
+
+	// If not found, might be an enum - return as-is
+	return drizzleType
+}
+
+// parseColumnModifiers parses column modifiers like .primaryKey(), .notNull(), etc.
+func (r *Reader) parseColumnModifiers(line string, column *models.Column, table *models.Table) {
+	// Check for .primaryKey()
+	if strings.Contains(line, ".primaryKey()") {
+		column.IsPrimaryKey = true
+		column.NotNull = true
+	}
+
+	// Check for .notNull()
+	if strings.Contains(line, ".notNull()") {
+		column.NotNull = true
+	}
+
+	// Check for .unique()
+	if strings.Contains(line, ".unique()") {
+		uniqueConstraint := models.InitConstraint(
+			fmt.Sprintf("uq_%s", column.Name),
+			models.UniqueConstraint,
+		)
+		uniqueConstraint.Schema = table.Schema
+		uniqueConstraint.Table = table.Name
+		uniqueConstraint.Columns = []string{column.Name}
+		table.Constraints[uniqueConstraint.Name] = uniqueConstraint
+	}
+
+	// Check for .default(...)
+	// Need to handle nested backticks and parentheses in SQL expressions
+	defaultIdx := strings.Index(line, ".default(")
+	if defaultIdx != -1 {
+		start := defaultIdx + len(".default(")
+		depth := 1
+		inBacktick := false
+		i := start
+
+		for i < len(line) && depth > 0 {
+			ch := line[i]
+			if ch == '`' {
+				inBacktick = !inBacktick
+			} else if !inBacktick {
+				switch ch {
+				case '(':
+					depth++
+				case ')':
+					depth--
+				}
+			}
+			i++
+		}
+
+		if depth == 0 {
+			defaultValue := strings.TrimSpace(line[start : i-1])
+			r.parseDefaultValue(defaultValue, column)
+		}
+	}
+
+	// Check for .generatedAlwaysAsIdentity()
+	if strings.Contains(line, ".generatedAlwaysAsIdentity()") {
+		column.AutoIncrement = true
+	}
+
+	// Check for .references(() => otherTable.column)
+	referencesRegex := regexp.MustCompile(`\.references\(\(\)\s*=>\s*(\w+)\.(\w+)\)`)
+	if matches := referencesRegex.FindStringSubmatch(line); matches != nil {
+		refTableVar := matches[1]
+		refColumn := matches[2]
+
+		// Create FK constraint
+		constraintName := fmt.Sprintf("fk_%s_%s", table.Name, column.Name)
+		constraint := models.InitConstraint(constraintName, models.ForeignKeyConstraint)
+		constraint.Schema = table.Schema
+		constraint.Table = table.Name
+		constraint.Columns = []string{column.Name}
+		constraint.ReferencedSchema = table.Schema // Assume same schema
+		constraint.ReferencedTable = r.varNameToTableName(refTableVar)
+		constraint.ReferencedColumns = []string{refColumn}
+
+		table.Constraints[constraint.Name] = constraint
+	}
+}
+
+// parseDefaultValue parses a default value expression
+func (r *Reader) parseDefaultValue(defaultExpr string, column *models.Column) {
+	defaultExpr = strings.TrimSpace(defaultExpr)
+
+	// Handle SQL expressions like sql`now()`
+	sqlRegex := regexp.MustCompile("sql`([^`]+)`")
+	if match := sqlRegex.FindStringSubmatch(defaultExpr); match != nil {
+		column.Default = match[1]
+		return
+	}
+
+	// Handle boolean values
+	if defaultExpr == "true" {
+		column.Default = true
+		return
+	}
+	if defaultExpr == "false" {
+		column.Default = false
+		return
+	}
+
+	// Handle string literals
+	if strings.HasPrefix(defaultExpr, "'") && strings.HasSuffix(defaultExpr, "'") {
+		column.Default = defaultExpr[1 : len(defaultExpr)-1]
+		return
+	}
+	if strings.HasPrefix(defaultExpr, "\"") && strings.HasSuffix(defaultExpr, "\"") {
+		column.Default = defaultExpr[1 : len(defaultExpr)-1]
+		return
+	}
+
+	// Try to parse as number
+	column.Default = defaultExpr
+}
+
+// parseIndexBlock parses the index callback block
+func (r *Reader) parseIndexBlock(block string, table *models.Table, tableVarName string) {
+	// Split by lines
+	lines := strings.Split(block, "\n")
+
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed == "" || strings.HasPrefix(trimmed, "//") {
+			continue
+		}
+
+		// Match: index('index_name').on(table.col1, table.col2)
+		// or: uniqueIndex('index_name').on(table.col1, table.col2)
+		indexRegex := regexp.MustCompile(`(uniqueIndex|index)\s*\(['"](\w+)['"]\)\s*\.on\s*\((.*?)\)`)
+		matches := indexRegex.FindStringSubmatch(trimmed)
+		if matches == nil {
+			continue
+		}
+
+		indexType := matches[1]
+		indexName := matches[2]
+		columnsStr := matches[3]
+
+		// Parse column list
+		columnParts := strings.Split(columnsStr, ",")
+		columns := make([]string, 0)
+		for _, part := range columnParts {
+			// Remove table prefix: table.column -> column
+			cleaned := strings.TrimSpace(part)
+			if strings.Contains(cleaned, ".") {
+				parts := strings.Split(cleaned, ".")
+				cleaned = parts[len(parts)-1]
+			}
+			columns = append(columns, cleaned)
+		}
+
+		if indexType == "uniqueIndex" {
+			// Create unique constraint
+			constraint := models.InitConstraint(indexName, models.UniqueConstraint)
+			constraint.Schema = table.Schema
+			constraint.Table = table.Name
+			constraint.Columns = columns
+			table.Constraints[constraint.Name] = constraint
+		} else {
+			// Create index
+			index := models.InitIndex(indexName, table.Name, table.Schema)
+			index.Columns = columns
+			index.Unique = false
+			table.Indexes[index.Name] = index
+		}
+	}
+}
+
+// varNameToTableName converts a variable name to a table name
+// For now, just return as-is (could add inflection later)
+func (r *Reader) varNameToTableName(varName string) string {
+	// TODO: Could add conversion logic here if needed
+	// For now, assume variable name matches table name
+	return varName
+}

pkg/readers/gorm/README.md

@@ -0,0 +1,141 @@
+# GORM Reader
+
+Reads Go source files containing GORM model definitions and extracts database schema information.
+
+## Overview
+
+The GORM Reader parses Go source code files that define GORM models (structs with `gorm` struct tags) and converts them into RelSpec's internal database model representation. It supports reading from individual files or entire directories.
+
+## Features
+
+- Parses GORM struct tags to extract column definitions
+- Extracts table names from `TableName()` methods
+- Identifies primary keys, foreign keys, and indexes
+- Supports relationship detection (has-many, belongs-to)
+- Handles both single files and directories
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/gorm"
+)
+
+func main() {
+    // Read from a single file
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/models.go",
+    }
+
+    reader := gorm.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### Reading from Directory
+
+```go
+// Read all .go files from a directory
+options := &readers.ReaderOptions{
+    FilePath: "/path/to/models/",
+}
+
+reader := gorm.NewReader(options)
+db, err := reader.ReadDatabase()
+if err != nil {
+    panic(err)
+}
+```
+
+### CLI Example
+
+```bash
+# Read GORM models and convert to JSON
+relspec --input gorm --in-file models/ --output json --out-file schema.json
+
+# Convert GORM models to Bun
+relspec --input gorm --in-file models.go --output bun --out-file bun_models.go
+```
+
+## Supported GORM Tags
+
+The reader recognizes the following GORM struct tags:
+
+- `column` - Column name
+- `type` - SQL data type (e.g., `varchar(255)`, `bigint`)
+- `primaryKey` or `primary_key` - Mark as primary key
+- `not null` - NOT NULL constraint
+- `autoIncrement` - Auto-increment column
+- `default` - Default value
+- `size` - Column size/length
+- `index` - Create index
+- `uniqueIndex` - Create unique index
+- `unique` - Unique constraint
+- `foreignKey` - Foreign key column
+- `references` - Referenced column
+- `constraint` - Constraint behavior (OnDelete, OnUpdate)
+
+## Example GORM Model
+
+```go
+package models
+
+import (
+    "time"
+    "gorm.io/gorm"
+)
+
+type ModelUser struct {
+    gorm.Model
+    ID        int64  `gorm:"column:id;type:bigint;primaryKey;autoIncrement"`
+    Username  string `gorm:"column:username;type:varchar(50);not null;uniqueIndex"`
+    Email     string `gorm:"column:email;type:varchar(100);not null"`
+    CreatedAt time.Time `gorm:"column:created_at;type:timestamp;not null;default:now()"`
+
+    // Relationships
+    Posts []*ModelPost `gorm:"foreignKey:UserID;references:ID;constraint:OnDelete:CASCADE"`
+}
+
+func (ModelUser) TableName() string {
+    return "public.users"
+}
+
+type ModelPost struct {
+    ID        int64  `gorm:"column:id;type:bigint;primaryKey"`
+    UserID    int64  `gorm:"column:user_id;type:bigint;not null"`
+    Title     string `gorm:"column:title;type:varchar(200);not null"`
+    Content   string `gorm:"column:content;type:text"`
+
+    // Belongs-to relationship
+    User *ModelUser `gorm:"foreignKey:UserID;references:ID"`
+}
+
+func (ModelPost) TableName() string {
+    return "public.posts"
+}
+```
+
+## Notes
+
+- Test files (ending in `_test.go`) are automatically excluded
+- The `gorm.Model` embedded struct is automatically recognized and skipped
+- Table names are derived from struct names if `TableName()` method is not present
+- Schema defaults to `public` if not specified in `TableName()`
+- Relationships are inferred from GORM relationship tags
+
+## Limitations
+
+- Complex relationship types (many-to-many with join tables) may need manual verification
+- Custom GORM types may not be fully supported
+- Some advanced GORM features may not be captured

pkg/readers/gorm/reader.go

@@ -693,7 +693,7 @@ func (r *Reader) deriveTableName(structName string) string {
 
 // parseColumn parses a struct field into a Column model
 // Returns the column and any inline reference information (e.g., "mainaccount(id_mainaccount)")
-func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, sequence uint) (*models.Column, string) {
+func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, sequence uint) (col *models.Column, ref string) {
 	// Extract gorm tag
 	gormTag := r.extractGormTag(tag)
 	if gormTag == "" {
@@ -756,20 +756,14 @@ func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, s
 	// - explicit "not null" tag means NOT NULL
 	// - absence of "not null" tag with sql_types means nullable
 	// - primitive types (string, int64, bool) default to NOT NULL unless explicitly nullable
+	// Primary keys are always NOT NULL
+	column.NotNull = false
 	if _, hasNotNull := parts["not null"]; hasNotNull {
 		column.NotNull = true
 	} else {
-		// If no explicit "not null" tag, check the Go type
+		// sql_types.SqlString, etc. are nullable by default
-		if r.isNullableGoType(fieldType) {
+		column.NotNull = !r.isNullableGoType(fieldType)
-			// sql_types.SqlString, etc. are nullable by default
-			column.NotNull = false
-		} else {
-			// Primitive types default to NOT NULL
-			column.NotNull = false // Default to nullable unless explicitly set
-		}
 	}
-
-	// Primary keys are always NOT NULL
 	if column.IsPrimaryKey {
 		column.NotNull = true
 	}

pkg/readers/gorm/reader_test.go

@@ -0,0 +1,464 @@
+package gorm
+
+import (
+	"path/filepath"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+func TestReader_ReadDatabase_Simple(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "gorm", "simple.go"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	schema := db.Schemas[0]
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	if len(schema.Tables) != 1 {
+		t.Fatalf("Expected 1 table, got %d", len(schema.Tables))
+	}
+
+	table := schema.Tables[0]
+	if table.Name != "users" {
+		t.Errorf("Expected table name 'users', got '%s'", table.Name)
+	}
+
+	if len(table.Columns) != 6 {
+		t.Errorf("Expected 6 columns, got %d", len(table.Columns))
+	}
+
+	// Verify id column - primary key should be NOT NULL
+	idCol, exists := table.Columns["id"]
+	if !exists {
+		t.Fatal("Column 'id' not found")
+	}
+	if !idCol.IsPrimaryKey {
+		t.Error("Column 'id' should be primary key")
+	}
+	if !idCol.AutoIncrement {
+		t.Error("Column 'id' should be auto-increment")
+	}
+	if !idCol.NotNull {
+		t.Error("Column 'id' should be NOT NULL (primary keys are always NOT NULL)")
+	}
+	if idCol.Type != "bigint" {
+		t.Errorf("Expected id type 'bigint', got '%s'", idCol.Type)
+	}
+
+	// Verify email column - explicit "not null" tag should be NOT NULL
+	emailCol, exists := table.Columns["email"]
+	if !exists {
+		t.Fatal("Column 'email' not found")
+	}
+	if !emailCol.NotNull {
+		t.Error("Column 'email' should be NOT NULL (explicit 'not null' tag)")
+	}
+	if emailCol.Type != "varchar" || emailCol.Length != 255 {
+		t.Errorf("Expected email type 'varchar(255)', got '%s' with length %d", emailCol.Type, emailCol.Length)
+	}
+
+	// Verify name column - primitive string type should be NOT NULL by default
+	nameCol, exists := table.Columns["name"]
+	if !exists {
+		t.Fatal("Column 'name' not found")
+	}
+	if !nameCol.NotNull {
+		t.Error("Column 'name' should be NOT NULL (primitive string type defaults to NOT NULL)")
+	}
+	if nameCol.Type != "text" {
+		t.Errorf("Expected name type 'text', got '%s'", nameCol.Type)
+	}
+
+	// Verify age column - pointer type should be nullable (NOT NULL = false)
+	ageCol, exists := table.Columns["age"]
+	if !exists {
+		t.Fatal("Column 'age' not found")
+	}
+	if ageCol.NotNull {
+		t.Error("Column 'age' should be nullable (pointer type *int)")
+	}
+	if ageCol.Type != "integer" {
+		t.Errorf("Expected age type 'integer', got '%s'", ageCol.Type)
+	}
+
+	// Verify is_active column - primitive bool type should be NOT NULL by default
+	isActiveCol, exists := table.Columns["is_active"]
+	if !exists {
+		t.Fatal("Column 'is_active' not found")
+	}
+	if !isActiveCol.NotNull {
+		t.Error("Column 'is_active' should be NOT NULL (primitive bool type defaults to NOT NULL)")
+	}
+	if isActiveCol.Type != "boolean" {
+		t.Errorf("Expected is_active type 'boolean', got '%s'", isActiveCol.Type)
+	}
+
+	// Verify created_at column - time.Time should be NOT NULL by default
+	createdAtCol, exists := table.Columns["created_at"]
+	if !exists {
+		t.Fatal("Column 'created_at' not found")
+	}
+	if !createdAtCol.NotNull {
+		t.Error("Column 'created_at' should be NOT NULL (time.Time is NOT NULL by default)")
+	}
+	if createdAtCol.Type != "timestamp" {
+		t.Errorf("Expected created_at type 'timestamp', got '%s'", createdAtCol.Type)
+	}
+	if createdAtCol.Default != "now()" {
+		t.Errorf("Expected created_at default 'now()', got '%v'", createdAtCol.Default)
+	}
+}
+
+func TestReader_ReadDatabase_Complex(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "gorm", "complex.go"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Verify schema
+	if len(db.Schemas) != 1 {
+		t.Fatalf("Expected 1 schema, got %d", len(db.Schemas))
+	}
+
+	schema := db.Schemas[0]
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	// Verify tables
+	if len(schema.Tables) != 3 {
+		t.Fatalf("Expected 3 tables, got %d", len(schema.Tables))
+	}
+
+	// Find tables
+	var usersTable, postsTable, commentsTable *models.Table
+	for _, table := range schema.Tables {
+		switch table.Name {
+		case "users":
+			usersTable = table
+		case "posts":
+			postsTable = table
+		case "comments":
+			commentsTable = table
+		}
+	}
+
+	if usersTable == nil {
+		t.Fatal("Users table not found")
+	}
+	if postsTable == nil {
+		t.Fatal("Posts table not found")
+	}
+	if commentsTable == nil {
+		t.Fatal("Comments table not found")
+	}
+
+	// Verify users table - test NOT NULL logic for various field types
+	if len(usersTable.Columns) != 10 {
+		t.Errorf("Expected 10 columns in users table, got %d", len(usersTable.Columns))
+	}
+
+	// username - NOT NULL (explicit tag)
+	usernameCol, exists := usersTable.Columns["username"]
+	if !exists {
+		t.Fatal("Column 'username' not found")
+	}
+	if !usernameCol.NotNull {
+		t.Error("Column 'username' should be NOT NULL (explicit 'not null' tag)")
+	}
+
+	// first_name - nullable (pointer type)
+	firstNameCol, exists := usersTable.Columns["first_name"]
+	if !exists {
+		t.Fatal("Column 'first_name' not found")
+	}
+	if firstNameCol.NotNull {
+		t.Error("Column 'first_name' should be nullable (pointer type *string)")
+	}
+
+	// last_name - nullable (pointer type)
+	lastNameCol, exists := usersTable.Columns["last_name"]
+	if !exists {
+		t.Fatal("Column 'last_name' not found")
+	}
+	if lastNameCol.NotNull {
+		t.Error("Column 'last_name' should be nullable (pointer type *string)")
+	}
+
+	// bio - nullable (pointer type)
+	bioCol, exists := usersTable.Columns["bio"]
+	if !exists {
+		t.Fatal("Column 'bio' not found")
+	}
+	if bioCol.NotNull {
+		t.Error("Column 'bio' should be nullable (pointer type *string)")
+	}
+
+	// is_active - NOT NULL (primitive bool)
+	isActiveCol, exists := usersTable.Columns["is_active"]
+	if !exists {
+		t.Fatal("Column 'is_active' not found")
+	}
+	if !isActiveCol.NotNull {
+		t.Error("Column 'is_active' should be NOT NULL (primitive bool type)")
+	}
+
+	// Verify users table indexes
+	if len(usersTable.Indexes) < 1 {
+		t.Error("Expected at least 1 index on users table")
+	}
+
+	// Verify posts table
+	if len(postsTable.Columns) != 11 {
+		t.Errorf("Expected 11 columns in posts table, got %d", len(postsTable.Columns))
+	}
+
+	// excerpt - nullable (pointer type)
+	excerptCol, exists := postsTable.Columns["excerpt"]
+	if !exists {
+		t.Fatal("Column 'excerpt' not found")
+	}
+	if excerptCol.NotNull {
+		t.Error("Column 'excerpt' should be nullable (pointer type *string)")
+	}
+
+	// published - NOT NULL (primitive bool with default)
+	publishedCol, exists := postsTable.Columns["published"]
+	if !exists {
+		t.Fatal("Column 'published' not found")
+	}
+	if !publishedCol.NotNull {
+		t.Error("Column 'published' should be NOT NULL (primitive bool type)")
+	}
+	if publishedCol.Default != "false" {
+		t.Errorf("Expected published default 'false', got '%v'", publishedCol.Default)
+	}
+
+	// published_at - nullable (pointer to time.Time)
+	publishedAtCol, exists := postsTable.Columns["published_at"]
+	if !exists {
+		t.Fatal("Column 'published_at' not found")
+	}
+	if publishedAtCol.NotNull {
+		t.Error("Column 'published_at' should be nullable (pointer type *time.Time)")
+	}
+
+	// view_count - NOT NULL (primitive int64 with default)
+	viewCountCol, exists := postsTable.Columns["view_count"]
+	if !exists {
+		t.Fatal("Column 'view_count' not found")
+	}
+	if !viewCountCol.NotNull {
+		t.Error("Column 'view_count' should be NOT NULL (primitive int64 type)")
+	}
+	if viewCountCol.Default != "0" {
+		t.Errorf("Expected view_count default '0', got '%v'", viewCountCol.Default)
+	}
+
+	// Verify posts table indexes
+	if len(postsTable.Indexes) < 1 {
+		t.Error("Expected at least 1 index on posts table")
+	}
+
+	// Verify comments table
+	if len(commentsTable.Columns) != 6 {
+		t.Errorf("Expected 6 columns in comments table, got %d", len(commentsTable.Columns))
+	}
+
+	// user_id - nullable (pointer type)
+	userIDCol, exists := commentsTable.Columns["user_id"]
+	if !exists {
+		t.Fatal("Column 'user_id' not found in comments table")
+	}
+	if userIDCol.NotNull {
+		t.Error("Column 'user_id' should be nullable (pointer type *int64)")
+	}
+
+	// post_id - NOT NULL (explicit tag)
+	postIDCol, exists := commentsTable.Columns["post_id"]
+	if !exists {
+		t.Fatal("Column 'post_id' not found in comments table")
+	}
+	if !postIDCol.NotNull {
+		t.Error("Column 'post_id' should be NOT NULL (explicit 'not null' tag)")
+	}
+
+	// Verify foreign key constraints
+	if len(postsTable.Constraints) == 0 {
+		t.Error("Expected at least one constraint on posts table")
+	}
+
+	// Find FK constraint to users
+	var fkPostsUser *models.Constraint
+	for _, c := range postsTable.Constraints {
+		if c.Type == models.ForeignKeyConstraint && c.ReferencedTable == "users" {
+			fkPostsUser = c
+			break
+		}
+	}
+
+	if fkPostsUser != nil {
+		if fkPostsUser.OnDelete != "CASCADE" {
+			t.Errorf("Expected ON DELETE CASCADE for posts->users FK, got '%s'", fkPostsUser.OnDelete)
+		}
+		if fkPostsUser.OnUpdate != "CASCADE" {
+			t.Errorf("Expected ON UPDATE CASCADE for posts->users FK, got '%s'", fkPostsUser.OnUpdate)
+		}
+	}
+
+	// Verify comments table constraints
+	if len(commentsTable.Constraints) == 0 {
+		t.Error("Expected at least one constraint on comments table")
+	}
+
+	// Find FK constraints
+	var fkCommentsPost, fkCommentsUser *models.Constraint
+	for _, c := range commentsTable.Constraints {
+		if c.Type == models.ForeignKeyConstraint {
+			if c.ReferencedTable == "posts" {
+				fkCommentsPost = c
+			} else if c.ReferencedTable == "users" {
+				fkCommentsUser = c
+			}
+		}
+	}
+
+	if fkCommentsPost != nil {
+		if fkCommentsPost.OnDelete != "CASCADE" {
+			t.Errorf("Expected ON DELETE CASCADE for comments->posts FK, got '%s'", fkCommentsPost.OnDelete)
+		}
+	}
+
+	if fkCommentsUser != nil {
+		if fkCommentsUser.OnDelete != "SET NULL" {
+			t.Errorf("Expected ON DELETE SET NULL for comments->users FK, got '%s'", fkCommentsUser.OnDelete)
+		}
+	}
+}
+
+func TestReader_ReadSchema(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "gorm", "simple.go"),
+	}
+
+	reader := NewReader(opts)
+	schema, err := reader.ReadSchema()
+	if err != nil {
+		t.Fatalf("ReadSchema() error = %v", err)
+	}
+
+	if schema == nil {
+		t.Fatal("ReadSchema() returned nil schema")
+	}
+
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	if len(schema.Tables) != 1 {
+		t.Errorf("Expected 1 table, got %d", len(schema.Tables))
+	}
+}
+
+func TestReader_ReadTable(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "gorm", "simple.go"),
+	}
+
+	reader := NewReader(opts)
+	table, err := reader.ReadTable()
+	if err != nil {
+		t.Fatalf("ReadTable() error = %v", err)
+	}
+
+	if table == nil {
+		t.Fatal("ReadTable() returned nil table")
+	}
+
+	if table.Name != "users" {
+		t.Errorf("Expected table name 'users', got '%s'", table.Name)
+	}
+
+	if len(table.Columns) != 6 {
+		t.Errorf("Expected 6 columns, got %d", len(table.Columns))
+	}
+}
+
+func TestReader_ReadDatabase_Directory(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "gorm"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Should read both simple.go and complex.go
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	schema := db.Schemas[0]
+	// Should have at least 3 tables from complex.go (users, posts, comments)
+	// plus 1 from simple.go (users) - but same table name, so may be overwritten
+	if len(schema.Tables) < 3 {
+		t.Errorf("Expected at least 3 tables, got %d", len(schema.Tables))
+	}
+}
+
+func TestReader_ReadDatabase_InvalidPath(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: "/nonexistent/file.go",
+	}
+
+	reader := NewReader(opts)
+	_, err := reader.ReadDatabase()
+	if err == nil {
+		t.Error("Expected error for invalid file path")
+	}
+}
+
+func TestReader_ReadDatabase_EmptyPath(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: "",
+	}
+
+	reader := NewReader(opts)
+	_, err := reader.ReadDatabase()
+	if err == nil {
+		t.Error("Expected error for empty file path")
+	}
+}

pkg/readers/graphql/README.md

@@ -0,0 +1,203 @@
+# GraphQL Schema Reader
+
+The GraphQL reader parses GraphQL Schema Definition Language (SDL) files and converts them into RelSpec's internal database model.
+
+## Features
+
+- **Standard GraphQL SDL** support (generic, non-framework-specific)
+- **Type to Table mapping**: GraphQL types become database tables
+- **Field to Column mapping**: GraphQL fields become table columns
+- **Enum support**: GraphQL enums are preserved
+- **Custom scalars**: DateTime, JSON, Date automatically mapped to appropriate SQL types
+- **Implicit relationships**: Detects relationships from field types
+- **Many-to-many support**: Creates junction tables for bidirectional array relationships
+- **Configurable ID mapping**: Choose between bigint (default) or UUID for ID fields
+
+## Supported GraphQL Features
+
+### Built-in Scalars
+- `ID` → bigint (default) or uuid (configurable)
+- `String` → text
+- `Int` → integer
+- `Float` → double precision
+- `Boolean` → boolean
+
+### Custom Scalars
+- `DateTime` → timestamp
+- `JSON` → jsonb
+- `Date` → date
+- `Time` → time
+- `Decimal` → numeric
+
+Additional custom scalars can be mapped via metadata.
+
+### Relationships
+
+Relationships are inferred from field types:
+
+```graphql
+type Post {
+  id: ID!
+  title: String!
+  author: User!        # Many-to-one (creates authorId FK column, NOT NULL)
+  reviewer: User       # Many-to-one nullable (creates reviewerId FK column, NULL)
+  tags: [Tag!]!        # One-to-many or many-to-many (depending on reverse)
+}
+
+type User {
+  id: ID!
+  posts: [Post!]!      # Reverse of Post.author (no FK created)
+}
+
+type Tag {
+  id: ID!
+  posts: [Post!]!      # Many-to-many with Post (creates PostTag junction table)
+}
+```
+
+**Relationship Detection Rules:**
+- Single type reference (`user: User`) → Creates FK column (e.g., `userId`)
+- Array type reference (`posts: [Post!]!`) → One-to-many reverse (no FK on this table)
+- Bidirectional arrays → Many-to-many (creates junction table)
+
+### Enums
+
+```graphql
+enum Role {
+  ADMIN
+  USER
+  GUEST
+}
+
+type User {
+  role: Role!
+}
+```
+
+Enums are preserved in the schema and can be used as column types.
+
+## Usage
+
+### Basic Usage
+
+```go
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/graphql"
+)
+
+opts := &readers.ReaderOptions{
+    FilePath: "schema.graphql",
+}
+
+reader := graphql.NewReader(opts)
+db, err := reader.ReadDatabase()
+```
+
+### With UUID ID Type
+
+```go
+opts := &readers.ReaderOptions{
+    FilePath: "schema.graphql",
+    Metadata: map[string]interface{}{
+        "idType": "uuid",  // Map ID scalar to uuid instead of bigint
+    },
+}
+
+reader := graphql.NewReader(opts)
+db, err := reader.ReadDatabase()
+```
+
+### With Per-Type ID Mapping
+
+```go
+opts := &readers.ReaderOptions{
+    FilePath: "schema.graphql",
+    Metadata: map[string]interface{}{
+        "typeIdMappings": map[string]string{
+            "User": "uuid",    // User.id → uuid
+            "Post": "bigint",  // Post.id → bigint
+        },
+    },
+}
+```
+
+### With Custom Scalar Mappings
+
+```go
+opts := &readers.ReaderOptions{
+    FilePath: "schema.graphql",
+    Metadata: map[string]interface{}{
+        "customScalarMappings": map[string]string{
+            "Upload":  "bytea",
+            "Decimal": "numeric(10,2)",
+        },
+    },
+}
+```
+
+## CLI Usage
+
+```bash
+# Convert GraphQL to JSON
+relspec convert --from graphql --from-path schema.graphql \
+                --to json --to-path schema.json
+
+# Convert GraphQL to GORM models
+relspec convert --from graphql --from-path schema.graphql \
+                --to gorm --to-path models/ --package models
+
+# Convert GraphQL to PostgreSQL SQL
+relspec convert --from graphql --from-path schema.graphql \
+                --to pgsql --to-path schema.sql
+```
+
+## Metadata Options
+
+| Option | Type | Description | Default |
+|--------|------|-------------|---------|
+| `idType` | string | Global ID type mapping ("bigint" or "uuid") | "bigint" |
+| `typeIdMappings` | map[string]string | Per-type ID mappings | {} |
+| `customScalarMappings` | map[string]string | Custom scalar to SQL type mappings | {} |
+| `schemaName` | string | Schema name for all tables | "public" |
+
+## Limitations
+
+- Only supports GraphQL SDL (Schema Definition Language), not queries or mutations
+- Directives are ignored (except for future extensibility)
+- Interfaces and Unions are not supported
+- GraphQL's concept of "schema" is different from database schemas; all types go into a single database schema (default: "public")
+
+## Example
+
+**Input** (`schema.graphql`):
+```graphql
+scalar DateTime
+
+enum Role {
+  ADMIN
+  USER
+}
+
+type User {
+  id: ID!
+  email: String!
+  role: Role!
+  createdAt: DateTime!
+  posts: [Post!]!
+}
+
+type Post {
+  id: ID!
+  title: String!
+  content: String
+  published: Boolean!
+  author: User!
+}
+```
+
+**Result**: Database with:
+- 2 tables: `User` and `Post`
+- `Post` table has `authorId` foreign key to `User.id`
+- `Role` enum with values: ADMIN, USER
+- Custom scalar `DateTime` mapped to `timestamp`

pkg/readers/graphql/reader.go

@@ -0,0 +1,279 @@
+package graphql
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+type Reader struct {
+	options *readers.ReaderOptions
+}
+
+func NewReader(options *readers.ReaderOptions) *Reader {
+	return &Reader{
+		options: options,
+	}
+}
+
+func (r *Reader) ReadDatabase() (*models.Database, error) {
+	if r.options.FilePath == "" {
+		return nil, fmt.Errorf("file path is required for GraphQL reader")
+	}
+
+	content, err := os.ReadFile(r.options.FilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read file: %w", err)
+	}
+
+	return r.parseGraphQL(string(content))
+}
+
+func (r *Reader) ReadSchema() (*models.Schema, error) {
+	db, err := r.ReadDatabase()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(db.Schemas) == 0 {
+		return nil, fmt.Errorf("no schemas found")
+	}
+
+	return db.Schemas[0], nil
+}
+
+func (r *Reader) ReadTable() (*models.Table, error) {
+	schema, err := r.ReadSchema()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(schema.Tables) == 0 {
+		return nil, fmt.Errorf("no tables found")
+	}
+
+	return schema.Tables[0], nil
+}
+
+type parseContext struct {
+	inType        bool
+	inEnum        bool
+	currentType   string
+	typeLines     []string
+	currentEnum   string
+	enumLines     []string
+	customScalars map[string]bool
+}
+
+func (r *Reader) parseGraphQL(content string) (*models.Database, error) {
+	dbName := "database"
+	if r.options.Metadata != nil {
+		if name, ok := r.options.Metadata["name"].(string); ok {
+			dbName = name
+		}
+	}
+
+	db := models.InitDatabase(dbName)
+	schema := models.InitSchema("public")
+
+	ctx := &parseContext{
+		customScalars: make(map[string]bool),
+	}
+
+	// First pass: collect custom scalars and enums
+	scanner := bufio.NewScanner(strings.NewReader(content))
+	scalarRegex := regexp.MustCompile(`^\s*scalar\s+(\w+)`)
+	enumRegex := regexp.MustCompile(`^\s*enum\s+(\w+)\s*\{`)
+	closingBraceRegex := regexp.MustCompile(`^\s*\}`)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		trimmed := strings.TrimSpace(line)
+
+		if trimmed == "" || strings.HasPrefix(trimmed, "#") {
+			continue
+		}
+
+		if matches := scalarRegex.FindStringSubmatch(trimmed); matches != nil {
+			ctx.customScalars[matches[1]] = true
+			continue
+		}
+
+		if matches := enumRegex.FindStringSubmatch(trimmed); matches != nil {
+			ctx.inEnum = true
+			ctx.currentEnum = matches[1]
+			ctx.enumLines = []string{}
+			continue
+		}
+
+		if closingBraceRegex.MatchString(trimmed) && ctx.inEnum {
+			r.parseEnum(ctx.currentEnum, ctx.enumLines, schema)
+			// Add enum name to custom scalars for type detection
+			ctx.customScalars[ctx.currentEnum] = true
+			ctx.inEnum = false
+			ctx.currentEnum = ""
+			ctx.enumLines = nil
+			continue
+		}
+
+		if ctx.inEnum {
+			ctx.enumLines = append(ctx.enumLines, line)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, fmt.Errorf("scanner error: %w", err)
+	}
+
+	// Second pass: parse types
+	scanner = bufio.NewScanner(strings.NewReader(content))
+	typeRegex := regexp.MustCompile(`^\s*type\s+(\w+)\s*\{`)
+	ctx.inType = false
+	ctx.inEnum = false
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		trimmed := strings.TrimSpace(line)
+
+		if trimmed == "" || strings.HasPrefix(trimmed, "#") {
+			continue
+		}
+
+		if matches := typeRegex.FindStringSubmatch(trimmed); matches != nil {
+			ctx.inType = true
+			ctx.currentType = matches[1]
+			ctx.typeLines = []string{}
+			continue
+		}
+
+		if closingBraceRegex.MatchString(trimmed) && ctx.inType {
+			if err := r.parseType(ctx.currentType, ctx.typeLines, schema, ctx); err != nil {
+				return nil, fmt.Errorf("failed to parse type %s: %w", ctx.currentType, err)
+			}
+			ctx.inType = false
+			ctx.currentType = ""
+			ctx.typeLines = nil
+			continue
+		}
+
+		if ctx.inType {
+			ctx.typeLines = append(ctx.typeLines, line)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, fmt.Errorf("scanner error: %w", err)
+	}
+
+	db.Schemas = []*models.Schema{schema}
+
+	// Third pass: detect and create relationships
+	if err := r.detectAndCreateRelationships(schema, ctx); err != nil {
+		return nil, fmt.Errorf("failed to create relationships: %w", err)
+	}
+
+	return db, nil
+}
+
+type fieldInfo struct {
+	name          string
+	typeName      string
+	isArray       bool
+	isNullable    bool
+	innerNullable bool
+}
+
+func (r *Reader) parseType(typeName string, lines []string, schema *models.Schema, ctx *parseContext) error {
+	table := models.InitTable(typeName, schema.Name)
+	table.Metadata = make(map[string]any)
+
+	// Store field info for relationship detection
+	relationFields := make(map[string]*fieldInfo)
+
+	fieldRegex := regexp.MustCompile(`^\s*(\w+)\s*:\s*(\[)?(\w+)(!)?(\])?(!)?\s*`)
+
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed == "" || strings.HasPrefix(trimmed, "#") {
+			continue
+		}
+
+		matches := fieldRegex.FindStringSubmatch(trimmed)
+		if matches == nil {
+			continue
+		}
+
+		fieldName := matches[1]
+		hasOpenBracket := matches[2] == "["
+		baseType := matches[3]
+		innerNonNull := matches[4] == "!"
+		hasCloseBracket := matches[5] == "]"
+		outerNonNull := matches[6] == "!"
+
+		isArray := hasOpenBracket && hasCloseBracket
+
+		// Determine if this is a scalar or a relation
+		if r.isScalarType(baseType, ctx) {
+			// This is a scalar field
+			column := models.InitColumn(fieldName, table.Name, schema.Name)
+			column.Type = r.graphQLTypeToSQL(baseType, fieldName, typeName)
+
+			if isArray {
+				// Array of scalars: use array type
+				column.Type += "[]"
+				column.NotNull = outerNonNull
+			} else {
+				column.NotNull = !isArray && innerNonNull
+			}
+
+			// Check if this is a primary key (convention: field named "id")
+			if fieldName == "id" {
+				column.IsPrimaryKey = true
+				column.AutoIncrement = true
+			}
+
+			table.Columns[fieldName] = column
+		} else {
+			// This is a relation field - store for later processing
+			relationFields[fieldName] = &fieldInfo{
+				name:          fieldName,
+				typeName:      baseType,
+				isArray:       isArray,
+				isNullable:    !innerNonNull && !isArray,
+				innerNullable: !innerNonNull && isArray,
+			}
+		}
+	}
+
+	// Store relation fields in table metadata for relationship detection
+	if len(relationFields) > 0 {
+		table.Metadata["relationFields"] = relationFields
+	}
+
+	schema.Tables = append(schema.Tables, table)
+	return nil
+}
+
+func (r *Reader) parseEnum(enumName string, lines []string, schema *models.Schema) {
+	enum := &models.Enum{
+		Name:   enumName,
+		Schema: schema.Name,
+		Values: make([]string, 0),
+	}
+
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed == "" || strings.HasPrefix(trimmed, "#") {
+			continue
+		}
+		// Enum values are simple identifiers
+		enum.Values = append(enum.Values, trimmed)
+	}
+
+	schema.Enums = append(schema.Enums, enum)
+}

pkg/readers/graphql/reader_test.go

@@ -0,0 +1,362 @@
+package graphql
+
+import (
+	"path/filepath"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+func TestReader_ReadDatabase_Simple(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "simple.graphql"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	schema := db.Schemas[0]
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	if len(schema.Tables) != 1 {
+		t.Fatalf("Expected 1 table, got %d", len(schema.Tables))
+	}
+
+	userTable := schema.Tables[0]
+	if userTable.Name != "User" {
+		t.Errorf("Expected table name 'User', got '%s'", userTable.Name)
+	}
+
+	// Verify columns
+	expectedColumns := map[string]struct {
+		sqlType string
+		notNull bool
+		isPK    bool
+	}{
+		"id":     {"bigint", true, true},
+		"email":  {"text", true, false},
+		"name":   {"text", false, false},
+		"age":    {"integer", false, false},
+		"active": {"boolean", true, false},
+	}
+
+	if len(userTable.Columns) != len(expectedColumns) {
+		t.Fatalf("Expected %d columns, got %d", len(expectedColumns), len(userTable.Columns))
+	}
+
+	for colName, expected := range expectedColumns {
+		col, exists := userTable.Columns[colName]
+		if !exists {
+			t.Errorf("Expected column '%s' not found", colName)
+			continue
+		}
+
+		if col.Type != expected.sqlType {
+			t.Errorf("Column '%s': expected type '%s', got '%s'", colName, expected.sqlType, col.Type)
+		}
+
+		if col.NotNull != expected.notNull {
+			t.Errorf("Column '%s': expected NotNull=%v, got %v", colName, expected.notNull, col.NotNull)
+		}
+
+		if col.IsPrimaryKey != expected.isPK {
+			t.Errorf("Column '%s': expected IsPrimaryKey=%v, got %v", colName, expected.isPK, col.IsPrimaryKey)
+		}
+	}
+}
+
+func TestReader_ReadDatabase_WithRelations(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "relations.graphql"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	schema := db.Schemas[0]
+
+	if len(schema.Tables) != 2 {
+		t.Fatalf("Expected 2 tables, got %d", len(schema.Tables))
+	}
+
+	// Find Post table (should have FK to User)
+	var postTable *models.Table
+	for _, table := range schema.Tables {
+		if table.Name == "Post" {
+			postTable = table
+			break
+		}
+	}
+
+	if postTable == nil {
+		t.Fatal("Post table not found")
+	}
+
+	// Verify authorId FK column was created
+	authorIdCol, exists := postTable.Columns["authorId"]
+	if !exists {
+		t.Fatal("Expected 'authorId' FK column not found in Post table")
+	}
+
+	if authorIdCol.Type != "bigint" {
+		t.Errorf("Expected authorId type 'bigint', got '%s'", authorIdCol.Type)
+	}
+
+	if !authorIdCol.NotNull {
+		t.Error("Expected authorId to be NOT NULL")
+	}
+
+	// Verify FK constraint
+	fkConstraintFound := false
+	for _, constraint := range postTable.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			if constraint.ReferencedTable == "User" && len(constraint.Columns) > 0 && constraint.Columns[0] == "authorId" {
+				fkConstraintFound = true
+				if constraint.OnDelete != "CASCADE" {
+					t.Errorf("Expected OnDelete CASCADE, got %s", constraint.OnDelete)
+				}
+				break
+			}
+		}
+	}
+
+	if !fkConstraintFound {
+		t.Error("Foreign key constraint from Post to User not found")
+	}
+}
+
+func TestReader_ReadDatabase_WithEnums(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "enums.graphql"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	schema := db.Schemas[0]
+
+	if len(schema.Enums) != 1 {
+		t.Fatalf("Expected 1 enum, got %d", len(schema.Enums))
+	}
+
+	roleEnum := schema.Enums[0]
+	if roleEnum.Name != "Role" {
+		t.Errorf("Expected enum name 'Role', got '%s'", roleEnum.Name)
+	}
+
+	expectedValues := []string{"ADMIN", "USER", "GUEST"}
+	if len(roleEnum.Values) != len(expectedValues) {
+		t.Fatalf("Expected %d enum values, got %d", len(expectedValues), len(roleEnum.Values))
+	}
+
+	for i, expected := range expectedValues {
+		if roleEnum.Values[i] != expected {
+			t.Errorf("Expected enum value '%s' at index %d, got '%s'", expected, i, roleEnum.Values[i])
+		}
+	}
+
+	// Verify role column in User table
+	userTable := schema.Tables[0]
+	roleCol, exists := userTable.Columns["role"]
+	if !exists {
+		t.Fatal("Expected 'role' column not found")
+	}
+
+	if roleCol.Type != "Role" {
+		t.Errorf("Expected role type 'Role', got '%s'", roleCol.Type)
+	}
+}
+
+func TestReader_ReadDatabase_CustomScalars(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "custom_scalars.graphql"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	schema := db.Schemas[0]
+	userTable := schema.Tables[0]
+
+	// Verify custom scalar mappings
+	expectedTypes := map[string]string{
+		"createdAt": "timestamp",
+		"metadata":  "jsonb",
+		"birthDate": "date",
+	}
+
+	for colName, expectedType := range expectedTypes {
+		col, exists := userTable.Columns[colName]
+		if !exists {
+			t.Errorf("Expected column '%s' not found", colName)
+			continue
+		}
+
+		if col.Type != expectedType {
+			t.Errorf("Column '%s': expected type '%s', got '%s'", colName, expectedType, col.Type)
+		}
+	}
+}
+
+func TestReader_ReadDatabase_UUIDMetadata(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "simple.graphql"),
+		Metadata: map[string]interface{}{
+			"idType": "uuid",
+		},
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	schema := db.Schemas[0]
+	userTable := schema.Tables[0]
+
+	idCol, exists := userTable.Columns["id"]
+	if !exists {
+		t.Fatal("Expected 'id' column not found")
+	}
+
+	if idCol.Type != "uuid" {
+		t.Errorf("Expected id type 'uuid' with metadata, got '%s'", idCol.Type)
+	}
+}
+
+func TestReader_ReadDatabase_Complex(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "complex.graphql"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	schema := db.Schemas[0]
+
+	// Should have 5 tables: User, Profile, Post, Tag, and PostTag (join table)
+	expectedTableCount := 5
+	if len(schema.Tables) != expectedTableCount {
+		t.Fatalf("Expected %d tables, got %d", expectedTableCount, len(schema.Tables))
+	}
+
+	// Verify PostTag join table exists (many-to-many between Post and Tag)
+	var joinTable *models.Table
+	for _, table := range schema.Tables {
+		if table.Name == "PostTag" {
+			joinTable = table
+			break
+		}
+	}
+
+	if joinTable == nil {
+		t.Fatal("Expected PostTag join table not found")
+	}
+
+	// Verify join table has both FK columns
+	if _, exists := joinTable.Columns["postId"]; !exists {
+		t.Error("Expected 'postId' column in PostTag join table")
+	}
+
+	if _, exists := joinTable.Columns["tagId"]; !exists {
+		t.Error("Expected 'tagId' column in PostTag join table")
+	}
+
+	// Verify composite primary key
+	pkFound := false
+	for _, constraint := range joinTable.Constraints {
+		if constraint.Type == models.PrimaryKeyConstraint {
+			if len(constraint.Columns) == 2 {
+				pkFound = true
+			}
+			break
+		}
+	}
+
+	if !pkFound {
+		t.Error("Expected composite primary key in PostTag join table")
+	}
+}
+
+func TestReader_ReadSchema(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "simple.graphql"),
+	}
+
+	reader := NewReader(opts)
+	schema, err := reader.ReadSchema()
+	if err != nil {
+		t.Fatalf("ReadSchema() error = %v", err)
+	}
+
+	if schema.Name != "public" {
+		t.Errorf("Expected schema name 'public', got '%s'", schema.Name)
+	}
+
+	if len(schema.Tables) != 1 {
+		t.Errorf("Expected 1 table, got %d", len(schema.Tables))
+	}
+}
+
+func TestReader_ReadTable(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "graphql", "simple.graphql"),
+	}
+
+	reader := NewReader(opts)
+	table, err := reader.ReadTable()
+	if err != nil {
+		t.Fatalf("ReadTable() error = %v", err)
+	}
+
+	if table.Name != "User" {
+		t.Errorf("Expected table name 'User', got '%s'", table.Name)
+	}
+}
+
+func TestReader_InvalidPath(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: "/nonexistent/path.graphql",
+	}
+
+	reader := NewReader(opts)
+	_, err := reader.ReadDatabase()
+	if err == nil {
+		t.Error("Expected error for invalid path, got nil")
+	}
+}
+
+func TestReader_EmptyPath(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: "",
+	}
+
+	reader := NewReader(opts)
+	_, err := reader.ReadDatabase()
+	if err == nil {
+		t.Error("Expected error for empty path, got nil")
+	}
+}

pkg/readers/graphql/relationships.go

@@ -0,0 +1,225 @@
+package graphql
+
+import (
+	"fmt"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+func (r *Reader) detectAndCreateRelationships(schema *models.Schema, ctx *parseContext) error {
+	// Build table lookup map
+	tableMap := make(map[string]*models.Table)
+	for _, table := range schema.Tables {
+		tableMap[table.Name] = table
+	}
+
+	// Process each table's relation fields
+	for _, table := range schema.Tables {
+		relationFields, ok := table.Metadata["relationFields"].(map[string]*fieldInfo)
+		if !ok || len(relationFields) == 0 {
+			continue
+		}
+
+		for fieldName, fieldInfo := range relationFields {
+			targetTable, exists := tableMap[fieldInfo.typeName]
+			if !exists {
+				// Referenced type doesn't exist - might be an interface/union, skip
+				continue
+			}
+
+			if fieldInfo.isArray {
+				// This is a one-to-many or many-to-many reverse side
+				// Check if target table has a reverse array field
+				if r.hasReverseArrayField(targetTable, table.Name) {
+					// Bidirectional array = many-to-many
+					// Only create join table once (lexicographically first table creates it)
+					if table.Name < targetTable.Name {
+						if err := r.createManyToManyJoinTable(schema, table, targetTable, fieldName, tableMap); err != nil {
+							return err
+						}
+					}
+				}
+				// For one-to-many, no action needed (FK is on the other table)
+			} else {
+				// This is a many-to-one or one-to-one
+				// Create FK column on this table
+				if err := r.createForeignKeyColumn(table, targetTable, fieldName, fieldInfo.isNullable, schema); err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	// Clean up metadata
+	for _, table := range schema.Tables {
+		delete(table.Metadata, "relationFields")
+	}
+
+	return nil
+}
+
+func (r *Reader) hasReverseArrayField(table *models.Table, targetTypeName string) bool {
+	relationFields, ok := table.Metadata["relationFields"].(map[string]*fieldInfo)
+	if !ok {
+		return false
+	}
+
+	for _, fieldInfo := range relationFields {
+		if fieldInfo.typeName == targetTypeName && fieldInfo.isArray {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (r *Reader) createForeignKeyColumn(fromTable, toTable *models.Table, fieldName string, nullable bool, schema *models.Schema) error {
+	// Get primary key from target table
+	pkCol := toTable.GetPrimaryKey()
+	if pkCol == nil {
+		return fmt.Errorf("target table %s has no primary key for relationship", toTable.Name)
+	}
+
+	// Create FK column name: {fieldName}Id
+	fkColName := fieldName + "Id"
+
+	// Check if column already exists (shouldn't happen but be safe)
+	if _, exists := fromTable.Columns[fkColName]; exists {
+		return nil
+	}
+
+	// Create FK column
+	fkCol := models.InitColumn(fkColName, fromTable.Name, schema.Name)
+	fkCol.Type = pkCol.Type
+	fkCol.NotNull = !nullable
+
+	fromTable.Columns[fkColName] = fkCol
+
+	// Create FK constraint
+	constraint := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", fromTable.Name, fieldName),
+		models.ForeignKeyConstraint,
+	)
+	constraint.Schema = schema.Name
+	constraint.Table = fromTable.Name
+	constraint.Columns = []string{fkColName}
+	constraint.ReferencedSchema = schema.Name
+	constraint.ReferencedTable = toTable.Name
+	constraint.ReferencedColumns = []string{pkCol.Name}
+	constraint.OnDelete = "CASCADE"
+	constraint.OnUpdate = "RESTRICT"
+
+	fromTable.Constraints[constraint.Name] = constraint
+
+	// Create relationship
+	relationship := models.InitRelationship(
+		fmt.Sprintf("rel_%s_%s", fromTable.Name, fieldName),
+		models.OneToMany,
+	)
+	relationship.FromTable = fromTable.Name
+	relationship.FromSchema = schema.Name
+	relationship.FromColumns = []string{fkColName}
+	relationship.ToTable = toTable.Name
+	relationship.ToSchema = schema.Name
+	relationship.ToColumns = []string{pkCol.Name}
+	relationship.ForeignKey = constraint.Name
+
+	fromTable.Relationships[relationship.Name] = relationship
+
+	return nil
+}
+
+func (r *Reader) createManyToManyJoinTable(schema *models.Schema, table1, table2 *models.Table, fieldName string, tableMap map[string]*models.Table) error {
+	// Create join table name
+	joinTableName := table1.Name + table2.Name
+
+	// Check if join table already exists
+	if _, exists := tableMap[joinTableName]; exists {
+		return nil
+	}
+
+	// Get primary keys
+	pk1 := table1.GetPrimaryKey()
+	pk2 := table2.GetPrimaryKey()
+
+	if pk1 == nil || pk2 == nil {
+		return fmt.Errorf("cannot create many-to-many: tables must have primary keys")
+	}
+
+	// Create join table
+	joinTable := models.InitTable(joinTableName, schema.Name)
+
+	// Create FK column for table1
+	fkCol1Name := strings.ToLower(table1.Name) + "Id"
+	fkCol1 := models.InitColumn(fkCol1Name, joinTable.Name, schema.Name)
+	fkCol1.Type = pk1.Type
+	fkCol1.NotNull = true
+	joinTable.Columns[fkCol1Name] = fkCol1
+
+	// Create FK column for table2
+	fkCol2Name := strings.ToLower(table2.Name) + "Id"
+	fkCol2 := models.InitColumn(fkCol2Name, joinTable.Name, schema.Name)
+	fkCol2.Type = pk2.Type
+	fkCol2.NotNull = true
+	joinTable.Columns[fkCol2Name] = fkCol2
+
+	// Create composite primary key
+	pkConstraint := models.InitConstraint(
+		fmt.Sprintf("pk_%s", joinTableName),
+		models.PrimaryKeyConstraint,
+	)
+	pkConstraint.Schema = schema.Name
+	pkConstraint.Table = joinTable.Name
+	pkConstraint.Columns = []string{fkCol1Name, fkCol2Name}
+	joinTable.Constraints[pkConstraint.Name] = pkConstraint
+
+	// Create FK constraint to table1
+	fk1 := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", joinTableName, table1.Name),
+		models.ForeignKeyConstraint,
+	)
+	fk1.Schema = schema.Name
+	fk1.Table = joinTable.Name
+	fk1.Columns = []string{fkCol1Name}
+	fk1.ReferencedSchema = schema.Name
+	fk1.ReferencedTable = table1.Name
+	fk1.ReferencedColumns = []string{pk1.Name}
+	fk1.OnDelete = "CASCADE"
+	fk1.OnUpdate = "RESTRICT"
+	joinTable.Constraints[fk1.Name] = fk1
+
+	// Create FK constraint to table2
+	fk2 := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", joinTableName, table2.Name),
+		models.ForeignKeyConstraint,
+	)
+	fk2.Schema = schema.Name
+	fk2.Table = joinTable.Name
+	fk2.Columns = []string{fkCol2Name}
+	fk2.ReferencedSchema = schema.Name
+	fk2.ReferencedTable = table2.Name
+	fk2.ReferencedColumns = []string{pk2.Name}
+	fk2.OnDelete = "CASCADE"
+	fk2.OnUpdate = "RESTRICT"
+	joinTable.Constraints[fk2.Name] = fk2
+
+	// Create relationships
+	rel1 := models.InitRelationship(
+		fmt.Sprintf("rel_%s_%s_%s", joinTableName, table1.Name, table2.Name),
+		models.ManyToMany,
+	)
+	rel1.FromTable = table1.Name
+	rel1.FromSchema = schema.Name
+	rel1.ToTable = table2.Name
+	rel1.ToSchema = schema.Name
+	rel1.ThroughTable = joinTableName
+	rel1.ThroughSchema = schema.Name
+	joinTable.Relationships[rel1.Name] = rel1
+
+	// Add join table to schema
+	schema.Tables = append(schema.Tables, joinTable)
+	tableMap[joinTableName] = joinTable
+
+	return nil
+}

pkg/readers/graphql/type_mapping.go

@@ -0,0 +1,97 @@
+package graphql
+
+func (r *Reader) isScalarType(typeName string, ctx *parseContext) bool {
+	// Built-in GraphQL scalars
+	builtInScalars := map[string]bool{
+		"ID":      true,
+		"String":  true,
+		"Int":     true,
+		"Float":   true,
+		"Boolean": true,
+	}
+
+	if builtInScalars[typeName] {
+		return true
+	}
+
+	// Custom scalars declared in the schema
+	if ctx.customScalars[typeName] {
+		return true
+	}
+
+	// Common custom scalars (even if not declared)
+	commonCustomScalars := map[string]bool{
+		"DateTime": true,
+		"JSON":     true,
+		"Date":     true,
+		"Time":     true,
+		"Upload":   true,
+		"Decimal":  true,
+	}
+
+	return commonCustomScalars[typeName]
+}
+
+func (r *Reader) graphQLTypeToSQL(gqlType string, fieldName string, typeName string) string {
+	// Check for ID type with configurable mapping
+	if gqlType == "ID" {
+		// Check metadata for ID type preference
+		if r.options.Metadata != nil {
+			// Global idType setting
+			if idType, ok := r.options.Metadata["idType"].(string); ok {
+				if idType == "uuid" {
+					return "uuid"
+				}
+			}
+
+			// Per-type ID mapping
+			if typeIdMappings, ok := r.options.Metadata["typeIdMappings"].(map[string]string); ok {
+				if idType, ok := typeIdMappings[typeName]; ok {
+					if idType == "uuid" {
+						return "uuid"
+					}
+				}
+			}
+		}
+
+		return "bigint" // Default
+	}
+
+	// Custom scalar mappings
+	if r.options.Metadata != nil {
+		if customMappings, ok := r.options.Metadata["customScalarMappings"].(map[string]string); ok {
+			if sqlType, ok := customMappings[gqlType]; ok {
+				return sqlType
+			}
+		}
+	}
+
+	// Built-in custom scalar mappings
+	customScalars := map[string]string{
+		"DateTime": "timestamp",
+		"JSON":     "jsonb",
+		"Date":     "date",
+		"Time":     "time",
+		"Decimal":  "numeric",
+		"Upload":   "bytea",
+	}
+	if sqlType, ok := customScalars[gqlType]; ok {
+		return sqlType
+	}
+
+	// Standard scalar mappings
+	typeMap := map[string]string{
+		"String":  "text",
+		"Int":     "integer",
+		"Float":   "double precision",
+		"Boolean": "boolean",
+	}
+
+	if sqlType, ok := typeMap[gqlType]; ok {
+		return sqlType
+	}
+
+	// If not a known scalar, assume it's an enum or custom type
+	// Return as-is (might be an enum)
+	return gqlType
+}

pkg/readers/json/README.md

@@ -0,0 +1,152 @@
+# JSON Reader
+
+Reads database schema definitions from JSON files.
+
+## Overview
+
+The JSON Reader parses JSON files that define database schemas in RelSpec's canonical JSON format and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Reads RelSpec's standard JSON schema format
+- Supports complete schema representation including:
+  - Databases and schemas
+  - Tables, columns, and data types
+  - Constraints (PK, FK, unique, check)
+  - Indexes
+  - Relationships
+  - Views and sequences
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/json"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/schema.json",
+    }
+
+    reader := json.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read JSON schema and convert to GORM models
+relspec --input json --in-file schema.json --output gorm --out-file models.go
+
+# Convert JSON to PostgreSQL DDL
+relspec --input json --in-file database.json --output pgsql --out-file schema.sql
+
+# Transform JSON to YAML
+relspec --input json --in-file schema.json --output yaml --out-file schema.yaml
+```
+
+## Example JSON Schema
+
+```json
+{
+  "name": "myapp",
+  "database_type": "postgresql",
+  "schemas": [
+    {
+      "name": "public",
+      "tables": [
+        {
+          "name": "users",
+          "schema": "public",
+          "columns": {
+            "id": {
+              "name": "id",
+              "type": "bigint",
+              "not_null": true,
+              "is_primary_key": true,
+              "auto_increment": true,
+              "sequence": 1
+            },
+            "username": {
+              "name": "username",
+              "type": "varchar",
+              "length": 50,
+              "not_null": true,
+              "sequence": 2
+            },
+            "email": {
+              "name": "email",
+              "type": "varchar",
+              "length": 100,
+              "not_null": true,
+              "sequence": 3
+            }
+          },
+          "constraints": {
+            "pk_users": {
+              "name": "pk_users",
+              "type": "PRIMARY KEY",
+              "columns": ["id"]
+            },
+            "uq_users_username": {
+              "name": "uq_users_username",
+              "type": "UNIQUE",
+              "columns": ["username"]
+            }
+          },
+          "indexes": {
+            "idx_users_email": {
+              "name": "idx_users_email",
+              "columns": ["email"],
+              "unique": false,
+              "type": "btree"
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
+```
+
+## Schema Structure
+
+The JSON format follows RelSpec's internal model structure:
+
+- `Database` - Top-level container
+  - `name` - Database name
+  - `database_type` - Database system (postgresql, mysql, etc.)
+  - `schemas[]` - Array of schemas
+
+- `Schema` - Schema/namespace
+  - `name` - Schema name
+  - `tables[]` - Array of tables
+  - `views[]` - Array of views
+  - `sequences[]` - Array of sequences
+
+- `Table` - Table definition
+  - `name` - Table name
+  - `columns{}` - Map of columns
+  - `constraints{}` - Map of constraints
+  - `indexes{}` - Map of indexes
+  - `relationships{}` - Map of relationships
+
+## Notes
+
+- This is RelSpec's native interchange format
+- Preserves complete schema information
+- Ideal for version control and schema documentation
+- Can be used as an intermediate format for transformations

pkg/readers/pgsql/README.md

@@ -0,0 +1,138 @@
+# PostgreSQL Reader
+
+Reads schema information directly from a live PostgreSQL database.
+
+## Overview
+
+The PostgreSQL Reader connects to a PostgreSQL database and introspects its schema, extracting complete information about tables, columns, constraints, indexes, views, and sequences.
+
+## Features
+
+- Direct database introspection
+- Extracts complete schema information including:
+  - Tables and columns
+  - Primary keys, foreign keys, unique constraints, check constraints
+  - Indexes
+  - Views
+  - Sequences
+- Supports multiple schemas
+- Captures constraint actions (ON DELETE, ON UPDATE)
+- Derives relationships from foreign keys
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        ConnectionString: "postgres://user:password@localhost:5432/mydb?sslmode=disable",
+    }
+
+    reader := pgsql.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Database: %s\n", db.Name)
+    fmt.Printf("Schemas: %d\n", len(db.Schemas))
+    for _, schema := range db.Schemas {
+        fmt.Printf("  Schema: %s, Tables: %d\n", schema.Name, len(schema.Tables))
+    }
+}
+```
+
+### CLI Example
+
+```bash
+# Inspect PostgreSQL database and export to JSON
+relspec --input pgsql \
+  --conn "postgres://user:password@localhost:5432/mydb" \
+  --output json \
+  --out-file schema.json
+
+# Generate GORM models from PostgreSQL database
+relspec --input pgsql \
+  --conn "postgres://user:password@localhost:5432/mydb" \
+  --output gorm \
+  --out-file models.go
+
+# Export database structure to YAML
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb?sslmode=disable" \
+  --output yaml \
+  --out-file schema.yaml
+```
+
+## Connection String Format
+
+The reader uses PostgreSQL connection strings in the format:
+
+```
+postgres://username:password@hostname:port/database?parameters
+```
+
+Examples:
+```
+postgres://localhost/mydb
+postgres://user:pass@localhost:5432/mydb
+postgres://user@localhost/mydb?sslmode=disable
+postgres://user:pass@db.example.com:5432/production?sslmode=require
+```
+
+## Extracted Information
+
+### Tables
+- Table name and schema
+- Comments/descriptions
+- All columns with data types, nullable, defaults
+- Sequences
+
+### Columns
+- Column name, data type, length/precision
+- NULL/NOT NULL constraints
+- Default values
+- Auto-increment information
+- Primary key designation
+
+### Constraints
+- Primary keys
+- Foreign keys (with ON DELETE/UPDATE actions)
+- Unique constraints
+- Check constraints
+
+### Indexes
+- Index name and type (btree, hash, gist, gin, etc.)
+- Columns in index
+- Unique/non-unique
+- Partial indexes
+
+### Views
+- View definitions
+- Column information
+
+### Sequences
+- Sequence properties
+- Associated tables
+
+## Notes
+
+- Requires PostgreSQL connection permissions
+- Reads all non-system schemas (excludes pg_catalog, information_schema, pg_toast)
+- Captures PostgreSQL-specific data types
+- Automatically maps PostgreSQL types to canonical types
+- Preserves relationship metadata for downstream conversion
+
+## Requirements
+
+- Go library: `github.com/jackc/pgx/v5`
+- Database user must have SELECT permissions on system catalogs

pkg/readers/prisma/README.md

@@ -0,0 +1,103 @@
+# Prisma Reader
+
+Reads Prisma schema files and extracts database schema information.
+
+## Overview
+
+The Prisma Reader parses `.prisma` schema files that define database models using Prisma's schema language and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Parses Prisma schema syntax
+- Extracts models, fields, and relationships
+- Supports Prisma attributes and directives
+- Handles enums and composite types
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/prisma"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/schema.prisma",
+    }
+
+    reader := prisma.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read Prisma schema and convert to JSON
+relspec --input prisma --in-file schema.prisma --output json --out-file schema.json
+
+# Convert Prisma to GORM models
+relspec --input prisma --in-file schema.prisma --output gorm --out-file models.go
+```
+
+## Example Prisma Schema
+
+```prisma
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+model User {
+  id        Int      @id @default(autoincrement())
+  username  String   @unique @db.VarChar(50)
+  email     String   @db.VarChar(100)
+  createdAt DateTime @default(now()) @map("created_at")
+
+  posts Post[]
+
+  @@map("users")
+}
+
+model Post {
+  id      Int    @id @default(autoincrement())
+  userId  Int    @map("user_id")
+  title   String @db.VarChar(200)
+  content String @db.Text
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("posts")
+}
+```
+
+## Supported Prisma Attributes
+
+- `@id` - Primary key
+- `@unique` - Unique constraint
+- `@default` - Default value
+- `@map` - Column name mapping
+- `@@map` - Table name mapping
+- `@relation` - Relationship definition
+- `@db.*` - Database-specific type annotations
+
+## Notes
+
+- Extracts datasource provider information
+- Supports `@@map` for custom table names
+- Handles Prisma-specific types and converts them to standard SQL types

pkg/readers/prisma/reader.go

@@ -0,0 +1,815 @@
+package prisma
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+// Reader implements the readers.Reader interface for Prisma schema format
+type Reader struct {
+	options *readers.ReaderOptions
+}
+
+// NewReader creates a new Prisma reader with the given options
+func NewReader(options *readers.ReaderOptions) *Reader {
+	return &Reader{
+		options: options,
+	}
+}
+
+// ReadDatabase reads and parses Prisma schema input, returning a Database model
+func (r *Reader) ReadDatabase() (*models.Database, error) {
+	if r.options.FilePath == "" {
+		return nil, fmt.Errorf("file path is required for Prisma reader")
+	}
+
+	content, err := os.ReadFile(r.options.FilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read file: %w", err)
+	}
+
+	return r.parsePrisma(string(content))
+}
+
+// ReadSchema reads and parses Prisma schema input, returning a Schema model
+func (r *Reader) ReadSchema() (*models.Schema, error) {
+	db, err := r.ReadDatabase()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(db.Schemas) == 0 {
+		return nil, fmt.Errorf("no schemas found in Prisma schema")
+	}
+
+	// Return the first schema
+	return db.Schemas[0], nil
+}
+
+// ReadTable reads and parses Prisma schema input, returning a Table model
+func (r *Reader) ReadTable() (*models.Table, error) {
+	schema, err := r.ReadSchema()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(schema.Tables) == 0 {
+		return nil, fmt.Errorf("no tables found in Prisma schema")
+	}
+
+	// Return the first table
+	return schema.Tables[0], nil
+}
+
+// parsePrisma parses Prisma schema content and returns a Database model
+func (r *Reader) parsePrisma(content string) (*models.Database, error) {
+	db := models.InitDatabase("database")
+
+	if r.options.Metadata != nil {
+		if name, ok := r.options.Metadata["name"].(string); ok {
+			db.Name = name
+		}
+	}
+
+	// Default schema for Prisma (doesn't have explicit schema concept in most cases)
+	schema := models.InitSchema("public")
+	schema.Enums = make([]*models.Enum, 0)
+
+	scanner := bufio.NewScanner(strings.NewReader(content))
+
+	// State tracking
+	var currentBlock string // "datasource", "generator", "model", "enum"
+	var currentTable *models.Table
+	var currentEnum *models.Enum
+	var blockContent []string
+
+	// Regex patterns
+	datasourceRegex := regexp.MustCompile(`^datasource\s+\w+\s*{`)
+	generatorRegex := regexp.MustCompile(`^generator\s+\w+\s*{`)
+	modelRegex := regexp.MustCompile(`^model\s+(\w+)\s*{`)
+	enumRegex := regexp.MustCompile(`^enum\s+(\w+)\s*{`)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		trimmed := strings.TrimSpace(line)
+
+		// Skip empty lines and comments
+		if trimmed == "" || strings.HasPrefix(trimmed, "//") {
+			continue
+		}
+
+		// Check for block start
+		if matches := datasourceRegex.FindStringSubmatch(trimmed); matches != nil {
+			currentBlock = "datasource"
+			blockContent = []string{}
+			continue
+		}
+
+		if matches := generatorRegex.FindStringSubmatch(trimmed); matches != nil {
+			currentBlock = "generator"
+			blockContent = []string{}
+			continue
+		}
+
+		if matches := modelRegex.FindStringSubmatch(trimmed); matches != nil {
+			currentBlock = "model"
+			tableName := matches[1]
+			currentTable = models.InitTable(tableName, "public")
+			blockContent = []string{}
+			continue
+		}
+
+		if matches := enumRegex.FindStringSubmatch(trimmed); matches != nil {
+			currentBlock = "enum"
+			enumName := matches[1]
+			currentEnum = &models.Enum{
+				Name:   enumName,
+				Schema: "public",
+				Values: make([]string, 0),
+			}
+			blockContent = []string{}
+			continue
+		}
+
+		// Check for block end
+		if trimmed == "}" {
+			switch currentBlock {
+			case "datasource":
+				r.parseDatasource(blockContent, db)
+			case "generator":
+				// We don't need to do anything with generator blocks
+			case "model":
+				if currentTable != nil {
+					r.parseModelFields(blockContent, currentTable)
+					schema.Tables = append(schema.Tables, currentTable)
+					currentTable = nil
+				}
+			case "enum":
+				if currentEnum != nil {
+					schema.Enums = append(schema.Enums, currentEnum)
+					currentEnum = nil
+				}
+			}
+			currentBlock = ""
+			blockContent = []string{}
+			continue
+		}
+
+		// Accumulate block content
+		if currentBlock != "" {
+			if currentBlock == "enum" && currentEnum != nil {
+				// For enums, just add the trimmed value
+				if trimmed != "" {
+					currentEnum.Values = append(currentEnum.Values, trimmed)
+				}
+			} else {
+				blockContent = append(blockContent, line)
+			}
+		}
+	}
+
+	// Second pass: resolve relationships
+	r.resolveRelationships(schema)
+
+	db.Schemas = append(db.Schemas, schema)
+	return db, nil
+}
+
+// parseDatasource extracts database type from datasource block
+func (r *Reader) parseDatasource(lines []string, db *models.Database) {
+	providerRegex := regexp.MustCompile(`provider\s*=\s*"?(\w+)"?`)
+
+	for _, line := range lines {
+		if matches := providerRegex.FindStringSubmatch(line); matches != nil {
+			provider := matches[1]
+			switch provider {
+			case "postgresql", "postgres":
+				db.DatabaseType = models.PostgresqlDatabaseType
+			case "mysql":
+				db.DatabaseType = "mysql"
+			case "sqlite":
+				db.DatabaseType = models.SqlLiteDatabaseType
+			case "sqlserver":
+				db.DatabaseType = models.MSSQLDatabaseType
+			default:
+				db.DatabaseType = models.PostgresqlDatabaseType
+			}
+			break
+		}
+	}
+}
+
+// parseModelFields parses model field definitions
+func (r *Reader) parseModelFields(lines []string, table *models.Table) {
+	fieldRegex := regexp.MustCompile(`^(\w+)\s+(\w+)(\?|\[\])?\s*(@.+)?`)
+	blockAttrRegex := regexp.MustCompile(`^@@(\w+)\((.*?)\)`)
+
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+
+		// Skip empty lines and comments
+		if trimmed == "" || strings.HasPrefix(trimmed, "//") {
+			continue
+		}
+
+		// Check for block attributes (@@id, @@unique, @@index)
+		if matches := blockAttrRegex.FindStringSubmatch(trimmed); matches != nil {
+			attrName := matches[1]
+			attrContent := matches[2]
+			r.parseBlockAttribute(attrName, attrContent, table)
+			continue
+		}
+
+		// Parse field definition
+		if matches := fieldRegex.FindStringSubmatch(trimmed); matches != nil {
+			fieldName := matches[1]
+			fieldType := matches[2]
+			modifier := matches[3]   // ? or []
+			attributes := matches[4] // @... part
+
+			column := r.parseField(fieldName, fieldType, modifier, attributes, table)
+			if column != nil {
+				table.Columns[column.Name] = column
+			}
+		}
+	}
+}
+
+// parseField parses a single field definition
+func (r *Reader) parseField(name, fieldType, modifier, attributes string, table *models.Table) *models.Column {
+	// Check if this is a relation field (array or references another model)
+	if modifier == "[]" {
+		// Array field - this is a relation field, not a column
+		// We'll handle this in relationship resolution
+		return nil
+	}
+
+	// Check if this is a non-primitive type (relation field)
+	// Note: We need to allow enum types through as they're like primitives
+	if !r.isPrimitiveType(fieldType) && !r.isEnumType(fieldType, table) {
+		// This is a relation field (e.g., user User), not a scalar column
+		// Only process this if it has @relation attribute (which means it's the owning side with FK)
+		// Otherwise skip it as it's just the inverse relation field
+		if attributes == "" || !strings.Contains(attributes, "@relation") {
+			return nil
+		}
+		// If it has @relation, we still don't create a column for it
+		// The actual FK column will be in the fields: [...] part of @relation
+		return nil
+	}
+
+	column := models.InitColumn(name, table.Name, table.Schema)
+
+	// Map Prisma type to SQL type
+	column.Type = r.prismaTypeToSQL(fieldType)
+
+	// Handle modifiers
+	if modifier == "?" {
+		column.NotNull = false
+	} else {
+		// Default: required fields are NOT NULL
+		column.NotNull = true
+	}
+
+	// Parse field attributes
+	if attributes != "" {
+		r.parseFieldAttributes(attributes, column, table)
+	}
+
+	return column
+}
+
+// prismaTypeToSQL converts Prisma types to SQL types
+func (r *Reader) prismaTypeToSQL(prismaType string) string {
+	typeMap := map[string]string{
+		"String":   "text",
+		"Boolean":  "boolean",
+		"Int":      "integer",
+		"BigInt":   "bigint",
+		"Float":    "double precision",
+		"Decimal":  "decimal",
+		"DateTime": "timestamp",
+		"Json":     "jsonb",
+		"Bytes":    "bytea",
+	}
+
+	if sqlType, ok := typeMap[prismaType]; ok {
+		return sqlType
+	}
+
+	// If not a built-in type, it might be an enum or model reference
+	// For enums, we'll use the enum name directly
+	return prismaType
+}
+
+// parseFieldAttributes parses field attributes like @id, @unique, @default
+func (r *Reader) parseFieldAttributes(attributes string, column *models.Column, table *models.Table) {
+	// @id attribute
+	if strings.Contains(attributes, "@id") {
+		column.IsPrimaryKey = true
+		column.NotNull = true
+	}
+
+	// @unique attribute
+	if regexp.MustCompile(`@unique\b`).MatchString(attributes) {
+		uniqueConstraint := models.InitConstraint(
+			fmt.Sprintf("uq_%s", column.Name),
+			models.UniqueConstraint,
+		)
+		uniqueConstraint.Schema = table.Schema
+		uniqueConstraint.Table = table.Name
+		uniqueConstraint.Columns = []string{column.Name}
+		table.Constraints[uniqueConstraint.Name] = uniqueConstraint
+	}
+
+	// @default attribute - extract value with balanced parentheses
+	if strings.Contains(attributes, "@default(") {
+		defaultValue := r.extractDefaultValue(attributes)
+		if defaultValue != "" {
+			r.parseDefaultValue(defaultValue, column)
+		}
+	}
+
+	// @updatedAt attribute - store in comment for now
+	if strings.Contains(attributes, "@updatedAt") {
+		if column.Comment != "" {
+			column.Comment += "; @updatedAt"
+		} else {
+			column.Comment = "@updatedAt"
+		}
+	}
+
+	// @relation attribute - we'll handle this in relationship resolution
+	// For now, just note that this field is part of a relation
+}
+
+// extractDefaultValue extracts the default value from @default(...) handling nested parentheses
+func (r *Reader) extractDefaultValue(attributes string) string {
+	idx := strings.Index(attributes, "@default(")
+	if idx == -1 {
+		return ""
+	}
+
+	start := idx + len("@default(")
+	depth := 1
+	i := start
+
+	for i < len(attributes) && depth > 0 {
+		switch attributes[i] {
+		case '(':
+			depth++
+		case ')':
+			depth--
+		}
+		i++
+	}
+
+	if depth == 0 {
+		return attributes[start : i-1]
+	}
+
+	return ""
+}
+
+// parseDefaultValue parses Prisma default value expressions
+func (r *Reader) parseDefaultValue(defaultExpr string, column *models.Column) {
+	defaultExpr = strings.TrimSpace(defaultExpr)
+
+	switch defaultExpr {
+	case "autoincrement()":
+		column.AutoIncrement = true
+	case "now()":
+		column.Default = "now()"
+	case "uuid()":
+		column.Default = "gen_random_uuid()"
+	case "cuid()":
+		// CUID is Prisma-specific, store in comment
+		if column.Comment != "" {
+			column.Comment += "; default(cuid())"
+		} else {
+			column.Comment = "default(cuid())"
+		}
+	case "true":
+		column.Default = true
+	case "false":
+		column.Default = false
+	default:
+		// Check if it's a string literal
+		if strings.HasPrefix(defaultExpr, "\"") && strings.HasSuffix(defaultExpr, "\"") {
+			column.Default = defaultExpr[1 : len(defaultExpr)-1]
+		} else if strings.HasPrefix(defaultExpr, "'") && strings.HasSuffix(defaultExpr, "'") {
+			column.Default = defaultExpr[1 : len(defaultExpr)-1]
+		} else {
+			// Try to parse as number or enum value
+			column.Default = defaultExpr
+		}
+	}
+}
+
+// parseBlockAttribute parses block-level attributes like @@id, @@unique, @@index
+func (r *Reader) parseBlockAttribute(attrName, content string, table *models.Table) {
+	// Extract column list from brackets [col1, col2]
+	colListRegex := regexp.MustCompile(`\[(.*?)\]`)
+	matches := colListRegex.FindStringSubmatch(content)
+	if matches == nil {
+		return
+	}
+
+	columnList := strings.Split(matches[1], ",")
+	columns := make([]string, 0)
+	for _, col := range columnList {
+		columns = append(columns, strings.TrimSpace(col))
+	}
+
+	switch attrName {
+	case "id":
+		// Composite primary key
+		for _, colName := range columns {
+			if col, exists := table.Columns[colName]; exists {
+				col.IsPrimaryKey = true
+				col.NotNull = true
+			}
+		}
+		// Also create a PK constraint
+		pkConstraint := models.InitConstraint(
+			fmt.Sprintf("pk_%s", table.Name),
+			models.PrimaryKeyConstraint,
+		)
+		pkConstraint.Schema = table.Schema
+		pkConstraint.Table = table.Name
+		pkConstraint.Columns = columns
+		table.Constraints[pkConstraint.Name] = pkConstraint
+
+	case "unique":
+		// Multi-column unique constraint
+		uniqueConstraint := models.InitConstraint(
+			fmt.Sprintf("uq_%s_%s", table.Name, strings.Join(columns, "_")),
+			models.UniqueConstraint,
+		)
+		uniqueConstraint.Schema = table.Schema
+		uniqueConstraint.Table = table.Name
+		uniqueConstraint.Columns = columns
+		table.Constraints[uniqueConstraint.Name] = uniqueConstraint
+
+	case "index":
+		// Index
+		index := models.InitIndex(
+			fmt.Sprintf("idx_%s_%s", table.Name, strings.Join(columns, "_")),
+			table.Name,
+			table.Schema,
+		)
+		index.Columns = columns
+		table.Indexes[index.Name] = index
+	}
+}
+
+// relationField stores information about a relation field for second-pass processing
+type relationField struct {
+	tableName    string
+	fieldName    string
+	relatedModel string
+	isArray      bool
+	relationAttr string
+}
+
+// resolveRelationships performs a second pass to resolve @relation attributes
+func (r *Reader) resolveRelationships(schema *models.Schema) {
+	// Build a map of table names for quick lookup
+	tableMap := make(map[string]*models.Table)
+	for _, table := range schema.Tables {
+		tableMap[table.Name] = table
+	}
+
+	// First, we need to re-parse to find relation fields
+	// We'll re-read the file to extract relation information
+	if r.options.FilePath == "" {
+		return
+	}
+
+	content, err := os.ReadFile(r.options.FilePath)
+	if err != nil {
+		return
+	}
+
+	relations := r.extractRelationFields(string(content))
+
+	// Process explicit @relation attributes to create FK constraints
+	for _, rel := range relations {
+		if rel.relationAttr != "" {
+			r.createConstraintFromRelation(rel, tableMap, schema)
+		}
+	}
+
+	// Detect implicit many-to-many relationships
+	r.detectImplicitManyToMany(relations, tableMap, schema)
+}
+
+// extractRelationFields extracts relation field information from the schema
+func (r *Reader) extractRelationFields(content string) []relationField {
+	relations := make([]relationField, 0)
+	scanner := bufio.NewScanner(strings.NewReader(content))
+
+	modelRegex := regexp.MustCompile(`^model\s+(\w+)\s*{`)
+	fieldRegex := regexp.MustCompile(`^(\w+)\s+(\w+)(\?|\[\])?\s*(@.+)?`)
+
+	var currentModel string
+	inModel := false
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		trimmed := strings.TrimSpace(line)
+
+		if trimmed == "" || strings.HasPrefix(trimmed, "//") {
+			continue
+		}
+
+		if matches := modelRegex.FindStringSubmatch(trimmed); matches != nil {
+			currentModel = matches[1]
+			inModel = true
+			continue
+		}
+
+		if trimmed == "}" {
+			inModel = false
+			currentModel = ""
+			continue
+		}
+
+		if inModel && currentModel != "" {
+			if matches := fieldRegex.FindStringSubmatch(trimmed); matches != nil {
+				fieldName := matches[1]
+				fieldType := matches[2]
+				modifier := matches[3]
+				attributes := matches[4]
+
+				// Check if this is a relation field (references another model or is an array)
+				isPotentialRelation := modifier == "[]" || !r.isPrimitiveType(fieldType)
+
+				if isPotentialRelation {
+					rel := relationField{
+						tableName:    currentModel,
+						fieldName:    fieldName,
+						relatedModel: fieldType,
+						isArray:      modifier == "[]",
+						relationAttr: attributes,
+					}
+					relations = append(relations, rel)
+				}
+			}
+		}
+	}
+
+	return relations
+}
+
+// isPrimitiveType checks if a type is a Prisma primitive type
+func (r *Reader) isPrimitiveType(typeName string) bool {
+	primitives := []string{"String", "Boolean", "Int", "BigInt", "Float", "Decimal", "DateTime", "Json", "Bytes"}
+	for _, p := range primitives {
+		if typeName == p {
+			return true
+		}
+	}
+	return false
+}
+
+// isEnumType checks if a type name might be an enum
+// Note: We can't definitively check against schema.Enums at parse time
+// because enums might be defined after the model, so we just check
+// if it starts with uppercase (Prisma convention for enums)
+func (r *Reader) isEnumType(typeName string, table *models.Table) bool {
+	// Simple heuristic: enum types start with uppercase letter
+	// and are not known model names (though we can't check that yet)
+	if len(typeName) > 0 && typeName[0] >= 'A' && typeName[0] <= 'Z' {
+		// Additional check: primitive types are already handled above
+		// So if it's uppercase and not primitive, it's likely an enum or model
+		// We'll assume it's an enum if it's a single word
+		return !strings.Contains(typeName, "_")
+	}
+	return false
+}
+
+// createConstraintFromRelation creates a FK constraint from a @relation attribute
+func (r *Reader) createConstraintFromRelation(rel relationField, tableMap map[string]*models.Table, schema *models.Schema) {
+	// Skip array fields (they are the inverse side of the relation)
+	if rel.isArray {
+		return
+	}
+
+	if rel.relationAttr == "" {
+		return
+	}
+
+	// Parse @relation attribute
+	relationRegex := regexp.MustCompile(`@relation\((.*?)\)`)
+	matches := relationRegex.FindStringSubmatch(rel.relationAttr)
+	if matches == nil {
+		return
+	}
+
+	relationContent := matches[1]
+
+	// Extract fields and references
+	fieldsRegex := regexp.MustCompile(`fields:\s*\[(.*?)\]`)
+	referencesRegex := regexp.MustCompile(`references:\s*\[(.*?)\]`)
+	nameRegex := regexp.MustCompile(`name:\s*"([^"]+)"`)
+	onDeleteRegex := regexp.MustCompile(`onDelete:\s*(\w+)`)
+	onUpdateRegex := regexp.MustCompile(`onUpdate:\s*(\w+)`)
+
+	fieldsMatch := fieldsRegex.FindStringSubmatch(relationContent)
+	referencesMatch := referencesRegex.FindStringSubmatch(relationContent)
+
+	if fieldsMatch == nil || referencesMatch == nil {
+		return
+	}
+
+	// Parse field and reference column lists
+	fieldCols := r.parseColumnList(fieldsMatch[1])
+	refCols := r.parseColumnList(referencesMatch[1])
+
+	if len(fieldCols) == 0 || len(refCols) == 0 {
+		return
+	}
+
+	// Create FK constraint
+	constraintName := fmt.Sprintf("fk_%s_%s", rel.tableName, fieldCols[0])
+
+	// Check for custom name
+	if nameMatch := nameRegex.FindStringSubmatch(relationContent); nameMatch != nil {
+		constraintName = nameMatch[1]
+	}
+
+	constraint := models.InitConstraint(constraintName, models.ForeignKeyConstraint)
+	constraint.Schema = "public"
+	constraint.Table = rel.tableName
+	constraint.Columns = fieldCols
+	constraint.ReferencedSchema = "public"
+	constraint.ReferencedTable = rel.relatedModel
+	constraint.ReferencedColumns = refCols
+
+	// Parse referential actions
+	if onDeleteMatch := onDeleteRegex.FindStringSubmatch(relationContent); onDeleteMatch != nil {
+		constraint.OnDelete = onDeleteMatch[1]
+	}
+
+	if onUpdateMatch := onUpdateRegex.FindStringSubmatch(relationContent); onUpdateMatch != nil {
+		constraint.OnUpdate = onUpdateMatch[1]
+	}
+
+	// Add constraint to table
+	if table, exists := tableMap[rel.tableName]; exists {
+		table.Constraints[constraint.Name] = constraint
+	}
+}
+
+// parseColumnList parses a comma-separated list of column names
+func (r *Reader) parseColumnList(list string) []string {
+	parts := strings.Split(list, ",")
+	result := make([]string, 0)
+	for _, part := range parts {
+		trimmed := strings.TrimSpace(part)
+		if trimmed != "" {
+			result = append(result, trimmed)
+		}
+	}
+	return result
+}
+
+// detectImplicitManyToMany detects implicit M2M relationships and creates join tables
+func (r *Reader) detectImplicitManyToMany(relations []relationField, tableMap map[string]*models.Table, schema *models.Schema) {
+	// Group relations by model pairs
+	type modelPair struct {
+		model1 string
+		model2 string
+	}
+
+	pairMap := make(map[modelPair][]relationField)
+
+	for _, rel := range relations {
+		if !rel.isArray || rel.relationAttr != "" {
+			// Skip non-array fields and explicit relations
+			continue
+		}
+
+		// Create a normalized pair (alphabetically sorted to avoid duplicates)
+		pair := modelPair{}
+		if rel.tableName < rel.relatedModel {
+			pair.model1 = rel.tableName
+			pair.model2 = rel.relatedModel
+		} else {
+			pair.model1 = rel.relatedModel
+			pair.model2 = rel.tableName
+		}
+
+		pairMap[pair] = append(pairMap[pair], rel)
+	}
+
+	// Check for pairs with arrays on both sides (implicit M2M)
+	for pair, rels := range pairMap {
+		if len(rels) >= 2 {
+			// This is an implicit many-to-many relationship
+			r.createImplicitJoinTable(pair.model1, pair.model2, tableMap, schema)
+		}
+	}
+}
+
+// createImplicitJoinTable creates a virtual join table for implicit M2M relations
+func (r *Reader) createImplicitJoinTable(model1, model2 string, tableMap map[string]*models.Table, schema *models.Schema) {
+	// Prisma naming convention: _Model1ToModel2 (alphabetically sorted)
+	joinTableName := fmt.Sprintf("_%sTo%s", model1, model2)
+
+	// Check if join table already exists
+	if _, exists := tableMap[joinTableName]; exists {
+		return
+	}
+
+	// Create join table
+	joinTable := models.InitTable(joinTableName, "public")
+
+	// Get primary keys from both tables
+	pk1 := r.getPrimaryKeyColumn(tableMap[model1])
+	pk2 := r.getPrimaryKeyColumn(tableMap[model2])
+
+	if pk1 == nil || pk2 == nil {
+		return // Can't create join table without PKs
+	}
+
+	// Create FK columns in join table
+	fkCol1Name := fmt.Sprintf("%sId", model1)
+	fkCol1 := models.InitColumn(fkCol1Name, joinTableName, "public")
+	fkCol1.Type = pk1.Type
+	fkCol1.NotNull = true
+	joinTable.Columns[fkCol1Name] = fkCol1
+
+	fkCol2Name := fmt.Sprintf("%sId", model2)
+	fkCol2 := models.InitColumn(fkCol2Name, joinTableName, "public")
+	fkCol2.Type = pk2.Type
+	fkCol2.NotNull = true
+	joinTable.Columns[fkCol2Name] = fkCol2
+
+	// Create composite primary key
+	pkConstraint := models.InitConstraint(
+		fmt.Sprintf("pk_%s", joinTableName),
+		models.PrimaryKeyConstraint,
+	)
+	pkConstraint.Schema = "public"
+	pkConstraint.Table = joinTableName
+	pkConstraint.Columns = []string{fkCol1Name, fkCol2Name}
+	joinTable.Constraints[pkConstraint.Name] = pkConstraint
+
+	// Mark columns as PK
+	fkCol1.IsPrimaryKey = true
+	fkCol2.IsPrimaryKey = true
+
+	// Create FK constraints
+	fk1 := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", joinTableName, model1),
+		models.ForeignKeyConstraint,
+	)
+	fk1.Schema = "public"
+	fk1.Table = joinTableName
+	fk1.Columns = []string{fkCol1Name}
+	fk1.ReferencedSchema = "public"
+	fk1.ReferencedTable = model1
+	fk1.ReferencedColumns = []string{pk1.Name}
+	fk1.OnDelete = "Cascade"
+	joinTable.Constraints[fk1.Name] = fk1
+
+	fk2 := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", joinTableName, model2),
+		models.ForeignKeyConstraint,
+	)
+	fk2.Schema = "public"
+	fk2.Table = joinTableName
+	fk2.Columns = []string{fkCol2Name}
+	fk2.ReferencedSchema = "public"
+	fk2.ReferencedTable = model2
+	fk2.ReferencedColumns = []string{pk2.Name}
+	fk2.OnDelete = "Cascade"
+	joinTable.Constraints[fk2.Name] = fk2
+
+	// Add join table to schema
+	schema.Tables = append(schema.Tables, joinTable)
+	tableMap[joinTableName] = joinTable
+}
+
+// getPrimaryKeyColumn returns the primary key column of a table
+func (r *Reader) getPrimaryKeyColumn(table *models.Table) *models.Column {
+	if table == nil {
+		return nil
+	}
+
+	for _, col := range table.Columns {
+		if col.IsPrimaryKey {
+			return col
+		}
+	}
+
+	return nil
+}

pkg/readers/typeorm/README.md

@@ -0,0 +1,122 @@
+# TypeORM Reader
+
+Reads TypeScript files containing TypeORM entity definitions and extracts database schema information.
+
+## Overview
+
+The TypeORM Reader parses TypeScript source files that define TypeORM entities (classes with TypeORM decorators) and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Parses TypeORM decorators and entity definitions
+- Extracts table, column, and relationship information
+- Supports various TypeORM column types and options
+- Handles constraints, indexes, and relationships
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/typeorm"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/entities/",
+    }
+
+    reader := typeorm.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read TypeORM entities and convert to JSON
+relspec --input typeorm --in-file entities/ --output json --out-file schema.json
+
+# Convert TypeORM to GORM models
+relspec --input typeorm --in-file User.ts --output gorm --out-file models.go
+```
+
+## Example TypeORM Entity
+
+```typescript
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  OneToMany,
+} from 'typeorm';
+import { Post } from './Post';
+
+@Entity('users')
+export class User {
+  @PrimaryGeneratedColumn('increment')
+  id: number;
+
+  @Column({ type: 'varchar', length: 50, unique: true })
+  username: string;
+
+  @Column({ type: 'varchar', length: 100 })
+  email: string;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @OneToMany(() => Post, (post) => post.user)
+  posts: Post[];
+}
+
+@Entity('posts')
+export class Post {
+  @PrimaryGeneratedColumn('increment')
+  id: number;
+
+  @Column({ name: 'user_id' })
+  userId: number;
+
+  @Column({ type: 'varchar', length: 200 })
+  title: string;
+
+  @Column({ type: 'text' })
+  content: string;
+
+  @ManyToOne(() => User, (user) => user.posts, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'user_id' })
+  user: User;
+}
+```
+
+## Supported TypeORM Decorators
+
+- `@Entity()` - Entity/table definition
+- `@PrimaryGeneratedColumn()` - Auto-increment primary key
+- `@PrimaryColumn()` - Primary key
+- `@Column()` - Column definition
+- `@CreateDateColumn()` - Auto-set creation timestamp
+- `@UpdateDateColumn()` - Auto-update timestamp
+- `@OneToMany()` - One-to-many relationship
+- `@ManyToOne()` - Many-to-one relationship
+- `@JoinColumn()` - Foreign key column
+- `@Index()` - Index definition
+- `@Unique()` - Unique constraint
+
+## Notes
+
+- Schema name can be specified in `@Entity()` decorator
+- Supports both JavaScript and TypeScript entity files
+- Relationship metadata is extracted from decorators

pkg/readers/typeorm/reader.go

@@ -0,0 +1,785 @@
+package typeorm
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+// Reader implements the readers.Reader interface for TypeORM entity files
+type Reader struct {
+	options *readers.ReaderOptions
+}
+
+// NewReader creates a new TypeORM reader with the given options
+func NewReader(options *readers.ReaderOptions) *Reader {
+	return &Reader{
+		options: options,
+	}
+}
+
+// ReadDatabase reads and parses TypeORM entity files, returning a Database model
+func (r *Reader) ReadDatabase() (*models.Database, error) {
+	if r.options.FilePath == "" {
+		return nil, fmt.Errorf("file path is required for TypeORM reader")
+	}
+
+	content, err := os.ReadFile(r.options.FilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read file: %w", err)
+	}
+
+	return r.parseTypeORM(string(content))
+}
+
+// ReadSchema reads and parses TypeORM entity files, returning a Schema model
+func (r *Reader) ReadSchema() (*models.Schema, error) {
+	db, err := r.ReadDatabase()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(db.Schemas) == 0 {
+		return nil, fmt.Errorf("no schemas found in TypeORM entities")
+	}
+
+	return db.Schemas[0], nil
+}
+
+// ReadTable reads and parses TypeORM entity files, returning a Table model
+func (r *Reader) ReadTable() (*models.Table, error) {
+	schema, err := r.ReadSchema()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(schema.Tables) == 0 {
+		return nil, fmt.Errorf("no tables found in TypeORM entities")
+	}
+
+	return schema.Tables[0], nil
+}
+
+// entityInfo stores information about an entity during parsing
+type entityInfo struct {
+	name       string
+	fields     []fieldInfo
+	decorators []string
+}
+
+// fieldInfo stores information about a field during parsing
+type fieldInfo struct {
+	name       string
+	typeName   string
+	decorators []string
+}
+
+// parseTypeORM parses TypeORM entity content and returns a Database model
+func (r *Reader) parseTypeORM(content string) (*models.Database, error) {
+	db := models.InitDatabase("database")
+	schema := models.InitSchema("public")
+
+	// Parse entities
+	entities := r.extractEntities(content)
+
+	// Convert entities to tables and views
+	tableMap := make(map[string]*models.Table)
+	for _, entity := range entities {
+		// Check if this is a view
+		isView := false
+		for _, decorator := range entity.decorators {
+			if strings.HasPrefix(decorator, "@ViewEntity") {
+				isView = true
+				break
+			}
+		}
+
+		if isView {
+			view := r.entityToView(entity)
+			schema.Views = append(schema.Views, view)
+		} else {
+			table := r.entityToTable(entity)
+			schema.Tables = append(schema.Tables, table)
+			tableMap[table.Name] = table
+		}
+	}
+
+	// Second pass: resolve relationships
+	r.resolveRelationships(entities, tableMap, schema)
+
+	db.Schemas = append(db.Schemas, schema)
+	return db, nil
+}
+
+// extractEntities extracts entity and view definitions from TypeORM content
+func (r *Reader) extractEntities(content string) []entityInfo {
+	entities := make([]entityInfo, 0)
+
+	// First, extract decorators properly (handling multi-line)
+	content = r.normalizeDecorators(content)
+
+	scanner := bufio.NewScanner(strings.NewReader(content))
+
+	entityRegex := regexp.MustCompile(`^export\s+class\s+(\w+)`)
+	decoratorRegex := regexp.MustCompile(`^\s*@(\w+)(\([^)]*\))?`)
+	fieldRegex := regexp.MustCompile(`^\s*(\w+):\s*([^;]+);`)
+
+	var currentEntity *entityInfo
+	var pendingDecorators []string
+	inClass := false
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		trimmed := strings.TrimSpace(line)
+
+		// Skip empty lines and comments
+		if trimmed == "" || strings.HasPrefix(trimmed, "//") || strings.HasPrefix(trimmed, "import ") {
+			continue
+		}
+
+		// Check for decorator
+		if matches := decoratorRegex.FindStringSubmatch(trimmed); matches != nil {
+			decorator := matches[0]
+			pendingDecorators = append(pendingDecorators, decorator)
+			continue
+		}
+
+		// Check for entity/view class
+		if matches := entityRegex.FindStringSubmatch(trimmed); matches != nil {
+			// Save previous entity if exists
+			if currentEntity != nil {
+				entities = append(entities, *currentEntity)
+			}
+
+			currentEntity = &entityInfo{
+				name:       matches[1],
+				fields:     make([]fieldInfo, 0),
+				decorators: pendingDecorators,
+			}
+			pendingDecorators = []string{}
+			inClass = true
+			continue
+		}
+
+		// Check for class end
+		if inClass && trimmed == "}" {
+			if currentEntity != nil {
+				entities = append(entities, *currentEntity)
+				currentEntity = nil
+			}
+			inClass = false
+			pendingDecorators = []string{}
+			continue
+		}
+
+		// Check for field definition
+		if inClass && currentEntity != nil {
+			if matches := fieldRegex.FindStringSubmatch(trimmed); matches != nil {
+				fieldName := matches[1]
+				fieldType := strings.TrimSpace(matches[2])
+
+				field := fieldInfo{
+					name:       fieldName,
+					typeName:   fieldType,
+					decorators: pendingDecorators,
+				}
+				currentEntity.fields = append(currentEntity.fields, field)
+				pendingDecorators = []string{}
+			}
+		}
+	}
+
+	// Save last entity
+	if currentEntity != nil {
+		entities = append(entities, *currentEntity)
+	}
+
+	return entities
+}
+
+// normalizeDecorators combines multi-line decorators into single lines
+func (r *Reader) normalizeDecorators(content string) string {
+	// Replace multi-line decorators with single-line versions
+	// Match @Decorator({ ... }) across multiple lines
+	decoratorRegex := regexp.MustCompile(`@(\w+)\s*\(\s*\{([^}]*)\}\s*\)`)
+
+	return decoratorRegex.ReplaceAllStringFunc(content, func(match string) string {
+		// Remove newlines and extra spaces from decorator
+		match = strings.ReplaceAll(match, "\n", " ")
+		match = strings.ReplaceAll(match, "\r", " ")
+		// Normalize multiple spaces
+		spaceRegex := regexp.MustCompile(`\s+`)
+		match = spaceRegex.ReplaceAllString(match, " ")
+		return match
+	})
+}
+
+// entityToView converts a view entity to a view
+func (r *Reader) entityToView(entity entityInfo) *models.View {
+	// Parse @ViewEntity decorator options
+	viewName := entity.name
+	schemaName := "public"
+	var expression string
+
+	for _, decorator := range entity.decorators {
+		if strings.HasPrefix(decorator, "@ViewEntity") {
+			// Extract options from @ViewEntity({ ... })
+			options := r.parseViewEntityOptions(decorator)
+
+			// Check for custom view name
+			if name, ok := options["name"]; ok {
+				viewName = name
+			}
+
+			// Check for schema
+			if schema, ok := options["schema"]; ok {
+				schemaName = schema
+			}
+
+			// Check for expression (SQL definition)
+			if expr, ok := options["expression"]; ok {
+				expression = expr
+			}
+			break
+		}
+	}
+
+	view := models.InitView(viewName, schemaName)
+	view.Definition = expression
+
+	// Add columns from fields (if any are defined in the view class)
+	for _, field := range entity.fields {
+		column := models.InitColumn(field.name, viewName, schemaName)
+		column.Type = r.typeScriptTypeToSQL(field.typeName)
+		view.Columns[column.Name] = column
+	}
+
+	return view
+}
+
+// parseViewEntityOptions parses @ViewEntity decorator options
+func (r *Reader) parseViewEntityOptions(decorator string) map[string]string {
+	options := make(map[string]string)
+
+	// Extract content between parentheses
+	start := strings.Index(decorator, "(")
+	end := strings.LastIndex(decorator, ")")
+
+	if start == -1 || end == -1 || start >= end {
+		return options
+	}
+
+	content := decorator[start+1 : end]
+
+	// Skip if empty @ViewEntity()
+	if strings.TrimSpace(content) == "" {
+		return options
+	}
+
+	// Parse name: "value"
+	nameRegex := regexp.MustCompile(`name:\s*["']([^"']+)["']`)
+	if matches := nameRegex.FindStringSubmatch(content); matches != nil {
+		options["name"] = matches[1]
+	}
+
+	// Parse schema: "value"
+	schemaRegex := regexp.MustCompile(`schema:\s*["']([^"']+)["']`)
+	if matches := schemaRegex.FindStringSubmatch(content); matches != nil {
+		options["schema"] = matches[1]
+	}
+
+	// Parse expression: ` ... ` (can be multi-line, captured as single line after normalization)
+	// Look for expression followed by backtick or quote
+	expressionRegex := regexp.MustCompile(`expression:\s*` + "`" + `([^` + "`" + `]+)` + "`")
+	if matches := expressionRegex.FindStringSubmatch(content); matches != nil {
+		options["expression"] = strings.TrimSpace(matches[1])
+	} else {
+		// Try with regular quotes
+		expressionRegex = regexp.MustCompile(`expression:\s*["']([^"']+)["']`)
+		if matches := expressionRegex.FindStringSubmatch(content); matches != nil {
+			options["expression"] = strings.TrimSpace(matches[1])
+		}
+	}
+
+	return options
+}
+
+// entityToTable converts an entity to a table
+func (r *Reader) entityToTable(entity entityInfo) *models.Table {
+	// Parse @Entity decorator options
+	tableName := entity.name
+	schemaName := "public"
+	var entityOptions map[string]string
+
+	for _, decorator := range entity.decorators {
+		if strings.HasPrefix(decorator, "@Entity") {
+			// Extract options from @Entity({ ... })
+			entityOptions = r.parseEntityOptions(decorator)
+
+			// Check for custom table name
+			if name, ok := entityOptions["name"]; ok {
+				tableName = name
+			}
+
+			// Check for schema
+			if schema, ok := entityOptions["schema"]; ok {
+				schemaName = schema
+			}
+			break
+		}
+	}
+
+	table := models.InitTable(tableName, schemaName)
+
+	// Store additional metadata from @Entity options
+	if entityOptions != nil {
+		// Store database name in metadata
+		if database, ok := entityOptions["database"]; ok {
+			if table.Metadata == nil {
+				table.Metadata = make(map[string]any)
+			}
+			table.Metadata["database"] = database
+		}
+
+		// Store engine in metadata
+		if engine, ok := entityOptions["engine"]; ok {
+			if table.Metadata == nil {
+				table.Metadata = make(map[string]any)
+			}
+			table.Metadata["engine"] = engine
+		}
+
+		// Store original class name if different from table name
+		if entity.name != tableName {
+			if table.Metadata == nil {
+				table.Metadata = make(map[string]any)
+			}
+			table.Metadata["class_name"] = entity.name
+		}
+	}
+
+	for _, field := range entity.fields {
+		// Skip relation fields (they'll be handled in relationship resolution)
+		if r.isRelationField(field) {
+			continue
+		}
+
+		column := r.fieldToColumn(field, table)
+		if column != nil {
+			table.Columns[column.Name] = column
+		}
+	}
+
+	return table
+}
+
+// parseEntityOptions parses @Entity decorator options
+func (r *Reader) parseEntityOptions(decorator string) map[string]string {
+	options := make(map[string]string)
+
+	// Extract content between parentheses
+	start := strings.Index(decorator, "(")
+	end := strings.LastIndex(decorator, ")")
+
+	if start == -1 || end == -1 || start >= end {
+		return options
+	}
+
+	content := decorator[start+1 : end]
+
+	// Skip if empty @Entity()
+	if strings.TrimSpace(content) == "" {
+		return options
+	}
+
+	// Parse name: "value" or name: 'value'
+	nameRegex := regexp.MustCompile(`name:\s*["']([^"']+)["']`)
+	if matches := nameRegex.FindStringSubmatch(content); matches != nil {
+		options["name"] = matches[1]
+	}
+
+	// Parse schema: "value"
+	schemaRegex := regexp.MustCompile(`schema:\s*["']([^"']+)["']`)
+	if matches := schemaRegex.FindStringSubmatch(content); matches != nil {
+		options["schema"] = matches[1]
+	}
+
+	// Parse database: "value"
+	databaseRegex := regexp.MustCompile(`database:\s*["']([^"']+)["']`)
+	if matches := databaseRegex.FindStringSubmatch(content); matches != nil {
+		options["database"] = matches[1]
+	}
+
+	// Parse engine: "value"
+	engineRegex := regexp.MustCompile(`engine:\s*["']([^"']+)["']`)
+	if matches := engineRegex.FindStringSubmatch(content); matches != nil {
+		options["engine"] = matches[1]
+	}
+
+	return options
+}
+
+// isRelationField checks if a field is a relation field
+func (r *Reader) isRelationField(field fieldInfo) bool {
+	for _, decorator := range field.decorators {
+		if strings.Contains(decorator, "@ManyToOne") ||
+			strings.Contains(decorator, "@OneToMany") ||
+			strings.Contains(decorator, "@ManyToMany") ||
+			strings.Contains(decorator, "@OneToOne") {
+			return true
+		}
+	}
+	return false
+}
+
+// fieldToColumn converts a field to a column
+func (r *Reader) fieldToColumn(field fieldInfo, table *models.Table) *models.Column {
+	column := models.InitColumn(field.name, table.Name, table.Schema)
+
+	// Map TypeScript type to SQL type
+	column.Type = r.typeScriptTypeToSQL(field.typeName)
+
+	// Default to NOT NULL
+	column.NotNull = true
+
+	// Parse decorators
+	for _, decorator := range field.decorators {
+		r.parseColumnDecorator(decorator, column, table)
+	}
+
+	return column
+}
+
+// typeScriptTypeToSQL converts TypeScript types to SQL types
+func (r *Reader) typeScriptTypeToSQL(tsType string) string {
+	// Remove array brackets and optional markers
+	tsType = strings.TrimSuffix(tsType, "[]")
+	tsType = strings.TrimSuffix(tsType, " | null")
+
+	typeMap := map[string]string{
+		"string":  "text",
+		"number":  "integer",
+		"boolean": "boolean",
+		"Date":    "timestamp",
+		"any":     "jsonb",
+	}
+
+	for tsPattern, sqlType := range typeMap {
+		if strings.Contains(tsType, tsPattern) {
+			return sqlType
+		}
+	}
+
+	// Default to text
+	return "text"
+}
+
+// parseColumnDecorator parses a column decorator
+func (r *Reader) parseColumnDecorator(decorator string, column *models.Column, table *models.Table) {
+	// @PrimaryGeneratedColumn
+	if strings.HasPrefix(decorator, "@PrimaryGeneratedColumn") {
+		column.IsPrimaryKey = true
+		column.NotNull = true
+
+		if strings.Contains(decorator, "'uuid'") {
+			column.Type = "uuid"
+			column.Default = "gen_random_uuid()"
+		} else if strings.Contains(decorator, "'increment'") || strings.Contains(decorator, "()") {
+			column.AutoIncrement = true
+		}
+		return
+	}
+
+	// @Column
+	if strings.HasPrefix(decorator, "@Column") {
+		r.parseColumnOptions(decorator, column, table)
+		return
+	}
+
+	// @CreateDateColumn
+	if strings.HasPrefix(decorator, "@CreateDateColumn") {
+		column.Type = "timestamp"
+		column.Default = "now()"
+		column.NotNull = true
+		return
+	}
+
+	// @UpdateDateColumn
+	if strings.HasPrefix(decorator, "@UpdateDateColumn") {
+		column.Type = "timestamp"
+		column.NotNull = true
+		if column.Comment != "" {
+			column.Comment += "; auto-update"
+		} else {
+			column.Comment = "auto-update"
+		}
+		return
+	}
+}
+
+// parseColumnOptions parses @Column decorator options
+func (r *Reader) parseColumnOptions(decorator string, column *models.Column, table *models.Table) {
+	// Extract content between parentheses
+	start := strings.Index(decorator, "(")
+	end := strings.LastIndex(decorator, ")")
+
+	if start == -1 || end == -1 || start >= end {
+		return
+	}
+
+	content := decorator[start+1 : end]
+
+	// Check for shorthand type: @Column('text')
+	if strings.HasPrefix(content, "'") || strings.HasPrefix(content, "\"") {
+		typeStr := strings.Trim(content, "'\"`")
+		column.Type = typeStr
+		return
+	}
+
+	// Parse options object
+	if strings.Contains(content, "type:") {
+		typeRegex := regexp.MustCompile(`type:\s*['"]([^'"]+)['"]`)
+		if matches := typeRegex.FindStringSubmatch(content); matches != nil {
+			column.Type = matches[1]
+		}
+	}
+
+	if strings.Contains(content, "nullable: true") || strings.Contains(content, "nullable:true") {
+		column.NotNull = false
+	}
+
+	if strings.Contains(content, "unique: true") || strings.Contains(content, "unique:true") {
+		uniqueConstraint := models.InitConstraint(
+			fmt.Sprintf("uq_%s", column.Name),
+			models.UniqueConstraint,
+		)
+		uniqueConstraint.Schema = table.Schema
+		uniqueConstraint.Table = table.Name
+		uniqueConstraint.Columns = []string{column.Name}
+		table.Constraints[uniqueConstraint.Name] = uniqueConstraint
+	}
+
+	if strings.Contains(content, "default:") {
+		defaultRegex := regexp.MustCompile(`default:\s*['"]?([^,}'"]+)['"]?`)
+		if matches := defaultRegex.FindStringSubmatch(content); matches != nil {
+			defaultValue := strings.TrimSpace(matches[1])
+			defaultValue = strings.Trim(defaultValue, "'\"")
+			column.Default = defaultValue
+		}
+	}
+}
+
+// resolveRelationships resolves TypeORM relationships
+func (r *Reader) resolveRelationships(entities []entityInfo, tableMap map[string]*models.Table, schema *models.Schema) {
+	// Track M2M relations that need join tables
+	type m2mRelation struct {
+		ownerEntity  string
+		targetEntity string
+		ownerField   string
+	}
+	m2mRelations := make([]m2mRelation, 0)
+
+	for _, entity := range entities {
+		table := tableMap[entity.name]
+		if table == nil {
+			continue
+		}
+
+		for _, field := range entity.fields {
+			// Handle @ManyToOne relations
+			if r.hasDecorator(field, "@ManyToOne") {
+				r.createManyToOneConstraint(field, entity.name, table, tableMap)
+			}
+
+			// Track @ManyToMany relations with @JoinTable
+			if r.hasDecorator(field, "@ManyToMany") && r.hasDecorator(field, "@JoinTable") {
+				targetEntity := r.extractRelationTarget(field)
+				if targetEntity != "" {
+					m2mRelations = append(m2mRelations, m2mRelation{
+						ownerEntity:  entity.name,
+						targetEntity: targetEntity,
+						ownerField:   field.name,
+					})
+				}
+			}
+		}
+	}
+
+	// Create join tables for M2M relations
+	for _, rel := range m2mRelations {
+		r.createManyToManyJoinTable(rel.ownerEntity, rel.targetEntity, tableMap, schema)
+	}
+}
+
+// hasDecorator checks if a field has a specific decorator
+func (r *Reader) hasDecorator(field fieldInfo, decoratorName string) bool {
+	for _, decorator := range field.decorators {
+		if strings.HasPrefix(decorator, decoratorName) {
+			return true
+		}
+	}
+	return false
+}
+
+// extractRelationTarget extracts the target entity from a relation decorator
+func (r *Reader) extractRelationTarget(field fieldInfo) string {
+	// Remove array brackets from type
+	targetType := strings.TrimSuffix(field.typeName, "[]")
+	targetType = strings.TrimSpace(targetType)
+	return targetType
+}
+
+// createManyToOneConstraint creates a foreign key constraint for @ManyToOne
+func (r *Reader) createManyToOneConstraint(field fieldInfo, entityName string, table *models.Table, tableMap map[string]*models.Table) {
+	targetEntity := r.extractRelationTarget(field)
+	if targetEntity == "" {
+		return
+	}
+
+	// Get target table to find its PK
+	targetTable := tableMap[targetEntity]
+	if targetTable == nil {
+		return
+	}
+
+	targetPK := r.getPrimaryKeyColumn(targetTable)
+	if targetPK == nil {
+		return
+	}
+
+	// Create FK column
+	fkColumnName := fmt.Sprintf("%sId", field.name)
+	fkColumn := models.InitColumn(fkColumnName, table.Name, table.Schema)
+	fkColumn.Type = targetPK.Type
+
+	// Check if nullable option is set in @ManyToOne decorator
+	isNullable := false
+	for _, decorator := range field.decorators {
+		if strings.Contains(decorator, "nullable: true") || strings.Contains(decorator, "nullable:true") {
+			isNullable = true
+			break
+		}
+	}
+	fkColumn.NotNull = !isNullable
+
+	table.Columns[fkColumnName] = fkColumn
+
+	// Create FK constraint
+	constraint := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", entityName, field.name),
+		models.ForeignKeyConstraint,
+	)
+	constraint.Schema = table.Schema
+	constraint.Table = table.Name
+	constraint.Columns = []string{fkColumnName}
+	constraint.ReferencedSchema = "public"
+	constraint.ReferencedTable = targetEntity
+	constraint.ReferencedColumns = []string{targetPK.Name}
+	constraint.OnDelete = "CASCADE"
+
+	table.Constraints[constraint.Name] = constraint
+}
+
+// createManyToManyJoinTable creates a join table for M2M relations
+func (r *Reader) createManyToManyJoinTable(entity1, entity2 string, tableMap map[string]*models.Table, schema *models.Schema) {
+	// TypeORM naming convention: entity1_entity2_entity1field
+	// We'll simplify to entity1_entity2
+	joinTableName := fmt.Sprintf("%s_%s", strings.ToLower(entity1), strings.ToLower(entity2))
+
+	// Check if join table already exists
+	if _, exists := tableMap[joinTableName]; exists {
+		return
+	}
+
+	// Get PKs from both tables
+	table1 := tableMap[entity1]
+	table2 := tableMap[entity2]
+	if table1 == nil || table2 == nil {
+		return
+	}
+
+	pk1 := r.getPrimaryKeyColumn(table1)
+	pk2 := r.getPrimaryKeyColumn(table2)
+	if pk1 == nil || pk2 == nil {
+		return
+	}
+
+	// Create join table
+	joinTable := models.InitTable(joinTableName, "public")
+
+	// Create FK columns
+	fkCol1Name := fmt.Sprintf("%sId", strings.ToLower(entity1))
+	fkCol1 := models.InitColumn(fkCol1Name, joinTableName, "public")
+	fkCol1.Type = pk1.Type
+	fkCol1.NotNull = true
+	fkCol1.IsPrimaryKey = true
+	joinTable.Columns[fkCol1Name] = fkCol1
+
+	fkCol2Name := fmt.Sprintf("%sId", strings.ToLower(entity2))
+	fkCol2 := models.InitColumn(fkCol2Name, joinTableName, "public")
+	fkCol2.Type = pk2.Type
+	fkCol2.NotNull = true
+	fkCol2.IsPrimaryKey = true
+	joinTable.Columns[fkCol2Name] = fkCol2
+
+	// Create composite PK constraint
+	pkConstraint := models.InitConstraint(
+		fmt.Sprintf("pk_%s", joinTableName),
+		models.PrimaryKeyConstraint,
+	)
+	pkConstraint.Schema = "public"
+	pkConstraint.Table = joinTableName
+	pkConstraint.Columns = []string{fkCol1Name, fkCol2Name}
+	joinTable.Constraints[pkConstraint.Name] = pkConstraint
+
+	// Create FK constraints
+	fk1 := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", joinTableName, entity1),
+		models.ForeignKeyConstraint,
+	)
+	fk1.Schema = "public"
+	fk1.Table = joinTableName
+	fk1.Columns = []string{fkCol1Name}
+	fk1.ReferencedSchema = "public"
+	fk1.ReferencedTable = entity1
+	fk1.ReferencedColumns = []string{pk1.Name}
+	fk1.OnDelete = "CASCADE"
+	joinTable.Constraints[fk1.Name] = fk1
+
+	fk2 := models.InitConstraint(
+		fmt.Sprintf("fk_%s_%s", joinTableName, entity2),
+		models.ForeignKeyConstraint,
+	)
+	fk2.Schema = "public"
+	fk2.Table = joinTableName
+	fk2.Columns = []string{fkCol2Name}
+	fk2.ReferencedSchema = "public"
+	fk2.ReferencedTable = entity2
+	fk2.ReferencedColumns = []string{pk2.Name}
+	fk2.OnDelete = "CASCADE"
+	joinTable.Constraints[fk2.Name] = fk2
+
+	// Add join table to schema
+	schema.Tables = append(schema.Tables, joinTable)
+	tableMap[joinTableName] = joinTable
+}
+
+// getPrimaryKeyColumn returns the primary key column of a table
+func (r *Reader) getPrimaryKeyColumn(table *models.Table) *models.Column {
+	if table == nil {
+		return nil
+	}
+
+	for _, col := range table.Columns {
+		if col.IsPrimaryKey {
+			return col
+		}
+	}
+
+	return nil
+}

pkg/readers/yaml/README.md

@@ -0,0 +1,159 @@
+# YAML Reader
+
+Reads database schema definitions from YAML files.
+
+## Overview
+
+The YAML Reader parses YAML files that define database schemas in RelSpec's canonical YAML format and converts them into RelSpec's internal database model representation.
+
+## Features
+
+- Reads RelSpec's standard YAML schema format
+- Human-readable alternative to JSON format
+- Supports complete schema representation including:
+  - Databases and schemas
+  - Tables, columns, and data types
+  - Constraints (PK, FK, unique, check)
+  - Indexes
+  - Relationships
+  - Views and sequences
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
+)
+
+func main() {
+    options := &readers.ReaderOptions{
+        FilePath: "/path/to/schema.yaml",
+    }
+
+    reader := yaml.NewReader(options)
+    db, err := reader.ReadDatabase()
+    if err != nil {
+        panic(err)
+    }
+
+    fmt.Printf("Found %d schemas\n", len(db.Schemas))
+}
+```
+
+### CLI Example
+
+```bash
+# Read YAML schema and convert to GORM models
+relspec --input yaml --in-file schema.yaml --output gorm --out-file models.go
+
+# Convert YAML to PostgreSQL DDL
+relspec --input yaml --in-file database.yaml --output pgsql --out-file schema.sql
+
+# Transform YAML to JSON
+relspec --input yaml --in-file schema.yaml --output json --out-file schema.json
+```
+
+## Example YAML Schema
+
+```yaml
+name: myapp
+database_type: postgresql
+schemas:
+  - name: public
+    tables:
+      - name: users
+        schema: public
+        columns:
+          id:
+            name: id
+            type: bigint
+            not_null: true
+            is_primary_key: true
+            auto_increment: true
+            sequence: 1
+          username:
+            name: username
+            type: varchar
+            length: 50
+            not_null: true
+            sequence: 2
+          email:
+            name: email
+            type: varchar
+            length: 100
+            not_null: true
+            sequence: 3
+        constraints:
+          pk_users:
+            name: pk_users
+            type: PRIMARY KEY
+            columns:
+              - id
+          uq_users_username:
+            name: uq_users_username
+            type: UNIQUE
+            columns:
+              - username
+        indexes:
+          idx_users_email:
+            name: idx_users_email
+            columns:
+              - email
+            unique: false
+            type: btree
+      - name: posts
+        schema: public
+        columns:
+          id:
+            name: id
+            type: bigint
+            not_null: true
+            is_primary_key: true
+            sequence: 1
+          user_id:
+            name: user_id
+            type: bigint
+            not_null: true
+            sequence: 2
+          title:
+            name: title
+            type: varchar
+            length: 200
+            not_null: true
+            sequence: 3
+        constraints:
+          fk_posts_user_id:
+            name: fk_posts_user_id
+            type: FOREIGN KEY
+            columns:
+              - user_id
+            referenced_table: users
+            referenced_schema: public
+            referenced_columns:
+              - id
+            on_delete: CASCADE
+            on_update: NO ACTION
+```
+
+## Schema Structure
+
+The YAML format mirrors RelSpec's internal model structure with human-readable syntax:
+
+- Database level: `name`, `database_type`, `schemas`
+- Schema level: `name`, `tables`, `views`, `sequences`
+- Table level: `name`, `schema`, `columns`, `constraints`, `indexes`, `relationships`
+- Column level: `name`, `type`, `length`, `not_null`, `default`, etc.
+
+## Notes
+
+- YAML format is more human-readable than JSON
+- Ideal for manual editing and version control
+- Comments are supported in YAML
+- Preserves complete schema information
+- Can be used for configuration and documentation

pkg/writers/bun/README.md

@@ -0,0 +1,129 @@
+# Bun Writer
+
+Generates Go source files with Bun model definitions from database schema information.
+
+## Overview
+
+The Bun Writer converts RelSpec's internal database model representation into Go source code with Bun struct definitions, complete with proper tags, relationships, and table configuration.
+
+## Features
+
+- Generates Bun-compatible Go structs
+- Creates proper `bun` struct tags
+- Adds relationship fields
+- Supports both single-file and multi-file output
+- Maps SQL types to Go types
+- Handles nullable fields with sql.Null* types
+- Generates table aliases
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/bun"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath:  "models.go",
+        PackageName: "models",
+    }
+
+    writer := bun.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate Bun models from PostgreSQL database
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output bun \
+  --out-file models.go \
+  --package models
+
+# Convert GORM models to Bun
+relspec --input gorm --in-file gorm_models.go --output bun --out-file bun_models.go
+
+# Multi-file output
+relspec --input json --in-file schema.json --output bun --out-file models/
+```
+
+## Generated Code Example
+
+```go
+package models
+
+import (
+    "time"
+    "database/sql"
+    "github.com/uptrace/bun"
+)
+
+type User struct {
+    bun.BaseModel `bun:"table:users,alias:u"`
+
+    ID        int64     `bun:"id,pk,autoincrement" json:"id"`
+    Username  string    `bun:"username,notnull,unique" json:"username"`
+    Email     string    `bun:"email,notnull" json:"email"`
+    Bio       sql.NullString `bun:"bio" json:"bio,omitempty"`
+    CreatedAt time.Time `bun:"created_at,notnull,default:now()" json:"created_at"`
+
+    // Relationships
+    Posts []*Post `bun:"rel:has-many,join:id=user_id" json:"posts,omitempty"`
+}
+
+type Post struct {
+    bun.BaseModel `bun:"table:posts,alias:p"`
+
+    ID      int64          `bun:"id,pk" json:"id"`
+    UserID  int64          `bun:"user_id,notnull" json:"user_id"`
+    Title   string         `bun:"title,notnull" json:"title"`
+    Content sql.NullString `bun:"content" json:"content,omitempty"`
+
+    // Belongs to
+    User *User `bun:"rel:belongs-to,join:user_id=id" json:"user,omitempty"`
+}
+```
+
+## Supported Bun Tags
+
+- `table` - Table name and alias
+- `column` - Column name (auto-derived if not specified)
+- `pk` - Primary key
+- `autoincrement` - Auto-increment
+- `notnull` - NOT NULL constraint
+- `unique` - Unique constraint
+- `default` - Default value
+- `rel` - Relationship definition
+- `type` - Explicit SQL type
+
+## Type Mapping
+
+| SQL Type | Go Type | Nullable Type |
+|----------|---------|---------------|
+| bigint | int64 | sql.NullInt64 |
+| integer | int | sql.NullInt32 |
+| varchar, text | string | sql.NullString |
+| boolean | bool | sql.NullBool |
+| timestamp | time.Time | sql.NullTime |
+| numeric | float64 | sql.NullFloat64 |
+
+## Notes
+
+- Model names are derived from table names (singularized, PascalCase)
+- Table aliases are auto-generated from table names
+- Multi-file mode: one file per table named `sql_{schema}_{table}.go`
+- Generated code is auto-formatted
+- JSON tags are automatically added

pkg/writers/bun/writer.go

@@ -41,12 +41,7 @@ func NewWriter(options *writers.WriterOptions) *Writer {
 // WriteDatabase writes a complete database as Bun models
 func (w *Writer) WriteDatabase(db *models.Database) error {
 	// Check if multi-file mode is enabled
-	multiFile := false
+	multiFile := w.shouldUseMultiFile()
-	if w.options.Metadata != nil {
-		if mf, ok := w.options.Metadata["multi_file"].(bool); ok {
-			multiFile = mf
-		}
-	}
 
 	if multiFile {
 		return w.writeMultiFile(db)
@@ -346,6 +341,41 @@ func (w *Writer) writeOutput(content string) error {
 	return nil
 }
 
+// shouldUseMultiFile determines whether to use multi-file mode based on metadata or output path
+func (w *Writer) shouldUseMultiFile() bool {
+	// Check if multi_file is explicitly set in metadata
+	if w.options.Metadata != nil {
+		if mf, ok := w.options.Metadata["multi_file"].(bool); ok {
+			return mf
+		}
+	}
+
+	// Auto-detect based on output path
+	if w.options.OutputPath == "" {
+		// No output path means stdout (single file)
+		return false
+	}
+
+	// Check if path ends with .go (explicit file)
+	if strings.HasSuffix(w.options.OutputPath, ".go") {
+		return false
+	}
+
+	// Check if path ends with directory separator
+	if strings.HasSuffix(w.options.OutputPath, "/") || strings.HasSuffix(w.options.OutputPath, "\\") {
+		return true
+	}
+
+	// Check if path exists and is a directory
+	info, err := os.Stat(w.options.OutputPath)
+	if err == nil && info.IsDir() {
+		return true
+	}
+
+	// Default to single file for ambiguous cases
+	return false
+}
+
 // createDatabaseRef creates a shallow copy of database without schemas to avoid circular references
 func (w *Writer) createDatabaseRef(db *models.Database) *models.Database {
 	return &models.Database{

pkg/writers/dbml/README.md

@@ -0,0 +1,161 @@
+# DBML Writer
+
+Generates Database Markup Language (DBML) files from database schema information.
+
+## Overview
+
+The DBML Writer converts RelSpec's internal database model representation into DBML syntax, suitable for use with dbdiagram.io and other DBML-compatible tools.
+
+## Features
+
+- Generates DBML syntax
+- Creates table definitions with columns
+- Defines relationships
+- Includes indexes
+- Adds notes and documentation
+- Supports enums
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/dbml"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "schema.dbml",
+    }
+
+    writer := dbml.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate DBML from PostgreSQL database
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output dbml \
+  --out-file schema.dbml
+
+# Convert GORM models to DBML
+relspec --input gorm --in-file models.go --output dbml --out-file database.dbml
+
+# Convert JSON to DBML for visualization
+relspec --input json --in-file schema.json --output dbml --out-file diagram.dbml
+```
+
+## Generated DBML Example
+
+```dbml
+Project MyDatabase {
+  database_type: 'PostgreSQL'
+}
+
+Table users {
+  id bigserial [pk, increment]
+  username varchar(50) [not null, unique]
+  email varchar(100) [not null]
+  bio text [null]
+  created_at timestamp [not null, default: `now()`]
+
+  Note: 'Users table'
+
+  indexes {
+    email [name: 'idx_users_email']
+  }
+}
+
+Table posts {
+  id bigserial [pk, increment]
+  user_id bigint [not null]
+  title varchar(200) [not null]
+  content text [null]
+  created_at timestamp [default: `now()`]
+
+  indexes {
+    user_id [name: 'idx_posts_user_id']
+    (user_id, created_at) [name: 'idx_posts_user_created']
+  }
+}
+
+Ref: posts.user_id > users.id [delete: cascade, update: no action]
+```
+
+## DBML Features
+
+### Table Definitions
+```dbml
+Table table_name {
+  column_name type [attributes]
+}
+```
+
+### Column Attributes
+- `pk` - Primary key
+- `increment` - Auto-increment
+- `not null` - NOT NULL constraint
+- `null` - Nullable (explicit)
+- `unique` - Unique constraint
+- `default: value` - Default value
+- `note: 'text'` - Column note
+
+### Relationships
+```dbml
+Ref: table1.column > table2.column
+Ref: table1.column < table2.column
+Ref: table1.column - table2.column
+```
+
+Relationship types:
+- `>` - Many-to-one
+- `<` - One-to-many
+- `-` - One-to-one
+
+Relationship actions:
+```dbml
+Ref: posts.user_id > users.id [delete: cascade, update: restrict]
+```
+
+### Indexes
+```dbml
+indexes {
+  column_name
+  (column1, column2) [name: 'idx_name', unique]
+}
+```
+
+## Type Mapping
+
+| SQL Type | DBML Type |
+|----------|-----------|
+| bigint | bigint |
+| integer | int |
+| varchar(n) | varchar(n) |
+| text | text |
+| boolean | boolean |
+| timestamp | timestamp |
+| date | date |
+| json | json |
+| uuid | uuid |
+
+## Notes
+
+- DBML is designed for database visualization
+- Can be imported into dbdiagram.io
+- Human-readable format
+- Schema names can be included in table names
+- Comments and notes are preserved
+- Ideal for documentation and sharing designs

pkg/writers/dctx/README.md

@@ -0,0 +1,111 @@
+# DCTX Writer
+
+Generates Clarion database dictionary (DCTX) files from database schema information.
+
+## Overview
+
+The DCTX Writer converts RelSpec's internal database model representation into Clarion dictionary XML format, used by the Clarion development platform.
+
+## Features
+
+- Generates DCTX XML format
+- Creates file (table) definitions
+- Defines fields (columns) with Clarion types
+- Includes keys (indexes)
+- Handles relationships
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/dctx"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "database.dctx",
+    }
+
+    writer := dctx.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate DCTX from PostgreSQL database (for Clarion migration)
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output dctx \
+  --out-file app.dctx
+
+# Convert GORM models to DCTX
+relspec --input gorm --in-file models.go --output dctx --out-file legacy.dctx
+
+# Convert JSON schema to DCTX
+relspec --input json --in-file schema.json --output dctx --out-file database.dctx
+```
+
+## Type Mapping
+
+Converts standard SQL types to Clarion types:
+
+| SQL Type | Clarion Type | Notes |
+|----------|--------------|-------|
+| VARCHAR(n) | STRING(n) | Fixed-length string |
+| TEXT | STRING | Variable length |
+| INTEGER | LONG | 32-bit integer |
+| BIGINT | DECIMAL(20,0) | Large integer |
+| SMALLINT | SHORT | 16-bit integer |
+| NUMERIC(p,s) | DECIMAL(p,s) | Decimal number |
+| REAL, FLOAT | REAL | Floating point |
+| BOOLEAN | BYTE | 0/1 value |
+| DATE | DATE | Date field |
+| TIME | TIME | Time field |
+| TIMESTAMP | LONG | Unix timestamp |
+
+## DCTX Structure
+
+DCTX files are XML-based with this structure:
+
+```xml
+<?xml version="1.0"?>
+<dictionary>
+  <file name="USERS" driver="TOPSPEED">
+    <record>
+      <field name="ID" type="LONG" />
+      <field name="USERNAME" type="STRING" bytes="50" />
+      <field name="EMAIL" type="STRING" bytes="100" />
+    </record>
+    <key name="KEY_PRIMARY" primary="true">
+      <field name="ID" />
+    </key>
+  </file>
+</dictionary>
+```
+
+## Features
+
+- File definitions (equivalent to tables)
+- Field definitions with Clarion-specific types
+- Key definitions (primary and foreign)
+- Relationships between files
+- Driver specifications (TOPSPEED, SQL, etc.)
+
+## Notes
+
+- DCTX is specific to Clarion development
+- Useful for legacy system integration
+- Field names are typically uppercase in Clarion
+- Supports Clarion-specific attributes
+- Can be imported into Clarion IDE

pkg/writers/drawdb/README.md

@@ -0,0 +1,182 @@
+# DrawDB Writer
+
+Generates DrawDB-compatible JSON files from database schema information.
+
+## Overview
+
+The DrawDB Writer converts RelSpec's internal database model representation into JSON format compatible with DrawDB, a free online database design tool.
+
+## Features
+
+- Generates DrawDB JSON format
+- Creates table and field definitions
+- Defines relationships
+- Includes visual layout information
+- Preserves constraints and indexes
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/drawdb"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "diagram.json",
+    }
+
+    writer := drawdb.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate DrawDB diagram from PostgreSQL database
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output drawdb \
+  --out-file diagram.json
+
+# Convert GORM models to DrawDB for visualization
+relspec --input gorm --in-file models.go --output drawdb --out-file design.json
+
+# Convert JSON schema to DrawDB
+relspec --input json --in-file schema.json --output drawdb --out-file diagram.json
+```
+
+## Generated JSON Example
+
+```json
+{
+  "version": "1.0",
+  "database": "PostgreSQL",
+  "tables": [
+    {
+      "id": "1",
+      "name": "users",
+      "x": 100,
+      "y": 100,
+      "fields": [
+        {
+          "id": "1",
+          "name": "id",
+          "type": "BIGINT",
+          "primary": true,
+          "autoIncrement": true,
+          "notNull": true
+        },
+        {
+          "id": "2",
+          "name": "username",
+          "type": "VARCHAR",
+          "size": 50,
+          "notNull": true,
+          "unique": true
+        },
+        {
+          "id": "3",
+          "name": "email",
+          "type": "VARCHAR",
+          "size": 100,
+          "notNull": true
+        }
+      ],
+      "indexes": [
+        {
+          "name": "idx_users_email",
+          "fields": ["email"]
+        }
+      ]
+    },
+    {
+      "id": "2",
+      "name": "posts",
+      "x": 400,
+      "y": 100,
+      "fields": [
+        {
+          "id": "1",
+          "name": "id",
+          "type": "BIGINT",
+          "primary": true
+        },
+        {
+          "id": "2",
+          "name": "user_id",
+          "type": "BIGINT",
+          "notNull": true
+        },
+        {
+          "id": "3",
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 200,
+          "notNull": true
+        }
+      ]
+    }
+  ],
+  "relationships": [
+    {
+      "id": "1",
+      "source": "2",
+      "target": "1",
+      "sourceField": "user_id",
+      "targetField": "id",
+      "type": "many-to-one",
+      "onDelete": "CASCADE"
+    }
+  ]
+}
+```
+
+## DrawDB Features
+
+### Table Properties
+- `id` - Unique table identifier
+- `name` - Table name
+- `x`, `y` - Position in diagram
+- `fields` - Array of field definitions
+- `indexes` - Array of index definitions
+
+### Field Properties
+- `id` - Unique field identifier
+- `name` - Field name
+- `type` - Data type (BIGINT, VARCHAR, etc.)
+- `size` - Length for string types
+- `primary` - Primary key flag
+- `notNull` - NOT NULL constraint
+- `unique` - Unique constraint
+- `autoIncrement` - Auto-increment flag
+- `default` - Default value
+
+### Relationship Properties
+- `id` - Unique relationship identifier
+- `source` - Source table ID
+- `target` - Target table ID
+- `sourceField` - Foreign key field
+- `targetField` - Referenced field
+- `type` - Relationship type (one-to-one, one-to-many, many-to-one)
+- `onDelete` - Delete action
+- `onUpdate` - Update action
+
+## Notes
+
+- DrawDB is available at drawdb.vercel.app
+- Generated files can be imported for visual editing
+- Visual positions (x, y) are auto-generated
+- Ideal for creating ERD diagrams
+- Supports modern database features
+- Free and open-source tool

pkg/writers/drizzle/README.md

@@ -0,0 +1,120 @@
+# Drizzle Writer
+
+Generates TypeScript/JavaScript files with Drizzle ORM schema definitions from database schema information.
+
+## Overview
+
+The Drizzle Writer converts RelSpec's internal database model representation into TypeScript source code with Drizzle ORM schema definitions, including tables, columns, relationships, and constraints.
+
+## Features
+
+- Generates Drizzle-compatible TypeScript schema
+- Supports PostgreSQL and MySQL schemas
+- Creates table definitions with proper column types
+- Generates relationship definitions
+- Handles constraints and indexes
+- Outputs formatted TypeScript code
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/drizzle"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "schema.ts",
+        Metadata: map[string]interface{}{
+            "database_type": "postgresql", // or "mysql"
+        },
+    }
+
+    writer := drizzle.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate Drizzle schema from PostgreSQL database
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output drizzle \
+  --out-file schema.ts
+
+# Convert GORM models to Drizzle
+relspec --input gorm --in-file models.go --output drizzle --out-file schema.ts
+
+# Convert JSON schema to Drizzle
+relspec --input json --in-file schema.json --output drizzle --out-file db/schema.ts
+```
+
+## Generated Code Example
+
+```typescript
+import { pgTable, serial, varchar, text, timestamp, integer } from 'drizzle-orm/pg-core';
+import { relations } from 'drizzle-orm';
+
+export const users = pgTable('users', {
+  id: serial('id').primaryKey(),
+  username: varchar('username', { length: 50 }).notNull().unique(),
+  email: varchar('email', { length: 100 }).notNull(),
+  bio: text('bio'),
+  createdAt: timestamp('created_at').notNull().defaultNow(),
+});
+
+export const posts = pgTable('posts', {
+  id: serial('id').primaryKey(),
+  userId: integer('user_id').notNull().references(() => users.id, { onDelete: 'cascade' }),
+  title: varchar('title', { length: 200 }).notNull(),
+  content: text('content'),
+});
+
+export const usersRelations = relations(users, ({ many }) => ({
+  posts: many(posts),
+}));
+
+export const postsRelations = relations(posts, ({ one }) => ({
+  user: one(users, {
+    fields: [posts.userId],
+    references: [users.id],
+  }),
+}));
+```
+
+## Supported Column Types
+
+### PostgreSQL
+- `serial`, `bigserial` - Auto-increment integers
+- `integer`, `bigint`, `smallint` - Integer types
+- `varchar`, `text` - String types
+- `boolean` - Boolean
+- `timestamp`, `date`, `time` - Date/time types
+- `json`, `jsonb` - JSON types
+- `uuid` - UUID type
+
+### MySQL
+- `int`, `bigint`, `smallint` - Integer types
+- `varchar`, `text` - String types
+- `boolean` - Boolean
+- `datetime`, `timestamp` - Date/time types
+- `json` - JSON type
+
+## Notes
+
+- Table names and column names are preserved as-is
+- Relationships are generated as separate relation definitions
+- Constraint actions (CASCADE, etc.) are included in references
+- Schema names other than 'public' are supported
+- Output is formatted TypeScript code

pkg/writers/drizzle/template_data.go

@@ -0,0 +1,221 @@
+package drizzle
+
+import (
+	"sort"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// TemplateData represents the data passed to the template for code generation
+type TemplateData struct {
+	Imports []string
+	Enums   []*EnumData
+	Tables  []*TableData
+}
+
+// EnumData represents an enum in the schema
+type EnumData struct {
+	Name       string   // Enum name (PascalCase)
+	VarName    string   // Variable name for the enum (camelCase)
+	Values     []string // Enum values
+	ValuesStr  string   // Comma-separated quoted values for pgEnum()
+	TypeUnion  string   // TypeScript union type (e.g., "'admin' | 'user' | 'guest'")
+	SchemaName string   // Schema name
+}
+
+// TableData represents a table in the template
+type TableData struct {
+	Name              string        // Table variable name (camelCase, e.g., users)
+	TableName         string        // Actual database table name (e.g., users)
+	TypeName          string        // TypeScript type name (PascalCase, e.g., Users)
+	Columns           []*ColumnData // Column definitions
+	Indexes           []*IndexData  // Index definitions
+	Comment           string        // Table comment
+	SchemaName        string        // Schema name
+	NeedsSQLTag       bool          // Whether we need to import 'sql' from drizzle-orm
+	IndexColumnFields []string      // Column field names used in indexes (for destructuring)
+}
+
+// ColumnData represents a column in a table
+type ColumnData struct {
+	Name           string // Column name in database
+	FieldName      string // Field name in TypeScript (camelCase)
+	DrizzleChain   string // Complete Drizzle column chain (e.g., "integer('id').primaryKey()")
+	TypeScriptType string // TypeScript type for interface (e.g., "string", "number | null")
+	IsForeignKey   bool   // Whether this is a foreign key
+	ReferencesLine string // The .references() line if FK
+	Comment        string // Column comment
+}
+
+// IndexData represents an index definition
+type IndexData struct {
+	Name       string   // Index name
+	Columns    []string // Column names
+	IsUnique   bool     // Whether it's a unique index
+	Definition string   // Complete index definition line
+}
+
+// NewTemplateData creates a new TemplateData
+func NewTemplateData() *TemplateData {
+	return &TemplateData{
+		Imports: make([]string, 0),
+		Enums:   make([]*EnumData, 0),
+		Tables:  make([]*TableData, 0),
+	}
+}
+
+// AddImport adds an import to the template data (deduplicates automatically)
+func (td *TemplateData) AddImport(importLine string) {
+	// Check if already exists
+	for _, imp := range td.Imports {
+		if imp == importLine {
+			return
+		}
+	}
+	td.Imports = append(td.Imports, importLine)
+}
+
+// AddEnum adds an enum to the template data
+func (td *TemplateData) AddEnum(enum *EnumData) {
+	td.Enums = append(td.Enums, enum)
+}
+
+// AddTable adds a table to the template data
+func (td *TemplateData) AddTable(table *TableData) {
+	td.Tables = append(td.Tables, table)
+}
+
+// FinalizeImports sorts imports
+func (td *TemplateData) FinalizeImports() {
+	sort.Strings(td.Imports)
+}
+
+// NewEnumData creates EnumData from a models.Enum
+func NewEnumData(enum *models.Enum, tm *TypeMapper) *EnumData {
+	// Keep enum name as-is (it should already be PascalCase from the source)
+	enumName := enum.Name
+	// Variable name is camelCase version
+	varName := tm.ToCamelCase(enum.Name)
+
+	// Format values as comma-separated quoted strings for pgEnum()
+	quotedValues := make([]string, len(enum.Values))
+	for i, v := range enum.Values {
+		quotedValues[i] = "'" + v + "'"
+	}
+	valuesStr := ""
+	for i, qv := range quotedValues {
+		if i > 0 {
+			valuesStr += ", "
+		}
+		valuesStr += qv
+	}
+
+	// Build TypeScript union type (e.g., "'admin' | 'user' | 'guest'")
+	typeUnion := ""
+	for i, qv := range quotedValues {
+		if i > 0 {
+			typeUnion += " | "
+		}
+		typeUnion += qv
+	}
+
+	return &EnumData{
+		Name:       enumName,
+		VarName:    varName,
+		Values:     enum.Values,
+		ValuesStr:  valuesStr,
+		TypeUnion:  typeUnion,
+		SchemaName: enum.Schema,
+	}
+}
+
+// NewTableData creates TableData from a models.Table
+func NewTableData(table *models.Table, tm *TypeMapper) *TableData {
+	tableName := tm.ToCamelCase(table.Name)
+	typeName := tm.ToPascalCase(table.Name)
+
+	return &TableData{
+		Name:       tableName,
+		TableName:  table.Name,
+		TypeName:   typeName,
+		Columns:    make([]*ColumnData, 0),
+		Indexes:    make([]*IndexData, 0),
+		Comment:    formatComment(table.Description, table.Comment),
+		SchemaName: table.Schema,
+	}
+}
+
+// AddColumn adds a column to the table data
+func (td *TableData) AddColumn(col *ColumnData) {
+	td.Columns = append(td.Columns, col)
+}
+
+// AddIndex adds an index to the table data
+func (td *TableData) AddIndex(idx *IndexData) {
+	td.Indexes = append(td.Indexes, idx)
+}
+
+// NewColumnData creates ColumnData from a models.Column
+func NewColumnData(col *models.Column, table *models.Table, tm *TypeMapper, isEnum bool) *ColumnData {
+	fieldName := tm.ToCamelCase(col.Name)
+	drizzleChain := tm.BuildColumnChain(col, table, isEnum)
+
+	return &ColumnData{
+		Name:         col.Name,
+		FieldName:    fieldName,
+		DrizzleChain: drizzleChain,
+		Comment:      formatComment(col.Description, col.Comment),
+	}
+}
+
+// NewIndexData creates IndexData from a models.Index
+func NewIndexData(index *models.Index, tableVar string, tm *TypeMapper) *IndexData {
+	indexName := tm.ToCamelCase(index.Name) + "Idx"
+
+	// Build column references as field names (will be used with destructuring)
+	colRefs := make([]string, len(index.Columns))
+	for i, colName := range index.Columns {
+		// Use just the field name for destructured parameters
+		colRefs[i] = tm.ToCamelCase(colName)
+	}
+
+	// Build the complete definition
+	// Example: index('email_idx').on(email)
+	// or: uniqueIndex('unique_email_idx').on(email)
+	definition := ""
+	if index.Unique {
+		definition = "uniqueIndex('" + index.Name + "').on(" + joinStrings(colRefs, ", ") + ")"
+	} else {
+		definition = "index('" + index.Name + "').on(" + joinStrings(colRefs, ", ") + ")"
+	}
+
+	return &IndexData{
+		Name:       indexName,
+		Columns:    index.Columns,
+		IsUnique:   index.Unique,
+		Definition: definition,
+	}
+}
+
+// formatComment combines description and comment into a single comment string
+func formatComment(description, comment string) string {
+	if description != "" && comment != "" {
+		return description + " - " + comment
+	}
+	if description != "" {
+		return description
+	}
+	return comment
+}
+
+// joinStrings joins a slice of strings with a separator
+func joinStrings(strs []string, sep string) string {
+	result := ""
+	for i, s := range strs {
+		if i > 0 {
+			result += sep
+		}
+		result += s
+	}
+	return result
+}

pkg/writers/drizzle/templates.go

@@ -0,0 +1,64 @@
+package drizzle
+
+import (
+	"bytes"
+	"text/template"
+)
+
+// schemaTemplate defines the template for generating Drizzle schemas
+const schemaTemplate = `// Code generated by relspecgo. DO NOT EDIT.
+{{range .Imports}}{{.}}
+{{end}}
+{{if .Enums}}
+// Enums
+{{range .Enums}}export const {{.VarName}} = pgEnum('{{.Name}}', [{{.ValuesStr}}]);
+export type {{.Name}} = {{.TypeUnion}};
+{{end}}
+{{end}}
+{{range .Tables}}// Table: {{.TableName}}{{if .Comment}} - {{.Comment}}{{end}}
+export interface {{.TypeName}} {
+{{- range $i, $col := .Columns}}
+  {{$col.FieldName}}: {{$col.TypeScriptType}};{{if $col.Comment}} // {{$col.Comment}}{{end}}
+{{- end}}
+}
+
+export const {{.Name}} = pgTable('{{.TableName}}', {
+{{- range $i, $col := .Columns}}
+  {{$col.FieldName}}: {{$col.DrizzleChain}},{{if $col.Comment}} // {{$col.Comment}}{{end}}
+{{- end}}
+}{{if .Indexes}}{{if .IndexColumnFields}}, ({ {{range $i, $field := .IndexColumnFields}}{{if $i}}, {{end}}{{$field}}{{end}} }) => [{{else}}, (table) => [{{end}}
+{{- range $i, $idx := .Indexes}}
+  {{$idx.Definition}},
+{{- end}}
+]{{end}});
+
+export type New{{.TypeName}} = typeof {{.Name}}.$inferInsert;
+{{end}}`
+
+// Templates holds the parsed templates
+type Templates struct {
+	schemaTmpl *template.Template
+}
+
+// NewTemplates creates and parses the templates
+func NewTemplates() (*Templates, error) {
+	schemaTmpl, err := template.New("schema").Parse(schemaTemplate)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Templates{
+		schemaTmpl: schemaTmpl,
+	}, nil
+}
+
+// GenerateCode executes the template with the given data
+func (t *Templates) GenerateCode(data *TemplateData) (string, error) {
+	var buf bytes.Buffer
+	err := t.schemaTmpl.Execute(&buf, data)
+	if err != nil {
+		return "", err
+	}
+
+	return buf.String(), nil
+}

pkg/writers/drizzle/type_mapper.go

@@ -0,0 +1,318 @@
+package drizzle
+
+import (
+	"fmt"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// TypeMapper handles SQL to Drizzle type conversions
+type TypeMapper struct{}
+
+// NewTypeMapper creates a new TypeMapper instance
+func NewTypeMapper() *TypeMapper {
+	return &TypeMapper{}
+}
+
+// SQLTypeToDrizzle converts SQL types to Drizzle column type functions
+// Returns the Drizzle column constructor (e.g., "integer", "varchar", "text")
+func (tm *TypeMapper) SQLTypeToDrizzle(sqlType string) string {
+	sqlTypeLower := strings.ToLower(sqlType)
+
+	// PostgreSQL type mapping to Drizzle
+	typeMap := map[string]string{
+		// Integer types
+		"integer":  "integer",
+		"int":      "integer",
+		"int4":     "integer",
+		"smallint": "smallint",
+		"int2":     "smallint",
+		"bigint":   "bigint",
+		"int8":     "bigint",
+
+		// Serial types
+		"serial":      "serial",
+		"serial4":     "serial",
+		"smallserial": "smallserial",
+		"serial2":     "smallserial",
+		"bigserial":   "bigserial",
+		"serial8":     "bigserial",
+
+		// Numeric types
+		"numeric":          "numeric",
+		"decimal":          "numeric",
+		"real":             "real",
+		"float4":           "real",
+		"double precision": "doublePrecision",
+		"float":            "doublePrecision",
+		"float8":           "doublePrecision",
+
+		// Character types
+		"text":              "text",
+		"varchar":           "varchar",
+		"character varying": "varchar",
+		"char":              "char",
+		"character":         "char",
+
+		// Boolean
+		"boolean": "boolean",
+		"bool":    "boolean",
+
+		// Binary
+		"bytea": "bytea",
+
+		// JSON types
+		"json":  "json",
+		"jsonb": "jsonb",
+
+		// Date/Time types
+		"time":        "time",
+		"timetz":      "time",
+		"timestamp":   "timestamp",
+		"timestamptz": "timestamp",
+		"date":        "date",
+		"interval":    "interval",
+
+		// UUID
+		"uuid": "uuid",
+
+		// Geometric types
+		"point": "point",
+		"line":  "line",
+	}
+
+	// Check for exact match first
+	if drizzleType, ok := typeMap[sqlTypeLower]; ok {
+		return drizzleType
+	}
+
+	// Check for partial matches (e.g., "varchar(255)" -> "varchar")
+	for sqlPattern, drizzleType := range typeMap {
+		if strings.HasPrefix(sqlTypeLower, sqlPattern) {
+			return drizzleType
+		}
+	}
+
+	// Default to text for unknown types
+	return "text"
+}
+
+// BuildColumnChain builds the complete column definition chain for Drizzle
+// Example: integer('id').primaryKey().notNull()
+func (tm *TypeMapper) BuildColumnChain(col *models.Column, table *models.Table, isEnum bool) string {
+	var parts []string
+
+	// Determine Drizzle column type
+	var drizzleType string
+	if isEnum {
+		// For enum types, use the type name directly
+		drizzleType = fmt.Sprintf("pgEnum('%s')", col.Type)
+	} else {
+		drizzleType = tm.SQLTypeToDrizzle(col.Type)
+	}
+
+	// Start with column type and name
+	// Note: column name is passed as first argument to the column constructor
+	base := fmt.Sprintf("%s('%s')", drizzleType, col.Name)
+	parts = append(parts, base)
+
+	// Add column modifiers in order
+	modifiers := tm.buildColumnModifiers(col, table)
+	if len(modifiers) > 0 {
+		parts = append(parts, modifiers...)
+	}
+
+	return strings.Join(parts, ".")
+}
+
+// buildColumnModifiers builds an array of method calls for column modifiers
+func (tm *TypeMapper) buildColumnModifiers(col *models.Column, table *models.Table) []string {
+	var modifiers []string
+
+	// Primary key
+	if col.IsPrimaryKey {
+		modifiers = append(modifiers, "primaryKey()")
+	}
+
+	// Not null constraint
+	if col.NotNull && !col.IsPrimaryKey {
+		modifiers = append(modifiers, "notNull()")
+	}
+
+	// Unique constraint (check if there's a single-column unique constraint)
+	if tm.hasUniqueConstraint(col.Name, table) {
+		modifiers = append(modifiers, "unique()")
+	}
+
+	// Default value
+	if col.AutoIncrement {
+		// For auto-increment, use generatedAlwaysAsIdentity()
+		modifiers = append(modifiers, "generatedAlwaysAsIdentity()")
+	} else if col.Default != nil {
+		defaultValue := tm.formatDefaultValue(col.Default)
+		if defaultValue != "" {
+			modifiers = append(modifiers, fmt.Sprintf("default(%s)", defaultValue))
+		}
+	}
+
+	return modifiers
+}
+
+// formatDefaultValue formats a default value for Drizzle
+func (tm *TypeMapper) formatDefaultValue(defaultValue any) string {
+	switch v := defaultValue.(type) {
+	case string:
+		if v == "now()" || v == "CURRENT_TIMESTAMP" {
+			return "sql`now()`"
+		} else if v == "gen_random_uuid()" || strings.Contains(strings.ToLower(v), "uuid") {
+			return "sql`gen_random_uuid()`"
+		} else {
+			// Try to parse as number first
+			// Check if it's a numeric string that should be a number
+			if isNumericString(v) {
+				return v
+			}
+			// String literal
+			return fmt.Sprintf("'%s'", strings.ReplaceAll(v, "'", "\\'"))
+		}
+	case bool:
+		if v {
+			return "true"
+		}
+		return "false"
+	case int, int64, int32, int16, int8:
+		return fmt.Sprintf("%v", v)
+	case float32, float64:
+		return fmt.Sprintf("%v", v)
+	default:
+		return fmt.Sprintf("%v", v)
+	}
+}
+
+// isNumericString checks if a string represents a number
+func isNumericString(s string) bool {
+	if s == "" {
+		return false
+	}
+	// Simple check for numeric strings
+	for i, c := range s {
+		if i == 0 && c == '-' {
+			continue // Allow negative sign at start
+		}
+		if c < '0' || c > '9' {
+			if c != '.' {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+// hasUniqueConstraint checks if a column has a unique constraint
+func (tm *TypeMapper) hasUniqueConstraint(colName string, table *models.Table) bool {
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.UniqueConstraint &&
+			len(constraint.Columns) == 1 &&
+			constraint.Columns[0] == colName {
+			return true
+		}
+	}
+	return false
+}
+
+// BuildReferencesChain builds the .references() chain for foreign key columns
+func (tm *TypeMapper) BuildReferencesChain(fk *models.Constraint, referencedTable string) string {
+	// Example: .references(() => users.id)
+	if len(fk.ReferencedColumns) > 0 {
+		// Use the referenced table variable name (camelCase)
+		refTableVar := tm.ToCamelCase(referencedTable)
+		refColumn := fk.ReferencedColumns[0]
+		return fmt.Sprintf("references(() => %s.%s)", refTableVar, refColumn)
+	}
+	return ""
+}
+
+// ToCamelCase converts snake_case or PascalCase to camelCase
+func (tm *TypeMapper) ToCamelCase(s string) string {
+	if s == "" {
+		return s
+	}
+
+	// Check if it's snake_case
+	if strings.Contains(s, "_") {
+		parts := strings.Split(s, "_")
+		if len(parts) == 0 {
+			return s
+		}
+
+		// First part stays lowercase
+		result := strings.ToLower(parts[0])
+
+		// Capitalize first letter of remaining parts
+		for i := 1; i < len(parts); i++ {
+			if len(parts[i]) > 0 {
+				result += strings.ToUpper(parts[i][:1]) + strings.ToLower(parts[i][1:])
+			}
+		}
+
+		return result
+	}
+
+	// Otherwise, assume it's PascalCase - just lowercase the first letter
+	return strings.ToLower(s[:1]) + s[1:]
+}
+
+// ToPascalCase converts snake_case to PascalCase
+func (tm *TypeMapper) ToPascalCase(s string) string {
+	parts := strings.Split(s, "_")
+	var result string
+
+	for _, part := range parts {
+		if len(part) > 0 {
+			result += strings.ToUpper(part[:1]) + strings.ToLower(part[1:])
+		}
+	}
+
+	return result
+}
+
+// DrizzleTypeToTypeScript converts Drizzle column types to TypeScript types
+func (tm *TypeMapper) DrizzleTypeToTypeScript(drizzleType string, isEnum bool, enumName string) string {
+	if isEnum {
+		return enumName
+	}
+
+	typeMap := map[string]string{
+		"integer":         "number",
+		"bigint":          "number",
+		"smallint":        "number",
+		"serial":          "number",
+		"bigserial":       "number",
+		"smallserial":     "number",
+		"numeric":         "number",
+		"real":            "number",
+		"doublePrecision": "number",
+		"text":            "string",
+		"varchar":         "string",
+		"char":            "string",
+		"boolean":         "boolean",
+		"bytea":           "Buffer",
+		"json":            "any",
+		"jsonb":           "any",
+		"timestamp":       "Date",
+		"date":            "Date",
+		"time":            "Date",
+		"interval":        "string",
+		"uuid":            "string",
+		"point":           "{ x: number; y: number }",
+		"line":            "{ a: number; b: number; c: number }",
+	}
+
+	if tsType, ok := typeMap[drizzleType]; ok {
+		return tsType
+	}
+
+	// Default to any for unknown types
+	return "any"
+}

pkg/writers/drizzle/writer.go

@@ -0,0 +1,543 @@
+package drizzle
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+// Writer implements the writers.Writer interface for Drizzle ORM
+type Writer struct {
+	options    *writers.WriterOptions
+	typeMapper *TypeMapper
+	templates  *Templates
+}
+
+// NewWriter creates a new Drizzle writer with the given options
+func NewWriter(options *writers.WriterOptions) *Writer {
+	w := &Writer{
+		options:    options,
+		typeMapper: NewTypeMapper(),
+	}
+
+	// Initialize templates
+	tmpl, err := NewTemplates()
+	if err != nil {
+		// Should not happen with embedded templates
+		panic(fmt.Sprintf("failed to initialize templates: %v", err))
+	}
+	w.templates = tmpl
+
+	return w
+}
+
+// WriteDatabase writes a complete database as Drizzle schema
+func (w *Writer) WriteDatabase(db *models.Database) error {
+	// Check if multi-file mode is enabled
+	multiFile := w.shouldUseMultiFile()
+
+	if multiFile {
+		return w.writeMultiFile(db)
+	}
+
+	return w.writeSingleFile(db)
+}
+
+// WriteSchema writes a schema as Drizzle schema
+func (w *Writer) WriteSchema(schema *models.Schema) error {
+	// Create a temporary database with just this schema
+	db := models.InitDatabase(schema.Name)
+	db.Schemas = []*models.Schema{schema}
+
+	return w.WriteDatabase(db)
+}
+
+// WriteTable writes a single table as a Drizzle schema
+func (w *Writer) WriteTable(table *models.Table) error {
+	// Create a temporary schema and database
+	schema := models.InitSchema(table.Schema)
+	schema.Tables = []*models.Table{table}
+
+	db := models.InitDatabase(schema.Name)
+	db.Schemas = []*models.Schema{schema}
+
+	return w.WriteDatabase(db)
+}
+
+// writeSingleFile writes all tables to a single file
+func (w *Writer) writeSingleFile(db *models.Database) error {
+	templateData := NewTemplateData()
+
+	// Build enum map for quick lookup
+	enumMap := w.buildEnumMap(db)
+
+	// Process all schemas
+	for _, schema := range db.Schemas {
+		// Add enums
+		for _, enum := range schema.Enums {
+			enumData := NewEnumData(enum, w.typeMapper)
+			templateData.AddEnum(enumData)
+		}
+
+		// Add tables
+		for _, table := range schema.Tables {
+			tableData := w.buildTableData(table, schema, db, enumMap)
+			templateData.AddTable(tableData)
+		}
+	}
+
+	// Add imports
+	w.addImports(templateData, db)
+
+	// Finalize imports
+	templateData.FinalizeImports()
+
+	// Generate code
+	code, err := w.templates.GenerateCode(templateData)
+	if err != nil {
+		return fmt.Errorf("failed to generate code: %w", err)
+	}
+
+	// Write output
+	return w.writeOutput(code)
+}
+
+// writeMultiFile writes each table to a separate file
+func (w *Writer) writeMultiFile(db *models.Database) error {
+	// Ensure output path is a directory
+	if w.options.OutputPath == "" {
+		return fmt.Errorf("output path is required for multi-file mode")
+	}
+
+	// Create output directory if it doesn't exist
+	if err := os.MkdirAll(w.options.OutputPath, 0755); err != nil {
+		return fmt.Errorf("failed to create output directory: %w", err)
+	}
+
+	// Build enum map for quick lookup
+	enumMap := w.buildEnumMap(db)
+
+	// Process all schemas
+	for _, schema := range db.Schemas {
+		// Write enums file if there are any
+		if len(schema.Enums) > 0 {
+			if err := w.writeEnumsFile(schema); err != nil {
+				return err
+			}
+		}
+
+		// Write each table to a separate file
+		for _, table := range schema.Tables {
+			if err := w.writeTableFile(table, schema, db, enumMap); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// writeEnumsFile writes all enums to a separate file
+func (w *Writer) writeEnumsFile(schema *models.Schema) error {
+	templateData := NewTemplateData()
+
+	// Add enums
+	for _, enum := range schema.Enums {
+		enumData := NewEnumData(enum, w.typeMapper)
+		templateData.AddEnum(enumData)
+	}
+
+	// Add imports for enums
+	templateData.AddImport("import { pgEnum } from 'drizzle-orm/pg-core';")
+
+	// Generate code
+	code, err := w.templates.GenerateCode(templateData)
+	if err != nil {
+		return fmt.Errorf("failed to generate enums code: %w", err)
+	}
+
+	// Write to enums.ts file
+	filename := filepath.Join(w.options.OutputPath, "enums.ts")
+	return os.WriteFile(filename, []byte(code), 0644)
+}
+
+// writeTableFile writes a single table to its own file
+func (w *Writer) writeTableFile(table *models.Table, schema *models.Schema, db *models.Database, enumMap map[string]bool) error {
+	templateData := NewTemplateData()
+
+	// Build table data
+	tableData := w.buildTableData(table, schema, db, enumMap)
+	templateData.AddTable(tableData)
+
+	// Add imports
+	w.addImports(templateData, db)
+
+	// If there are enums, add import from enums file
+	if len(schema.Enums) > 0 && w.tableUsesEnum(table, enumMap) {
+		// Import enum definitions from enums.ts
+		enumNames := w.getTableEnumNames(table, schema, enumMap)
+		if len(enumNames) > 0 {
+			importLine := fmt.Sprintf("import { %s } from './enums';", strings.Join(enumNames, ", "))
+			templateData.AddImport(importLine)
+		}
+	}
+
+	// Finalize imports
+	templateData.FinalizeImports()
+
+	// Generate code
+	code, err := w.templates.GenerateCode(templateData)
+	if err != nil {
+		return fmt.Errorf("failed to generate code for table %s: %w", table.Name, err)
+	}
+
+	// Generate filename: {tableName}.ts
+	filename := filepath.Join(w.options.OutputPath, table.Name+".ts")
+	return os.WriteFile(filename, []byte(code), 0644)
+}
+
+// buildTableData builds TableData from a models.Table
+func (w *Writer) buildTableData(table *models.Table, schema *models.Schema, db *models.Database, enumMap map[string]bool) *TableData {
+	tableData := NewTableData(table, w.typeMapper)
+
+	// Add columns
+	for _, colName := range w.getSortedColumnNames(table) {
+		col := table.Columns[colName]
+
+		// Check if this column uses an enum
+		isEnum := enumMap[col.Type]
+
+		columnData := NewColumnData(col, table, w.typeMapper, isEnum)
+
+		// Set TypeScript type
+		drizzleType := w.typeMapper.SQLTypeToDrizzle(col.Type)
+		enumName := ""
+		if isEnum {
+			// For enums, use the enum type name
+			enumName = col.Type
+		}
+		baseType := w.typeMapper.DrizzleTypeToTypeScript(drizzleType, isEnum, enumName)
+
+		// Add null union if column is nullable
+		if !col.NotNull && !col.IsPrimaryKey {
+			columnData.TypeScriptType = baseType + " | null"
+		} else {
+			columnData.TypeScriptType = baseType
+		}
+
+		// Check if this column is a foreign key
+		if fk := w.getForeignKeyForColumn(col.Name, table); fk != nil {
+			columnData.IsForeignKey = true
+			refTableName := fk.ReferencedTable
+			refChain := w.typeMapper.BuildReferencesChain(fk, refTableName)
+			if refChain != "" {
+				columnData.ReferencesLine = "." + refChain
+				// Append to the drizzle chain
+				columnData.DrizzleChain += columnData.ReferencesLine
+			}
+		}
+
+		tableData.AddColumn(columnData)
+	}
+
+	// Collect all column field names that are used in indexes
+	indexColumnFields := make(map[string]bool)
+
+	// Add indexes (excluding single-column unique indexes, which are handled inline)
+	for _, index := range table.Indexes {
+		// Skip single-column unique indexes (handled by .unique() modifier)
+		if index.Unique && len(index.Columns) == 1 {
+			continue
+		}
+
+		// Track which columns are used in indexes
+		for _, colName := range index.Columns {
+			// Find the field name for this column
+			if col, exists := table.Columns[colName]; exists {
+				fieldName := w.typeMapper.ToCamelCase(col.Name)
+				indexColumnFields[fieldName] = true
+			}
+		}
+
+		indexData := NewIndexData(index, tableData.Name, w.typeMapper)
+		tableData.AddIndex(indexData)
+	}
+
+	// Add multi-column unique constraints as unique indexes
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.UniqueConstraint && len(constraint.Columns) > 1 {
+			// Create a unique index for this constraint
+			indexData := &IndexData{
+				Name:     w.typeMapper.ToCamelCase(constraint.Name) + "Idx",
+				Columns:  constraint.Columns,
+				IsUnique: true,
+			}
+
+			// Track which columns are used in indexes
+			for _, colName := range constraint.Columns {
+				if col, exists := table.Columns[colName]; exists {
+					fieldName := w.typeMapper.ToCamelCase(col.Name)
+					indexColumnFields[fieldName] = true
+				}
+			}
+
+			// Build column references as field names (for destructuring)
+			colRefs := make([]string, len(constraint.Columns))
+			for i, colName := range constraint.Columns {
+				if col, exists := table.Columns[colName]; exists {
+					colRefs[i] = w.typeMapper.ToCamelCase(col.Name)
+				} else {
+					colRefs[i] = w.typeMapper.ToCamelCase(colName)
+				}
+			}
+
+			indexData.Definition = "uniqueIndex('" + constraint.Name + "').on(" + joinStrings(colRefs, ", ") + ")"
+			tableData.AddIndex(indexData)
+		}
+	}
+
+	// Convert index column fields map to sorted slice
+	if len(indexColumnFields) > 0 {
+		fields := make([]string, 0, len(indexColumnFields))
+		for field := range indexColumnFields {
+			fields = append(fields, field)
+		}
+		// Sort for consistent output
+		sortStrings(fields)
+		tableData.IndexColumnFields = fields
+	}
+
+	return tableData
+}
+
+// sortStrings sorts a slice of strings in place
+func sortStrings(strs []string) {
+	for i := 0; i < len(strs); i++ {
+		for j := i + 1; j < len(strs); j++ {
+			if strs[i] > strs[j] {
+				strs[i], strs[j] = strs[j], strs[i]
+			}
+		}
+	}
+}
+
+// addImports adds the necessary imports to the template data
+func (w *Writer) addImports(templateData *TemplateData, db *models.Database) {
+	// Determine which Drizzle imports we need
+	needsPgTable := len(templateData.Tables) > 0
+	needsPgEnum := len(templateData.Enums) > 0
+	needsIndex := false
+	needsUniqueIndex := false
+	needsSQL := false
+
+	// Check what we need based on tables
+	for _, table := range templateData.Tables {
+		for _, index := range table.Indexes {
+			if index.IsUnique {
+				needsUniqueIndex = true
+			} else {
+				needsIndex = true
+			}
+		}
+
+		// Check if any column uses SQL default values
+		for _, col := range table.Columns {
+			if strings.Contains(col.DrizzleChain, "sql`") {
+				needsSQL = true
+			}
+		}
+	}
+
+	// Build the import statement
+	imports := make([]string, 0)
+
+	if needsPgTable {
+		imports = append(imports, "pgTable")
+	}
+	if needsPgEnum {
+		imports = append(imports, "pgEnum")
+	}
+
+	// Add column types - for now, add common ones
+	// TODO: Could be optimized to only include used types
+	columnTypes := []string{
+		"integer", "bigint", "smallint",
+		"serial", "bigserial", "smallserial",
+		"text", "varchar", "char",
+		"boolean", "numeric", "real", "doublePrecision",
+		"timestamp", "date", "time", "interval",
+		"json", "jsonb", "uuid", "bytea",
+	}
+	imports = append(imports, columnTypes...)
+
+	if needsIndex {
+		imports = append(imports, "index")
+	}
+	if needsUniqueIndex {
+		imports = append(imports, "uniqueIndex")
+	}
+
+	importLine := "import { " + strings.Join(imports, ", ") + " } from 'drizzle-orm/pg-core';"
+	templateData.AddImport(importLine)
+
+	// Add SQL import if needed
+	if needsSQL {
+		templateData.AddImport("import { sql } from 'drizzle-orm';")
+	}
+}
+
+// buildEnumMap builds a map of enum type names for quick lookup
+func (w *Writer) buildEnumMap(db *models.Database) map[string]bool {
+	enumMap := make(map[string]bool)
+
+	for _, schema := range db.Schemas {
+		for _, enum := range schema.Enums {
+			enumMap[enum.Name] = true
+			// Also add lowercase version for case-insensitive lookup
+			enumMap[strings.ToLower(enum.Name)] = true
+		}
+	}
+
+	return enumMap
+}
+
+// tableUsesEnum checks if a table uses any enum types
+func (w *Writer) tableUsesEnum(table *models.Table, enumMap map[string]bool) bool {
+	for _, col := range table.Columns {
+		if enumMap[col.Type] || enumMap[strings.ToLower(col.Type)] {
+			return true
+		}
+	}
+	return false
+}
+
+// getTableEnumNames returns the list of enum variable names used by a table
+func (w *Writer) getTableEnumNames(table *models.Table, schema *models.Schema, enumMap map[string]bool) []string {
+	enumNames := make([]string, 0)
+	seen := make(map[string]bool)
+
+	for _, col := range table.Columns {
+		if enumMap[col.Type] || enumMap[strings.ToLower(col.Type)] {
+			// Find the enum in schema
+			for _, enum := range schema.Enums {
+				if strings.EqualFold(enum.Name, col.Type) {
+					varName := w.typeMapper.ToCamelCase(enum.Name)
+					if !seen[varName] {
+						enumNames = append(enumNames, varName)
+						seen[varName] = true
+					}
+					break
+				}
+			}
+		}
+	}
+
+	return enumNames
+}
+
+// getSortedColumnNames returns column names sorted by sequence or name
+func (w *Writer) getSortedColumnNames(table *models.Table) []string {
+	// Convert map to slice
+	columns := make([]*models.Column, 0, len(table.Columns))
+	for _, col := range table.Columns {
+		columns = append(columns, col)
+	}
+
+	// Sort by sequence, then by primary key, then by name
+	// (Similar to GORM writer)
+	sortColumns := func(i, j int) bool {
+		// Sort by sequence if both have it
+		if columns[i].Sequence > 0 && columns[j].Sequence > 0 {
+			return columns[i].Sequence < columns[j].Sequence
+		}
+
+		// Put primary keys first
+		if columns[i].IsPrimaryKey != columns[j].IsPrimaryKey {
+			return columns[i].IsPrimaryKey
+		}
+
+		// Otherwise sort alphabetically
+		return columns[i].Name < columns[j].Name
+	}
+
+	// Create a custom sorter
+	for i := 0; i < len(columns); i++ {
+		for j := i + 1; j < len(columns); j++ {
+			if !sortColumns(i, j) {
+				columns[i], columns[j] = columns[j], columns[i]
+			}
+		}
+	}
+
+	// Extract names
+	names := make([]string, len(columns))
+	for i, col := range columns {
+		names[i] = col.Name
+	}
+
+	return names
+}
+
+// getForeignKeyForColumn returns the foreign key constraint for a column, if any
+func (w *Writer) getForeignKeyForColumn(columnName string, table *models.Table) *models.Constraint {
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			for _, col := range constraint.Columns {
+				if col == columnName {
+					return constraint
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// writeOutput writes the content to file or stdout
+func (w *Writer) writeOutput(content string) error {
+	if w.options.OutputPath != "" {
+		return os.WriteFile(w.options.OutputPath, []byte(content), 0644)
+	}
+
+	// Print to stdout
+	fmt.Print(content)
+	return nil
+}
+
+// shouldUseMultiFile determines whether to use multi-file mode based on metadata or output path
+func (w *Writer) shouldUseMultiFile() bool {
+	// Check if multi_file is explicitly set in metadata
+	if w.options.Metadata != nil {
+		if mf, ok := w.options.Metadata["multi_file"].(bool); ok {
+			return mf
+		}
+	}
+
+	// Auto-detect based on output path
+	if w.options.OutputPath == "" {
+		// No output path means stdout (single file)
+		return false
+	}
+
+	// Check if path ends with .ts (explicit file)
+	if strings.HasSuffix(w.options.OutputPath, ".ts") {
+		return false
+	}
+
+	// Check if path ends with directory separator
+	if strings.HasSuffix(w.options.OutputPath, "/") || strings.HasSuffix(w.options.OutputPath, "\\") {
+		return true
+	}
+
+	// Check if path exists and is a directory
+	info, err := os.Stat(w.options.OutputPath)
+	if err == nil && info.IsDir() {
+		return true
+	}
+
+	// Default to single file for ambiguous cases
+	return false
+}

pkg/writers/gorm/README.md

@@ -0,0 +1,176 @@
+# GORM Writer
+
+Generates Go source files with GORM model definitions from database schema information.
+
+## Overview
+
+The GORM Writer converts RelSpec's internal database model representation into Go source code with GORM struct definitions, complete with proper tags, relationships, and methods.
+
+## Features
+
+- Generates GORM-compatible Go structs
+- Creates proper `gorm` struct tags
+- Generates `TableName()` methods
+- Adds relationship fields (belongs-to, has-many)
+- Supports both single-file and multi-file output
+- Auto-generates helper methods (optional)
+- Maps SQL types to Go types
+- Handles nullable fields with custom sql_types
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
+)
+
+func main() {
+    // Assume db is a *models.Database from a reader
+    options := &writers.WriterOptions{
+        OutputPath:  "models.go",
+        PackageName: "models",
+    }
+
+    writer := gorm.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate GORM models from PostgreSQL database (single file)
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output gorm \
+  --out-file models.go \
+  --package models
+
+# Generate GORM models with multi-file output (one file per table)
+relspec --input json \
+  --in-file schema.json \
+  --output gorm \
+  --out-file models/ \
+  --package models
+
+# Convert DBML to GORM models
+relspec --input dbml --in-file schema.dbml --output gorm --out-file models.go
+```
+
+## Output Modes
+
+### Single File Mode
+
+Generates all models in one file:
+
+```bash
+relspec --input pgsql --conn "..." --output gorm --out-file models.go
+```
+
+### Multi-File Mode
+
+Generates one file per table (auto-detected when output is a directory):
+
+```bash
+relspec --input pgsql --conn "..." --output gorm --out-file models/
+```
+
+Files are named: `sql_{schema}_{table}.go`
+
+## Generated Code Example
+
+```go
+package models
+
+import (
+    "time"
+    sql_types "git.warky.dev/wdevs/sql_types"
+)
+
+type ModelUser struct {
+    ID        int64                `gorm:"column:id;type:bigint;primaryKey;autoIncrement" json:"id"`
+    Username  string               `gorm:"column:username;type:varchar(50);not null;uniqueIndex" json:"username"`
+    Email     string               `gorm:"column:email;type:varchar(100);not null" json:"email"`
+    CreatedAt time.Time            `gorm:"column:created_at;type:timestamp;not null;default:now()" json:"created_at"`
+
+    // Relationships
+    Pos []*ModelPost `gorm:"foreignKey:UserID;references:ID;constraint:OnDelete:CASCADE" json:"pos,omitempty"`
+}
+
+func (ModelUser) TableName() string {
+    return "public.users"
+}
+
+type ModelPost struct {
+    ID        int64           `gorm:"column:id;type:bigint;primaryKey" json:"id"`
+    UserID    int64           `gorm:"column:user_id;type:bigint;not null" json:"user_id"`
+    Title     string          `gorm:"column:title;type:varchar(200);not null" json:"title"`
+    Content   sql_types.SqlString `gorm:"column:content;type:text" json:"content,omitempty"`
+
+    // Belongs to
+    Use *ModelUser `gorm:"foreignKey:UserID;references:ID" json:"use,omitempty"`
+}
+
+func (ModelPost) TableName() string {
+    return "public.posts"
+}
+```
+
+## Writer Options
+
+### Metadata Options
+
+Configure the writer behavior using metadata in `WriterOptions`:
+
+```go
+options := &writers.WriterOptions{
+    OutputPath:  "models.go",
+    PackageName: "models",
+    Metadata: map[string]interface{}{
+        "multi_file":      true,  // Enable multi-file mode
+        "populate_refs":   true,  // Populate RefDatabase/RefSchema
+        "generate_get_id_str": true, // Generate GetIDStr() methods
+    },
+}
+```
+
+## Type Mapping
+
+| SQL Type | Go Type | Notes |
+|----------|---------|-------|
+| bigint, int8 | int64 | - |
+| integer, int, int4 | int | - |
+| smallint, int2 | int16 | - |
+| varchar, text | string | Not nullable |
+| varchar, text (nullable) | sql_types.SqlString | Nullable |
+| boolean, bool | bool | - |
+| timestamp, timestamptz | time.Time | - |
+| numeric, decimal | float64 | - |
+| uuid | string | - |
+| json, jsonb | string | - |
+
+## Relationship Generation
+
+The writer automatically generates relationship fields:
+
+- **Belongs-to**: Generated for tables with foreign keys
+- **Has-many**: Generated for tables referenced by foreign keys
+- Relationship field names use 3-letter prefixes
+- Includes proper `gorm` tags with `foreignKey` and `references`
+
+## Notes
+
+- Model names are prefixed with "Model" (e.g., `ModelUser`)
+- Nullable columns use `sql_types.SqlString`, `sql_types.SqlInt64`, etc.
+- Generated code is auto-formatted with `go fmt`
+- JSON tags are automatically added
+- Supports schema-qualified table names in `TableName()` method

pkg/writers/gorm/writer.go

@@ -41,12 +41,7 @@ func NewWriter(options *writers.WriterOptions) *Writer {
 // WriteDatabase writes a complete database as GORM models
 func (w *Writer) WriteDatabase(db *models.Database) error {
 	// Check if multi-file mode is enabled
-	multiFile := false
+	multiFile := w.shouldUseMultiFile()
-	if w.options.Metadata != nil {
-		if mf, ok := w.options.Metadata["multi_file"].(bool); ok {
-			multiFile = mf
-		}
-	}
 
 	if multiFile {
 		return w.writeMultiFile(db)
@@ -340,6 +335,41 @@ func (w *Writer) writeOutput(content string) error {
 	return nil
 }
 
+// shouldUseMultiFile determines whether to use multi-file mode based on metadata or output path
+func (w *Writer) shouldUseMultiFile() bool {
+	// Check if multi_file is explicitly set in metadata
+	if w.options.Metadata != nil {
+		if mf, ok := w.options.Metadata["multi_file"].(bool); ok {
+			return mf
+		}
+	}
+
+	// Auto-detect based on output path
+	if w.options.OutputPath == "" {
+		// No output path means stdout (single file)
+		return false
+	}
+
+	// Check if path ends with .go (explicit file)
+	if strings.HasSuffix(w.options.OutputPath, ".go") {
+		return false
+	}
+
+	// Check if path ends with directory separator
+	if strings.HasSuffix(w.options.OutputPath, "/") || strings.HasSuffix(w.options.OutputPath, "\\") {
+		return true
+	}
+
+	// Check if path exists and is a directory
+	info, err := os.Stat(w.options.OutputPath)
+	if err == nil && info.IsDir() {
+		return true
+	}
+
+	// Default to single file for ambiguous cases
+	return false
+}
+
 // createDatabaseRef creates a shallow copy of database without schemas to avoid circular references
 func (w *Writer) createDatabaseRef(db *models.Database) *models.Database {
 	return &models.Database{

pkg/writers/graphql/README.md

@@ -0,0 +1,272 @@
+# GraphQL Schema Writer
+
+The GraphQL writer converts RelSpec's internal database model into GraphQL Schema Definition Language (SDL) files.
+
+## Features
+
+- **Table to Type mapping**: Database tables become GraphQL types
+- **Column to Field mapping**: Table columns become type fields
+- **Enum support**: Database enums are preserved
+- **Custom scalar declarations**: Automatically declares DateTime, JSON, Date scalars
+- **Implicit relationships**: Generates relationship fields from foreign keys
+- **Many-to-many support**: Handles junction tables intelligently
+- **Clean output**: Proper formatting, field ordering, and comments
+
+## Type Mappings
+
+### SQL to GraphQL
+
+| SQL Type | GraphQL Type | Notes |
+|----------|--------------|-------|
+| bigint, integer, serial (PK) | ID | Primary keys map to ID |
+| bigint, integer, int | Int | |
+| text, varchar, char | String | |
+| uuid (PK) | ID | UUID primary keys also map to ID |
+| uuid | String | Non-PK UUIDs map to String |
+| double precision, numeric, float | Float | |
+| boolean | Boolean | |
+| timestamp, timestamptz | DateTime | Custom scalar |
+| jsonb, json | JSON | Custom scalar |
+| date | Date | Custom scalar |
+| Enum types | Enum | Preserves enum name |
+| Arrays (e.g., text[]) | [Type] | Mapped to GraphQL lists |
+
+## Relationship Handling
+
+The writer intelligently generates relationship fields based on foreign key constraints:
+
+### Forward Relationships (FK on this table)
+```sql
+-- Post table has authorId FK to User.id
+CREATE TABLE post (
+  id bigint PRIMARY KEY,
+  title text NOT NULL,
+  author_id bigint NOT NULL REFERENCES user(id)
+);
+```
+
+```graphql
+type Post {
+  id: ID!
+  title: String!
+  author: User!  # Generated from authorId FK
+}
+```
+
+### Reverse Relationships (FK on other table)
+```graphql
+type User {
+  id: ID!
+  email: String!
+  posts: [Post!]!  # Reverse relationship (Post has FK to User)
+}
+```
+
+### Many-to-Many Relationships
+
+Junction tables (tables with only PKs and FKs) are automatically detected and hidden:
+
+```sql
+CREATE TABLE post_tag (
+  post_id bigint NOT NULL REFERENCES post(id),
+  tag_id bigint NOT NULL REFERENCES tag(id),
+  PRIMARY KEY (post_id, tag_id)
+);
+```
+
+```graphql
+type Post {
+  id: ID!
+  tags: [Tag!]!  # Many-to-many through PostTag junction table
+}
+
+type Tag {
+  id: ID!
+  posts: [Post!]!  # Reverse many-to-many
+}
+
+# Note: PostTag junction table is NOT included in output
+```
+
+## Usage
+
+### Basic Usage
+
+```go
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/graphql"
+)
+
+opts := &writers.WriterOptions{
+    OutputPath: "schema.graphql",
+}
+
+writer := graphql.NewWriter(opts)
+err := writer.WriteDatabase(db)
+```
+
+### With Metadata Options
+
+```go
+opts := &writers.WriterOptions{
+    OutputPath: "schema.graphql",
+    Metadata: map[string]any{
+        "includeScalarDeclarations": true,   // Include scalar declarations
+        "includeComments":            true,  // Include field/table comments
+    },
+}
+
+writer := graphql.NewWriter(opts)
+err := writer.WriteDatabase(db)
+```
+
+### Write to Stdout
+
+```go
+opts := &writers.WriterOptions{
+    OutputPath: "",  // Empty path writes to stdout
+}
+
+writer := graphql.NewWriter(opts)
+err := writer.WriteDatabase(db)
+```
+
+## CLI Usage
+
+```bash
+# Convert PostgreSQL database to GraphQL
+relspec convert --from pgsql \
+                --from-conn "postgres://user:pass@localhost:5432/mydb" \
+                --to graphql --to-path schema.graphql
+
+# Convert GORM models to GraphQL
+relspec convert --from gorm --from-path ./models \
+                --to graphql --to-path schema.graphql
+
+# Convert JSON to GraphQL
+relspec convert --from json --from-path schema.json \
+                --to graphql --to-path schema.graphql
+```
+
+## Output Format
+
+The generated GraphQL schema follows this structure:
+
+1. **Header comment** (if enabled)
+2. **Custom scalar declarations** (if any custom scalars are used)
+3. **Enum definitions** (alphabetically sorted)
+4. **Type definitions** (with fields ordered: ID first, then scalars alphabetically, then relationships)
+
+### Example Output
+
+```graphql
+# Generated GraphQL Schema
+# Database: myapp
+
+scalar DateTime
+scalar JSON
+scalar Date
+
+enum Role {
+  ADMIN
+  USER
+  MODERATOR
+}
+
+type User {
+  id: ID!
+  createdAt: DateTime!
+  email: String!
+  name: String!
+  role: Role!
+
+  posts: [Post!]!
+  profile: Profile
+}
+
+type Post {
+  id: ID!
+  content: String
+  published: Boolean!
+  publishedAt: Date
+  title: String!
+
+  author: User!
+  tags: [Tag!]!
+}
+
+type Tag {
+  id: ID!
+  name: String!
+
+  posts: [Post!]!
+}
+```
+
+## Metadata Options
+
+| Option | Type | Description | Default |
+|--------|------|-------------|---------|
+| `includeScalarDeclarations` | bool | Include `scalar DateTime`, etc. declarations | true |
+| `includeComments` | bool | Include table/field descriptions as comments | true |
+| `preservePKType` | bool | Use Int/String for PKs instead of ID | false |
+
+## Field Naming Conventions
+
+- **FK columns**: Foreign key columns like `authorId` are removed from the output; instead, a relationship field `author` is generated
+- **Relationship pluralization**: Reverse one-to-many relationships are pluralized (e.g., `posts`, `tags`)
+- **CamelCase**: Field names are kept in their original casing from the database
+
+## Junction Table Detection
+
+A table is considered a junction table if it:
+1. Has exactly 2 foreign key constraints
+2. All columns are either primary keys or foreign keys
+3. Has a composite primary key on the FK columns
+
+Junction tables are automatically hidden from the GraphQL output, and many-to-many relationship fields are generated on the related types instead.
+
+## Limitations
+
+- All tables in all schemas are flattened into a single GraphQL schema
+- No support for GraphQL-specific features like directives, interfaces, or unions
+- Nullable vs non-nullable is determined solely by the `NOT NULL` constraint
+
+## Example Conversion
+
+**Input** (Database Schema):
+```sql
+CREATE TABLE user (
+  id bigint PRIMARY KEY,
+  email text NOT NULL,
+  created_at timestamp NOT NULL
+);
+
+CREATE TABLE post (
+  id bigint PRIMARY KEY,
+  title text NOT NULL,
+  author_id bigint NOT NULL REFERENCES user(id)
+);
+```
+
+**Output** (GraphQL Schema):
+```graphql
+scalar DateTime
+
+type User {
+  id: ID!
+  createdAt: DateTime!
+  email: String!
+
+  posts: [Post!]!
+}
+
+type Post {
+  id: ID!
+  title: String!
+
+  author: User!
+}
+```

pkg/writers/graphql/relationships.go

@@ -0,0 +1,178 @@
+package graphql
+
+import (
+	"fmt"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+func (w *Writer) generateRelationFields(table *models.Table, db *models.Database, schema *models.Schema) []string {
+	var fields []string
+
+	// 1. Forward relationships (this table has FK)
+	for _, constraint := range table.Constraints {
+		if constraint.Type != models.ForeignKeyConstraint {
+			continue
+		}
+
+		// Find the related table
+		relatedTable := w.findTable(db, constraint.ReferencedSchema, constraint.ReferencedTable)
+		if relatedTable == nil {
+			continue
+		}
+
+		// Generate field name (remove "Id" suffix from FK column if present)
+		fieldName := w.relationFieldName(constraint.Columns[0])
+
+		// Determine nullability from FK column
+		nullable := true
+		for _, colName := range constraint.Columns {
+			if col, exists := table.Columns[colName]; exists {
+				if col.NotNull {
+					nullable = false
+					break
+				}
+			}
+		}
+
+		// Format: fieldName: RelatedType! or fieldName: RelatedType
+		gqlType := relatedTable.Name
+		if !nullable {
+			gqlType += "!"
+		}
+
+		fields = append(fields, fmt.Sprintf("  %s: %s", fieldName, gqlType))
+	}
+
+	// 2. Reverse relationships (other tables reference this table)
+	for _, otherSchema := range db.Schemas {
+		for _, otherTable := range otherSchema.Tables {
+			if otherTable.Name == table.Name && otherSchema.Name == schema.Name {
+				continue
+			}
+
+			// Skip join tables for many-to-many
+			if w.isJoinTable(otherTable) {
+				// Check if this is a many-to-many through this join table
+				if m2mField := w.getManyToManyField(table, otherTable, db); m2mField != "" {
+					fields = append(fields, m2mField)
+				}
+				continue
+			}
+
+			for _, constraint := range otherTable.Constraints {
+				if constraint.Type == models.ForeignKeyConstraint &&
+					constraint.ReferencedTable == table.Name &&
+					constraint.ReferencedSchema == schema.Name {
+					// Add reverse relationship field (array)
+					fieldName := w.pluralize(w.camelCase(otherTable.Name))
+					fields = append(fields, fmt.Sprintf("  %s: [%s!]!", fieldName, otherTable.Name))
+				}
+			}
+		}
+	}
+
+	return fields
+}
+
+func (w *Writer) getManyToManyField(table *models.Table, joinTable *models.Table, db *models.Database) string {
+	// Find the two FK constraints in the join table
+	var fk1, fk2 *models.Constraint
+	for _, constraint := range joinTable.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			if fk1 == nil {
+				fk1 = constraint
+			} else {
+				fk2 = constraint
+			}
+		}
+	}
+
+	if fk1 == nil || fk2 == nil {
+		return ""
+	}
+
+	// Determine which FK points to our table and which to the other table
+	var targetConstraint *models.Constraint
+	if fk1.ReferencedTable == table.Name {
+		targetConstraint = fk2
+	} else if fk2.ReferencedTable == table.Name {
+		targetConstraint = fk1
+	} else {
+		return "" // This join table doesn't involve our table
+	}
+
+	// Find the target table
+	targetTable := w.findTable(db, targetConstraint.ReferencedSchema, targetConstraint.ReferencedTable)
+	if targetTable == nil {
+		return ""
+	}
+
+	// Generate many-to-many field
+	fieldName := w.pluralize(w.camelCase(targetTable.Name))
+	return fmt.Sprintf("  %s: [%s!]!", fieldName, targetTable.Name)
+}
+
+func (w *Writer) findTable(db *models.Database, schemaName, tableName string) *models.Table {
+	for _, schema := range db.Schemas {
+		if schema.Name != schemaName {
+			continue
+		}
+		for _, table := range schema.Tables {
+			if table.Name == tableName {
+				return table
+			}
+		}
+	}
+	return nil
+}
+
+func (w *Writer) relationFieldName(fkColumnName string) string {
+	// Remove "Id" or "_id" suffix
+	name := fkColumnName
+	if strings.HasSuffix(name, "Id") {
+		name = name[:len(name)-2]
+	} else if strings.HasSuffix(name, "_id") {
+		name = name[:len(name)-3]
+	}
+
+	return w.camelCase(name)
+}
+
+func (w *Writer) camelCase(s string) string {
+	// If already camelCase or PascalCase, convert to camelCase
+	if s == "" {
+		return s
+	}
+
+	// Convert first character to lowercase
+	return strings.ToLower(string(s[0])) + s[1:]
+}
+
+func (w *Writer) pluralize(s string) string {
+	// Simple pluralization rules
+	if s == "" {
+		return s
+	}
+
+	// Already plural
+	if strings.HasSuffix(s, "s") {
+		return s
+	}
+
+	// Words ending in 'y' → 'ies'
+	if strings.HasSuffix(s, "y") {
+		return s[:len(s)-1] + "ies"
+	}
+
+	// Words ending in 's', 'x', 'z', 'ch', 'sh' → add 'es'
+	if strings.HasSuffix(s, "s") || strings.HasSuffix(s, "x") ||
+		strings.HasSuffix(s, "z") || strings.HasSuffix(s, "ch") ||
+		strings.HasSuffix(s, "sh") {
+		return s + "es"
+	}
+
+	// Default: add 's'
+	return s + "s"
+}

pkg/writers/graphql/type_mapping.go

@@ -0,0 +1,148 @@
+package graphql
+
+import (
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+func (w *Writer) sqlTypeToGraphQL(sqlType string, column *models.Column, table *models.Table, schema *models.Schema) string {
+	// Check if this is a primary key → ID type
+	if column.IsPrimaryKey {
+		// Check metadata for explicit type preference
+		if w.options.Metadata != nil {
+			if preserveType, ok := w.options.Metadata["preservePKType"].(bool); ok && preserveType {
+				// Use Int or String based on SQL type
+				if w.isIntegerType(sqlType) {
+					return "Int"
+				}
+				return "String"
+			}
+		}
+		return "ID"
+	}
+
+	// Map SQL types to custom scalars
+	if scalar := w.sqlTypeToCustomScalar(sqlType); scalar != "" {
+		return scalar
+	}
+
+	// Check if it's an enum
+	if w.isEnumType(sqlType, schema) {
+		return sqlType
+	}
+
+	// Standard type mappings
+	baseType := strings.Split(sqlType, "(")[0] // Remove length/precision
+	baseType = strings.TrimSpace(baseType)
+
+	// Handle array types
+	if strings.HasSuffix(baseType, "[]") {
+		elemType := strings.TrimSuffix(baseType, "[]")
+		gqlType := w.mapBaseTypeToGraphQL(elemType)
+		return "[" + gqlType + "]"
+	}
+
+	return w.mapBaseTypeToGraphQL(baseType)
+}
+
+func (w *Writer) mapBaseTypeToGraphQL(baseType string) string {
+	typeMap := map[string]string{
+		// Text types
+		"text":      "String",
+		"varchar":   "String",
+		"char":      "String",
+		"character": "String",
+		"bpchar":    "String",
+		"name":      "String",
+
+		// UUID
+		"uuid": "ID",
+
+		// Integer types
+		"integer":     "Int",
+		"int":         "Int",
+		"int2":        "Int",
+		"int4":        "Int",
+		"int8":        "Int",
+		"bigint":      "Int",
+		"smallint":    "Int",
+		"serial":      "Int",
+		"bigserial":   "Int",
+		"smallserial": "Int",
+
+		// Float types
+		"double precision": "Float",
+		"float":            "Float",
+		"float4":           "Float",
+		"float8":           "Float",
+		"real":             "Float",
+		"numeric":          "Float",
+		"decimal":          "Float",
+		"money":            "Float",
+
+		// Boolean
+		"boolean": "Boolean",
+		"bool":    "Boolean",
+	}
+
+	if gqlType, ok := typeMap[baseType]; ok {
+		return gqlType
+	}
+
+	// Default: capitalize first letter
+	if len(baseType) > 0 {
+		return strings.ToUpper(string(baseType[0])) + baseType[1:]
+	}
+
+	return "String"
+}
+
+func (w *Writer) sqlTypeToCustomScalar(sqlType string) string {
+	scalarMap := map[string]string{
+		"timestamp":                "DateTime",
+		"timestamptz":              "DateTime",
+		"timestamp with time zone": "DateTime",
+		"jsonb":                    "JSON",
+		"json":                     "JSON",
+		"date":                     "Date",
+	}
+
+	baseType := strings.Split(sqlType, "(")[0]
+	baseType = strings.TrimSpace(baseType)
+
+	if scalar, ok := scalarMap[baseType]; ok {
+		return scalar
+	}
+
+	return ""
+}
+
+func (w *Writer) isIntegerType(sqlType string) bool {
+	intTypes := map[string]bool{
+		"integer":     true,
+		"int":         true,
+		"int2":        true,
+		"int4":        true,
+		"int8":        true,
+		"bigint":      true,
+		"smallint":    true,
+		"serial":      true,
+		"bigserial":   true,
+		"smallserial": true,
+	}
+
+	baseType := strings.Split(sqlType, "(")[0]
+	baseType = strings.TrimSpace(baseType)
+
+	return intTypes[baseType]
+}
+
+func (w *Writer) isEnumType(sqlType string, schema *models.Schema) bool {
+	for _, enum := range schema.Enums {
+		if enum.Name == sqlType {
+			return true
+		}
+	}
+	return false
+}

pkg/writers/graphql/writer.go

@@ -0,0 +1,272 @@
+package graphql
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+type Writer struct {
+	options *writers.WriterOptions
+}
+
+func NewWriter(options *writers.WriterOptions) *Writer {
+	return &Writer{
+		options: options,
+	}
+}
+
+func (w *Writer) WriteDatabase(db *models.Database) error {
+	content := w.databaseToGraphQL(db)
+
+	if w.options.OutputPath != "" {
+		return os.WriteFile(w.options.OutputPath, []byte(content), 0644)
+	}
+
+	fmt.Print(content)
+	return nil
+}
+
+func (w *Writer) WriteSchema(schema *models.Schema) error {
+	db := models.InitDatabase(schema.Name)
+	db.Schemas = []*models.Schema{schema}
+	return w.WriteDatabase(db)
+}
+
+func (w *Writer) WriteTable(table *models.Table) error {
+	schema := models.InitSchema(table.Schema)
+	schema.Tables = []*models.Table{table}
+	db := models.InitDatabase(schema.Name)
+	db.Schemas = []*models.Schema{schema}
+	return w.WriteDatabase(db)
+}
+
+func (w *Writer) databaseToGraphQL(db *models.Database) string {
+	var sb strings.Builder
+
+	// Header comment
+	if w.shouldIncludeComments() {
+		sb.WriteString("# Generated GraphQL Schema\n")
+		if db.Name != "" {
+			sb.WriteString(fmt.Sprintf("# Database: %s\n", db.Name))
+		}
+		sb.WriteString("\n")
+	}
+
+	// Custom scalar declarations
+	if w.shouldIncludeScalarDeclarations() {
+		scalars := w.collectCustomScalars(db)
+		if len(scalars) > 0 {
+			for _, scalar := range scalars {
+				sb.WriteString(fmt.Sprintf("scalar %s\n", scalar))
+			}
+			sb.WriteString("\n")
+		}
+	}
+
+	// Enum definitions
+	for _, schema := range db.Schemas {
+		for _, enum := range schema.Enums {
+			sb.WriteString(w.enumToGraphQL(enum))
+			sb.WriteString("\n")
+		}
+	}
+
+	// Type definitions
+	for _, schema := range db.Schemas {
+		for _, table := range schema.Tables {
+			// Skip join tables (tables with only PK+FK columns)
+			if w.isJoinTable(table) {
+				continue
+			}
+
+			sb.WriteString(w.tableToGraphQL(table, db, schema))
+			sb.WriteString("\n")
+		}
+	}
+
+	return sb.String()
+}
+
+func (w *Writer) shouldIncludeComments() bool {
+	if w.options.Metadata != nil {
+		if include, ok := w.options.Metadata["includeComments"].(bool); ok {
+			return include
+		}
+	}
+	return true // Default to true
+}
+
+func (w *Writer) shouldIncludeScalarDeclarations() bool {
+	if w.options.Metadata != nil {
+		if include, ok := w.options.Metadata["includeScalarDeclarations"].(bool); ok {
+			return include
+		}
+	}
+	return true // Default to true
+}
+
+func (w *Writer) collectCustomScalars(db *models.Database) []string {
+	scalarsNeeded := make(map[string]bool)
+
+	for _, schema := range db.Schemas {
+		for _, table := range schema.Tables {
+			for _, col := range table.Columns {
+				if scalar := w.sqlTypeToCustomScalar(col.Type); scalar != "" {
+					scalarsNeeded[scalar] = true
+				}
+			}
+		}
+	}
+
+	// Convert to sorted slice
+	scalars := make([]string, 0, len(scalarsNeeded))
+	for scalar := range scalarsNeeded {
+		scalars = append(scalars, scalar)
+	}
+	sort.Strings(scalars)
+
+	return scalars
+}
+
+func (w *Writer) isJoinTable(table *models.Table) bool {
+	// A join table typically has:
+	// 1. Exactly 2 FK constraints
+	// 2. Composite primary key on those FK columns
+	// 3. No other columns
+
+	fkCount := 0
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			fkCount++
+		}
+	}
+
+	if fkCount != 2 {
+		return false
+	}
+
+	// Check if all columns are either PKs or FKs
+	for _, col := range table.Columns {
+		isFKColumn := false
+		for _, constraint := range table.Constraints {
+			if constraint.Type == models.ForeignKeyConstraint {
+				for _, fkCol := range constraint.Columns {
+					if fkCol == col.Name {
+						isFKColumn = true
+						break
+					}
+				}
+			}
+		}
+
+		if !isFKColumn && !col.IsPrimaryKey {
+			// Found a column that's neither PK nor FK
+			return false
+		}
+	}
+
+	return true
+}
+
+func (w *Writer) enumToGraphQL(enum *models.Enum) string {
+	var sb strings.Builder
+
+	sb.WriteString(fmt.Sprintf("enum %s {\n", enum.Name))
+	for _, value := range enum.Values {
+		sb.WriteString(fmt.Sprintf("  %s\n", value))
+	}
+	sb.WriteString("}\n")
+
+	return sb.String()
+}
+
+func (w *Writer) tableToGraphQL(table *models.Table, db *models.Database, schema *models.Schema) string {
+	var sb strings.Builder
+
+	// Type name
+	typeName := table.Name
+
+	// Description comment
+	if w.shouldIncludeComments() && (table.Description != "" || table.Comment != "") {
+		desc := table.Description
+		if desc == "" {
+			desc = table.Comment
+		}
+		sb.WriteString(fmt.Sprintf("# %s\n", desc))
+	}
+
+	sb.WriteString(fmt.Sprintf("type %s {\n", typeName))
+
+	// Collect and categorize fields
+	var idFields, scalarFields, relationFields []string
+
+	for _, column := range table.Columns {
+		// Skip FK columns (they become relation fields)
+		if w.isForeignKeyColumn(column, table) {
+			continue
+		}
+
+		gqlType := w.sqlTypeToGraphQL(column.Type, column, table, schema)
+		if gqlType == "" {
+			continue // Skip if type couldn't be mapped
+		}
+
+		// Determine nullability
+		if column.NotNull {
+			gqlType += "!"
+		}
+
+		field := fmt.Sprintf("  %s: %s", column.Name, gqlType)
+
+		if column.IsPrimaryKey {
+			idFields = append(idFields, field)
+		} else {
+			scalarFields = append(scalarFields, field)
+		}
+	}
+
+	// Add relation fields
+	relationFields = w.generateRelationFields(table, db, schema)
+
+	// Write fields in order: ID, scalars (sorted), relations (sorted)
+	for _, field := range idFields {
+		sb.WriteString(field + "\n")
+	}
+
+	sort.Strings(scalarFields)
+	for _, field := range scalarFields {
+		sb.WriteString(field + "\n")
+	}
+
+	if len(relationFields) > 0 {
+		if len(scalarFields) > 0 || len(idFields) > 0 {
+			sb.WriteString("\n") // Blank line before relations
+		}
+		sort.Strings(relationFields)
+		for _, field := range relationFields {
+			sb.WriteString(field + "\n")
+		}
+	}
+
+	sb.WriteString("}\n")
+
+	return sb.String()
+}
+
+func (w *Writer) isForeignKeyColumn(column *models.Column, table *models.Table) bool {
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			for _, fkCol := range constraint.Columns {
+				if fkCol == column.Name {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}

pkg/writers/graphql/writer_test.go

@@ -0,0 +1,412 @@
+package graphql
+
+import (
+	"strings"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+func TestWriter_WriteTable_Simple(t *testing.T) {
+	table := models.InitTable("User", "public")
+
+	idCol := models.InitColumn("id", "User", "public")
+	idCol.Type = "bigint"
+	idCol.IsPrimaryKey = true
+	idCol.NotNull = true
+	table.Columns["id"] = idCol
+
+	nameCol := models.InitColumn("name", "User", "public")
+	nameCol.Type = "text"
+	nameCol.NotNull = true
+	table.Columns["name"] = nameCol
+
+	emailCol := models.InitColumn("email", "User", "public")
+	emailCol.Type = "text"
+	emailCol.NotNull = false
+	table.Columns["email"] = emailCol
+
+	opts := &writers.WriterOptions{
+		OutputPath: "",
+	}
+
+	writer := NewWriter(opts)
+	schema := models.InitSchema("public")
+	schema.Tables = []*models.Table{table}
+	db := models.InitDatabase("test")
+	db.Schemas = []*models.Schema{schema}
+
+	output := writer.databaseToGraphQL(db)
+
+	// Verify output contains type definition
+	if !strings.Contains(output, "type User {") {
+		t.Error("Expected 'type User {' in output")
+	}
+
+	// Verify fields
+	if !strings.Contains(output, "id: ID!") {
+		t.Error("Expected 'id: ID!' in output")
+	}
+
+	if !strings.Contains(output, "name: String!") {
+		t.Error("Expected 'name: String!' in output")
+	}
+
+	if !strings.Contains(output, "email: String") {
+		t.Error("Expected 'email: String' in output")
+	}
+
+	// Ensure email is not followed by ! (nullable)
+	if strings.Contains(output, "email: String!") {
+		t.Error("Did not expect 'email: String!' (should be nullable)")
+	}
+}
+
+func TestWriter_WriteDatabase_WithEnum(t *testing.T) {
+	schema := models.InitSchema("public")
+
+	// Create enum
+	roleEnum := &models.Enum{
+		Name:   "Role",
+		Schema: "public",
+		Values: []string{"ADMIN", "USER", "GUEST"},
+	}
+	schema.Enums = []*models.Enum{roleEnum}
+
+	// Create table with enum field
+	table := models.InitTable("User", "public")
+
+	idCol := models.InitColumn("id", "User", "public")
+	idCol.Type = "bigint"
+	idCol.IsPrimaryKey = true
+	idCol.NotNull = true
+	table.Columns["id"] = idCol
+
+	roleCol := models.InitColumn("role", "User", "public")
+	roleCol.Type = "Role"
+	roleCol.NotNull = true
+	table.Columns["role"] = roleCol
+
+	schema.Tables = []*models.Table{table}
+
+	db := models.InitDatabase("test")
+	db.Schemas = []*models.Schema{schema}
+
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+
+	output := writer.databaseToGraphQL(db)
+
+	// Verify enum definition
+	if !strings.Contains(output, "enum Role {") {
+		t.Error("Expected 'enum Role {' in output")
+	}
+
+	if !strings.Contains(output, "ADMIN") {
+		t.Error("Expected 'ADMIN' enum value in output")
+	}
+
+	// Verify enum usage in type
+	if !strings.Contains(output, "role: Role!") {
+		t.Error("Expected 'role: Role!' in output")
+	}
+}
+
+func TestWriter_WriteDatabase_WithRelations(t *testing.T) {
+	schema := models.InitSchema("public")
+
+	// Create User table
+	userTable := models.InitTable("User", "public")
+	userIdCol := models.InitColumn("id", "User", "public")
+	userIdCol.Type = "bigint"
+	userIdCol.IsPrimaryKey = true
+	userIdCol.NotNull = true
+	userTable.Columns["id"] = userIdCol
+
+	userNameCol := models.InitColumn("name", "User", "public")
+	userNameCol.Type = "text"
+	userNameCol.NotNull = true
+	userTable.Columns["name"] = userNameCol
+
+	// Create Post table with FK to User
+	postTable := models.InitTable("Post", "public")
+
+	postIdCol := models.InitColumn("id", "Post", "public")
+	postIdCol.Type = "bigint"
+	postIdCol.IsPrimaryKey = true
+	postIdCol.NotNull = true
+	postTable.Columns["id"] = postIdCol
+
+	titleCol := models.InitColumn("title", "Post", "public")
+	titleCol.Type = "text"
+	titleCol.NotNull = true
+	postTable.Columns["title"] = titleCol
+
+	authorIdCol := models.InitColumn("authorId", "Post", "public")
+	authorIdCol.Type = "bigint"
+	authorIdCol.NotNull = true
+	postTable.Columns["authorId"] = authorIdCol
+
+	// Add FK constraint
+	fkConstraint := models.InitConstraint("fk_post_author", models.ForeignKeyConstraint)
+	fkConstraint.Schema = "public"
+	fkConstraint.Table = "Post"
+	fkConstraint.Columns = []string{"authorId"}
+	fkConstraint.ReferencedSchema = "public"
+	fkConstraint.ReferencedTable = "User"
+	fkConstraint.ReferencedColumns = []string{"id"}
+	postTable.Constraints["fk_post_author"] = fkConstraint
+
+	schema.Tables = []*models.Table{userTable, postTable}
+
+	db := models.InitDatabase("test")
+	db.Schemas = []*models.Schema{schema}
+
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+
+	output := writer.databaseToGraphQL(db)
+
+	// Verify Post has author field (forward relationship)
+	if !strings.Contains(output, "author: User!") {
+		t.Error("Expected 'author: User!' in Post type")
+	}
+
+	// Verify authorId FK column is NOT in the output
+	if strings.Contains(output, "authorId:") {
+		t.Error("Did not expect 'authorId:' field in output (FK columns should be hidden)")
+	}
+
+	// Verify User has posts field (reverse relationship)
+	if !strings.Contains(output, "posts: [Post!]!") {
+		t.Error("Expected 'posts: [Post!]!' in User type")
+	}
+}
+
+func TestWriter_WriteDatabase_CustomScalars(t *testing.T) {
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("Event", "public")
+
+	idCol := models.InitColumn("id", "Event", "public")
+	idCol.Type = "bigint"
+	idCol.IsPrimaryKey = true
+	idCol.NotNull = true
+	table.Columns["id"] = idCol
+
+	createdAtCol := models.InitColumn("createdAt", "Event", "public")
+	createdAtCol.Type = "timestamp"
+	createdAtCol.NotNull = true
+	table.Columns["createdAt"] = createdAtCol
+
+	metadataCol := models.InitColumn("metadata", "Event", "public")
+	metadataCol.Type = "jsonb"
+	metadataCol.NotNull = false
+	table.Columns["metadata"] = metadataCol
+
+	dateCol := models.InitColumn("eventDate", "Event", "public")
+	dateCol.Type = "date"
+	dateCol.NotNull = false
+	table.Columns["eventDate"] = dateCol
+
+	schema.Tables = []*models.Table{table}
+
+	db := models.InitDatabase("test")
+	db.Schemas = []*models.Schema{schema}
+
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+
+	output := writer.databaseToGraphQL(db)
+
+	// Verify scalar declarations
+	if !strings.Contains(output, "scalar DateTime") {
+		t.Error("Expected 'scalar DateTime' declaration")
+	}
+
+	if !strings.Contains(output, "scalar JSON") {
+		t.Error("Expected 'scalar JSON' declaration")
+	}
+
+	if !strings.Contains(output, "scalar Date") {
+		t.Error("Expected 'scalar Date' declaration")
+	}
+
+	// Verify field types
+	if !strings.Contains(output, "createdAt: DateTime!") {
+		t.Error("Expected 'createdAt: DateTime!' in output")
+	}
+
+	if !strings.Contains(output, "metadata: JSON") {
+		t.Error("Expected 'metadata: JSON' in output")
+	}
+
+	if !strings.Contains(output, "eventDate: Date") {
+		t.Error("Expected 'eventDate: Date' in output")
+	}
+}
+
+func TestWriter_WriteDatabase_ManyToMany(t *testing.T) {
+	schema := models.InitSchema("public")
+
+	// Create Post table
+	postTable := models.InitTable("Post", "public")
+	postIdCol := models.InitColumn("id", "Post", "public")
+	postIdCol.Type = "bigint"
+	postIdCol.IsPrimaryKey = true
+	postIdCol.NotNull = true
+	postTable.Columns["id"] = postIdCol
+
+	titleCol := models.InitColumn("title", "Post", "public")
+	titleCol.Type = "text"
+	titleCol.NotNull = true
+	postTable.Columns["title"] = titleCol
+
+	// Create Tag table
+	tagTable := models.InitTable("Tag", "public")
+	tagIdCol := models.InitColumn("id", "Tag", "public")
+	tagIdCol.Type = "bigint"
+	tagIdCol.IsPrimaryKey = true
+	tagIdCol.NotNull = true
+	tagTable.Columns["id"] = tagIdCol
+
+	nameCol := models.InitColumn("name", "Tag", "public")
+	nameCol.Type = "text"
+	nameCol.NotNull = true
+	tagTable.Columns["name"] = nameCol
+
+	// Create PostTag join table
+	joinTable := models.InitTable("PostTag", "public")
+
+	postIdJoinCol := models.InitColumn("postId", "PostTag", "public")
+	postIdJoinCol.Type = "bigint"
+	postIdJoinCol.NotNull = true
+	postIdJoinCol.IsPrimaryKey = true
+	joinTable.Columns["postId"] = postIdJoinCol
+
+	tagIdJoinCol := models.InitColumn("tagId", "PostTag", "public")
+	tagIdJoinCol.Type = "bigint"
+	tagIdJoinCol.NotNull = true
+	tagIdJoinCol.IsPrimaryKey = true
+	joinTable.Columns["tagId"] = tagIdJoinCol
+
+	// Add composite PK constraint
+	pkConstraint := models.InitConstraint("pk_posttag", models.PrimaryKeyConstraint)
+	pkConstraint.Schema = "public"
+	pkConstraint.Table = "PostTag"
+	pkConstraint.Columns = []string{"postId", "tagId"}
+	joinTable.Constraints["pk_posttag"] = pkConstraint
+
+	// Add FK to Post
+	fk1 := models.InitConstraint("fk_posttag_post", models.ForeignKeyConstraint)
+	fk1.Schema = "public"
+	fk1.Table = "PostTag"
+	fk1.Columns = []string{"postId"}
+	fk1.ReferencedSchema = "public"
+	fk1.ReferencedTable = "Post"
+	fk1.ReferencedColumns = []string{"id"}
+	joinTable.Constraints["fk_posttag_post"] = fk1
+
+	// Add FK to Tag
+	fk2 := models.InitConstraint("fk_posttag_tag", models.ForeignKeyConstraint)
+	fk2.Schema = "public"
+	fk2.Table = "PostTag"
+	fk2.Columns = []string{"tagId"}
+	fk2.ReferencedSchema = "public"
+	fk2.ReferencedTable = "Tag"
+	fk2.ReferencedColumns = []string{"id"}
+	joinTable.Constraints["fk_posttag_tag"] = fk2
+
+	schema.Tables = []*models.Table{postTable, tagTable, joinTable}
+
+	db := models.InitDatabase("test")
+	db.Schemas = []*models.Schema{schema}
+
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+
+	output := writer.databaseToGraphQL(db)
+
+	// Verify join table is NOT in output
+	if strings.Contains(output, "type PostTag") {
+		t.Error("Did not expect 'type PostTag' (join tables should be hidden)")
+	}
+
+	// Verify Post has tags field
+	if !strings.Contains(output, "tags: [Tag!]!") {
+		t.Error("Expected 'tags: [Tag!]!' in Post type")
+	}
+
+	// Verify Tag has posts field
+	if !strings.Contains(output, "posts: [Post!]!") {
+		t.Error("Expected 'posts: [Post!]!' in Tag type")
+	}
+}
+
+func TestWriter_WriteDatabase_UUIDType(t *testing.T) {
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("User", "public")
+
+	idCol := models.InitColumn("id", "User", "public")
+	idCol.Type = "uuid"
+	idCol.IsPrimaryKey = true
+	idCol.NotNull = true
+	table.Columns["id"] = idCol
+
+	schema.Tables = []*models.Table{table}
+
+	db := models.InitDatabase("test")
+	db.Schemas = []*models.Schema{schema}
+
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+
+	output := writer.databaseToGraphQL(db)
+
+	// UUID primary keys should still map to ID
+	if !strings.Contains(output, "id: ID!") {
+		t.Error("Expected 'id: ID!' for UUID primary key")
+	}
+}
+
+func TestWriter_Metadata_NoScalarDeclarations(t *testing.T) {
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("Event", "public")
+
+	idCol := models.InitColumn("id", "Event", "public")
+	idCol.Type = "bigint"
+	idCol.IsPrimaryKey = true
+	table.Columns["id"] = idCol
+
+	createdAtCol := models.InitColumn("createdAt", "Event", "public")
+	createdAtCol.Type = "timestamp"
+	createdAtCol.NotNull = true
+	table.Columns["createdAt"] = createdAtCol
+
+	schema.Tables = []*models.Table{table}
+
+	db := models.InitDatabase("test")
+	db.Schemas = []*models.Schema{schema}
+
+	opts := &writers.WriterOptions{
+		Metadata: map[string]any{
+			"includeScalarDeclarations": false,
+		},
+	}
+	writer := NewWriter(opts)
+
+	output := writer.databaseToGraphQL(db)
+
+	// Verify no scalar declarations
+	if strings.Contains(output, "scalar DateTime") {
+		t.Error("Did not expect 'scalar DateTime' with includeScalarDeclarations=false")
+	}
+
+	// But field should still use DateTime
+	if !strings.Contains(output, "createdAt: DateTime!") {
+		t.Error("Expected 'createdAt: DateTime!' in output")
+	}
+}

pkg/writers/json/README.md

@@ -0,0 +1,277 @@
+# JSON Writer
+
+Generates database schema definitions in JSON format.
+
+## Overview
+
+The JSON Writer converts RelSpec's internal database model representation into JSON format, providing a complete, structured representation of the database schema.
+
+## Features
+
+- Generates RelSpec's canonical JSON schema format
+- Complete schema representation including:
+  - Databases and schemas
+  - Tables, columns, and data types
+  - Constraints (PK, FK, unique, check)
+  - Indexes
+  - Relationships
+  - Views and sequences
+- Pretty-printed, human-readable output
+- Suitable for version control
+- Ideal interchange format
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/json"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "schema.json",
+    }
+
+    writer := json.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Export PostgreSQL database to JSON
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output json \
+  --out-file schema.json
+
+# Convert GORM models to JSON
+relspec --input gorm --in-file models.go --output json --out-file schema.json
+
+# Convert DBML to JSON
+relspec --input dbml --in-file diagram.dbml --output json --out-file schema.json
+```
+
+## Generated JSON Example
+
+```json
+{
+  "name": "myapp",
+  "description": "",
+  "database_type": "postgresql",
+  "database_version": "",
+  "source_format": "pgsql",
+  "schemas": [
+    {
+      "name": "public",
+      "description": "",
+      "tables": [
+        {
+          "name": "users",
+          "schema": "public",
+          "description": "",
+          "columns": {
+            "id": {
+              "name": "id",
+              "table": "users",
+              "schema": "public",
+              "type": "bigint",
+              "length": 0,
+              "precision": 0,
+              "scale": 0,
+              "not_null": true,
+              "is_primary_key": true,
+              "auto_increment": true,
+              "default": "",
+              "sequence": 1
+            },
+            "username": {
+              "name": "username",
+              "table": "users",
+              "schema": "public",
+              "type": "varchar",
+              "length": 50,
+              "not_null": true,
+              "is_primary_key": false,
+              "auto_increment": false,
+              "sequence": 2
+            },
+            "email": {
+              "name": "email",
+              "table": "users",
+              "schema": "public",
+              "type": "varchar",
+              "length": 100,
+              "not_null": true,
+              "sequence": 3
+            }
+          },
+          "constraints": {
+            "pk_users": {
+              "name": "pk_users",
+              "type": "PRIMARY KEY",
+              "table": "users",
+              "schema": "public",
+              "columns": ["id"]
+            },
+            "uq_users_username": {
+              "name": "uq_users_username",
+              "type": "UNIQUE",
+              "table": "users",
+              "schema": "public",
+              "columns": ["username"]
+            }
+          },
+          "indexes": {
+            "idx_users_email": {
+              "name": "idx_users_email",
+              "table": "users",
+              "schema": "public",
+              "columns": ["email"],
+              "unique": false,
+              "type": "btree"
+            }
+          },
+          "relationships": {}
+        },
+        {
+          "name": "posts",
+          "schema": "public",
+          "columns": {
+            "id": {
+              "name": "id",
+              "type": "bigint",
+              "not_null": true,
+              "is_primary_key": true,
+              "sequence": 1
+            },
+            "user_id": {
+              "name": "user_id",
+              "type": "bigint",
+              "not_null": true,
+              "sequence": 2
+            },
+            "title": {
+              "name": "title",
+              "type": "varchar",
+              "length": 200,
+              "not_null": true,
+              "sequence": 3
+            },
+            "content": {
+              "name": "content",
+              "type": "text",
+              "not_null": false,
+              "sequence": 4
+            }
+          },
+          "constraints": {
+            "fk_posts_user_id": {
+              "name": "fk_posts_user_id",
+              "type": "FOREIGN KEY",
+              "table": "posts",
+              "schema": "public",
+              "columns": ["user_id"],
+              "referenced_table": "users",
+              "referenced_schema": "public",
+              "referenced_columns": ["id"],
+              "on_delete": "CASCADE",
+              "on_update": "NO ACTION"
+            }
+          },
+          "indexes": {
+            "idx_posts_user_id": {
+              "name": "idx_posts_user_id",
+              "columns": ["user_id"],
+              "unique": false,
+              "type": "btree"
+            }
+          }
+        }
+      ],
+      "views": [],
+      "sequences": []
+    }
+  ]
+}
+```
+
+## Schema Structure
+
+The JSON format includes:
+
+### Database Level
+- `name` - Database name
+- `description` - Database description
+- `database_type` - Database system type
+- `database_version` - Version information
+- `source_format` - Original source format
+- `schemas` - Array of schema objects
+
+### Schema Level
+- `name` - Schema name
+- `description` - Schema description
+- `tables` - Array of table objects
+- `views` - Array of view objects
+- `sequences` - Array of sequence objects
+
+### Table Level
+- `name` - Table name
+- `schema` - Schema name
+- `description` - Table description
+- `columns` - Map of column objects
+- `constraints` - Map of constraint objects
+- `indexes` - Map of index objects
+- `relationships` - Map of relationship objects
+
+### Column Level
+- `name` - Column name
+- `type` - Data type
+- `length` - Type length
+- `precision`, `scale` - Numeric precision
+- `not_null` - NOT NULL flag
+- `is_primary_key` - Primary key flag
+- `auto_increment` - Auto-increment flag
+- `default` - Default value
+- `sequence` - Column order
+
+### Constraint Level
+- `name` - Constraint name
+- `type` - Constraint type (PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK)
+- `columns` - Constrained columns
+- `referenced_table`, `referenced_schema` - FK references
+- `referenced_columns` - Referenced columns
+- `on_delete`, `on_update` - FK actions
+
+### Index Level
+- `name` - Index name
+- `columns` - Indexed columns
+- `unique` - Unique flag
+- `type` - Index type
+
+## Use Cases
+
+- **Version Control** - Track schema changes in git
+- **Documentation** - Human-readable schema documentation
+- **Interchange** - Standard format for tool integration
+- **Backup** - Schema backup without database access
+- **Testing** - Test data for schema validation
+- **API** - Schema information for APIs
+
+## Notes
+
+- Output is pretty-printed with 2-space indentation
+- Preserves all schema metadata
+- Can be round-tripped (read and write) without loss
+- Schema-agnostic format
+- Ideal for automation and tooling

pkg/writers/pgsql/README.md

@@ -0,0 +1,195 @@
+# PostgreSQL Writer
+
+Generates PostgreSQL DDL (Data Definition Language) SQL scripts from database schema information.
+
+## Overview
+
+The PostgreSQL Writer converts RelSpec's internal database model representation into PostgreSQL-compatible SQL DDL scripts, including CREATE TABLE statements, constraints, indexes, views, and sequences.
+
+## Features
+
+- Generates complete PostgreSQL DDL
+- Creates schemas, tables, columns
+- Defines constraints (PK, FK, unique, check)
+- Creates indexes
+- Generates views and sequences
+- Supports migration scripts
+- Includes audit triggers (optional)
+- Handles PostgreSQL-specific data types
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/pgsql"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "schema.sql",
+    }
+
+    writer := pgsql.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate PostgreSQL DDL from JSON schema
+relspec --input json \
+  --in-file schema.json \
+  --output pgsql \
+  --out-file schema.sql
+
+# Convert GORM models to PostgreSQL DDL
+relspec --input gorm \
+  --in-file models.go \
+  --output pgsql \
+  --out-file create_tables.sql
+
+# Export live database schema to SQL
+relspec --input pgsql \
+  --conn "postgres://localhost/source_db" \
+  --output pgsql \
+  --out-file backup_schema.sql
+```
+
+## Generated SQL Example
+
+```sql
+-- Schema: public
+
+CREATE SCHEMA IF NOT EXISTS public;
+
+-- Table: public.users
+
+CREATE TABLE IF NOT EXISTS public.users (
+    id BIGSERIAL PRIMARY KEY,
+    username VARCHAR(50) NOT NULL,
+    email VARCHAR(100) NOT NULL,
+    bio TEXT,
+    created_at TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+-- Constraints for public.users
+
+ALTER TABLE public.users
+    ADD CONSTRAINT uq_users_username UNIQUE (username);
+
+-- Indexes for public.users
+
+CREATE INDEX idx_users_email ON public.users (email);
+
+-- Table: public.posts
+
+CREATE TABLE IF NOT EXISTS public.posts (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL,
+    title VARCHAR(200) NOT NULL,
+    content TEXT,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+-- Foreign Keys for public.posts
+
+ALTER TABLE public.posts
+    ADD CONSTRAINT fk_posts_user_id
+    FOREIGN KEY (user_id)
+    REFERENCES public.users (id)
+    ON DELETE CASCADE
+    ON UPDATE NO ACTION;
+
+-- Indexes for public.posts
+
+CREATE INDEX idx_posts_user_id ON public.posts (user_id);
+```
+
+## Writer Options
+
+### Metadata Options
+
+```go
+options := &writers.WriterOptions{
+    OutputPath: "schema.sql",
+    Metadata: map[string]interface{}{
+        "include_drop":    true,  // Include DROP statements
+        "include_audit":   true,  // Include audit triggers
+        "if_not_exists":   true,  // Use IF NOT EXISTS
+        "migration_mode":  false, // Generate migration script
+    },
+}
+```
+
+## Features
+
+### Full DDL Generation
+
+Generates complete database structure:
+- CREATE SCHEMA statements
+- CREATE TABLE with all columns and types
+- PRIMARY KEY constraints
+- FOREIGN KEY constraints with actions
+- UNIQUE constraints
+- CHECK constraints
+- CREATE INDEX statements
+- CREATE VIEW statements
+- CREATE SEQUENCE statements
+
+### Migration Mode
+
+When `migration_mode` is enabled, generates migration scripts with:
+- Version tracking
+- Up/down migrations
+- Transactional DDL
+- Rollback support
+
+### Audit Triggers
+
+When `include_audit` is enabled, adds:
+- Created/updated timestamp triggers
+- Audit logging functionality
+- Change tracking
+
+## PostgreSQL-Specific Features
+
+- Serial types (SERIAL, BIGSERIAL)
+- Advanced types (UUID, JSONB, ARRAY)
+- Schema-qualified names
+- Constraint actions (CASCADE, RESTRICT, SET NULL)
+- Partial indexes
+- Function-based indexes
+- Check constraints with expressions
+
+## Data Types
+
+Supports all PostgreSQL data types:
+- Integer types: SMALLINT, INTEGER, BIGINT, SERIAL, BIGSERIAL
+- Numeric types: NUMERIC, DECIMAL, REAL, DOUBLE PRECISION
+- String types: VARCHAR, CHAR, TEXT
+- Date/Time: DATE, TIME, TIMESTAMP, TIMESTAMPTZ, INTERVAL
+- Boolean: BOOLEAN
+- Binary: BYTEA
+- JSON: JSON, JSONB
+- UUID: UUID
+- Network: INET, CIDR, MACADDR
+- Special: ARRAY, HSTORE
+
+## Notes
+
+- Generated SQL is formatted and readable
+- Comments are preserved from source schema
+- Schema names are fully qualified
+- Default values are properly quoted
+- Constraint names follow PostgreSQL conventions
+- Compatible with PostgreSQL 12+

pkg/writers/prisma/README.md

@@ -0,0 +1,135 @@
+# Prisma Writer
+
+Generates Prisma schema files from database schema information.
+
+## Overview
+
+The Prisma Writer converts RelSpec's internal database model representation into Prisma schema language (`.prisma` files), complete with models, fields, relationships, and attributes.
+
+## Features
+
+- Generates Prisma schema syntax
+- Creates model definitions with proper field types
+- Adds Prisma attributes (@id, @unique, @default, etc.)
+- Generates relationship fields
+- Includes datasource and generator configurations
+- Maps table/column names with @map and @@map
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/prisma"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "schema.prisma",
+        Metadata: map[string]interface{}{
+            "datasource_provider": "postgresql",
+        },
+    }
+
+    writer := prisma.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate Prisma schema from PostgreSQL database
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output prisma \
+  --out-file schema.prisma
+
+# Convert GORM models to Prisma
+relspec --input gorm --in-file models.go --output prisma --out-file schema.prisma
+
+# Convert JSON to Prisma schema
+relspec --input json --in-file database.json --output prisma --out-file prisma/schema.prisma
+```
+
+## Generated Code Example
+
+```prisma
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+model User {
+  id        Int      @id @default(autoincrement())
+  username  String   @unique @db.VarChar(50)
+  email     String   @db.VarChar(100)
+  bio       String?  @db.Text
+  createdAt DateTime @default(now()) @map("created_at")
+
+  posts Post[]
+
+  @@map("users")
+}
+
+model Post {
+  id      Int     @id @default(autoincrement())
+  userId  Int     @map("user_id")
+  title   String  @db.VarChar(200)
+  content String? @db.Text
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("posts")
+}
+```
+
+## Supported Prisma Attributes
+
+### Field Attributes
+- `@id` - Primary key
+- `@unique` - Unique constraint
+- `@default()` - Default value
+- `@map()` - Column name mapping
+- `@db.*` - Database-specific types
+- `@relation()` - Relationship definition
+
+### Model Attributes
+- `@@map()` - Table name mapping
+- `@@unique()` - Composite unique constraints
+- `@@index()` - Index definitions
+- `@@id()` - Composite primary keys
+
+## Type Mapping
+
+| SQL Type | Prisma Type | Database Type |
+|----------|-------------|---------------|
+| bigint | Int | @db.BigInt |
+| integer | Int | - |
+| varchar(n) | String | @db.VarChar(n) |
+| text | String | @db.Text |
+| boolean | Boolean | - |
+| timestamp | DateTime | @db.Timestamp |
+| uuid | String | @db.Uuid |
+| json | Json | - |
+
+## Notes
+
+- Model names are PascalCase (e.g., `User`, `Post`)
+- Field names are camelCase with `@map` for snake_case columns
+- Table names use `@@map` when different from model name
+- Nullable fields are marked with `?`
+- Relationship fields are automatically generated
+- Datasource provider defaults to `postgresql`

pkg/writers/prisma/writer.go

@@ -0,0 +1,551 @@
+package prisma
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+// Writer implements the writers.Writer interface for Prisma schema format
+type Writer struct {
+	options *writers.WriterOptions
+}
+
+// NewWriter creates a new Prisma writer with the given options
+func NewWriter(options *writers.WriterOptions) *Writer {
+	return &Writer{
+		options: options,
+	}
+}
+
+// WriteDatabase writes a Database model to Prisma schema format
+func (w *Writer) WriteDatabase(db *models.Database) error {
+	content := w.databaseToPrisma(db)
+
+	if w.options.OutputPath != "" {
+		return os.WriteFile(w.options.OutputPath, []byte(content), 0644)
+	}
+
+	fmt.Print(content)
+	return nil
+}
+
+// WriteSchema writes a Schema model to Prisma schema format
+func (w *Writer) WriteSchema(schema *models.Schema) error {
+	// Create temporary database for schema
+	db := models.InitDatabase("database")
+	db.Schemas = []*models.Schema{schema}
+
+	return w.WriteDatabase(db)
+}
+
+// WriteTable writes a Table model to Prisma schema format
+func (w *Writer) WriteTable(table *models.Table) error {
+	// Create temporary schema and database for table
+	schema := models.InitSchema(table.Schema)
+	schema.Tables = []*models.Table{table}
+
+	return w.WriteSchema(schema)
+}
+
+// databaseToPrisma converts a Database to Prisma schema format string
+func (w *Writer) databaseToPrisma(db *models.Database) string {
+	var sb strings.Builder
+
+	// Write datasource block
+	sb.WriteString(w.generateDatasource(db))
+	sb.WriteString("\n")
+
+	// Write generator block
+	sb.WriteString(w.generateGenerator())
+	sb.WriteString("\n")
+
+	// Process all schemas (typically just one in Prisma)
+	for _, schema := range db.Schemas {
+		// Write enums
+		if len(schema.Enums) > 0 {
+			for _, enum := range schema.Enums {
+				sb.WriteString(w.enumToPrisma(enum))
+				sb.WriteString("\n")
+			}
+		}
+
+		// Identify join tables for implicit M2M
+		joinTables := w.identifyJoinTables(schema)
+
+		// Write models (excluding join tables)
+		for _, table := range schema.Tables {
+			if joinTables[table.Name] {
+				continue // Skip join tables
+			}
+			sb.WriteString(w.tableToPrisma(table, schema, joinTables))
+			sb.WriteString("\n")
+		}
+	}
+
+	return sb.String()
+}
+
+// generateDatasource generates the datasource block
+func (w *Writer) generateDatasource(db *models.Database) string {
+	provider := "postgresql"
+
+	// Map database type to Prisma provider
+	switch db.DatabaseType {
+	case models.PostgresqlDatabaseType:
+		provider = "postgresql"
+	case models.MSSQLDatabaseType:
+		provider = "sqlserver"
+	case models.SqlLiteDatabaseType:
+		provider = "sqlite"
+	case "mysql":
+		provider = "mysql"
+	}
+
+	return fmt.Sprintf(`datasource db {
+  provider = "%s"
+  url      = env("DATABASE_URL")
+}
+`, provider)
+}
+
+// generateGenerator generates the generator block
+func (w *Writer) generateGenerator() string {
+	return `generator client {
+  provider = "prisma-client-js"
+}
+`
+}
+
+// enumToPrisma converts an Enum to Prisma enum block
+func (w *Writer) enumToPrisma(enum *models.Enum) string {
+	var sb strings.Builder
+
+	sb.WriteString(fmt.Sprintf("enum %s {\n", enum.Name))
+	for _, value := range enum.Values {
+		sb.WriteString(fmt.Sprintf("  %s\n", value))
+	}
+	sb.WriteString("}\n")
+
+	return sb.String()
+}
+
+// identifyJoinTables identifies tables that are join tables for M2M relations
+func (w *Writer) identifyJoinTables(schema *models.Schema) map[string]bool {
+	joinTables := make(map[string]bool)
+
+	for _, table := range schema.Tables {
+		// Check if this is a join table:
+		// 1. Starts with _ (Prisma convention)
+		// 2. Has exactly 2 FK constraints
+		// 3. Has composite PK with those 2 columns
+		// 4. Has no other columns except the FK columns
+
+		if !strings.HasPrefix(table.Name, "_") {
+			continue
+		}
+
+		fks := table.GetForeignKeys()
+		if len(fks) != 2 {
+			continue
+		}
+
+		// Check if columns are only the FK columns
+		if len(table.Columns) != 2 {
+			continue
+		}
+
+		// Check if both FK columns are part of PK
+		pkCols := 0
+		for _, col := range table.Columns {
+			if col.IsPrimaryKey {
+				pkCols++
+			}
+		}
+
+		if pkCols == 2 {
+			joinTables[table.Name] = true
+		}
+	}
+
+	return joinTables
+}
+
+// tableToPrisma converts a Table to Prisma model block
+func (w *Writer) tableToPrisma(table *models.Table, schema *models.Schema, joinTables map[string]bool) string {
+	var sb strings.Builder
+
+	sb.WriteString(fmt.Sprintf("model %s {\n", table.Name))
+
+	// Collect columns to write
+	columns := make([]*models.Column, 0, len(table.Columns))
+	for _, col := range table.Columns {
+		columns = append(columns, col)
+	}
+
+	// Sort columns for consistent output
+	sort.Slice(columns, func(i, j int) bool {
+		return columns[i].Name < columns[j].Name
+	})
+
+	// Write scalar fields
+	for _, col := range columns {
+		// Skip if this column is part of a relation that will be output as array field
+		if w.isRelationColumn(col, table) {
+			// We'll output this with the relation field
+			continue
+		}
+
+		sb.WriteString(w.columnToField(col, table, schema))
+	}
+
+	// Write relation fields
+	sb.WriteString(w.generateRelationFields(table, schema, joinTables))
+
+	// Write block attributes (@@id, @@unique, @@index)
+	sb.WriteString(w.generateBlockAttributes(table))
+
+	sb.WriteString("}\n")
+
+	return sb.String()
+}
+
+// columnToField converts a Column to a Prisma field definition
+func (w *Writer) columnToField(col *models.Column, table *models.Table, schema *models.Schema) string {
+	var sb strings.Builder
+
+	// Field name
+	sb.WriteString(fmt.Sprintf("  %s", col.Name))
+
+	// Field type
+	prismaType := w.sqlTypeToPrisma(col.Type, schema)
+	sb.WriteString(fmt.Sprintf(" %s", prismaType))
+
+	// Optional modifier
+	if !col.NotNull && !col.IsPrimaryKey {
+		sb.WriteString("?")
+	}
+
+	// Field attributes
+	attributes := w.generateFieldAttributes(col, table)
+	if attributes != "" {
+		sb.WriteString(" ")
+		sb.WriteString(attributes)
+	}
+
+	sb.WriteString("\n")
+
+	return sb.String()
+}
+
+// sqlTypeToPrisma converts SQL types to Prisma types
+func (w *Writer) sqlTypeToPrisma(sqlType string, schema *models.Schema) string {
+	// Check if it's an enum
+	for _, enum := range schema.Enums {
+		if strings.EqualFold(sqlType, enum.Name) {
+			return enum.Name
+		}
+	}
+
+	// Standard type mapping
+	typeMap := map[string]string{
+		"text":              "String",
+		"varchar":           "String",
+		"character varying": "String",
+		"char":              "String",
+		"boolean":           "Boolean",
+		"bool":              "Boolean",
+		"integer":           "Int",
+		"int":               "Int",
+		"int4":              "Int",
+		"bigint":            "BigInt",
+		"int8":              "BigInt",
+		"double precision":  "Float",
+		"float":             "Float",
+		"float8":            "Float",
+		"decimal":           "Decimal",
+		"numeric":           "Decimal",
+		"timestamp":         "DateTime",
+		"timestamptz":       "DateTime",
+		"date":              "DateTime",
+		"jsonb":             "Json",
+		"json":              "Json",
+		"bytea":             "Bytes",
+	}
+
+	for sqlPattern, prismaType := range typeMap {
+		if strings.Contains(strings.ToLower(sqlType), sqlPattern) {
+			return prismaType
+		}
+	}
+
+	// Default to String for unknown types
+	return "String"
+}
+
+// generateFieldAttributes generates field attributes like @id, @unique, @default
+func (w *Writer) generateFieldAttributes(col *models.Column, table *models.Table) string {
+	attrs := make([]string, 0)
+
+	// @id
+	if col.IsPrimaryKey {
+		// Check if this is part of a composite key
+		pkCount := 0
+		for _, c := range table.Columns {
+			if c.IsPrimaryKey {
+				pkCount++
+			}
+		}
+		if pkCount == 1 {
+			attrs = append(attrs, "@id")
+		}
+	}
+
+	// @unique
+	if w.hasUniqueConstraint(col.Name, table) {
+		attrs = append(attrs, "@unique")
+	}
+
+	// @default
+	if col.AutoIncrement {
+		attrs = append(attrs, "@default(autoincrement())")
+	} else if col.Default != nil {
+		defaultAttr := w.formatDefaultValue(col.Default)
+		if defaultAttr != "" {
+			attrs = append(attrs, fmt.Sprintf("@default(%s)", defaultAttr))
+		}
+	}
+
+	// @updatedAt (check comment)
+	if strings.Contains(col.Comment, "@updatedAt") {
+		attrs = append(attrs, "@updatedAt")
+	}
+
+	return strings.Join(attrs, " ")
+}
+
+// formatDefaultValue formats a default value for Prisma
+func (w *Writer) formatDefaultValue(defaultValue any) string {
+	switch v := defaultValue.(type) {
+	case string:
+		if v == "now()" {
+			return "now()"
+		} else if v == "gen_random_uuid()" {
+			return "uuid()"
+		} else if strings.Contains(strings.ToLower(v), "uuid") {
+			return "uuid()"
+		} else {
+			// String literal
+			return fmt.Sprintf(`"%s"`, v)
+		}
+	case bool:
+		if v {
+			return "true"
+		}
+		return "false"
+	case int, int64, int32:
+		return fmt.Sprintf("%v", v)
+	default:
+		return fmt.Sprintf("%v", v)
+	}
+}
+
+// hasUniqueConstraint checks if a column has a unique constraint
+func (w *Writer) hasUniqueConstraint(colName string, table *models.Table) bool {
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.UniqueConstraint &&
+			len(constraint.Columns) == 1 &&
+			constraint.Columns[0] == colName {
+			return true
+		}
+	}
+	return false
+}
+
+// isRelationColumn checks if a column is a FK column
+func (w *Writer) isRelationColumn(col *models.Column, table *models.Table) bool {
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			for _, fkCol := range constraint.Columns {
+				if fkCol == col.Name {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+// generateRelationFields generates relation fields and their FK columns
+func (w *Writer) generateRelationFields(table *models.Table, schema *models.Schema, joinTables map[string]bool) string {
+	var sb strings.Builder
+
+	// Get all FK constraints
+	fks := table.GetForeignKeys()
+
+	for _, fk := range fks {
+		// Generate the FK scalar field
+		for _, fkCol := range fk.Columns {
+			if col, exists := table.Columns[fkCol]; exists {
+				sb.WriteString(w.columnToField(col, table, schema))
+			}
+		}
+
+		// Generate the relation field
+		relationType := fk.ReferencedTable
+		isOptional := false
+
+		// Check if FK column is nullable
+		for _, fkCol := range fk.Columns {
+			if col, exists := table.Columns[fkCol]; exists {
+				if !col.NotNull {
+					isOptional = true
+				}
+			}
+		}
+
+		relationName := relationType
+		if strings.HasSuffix(strings.ToLower(relationName), "s") {
+			relationName = relationName[:len(relationName)-1]
+		}
+
+		sb.WriteString(fmt.Sprintf("  %s %s", strings.ToLower(relationName), relationType))
+
+		if isOptional {
+			sb.WriteString("?")
+		}
+
+		// @relation attribute
+		relationAttr := w.generateRelationAttribute(fk)
+		if relationAttr != "" {
+			sb.WriteString(" ")
+			sb.WriteString(relationAttr)
+		}
+
+		sb.WriteString("\n")
+	}
+
+	// Generate inverse relations (arrays) for tables that reference this one
+	sb.WriteString(w.generateInverseRelations(table, schema, joinTables))
+
+	return sb.String()
+}
+
+// generateRelationAttribute generates the @relation(...) attribute
+func (w *Writer) generateRelationAttribute(fk *models.Constraint) string {
+	parts := make([]string, 0)
+
+	// fields
+	fieldsStr := strings.Join(fk.Columns, ", ")
+	parts = append(parts, fmt.Sprintf("fields: [%s]", fieldsStr))
+
+	// references
+	referencesStr := strings.Join(fk.ReferencedColumns, ", ")
+	parts = append(parts, fmt.Sprintf("references: [%s]", referencesStr))
+
+	// onDelete
+	if fk.OnDelete != "" {
+		parts = append(parts, fmt.Sprintf("onDelete: %s", fk.OnDelete))
+	}
+
+	// onUpdate
+	if fk.OnUpdate != "" {
+		parts = append(parts, fmt.Sprintf("onUpdate: %s", fk.OnUpdate))
+	}
+
+	return fmt.Sprintf("@relation(%s)", strings.Join(parts, ", "))
+}
+
+// generateInverseRelations generates array fields for reverse relationships
+func (w *Writer) generateInverseRelations(table *models.Table, schema *models.Schema, joinTables map[string]bool) string {
+	var sb strings.Builder
+
+	// Find all tables that have FKs pointing to this table
+	for _, otherTable := range schema.Tables {
+		if otherTable.Name == table.Name {
+			continue
+		}
+
+		// Check if this is a join table
+		if joinTables[otherTable.Name] {
+			// Handle implicit M2M
+			if w.isJoinTableFor(otherTable, table.Name) {
+				// Find the other side of the M2M
+				for _, fk := range otherTable.GetForeignKeys() {
+					if fk.ReferencedTable != table.Name {
+						// This is the other side
+						otherSide := fk.ReferencedTable
+						sb.WriteString(fmt.Sprintf("  %ss %s[]\n",
+							strings.ToLower(otherSide), otherSide))
+						break
+					}
+				}
+			}
+			continue
+		}
+
+		// Regular one-to-many inverse relation
+		for _, fk := range otherTable.GetForeignKeys() {
+			if fk.ReferencedTable == table.Name {
+				// This table is referenced by otherTable
+				pluralName := otherTable.Name
+				if !strings.HasSuffix(pluralName, "s") {
+					pluralName += "s"
+				}
+
+				sb.WriteString(fmt.Sprintf("  %s %s[]\n",
+					strings.ToLower(pluralName), otherTable.Name))
+			}
+		}
+	}
+
+	return sb.String()
+}
+
+// isJoinTableFor checks if a table is a join table involving the specified model
+func (w *Writer) isJoinTableFor(joinTable *models.Table, modelName string) bool {
+	for _, fk := range joinTable.GetForeignKeys() {
+		if fk.ReferencedTable == modelName {
+			return true
+		}
+	}
+	return false
+}
+
+// generateBlockAttributes generates block-level attributes like @@id, @@unique, @@index
+func (w *Writer) generateBlockAttributes(table *models.Table) string {
+	var sb strings.Builder
+
+	// @@id for composite primary key
+	pkCols := make([]string, 0)
+	for _, col := range table.Columns {
+		if col.IsPrimaryKey {
+			pkCols = append(pkCols, col.Name)
+		}
+	}
+
+	if len(pkCols) > 1 {
+		sort.Strings(pkCols)
+		sb.WriteString(fmt.Sprintf("  @@id([%s])\n", strings.Join(pkCols, ", ")))
+	}
+
+	// @@unique for multi-column unique constraints
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.UniqueConstraint && len(constraint.Columns) > 1 {
+			sb.WriteString(fmt.Sprintf("  @@unique([%s])\n", strings.Join(constraint.Columns, ", ")))
+		}
+	}
+
+	// @@index for indexes
+	for _, index := range table.Indexes {
+		if !index.Unique { // Unique indexes are handled by @@unique
+			sb.WriteString(fmt.Sprintf("  @@index([%s])\n", strings.Join(index.Columns, ", ")))
+		}
+	}
+
+	return sb.String()
+}

pkg/writers/typeorm/README.md

@@ -0,0 +1,169 @@
+# TypeORM Writer
+
+Generates TypeScript files with TypeORM entity definitions from database schema information.
+
+## Overview
+
+The TypeORM Writer converts RelSpec's internal database model representation into TypeScript source code with TypeORM entity classes, including proper decorators, relationships, and column configurations.
+
+## Features
+
+- Generates TypeORM-compatible TypeScript entities
+- Creates proper decorator usage (@Entity, @Column, etc.)
+- Adds relationship decorators (@OneToMany, @ManyToOne, @JoinColumn)
+- Handles column types and options
+- Supports constraints and indexes
+- Outputs formatted TypeScript code
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/typeorm"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "entities/",
+    }
+
+    writer := typeorm.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Generate TypeORM entities from PostgreSQL database
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output typeorm \
+  --out-file entities/
+
+# Convert GORM models to TypeORM
+relspec --input gorm --in-file models.go --output typeorm --out-file src/entities/
+
+# Convert JSON to TypeORM entities
+relspec --input json --in-file schema.json --output typeorm --out-file entities/
+```
+
+## Generated Code Example
+
+```typescript
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  OneToMany,
+  ManyToOne,
+  JoinColumn,
+  Index,
+} from 'typeorm';
+import { Post } from './Post';
+
+@Entity('users')
+export class User {
+  @PrimaryGeneratedColumn('increment')
+  id: number;
+
+  @Column({ type: 'varchar', length: 50, unique: true })
+  @Index()
+  username: string;
+
+  @Column({ type: 'varchar', length: 100 })
+  email: string;
+
+  @Column({ type: 'text', nullable: true })
+  bio: string | null;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @OneToMany(() => Post, (post) => post.user)
+  posts: Post[];
+}
+
+@Entity('posts')
+export class Post {
+  @PrimaryGeneratedColumn('increment')
+  id: number;
+
+  @Column({ name: 'user_id' })
+  userId: number;
+
+  @Column({ type: 'varchar', length: 200 })
+  title: string;
+
+  @Column({ type: 'text', nullable: true })
+  content: string | null;
+
+  @ManyToOne(() => User, (user) => user.posts, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'user_id' })
+  user: User;
+}
+```
+
+## Supported TypeORM Decorators
+
+### Entity Decorators
+- `@Entity()` - Define entity/table
+- `@PrimaryGeneratedColumn()` - Auto-increment primary key
+- `@PrimaryColumn()` - Primary key
+- `@Column()` - Column definition
+- `@CreateDateColumn()` - Auto-set creation timestamp
+- `@UpdateDateColumn()` - Auto-update timestamp
+
+### Relationship Decorators
+- `@OneToMany()` - One-to-many relationship
+- `@ManyToOne()` - Many-to-one relationship
+- `@JoinColumn()` - Foreign key column specification
+
+### Constraint Decorators
+- `@Index()` - Create index
+- `@Unique()` - Unique constraint
+
+## Column Options
+
+```typescript
+@Column({
+  type: 'varchar',      // Column type
+  length: 255,          // Length for varchar/char
+  nullable: true,       // Allow NULL
+  unique: true,         // Unique constraint
+  default: 'value',     // Default value
+  name: 'column_name',  // Database column name
+})
+```
+
+## Type Mapping
+
+| SQL Type | TypeScript Type | TypeORM Type |
+|----------|-----------------|--------------|
+| bigint | number | 'bigint' |
+| integer | number | 'int' |
+| varchar | string | 'varchar' |
+| text | string | 'text' |
+| boolean | boolean | 'boolean' |
+| timestamp | Date | 'timestamp' |
+| json | object | 'json' |
+| uuid | string | 'uuid' |
+
+## Notes
+
+- Entity class names are PascalCase
+- One file per entity (named after the entity)
+- Relationship imports are auto-generated
+- Nullable columns use TypeScript union with `null`
+- Foreign key actions (CASCADE, etc.) are included
+- Schema names can be specified in `@Entity()` decorator

pkg/writers/typeorm/writer.go

@@ -0,0 +1,631 @@
+package typeorm
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+// Writer implements the writers.Writer interface for TypeORM entity format
+type Writer struct {
+	options *writers.WriterOptions
+}
+
+// NewWriter creates a new TypeORM writer with the given options
+func NewWriter(options *writers.WriterOptions) *Writer {
+	return &Writer{
+		options: options,
+	}
+}
+
+// WriteDatabase writes a Database model to TypeORM entity format
+func (w *Writer) WriteDatabase(db *models.Database) error {
+	content := w.databaseToTypeORM(db)
+
+	if w.options.OutputPath != "" {
+		return os.WriteFile(w.options.OutputPath, []byte(content), 0644)
+	}
+
+	fmt.Print(content)
+	return nil
+}
+
+// WriteSchema writes a Schema model to TypeORM entity format
+func (w *Writer) WriteSchema(schema *models.Schema) error {
+	db := models.InitDatabase("database")
+	db.Schemas = []*models.Schema{schema}
+
+	return w.WriteDatabase(db)
+}
+
+// WriteTable writes a Table model to TypeORM entity format
+func (w *Writer) WriteTable(table *models.Table) error {
+	schema := models.InitSchema(table.Schema)
+	schema.Tables = []*models.Table{table}
+
+	return w.WriteSchema(schema)
+}
+
+// databaseToTypeORM converts a Database to TypeORM entity format string
+func (w *Writer) databaseToTypeORM(db *models.Database) string {
+	var sb strings.Builder
+
+	// Generate imports
+	sb.WriteString(w.generateImports(db))
+	sb.WriteString("\n")
+
+	// Process all schemas
+	for _, schema := range db.Schemas {
+		// Identify join tables
+		joinTables := w.identifyJoinTables(schema)
+
+		// Write entities (excluding join tables)
+		for _, table := range schema.Tables {
+			if joinTables[table.Name] {
+				continue
+			}
+			sb.WriteString(w.tableToEntity(table, schema, joinTables))
+			sb.WriteString("\n")
+		}
+
+		// Write view entities
+		for _, view := range schema.Views {
+			sb.WriteString(w.viewToEntity(view))
+			sb.WriteString("\n")
+		}
+	}
+
+	return sb.String()
+}
+
+// generateImports generates the TypeORM import statement
+func (w *Writer) generateImports(db *models.Database) string {
+	imports := make([]string, 0)
+
+	// Always include basic decorators
+	imports = append(imports, "Entity", "PrimaryGeneratedColumn", "Column")
+
+	// Check if we need relation decorators
+	needsManyToOne := false
+	needsOneToMany := false
+	needsManyToMany := false
+	needsJoinTable := false
+	needsCreateDate := false
+	needsUpdateDate := false
+	needsViewEntity := false
+
+	for _, schema := range db.Schemas {
+		// Check for views
+		if len(schema.Views) > 0 {
+			needsViewEntity = true
+		}
+
+		for _, table := range schema.Tables {
+			// Check for timestamp columns
+			for _, col := range table.Columns {
+				if col.Default == "now()" {
+					needsCreateDate = true
+				}
+				if strings.Contains(col.Comment, "auto-update") {
+					needsUpdateDate = true
+				}
+			}
+
+			// Check for relations
+			for _, constraint := range table.Constraints {
+				if constraint.Type == models.ForeignKeyConstraint {
+					needsManyToOne = true
+				}
+			}
+		}
+	}
+
+	// OneToMany is the inverse of ManyToOne
+	if needsManyToOne {
+		needsOneToMany = true
+	}
+
+	// Check for M2M (join tables indicate M2M relations)
+	joinTables := make(map[string]bool)
+	for _, schema := range db.Schemas {
+		jt := w.identifyJoinTables(schema)
+		for name := range jt {
+			joinTables[name] = true
+			needsManyToMany = true
+			needsJoinTable = true
+		}
+	}
+
+	if needsManyToOne {
+		imports = append(imports, "ManyToOne")
+	}
+	if needsOneToMany {
+		imports = append(imports, "OneToMany")
+	}
+	if needsManyToMany {
+		imports = append(imports, "ManyToMany")
+	}
+	if needsJoinTable {
+		imports = append(imports, "JoinTable")
+	}
+	if needsCreateDate {
+		imports = append(imports, "CreateDateColumn")
+	}
+	if needsUpdateDate {
+		imports = append(imports, "UpdateDateColumn")
+	}
+	if needsViewEntity {
+		imports = append(imports, "ViewEntity")
+	}
+
+	return fmt.Sprintf("import { %s } from 'typeorm';\n", strings.Join(imports, ", "))
+}
+
+// identifyJoinTables identifies tables that are join tables for M2M relations
+func (w *Writer) identifyJoinTables(schema *models.Schema) map[string]bool {
+	joinTables := make(map[string]bool)
+
+	for _, table := range schema.Tables {
+		// Check if this is a join table:
+		// 1. Has exactly 2 FK constraints
+		// 2. Has composite PK with those 2 columns
+		// 3. Has no other columns except the FK columns
+
+		fks := table.GetForeignKeys()
+		if len(fks) != 2 {
+			continue
+		}
+
+		// Check if columns are only the FK columns
+		if len(table.Columns) != 2 {
+			continue
+		}
+
+		// Check if both FK columns are part of PK
+		pkCols := 0
+		for _, col := range table.Columns {
+			if col.IsPrimaryKey {
+				pkCols++
+			}
+		}
+
+		if pkCols == 2 {
+			joinTables[table.Name] = true
+		}
+	}
+
+	return joinTables
+}
+
+// tableToEntity converts a Table to a TypeORM entity class
+func (w *Writer) tableToEntity(table *models.Table, schema *models.Schema, joinTables map[string]bool) string {
+	var sb strings.Builder
+
+	// Generate @Entity decorator with options
+	entityOptions := w.buildEntityOptions(table)
+	sb.WriteString(fmt.Sprintf("@Entity({\n%s\n})\n", entityOptions))
+
+	// Get class name (from metadata if different from table name)
+	className := table.Name
+	if table.Metadata != nil {
+		if classNameVal, ok := table.Metadata["class_name"]; ok {
+			if classNameStr, ok := classNameVal.(string); ok {
+				className = classNameStr
+			}
+		}
+	}
+
+	sb.WriteString(fmt.Sprintf("export class %s {\n", className))
+
+	// Collect and sort columns
+	columns := make([]*models.Column, 0, len(table.Columns))
+	for _, col := range table.Columns {
+		// Skip FK columns (they'll be represented as relations)
+		if w.isForeignKeyColumn(col, table) {
+			continue
+		}
+		columns = append(columns, col)
+	}
+
+	sort.Slice(columns, func(i, j int) bool {
+		// Put PK first, then alphabetical
+		if columns[i].IsPrimaryKey && !columns[j].IsPrimaryKey {
+			return true
+		}
+		if !columns[i].IsPrimaryKey && columns[j].IsPrimaryKey {
+			return false
+		}
+		return columns[i].Name < columns[j].Name
+	})
+
+	// Write scalar fields
+	for _, col := range columns {
+		sb.WriteString(w.columnToField(col, table))
+		sb.WriteString("\n")
+	}
+
+	// Write relation fields
+	sb.WriteString(w.generateRelationFields(table, schema, joinTables))
+
+	sb.WriteString("}\n")
+
+	return sb.String()
+}
+
+// viewToEntity converts a View to a TypeORM @ViewEntity class
+func (w *Writer) viewToEntity(view *models.View) string {
+	var sb strings.Builder
+
+	// Generate @ViewEntity decorator with expression
+	sb.WriteString("@ViewEntity({\n")
+	if view.Definition != "" {
+		// Format the SQL expression with proper indentation
+		sb.WriteString("  expression: `\n")
+		sb.WriteString("    ")
+		sb.WriteString(view.Definition)
+		sb.WriteString("\n  `,\n")
+	}
+	sb.WriteString("})\n")
+
+	// Generate class
+	sb.WriteString(fmt.Sprintf("export class %s {\n", view.Name))
+
+	// Generate field definitions (without decorators for view fields)
+	columns := make([]*models.Column, 0, len(view.Columns))
+	for _, col := range view.Columns {
+		columns = append(columns, col)
+	}
+	sort.Slice(columns, func(i, j int) bool {
+		return columns[i].Name < columns[j].Name
+	})
+
+	for _, col := range columns {
+		tsType := w.sqlTypeToTypeScript(col.Type)
+		sb.WriteString(fmt.Sprintf("  %s: %s;\n", col.Name, tsType))
+	}
+
+	sb.WriteString("}\n")
+
+	return sb.String()
+}
+
+// columnToField converts a Column to a TypeORM field
+func (w *Writer) columnToField(col *models.Column, table *models.Table) string {
+	var sb strings.Builder
+
+	// Generate decorator
+	if col.IsPrimaryKey {
+		if col.AutoIncrement {
+			sb.WriteString("  @PrimaryGeneratedColumn('increment')\n")
+		} else if col.Type == "uuid" || strings.Contains(fmt.Sprint(col.Default), "uuid") {
+			sb.WriteString("  @PrimaryGeneratedColumn('uuid')\n")
+		} else {
+			sb.WriteString("  @PrimaryGeneratedColumn()\n")
+		}
+	} else if col.Default == "now()" {
+		sb.WriteString("  @CreateDateColumn()\n")
+	} else if strings.Contains(col.Comment, "auto-update") {
+		sb.WriteString("  @UpdateDateColumn()\n")
+	} else {
+		// Regular @Column decorator
+		options := w.buildColumnOptions(col, table)
+		if options != "" {
+			sb.WriteString(fmt.Sprintf("  @Column({ %s })\n", options))
+		} else {
+			sb.WriteString("  @Column()\n")
+		}
+	}
+
+	// Generate field declaration
+	tsType := w.sqlTypeToTypeScript(col.Type)
+	nullable := ""
+	if !col.NotNull {
+		nullable = " | null"
+	}
+
+	sb.WriteString(fmt.Sprintf("  %s: %s%s;", col.Name, tsType, nullable))
+
+	return sb.String()
+}
+
+// buildColumnOptions builds the options object for @Column decorator
+func (w *Writer) buildColumnOptions(col *models.Column, table *models.Table) string {
+	options := make([]string, 0)
+
+	// Type (if not default)
+	if w.needsExplicitType(col.Type) {
+		options = append(options, fmt.Sprintf("type: '%s'", col.Type))
+	}
+
+	// Nullable
+	if !col.NotNull {
+		options = append(options, "nullable: true")
+	}
+
+	// Unique
+	if w.hasUniqueConstraint(col.Name, table) {
+		options = append(options, "unique: true")
+	}
+
+	// Default
+	if col.Default != nil && col.Default != "now()" {
+		defaultStr := fmt.Sprint(col.Default)
+		if defaultStr != "" {
+			options = append(options, fmt.Sprintf("default: '%s'", defaultStr))
+		}
+	}
+
+	return strings.Join(options, ", ")
+}
+
+// needsExplicitType checks if a SQL type needs explicit type declaration
+func (w *Writer) needsExplicitType(sqlType string) bool {
+	// Types that don't map cleanly to TypeScript types need explicit declaration
+	explicitTypes := []string{"text", "uuid", "jsonb", "bigint"}
+	for _, t := range explicitTypes {
+		if strings.Contains(sqlType, t) {
+			return true
+		}
+	}
+	return false
+}
+
+// hasUniqueConstraint checks if a column has a unique constraint
+func (w *Writer) hasUniqueConstraint(colName string, table *models.Table) bool {
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.UniqueConstraint &&
+			len(constraint.Columns) == 1 &&
+			constraint.Columns[0] == colName {
+			return true
+		}
+	}
+	return false
+}
+
+// sqlTypeToTypeScript converts SQL types to TypeScript types
+func (w *Writer) sqlTypeToTypeScript(sqlType string) string {
+	typeMap := map[string]string{
+		"text":              "string",
+		"varchar":           "string",
+		"character varying": "string",
+		"char":              "string",
+		"uuid":              "string",
+		"boolean":           "boolean",
+		"bool":              "boolean",
+		"integer":           "number",
+		"int":               "number",
+		"bigint":            "number",
+		"double precision":  "number",
+		"float":             "number",
+		"decimal":           "number",
+		"numeric":           "number",
+		"timestamp":         "Date",
+		"timestamptz":       "Date",
+		"date":              "Date",
+		"jsonb":             "any",
+		"json":              "any",
+	}
+
+	for sqlPattern, tsType := range typeMap {
+		if strings.Contains(strings.ToLower(sqlType), sqlPattern) {
+			return tsType
+		}
+	}
+
+	return "any"
+}
+
+// isForeignKeyColumn checks if a column is a FK column
+func (w *Writer) isForeignKeyColumn(col *models.Column, table *models.Table) bool {
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			for _, fkCol := range constraint.Columns {
+				if fkCol == col.Name {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+// generateRelationFields generates relation fields for a table
+func (w *Writer) generateRelationFields(table *models.Table, schema *models.Schema, joinTables map[string]bool) string {
+	var sb strings.Builder
+
+	// Get all FK constraints
+	fks := table.GetForeignKeys()
+
+	// Generate @ManyToOne fields
+	for _, fk := range fks {
+		relatedTable := fk.ReferencedTable
+		fieldName := strings.ToLower(relatedTable)
+
+		// Determine if nullable
+		isNullable := false
+		for _, fkCol := range fk.Columns {
+			if col, exists := table.Columns[fkCol]; exists {
+				if !col.NotNull {
+					isNullable = true
+				}
+			}
+		}
+
+		nullable := ""
+		if isNullable {
+			nullable = " | null"
+		}
+
+		// Find inverse field name if possible
+		inverseField := w.findInverseFieldName(table.Name, relatedTable, schema)
+
+		if inverseField != "" {
+			sb.WriteString(fmt.Sprintf("  @ManyToOne(() => %s, %s => %s.%s)\n",
+				relatedTable, strings.ToLower(relatedTable), strings.ToLower(relatedTable), inverseField))
+		} else {
+			if isNullable {
+				sb.WriteString(fmt.Sprintf("  @ManyToOne(() => %s, { nullable: true })\n", relatedTable))
+			} else {
+				sb.WriteString(fmt.Sprintf("  @ManyToOne(() => %s)\n", relatedTable))
+			}
+		}
+
+		sb.WriteString(fmt.Sprintf("  %s: %s%s;\n", fieldName, relatedTable, nullable))
+		sb.WriteString("\n")
+	}
+
+	// Generate @OneToMany fields (inverse of FKs pointing to this table)
+	w.generateInverseRelations(table, schema, joinTables, &sb)
+
+	// Generate @ManyToMany fields
+	w.generateManyToManyRelations(table, schema, joinTables, &sb)
+
+	return sb.String()
+}
+
+// findInverseFieldName finds the inverse field name for a relation
+func (w *Writer) findInverseFieldName(fromTable, toTable string, schema *models.Schema) string {
+	// Look for tables that have FKs pointing back to fromTable
+	for _, table := range schema.Tables {
+		if table.Name != toTable {
+			continue
+		}
+
+		for _, constraint := range table.Constraints {
+			if constraint.Type == models.ForeignKeyConstraint && constraint.ReferencedTable == fromTable {
+				// Found an inverse relation
+				// Use pluralized form of fromTable
+				return w.pluralize(strings.ToLower(fromTable))
+			}
+		}
+	}
+
+	return ""
+}
+
+// generateInverseRelations generates @OneToMany fields
+func (w *Writer) generateInverseRelations(table *models.Table, schema *models.Schema, joinTables map[string]bool, sb *strings.Builder) {
+	for _, otherTable := range schema.Tables {
+		if otherTable.Name == table.Name || joinTables[otherTable.Name] {
+			continue
+		}
+
+		for _, fk := range otherTable.GetForeignKeys() {
+			if fk.ReferencedTable == table.Name {
+				// This table is referenced by otherTable
+				fieldName := w.pluralize(strings.ToLower(otherTable.Name))
+				inverseName := strings.ToLower(table.Name)
+
+				fmt.Fprintf(sb, "  @OneToMany(() => %s, %s => %s.%s)\n",
+					otherTable.Name, strings.ToLower(otherTable.Name), strings.ToLower(otherTable.Name), inverseName)
+				fmt.Fprintf(sb, "  %s: %s[];\n", fieldName, otherTable.Name)
+				sb.WriteString("\n")
+			}
+		}
+	}
+}
+
+// generateManyToManyRelations generates @ManyToMany fields
+func (w *Writer) generateManyToManyRelations(table *models.Table, schema *models.Schema, joinTables map[string]bool, sb *strings.Builder) {
+	for joinTableName := range joinTables {
+		joinTable := w.findTable(joinTableName, schema)
+		if joinTable == nil {
+			continue
+		}
+
+		fks := joinTable.GetForeignKeys()
+		if len(fks) != 2 {
+			continue
+		}
+
+		// Check if this table is part of the M2M relation
+		var thisTableFK *models.Constraint
+		var otherTableFK *models.Constraint
+
+		for i, fk := range fks {
+			if fk.ReferencedTable == table.Name {
+				thisTableFK = fk
+				if i == 0 {
+					otherTableFK = fks[1]
+				} else {
+					otherTableFK = fks[0]
+				}
+			}
+		}
+
+		if thisTableFK == nil {
+			continue
+		}
+
+		// Determine which side owns the relation (has @JoinTable)
+		// We'll make the first entity alphabetically the owner
+		isOwner := table.Name < otherTableFK.ReferencedTable
+
+		otherTable := otherTableFK.ReferencedTable
+		fieldName := w.pluralize(strings.ToLower(otherTable))
+		inverseName := w.pluralize(strings.ToLower(table.Name))
+
+		if isOwner {
+			fmt.Fprintf(sb, "  @ManyToMany(() => %s, %s => %s.%s)\n",
+				otherTable, strings.ToLower(otherTable), strings.ToLower(otherTable), inverseName)
+			sb.WriteString("  @JoinTable()\n")
+		} else {
+			fmt.Fprintf(sb, "  @ManyToMany(() => %s, %s => %s.%s)\n",
+				otherTable, strings.ToLower(otherTable), strings.ToLower(otherTable), inverseName)
+		}
+
+		fmt.Fprintf(sb, "  %s: %s[];\n", fieldName, otherTable)
+		sb.WriteString("\n")
+	}
+}
+
+// findTable finds a table by name in a schema
+func (w *Writer) findTable(name string, schema *models.Schema) *models.Table {
+	for _, table := range schema.Tables {
+		if table.Name == name {
+			return table
+		}
+	}
+	return nil
+}
+
+// buildEntityOptions builds the options object for @Entity decorator
+func (w *Writer) buildEntityOptions(table *models.Table) string {
+	options := make([]string, 0)
+
+	// Always include table name
+	options = append(options, fmt.Sprintf("  name: \"%s\"", table.Name))
+
+	// Always include schema
+	options = append(options, fmt.Sprintf("  schema: \"%s\"", table.Schema))
+
+	// Database name from metadata
+	if table.Metadata != nil {
+		if database, ok := table.Metadata["database"]; ok {
+			if databaseStr, ok := database.(string); ok {
+				options = append(options, fmt.Sprintf("  database: \"%s\"", databaseStr))
+			}
+		}
+
+		// Engine from metadata
+		if engine, ok := table.Metadata["engine"]; ok {
+			if engineStr, ok := engine.(string); ok {
+				options = append(options, fmt.Sprintf("  engine: \"%s\"", engineStr))
+			}
+		}
+	}
+
+	return strings.Join(options, ",\n")
+}
+
+// pluralize adds 's' to make a word plural (simple version)
+func (w *Writer) pluralize(word string) string {
+	if strings.HasSuffix(word, "s") {
+		return word
+	}
+	return word + "s"
+}

pkg/writers/yaml/README.md

@@ -0,0 +1,212 @@
+# YAML Writer
+
+Generates database schema definitions in YAML format.
+
+## Overview
+
+The YAML Writer converts RelSpec's internal database model representation into YAML format, providing a human-readable, structured representation of the database schema.
+
+## Features
+
+- Generates RelSpec's canonical YAML schema format
+- Human-readable alternative to JSON
+- Complete schema representation including:
+  - Databases and schemas
+  - Tables, columns, and data types
+  - Constraints (PK, FK, unique, check)
+  - Indexes
+  - Relationships
+  - Views and sequences
+- Supports comments
+- Ideal for manual editing and configuration
+
+## Usage
+
+### Basic Example
+
+```go
+package main
+
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/yaml"
+)
+
+func main() {
+    options := &writers.WriterOptions{
+        OutputPath: "schema.yaml",
+    }
+
+    writer := yaml.NewWriter(options)
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+### CLI Examples
+
+```bash
+# Export PostgreSQL database to YAML
+relspec --input pgsql \
+  --conn "postgres://localhost/mydb" \
+  --output yaml \
+  --out-file schema.yaml
+
+# Convert GORM models to YAML
+relspec --input gorm --in-file models.go --output yaml --out-file schema.yaml
+
+# Convert JSON to YAML
+relspec --input json --in-file schema.json --output yaml --out-file schema.yaml
+```
+
+## Generated YAML Example
+
+```yaml
+name: myapp
+database_type: postgresql
+source_format: pgsql
+schemas:
+  - name: public
+    tables:
+      - name: users
+        schema: public
+        columns:
+          id:
+            name: id
+            table: users
+            schema: public
+            type: bigint
+            not_null: true
+            is_primary_key: true
+            auto_increment: true
+            sequence: 1
+          username:
+            name: username
+            table: users
+            schema: public
+            type: varchar
+            length: 50
+            not_null: true
+            sequence: 2
+          email:
+            name: email
+            table: users
+            schema: public
+            type: varchar
+            length: 100
+            not_null: true
+            sequence: 3
+        constraints:
+          pk_users:
+            name: pk_users
+            type: PRIMARY KEY
+            table: users
+            schema: public
+            columns:
+              - id
+          uq_users_username:
+            name: uq_users_username
+            type: UNIQUE
+            table: users
+            schema: public
+            columns:
+              - username
+        indexes:
+          idx_users_email:
+            name: idx_users_email
+            table: users
+            schema: public
+            columns:
+              - email
+            unique: false
+            type: btree
+
+      - name: posts
+        schema: public
+        columns:
+          id:
+            name: id
+            type: bigint
+            not_null: true
+            is_primary_key: true
+            sequence: 1
+          user_id:
+            name: user_id
+            type: bigint
+            not_null: true
+            sequence: 2
+          title:
+            name: title
+            type: varchar
+            length: 200
+            not_null: true
+            sequence: 3
+          content:
+            name: content
+            type: text
+            not_null: false
+            sequence: 4
+        constraints:
+          fk_posts_user_id:
+            name: fk_posts_user_id
+            type: FOREIGN KEY
+            table: posts
+            schema: public
+            columns:
+              - user_id
+            referenced_table: users
+            referenced_schema: public
+            referenced_columns:
+              - id
+            on_delete: CASCADE
+            on_update: NO ACTION
+        indexes:
+          idx_posts_user_id:
+            name: idx_posts_user_id
+            columns:
+              - user_id
+            unique: false
+            type: btree
+    views: []
+    sequences: []
+```
+
+## Schema Structure
+
+The YAML format mirrors the JSON structure with human-readable syntax:
+
+- Database level: `name`, `database_type`, `source_format`, `schemas`
+- Schema level: `name`, `tables`, `views`, `sequences`
+- Table level: `name`, `schema`, `columns`, `constraints`, `indexes`
+- Column level: `name`, `type`, `length`, `not_null`, etc.
+- Constraint level: `name`, `type`, `columns`, foreign key details
+- Index level: `name`, `columns`, `unique`, `type`
+
+## Advantages Over JSON
+
+- More human-readable
+- Easier to edit manually
+- Supports comments
+- Less verbose (no braces/brackets)
+- Better for configuration files
+- Natural indentation
+
+## Use Cases
+
+- **Configuration** - Schema as configuration
+- **Documentation** - Human-readable schema docs
+- **Version Control** - Easier to read diffs
+- **Manual Editing** - Easier to modify by hand
+- **Code Generation** - Template-friendly format
+
+## Notes
+
+- Output is properly indented (2 spaces)
+- Preserves all schema metadata
+- Can be round-tripped with YAML reader
+- Compatible with YAML 1.2
+- More readable than JSON for large schemas
+- Ideal for documentation and manual workflows

tests/assets/bun/complex.go

@@ -0,0 +1,60 @@
+package models
+
+import (
+	"time"
+
+	"github.com/uptrace/bun"
+)
+
+// ModelUser represents a user in the system
+type ModelUser struct {
+	bun.BaseModel `bun:"table:users,alias:u"`
+
+	ID        int64     `bun:"id,pk,autoincrement,type:bigint"`
+	Username  string    `bun:"username,notnull,type:varchar(100),unique:idx_username"`
+	Email     string    `bun:"email,notnull,type:varchar(255),unique"`
+	Password  string    `bun:"password,notnull,type:varchar(255)"`
+	FirstName *string   `bun:"first_name,type:varchar(100)"`
+	LastName  *string   `bun:"last_name,type:varchar(100)"`
+	Bio       *string   `bun:"bio,type:text"`
+	IsActive  bool      `bun:"is_active,type:boolean"`
+	CreatedAt time.Time `bun:"created_at,type:timestamp"`
+	UpdatedAt time.Time `bun:"updated_at,type:timestamp"`
+
+	Posts []*ModelPost `bun:"rel:has-many,join:id=user_id"`
+}
+
+// ModelPost represents a blog post
+type ModelPost struct {
+	bun.BaseModel `bun:"table:posts,alias:p"`
+
+	ID          int64      `bun:"id,pk,autoincrement,type:bigint"`
+	UserID      int64      `bun:"user_id,notnull,type:bigint"`
+	Title       string     `bun:"title,notnull,type:varchar(255)"`
+	Slug        string     `bun:"slug,notnull,type:varchar(255),unique:idx_slug"`
+	Content     string     `bun:"content,notnull,type:text"`
+	Excerpt     *string    `bun:"excerpt,type:text"`
+	Published   bool       `bun:"published,type:boolean"`
+	ViewCount   int64      `bun:"view_count,type:bigint"`
+	PublishedAt *time.Time `bun:"published_at,type:timestamp,nullzero"`
+	CreatedAt   time.Time  `bun:"created_at,type:timestamp"`
+	UpdatedAt   time.Time  `bun:"updated_at,type:timestamp"`
+
+	User     *ModelUser      `bun:"rel:belongs-to,join:user_id=id"`
+	Comments []*ModelComment `bun:"rel:has-many,join:id=post_id"`
+}
+
+// ModelComment represents a comment on a post
+type ModelComment struct {
+	bun.BaseModel `bun:"table:comments,alias:c"`
+
+	ID        int64     `bun:"id,pk,autoincrement,type:bigint"`
+	PostID    int64     `bun:"post_id,notnull,type:bigint"`
+	UserID    *int64    `bun:"user_id,type:bigint"`
+	Content   string    `bun:"content,notnull,type:text"`
+	CreatedAt time.Time `bun:"created_at,type:timestamp"`
+	UpdatedAt time.Time `bun:"updated_at,type:timestamp"`
+
+	Post *ModelPost `bun:"rel:belongs-to,join:post_id=id"`
+	User *ModelUser `bun:"rel:belongs-to,join:user_id=id"`
+}

tests/assets/bun/simple.go

@@ -0,0 +1,18 @@
+package models
+
+import (
+	"time"
+
+	"github.com/uptrace/bun"
+)
+
+type User struct {
+	bun.BaseModel `bun:"table:users,alias:u"`
+
+	ID        int64     `bun:"id,pk,autoincrement,type:bigint"`
+	Email     string    `bun:"email,notnull,type:varchar(255),unique"`
+	Name      string    `bun:"name,type:text"`
+	Age       *int      `bun:"age,type:integer"`
+	IsActive  bool      `bun:"is_active,type:boolean"`
+	CreatedAt time.Time `bun:"created_at,type:timestamp,default:now()"`
+}

tests/assets/drizzle/schema-updated.ts

@@ -0,0 +1,156 @@
+// Code generated by relspecgo. DO NOT EDIT.
+import { pgTable, pgEnum, integer, bigint, smallint, serial, bigserial, smallserial, text, varchar, char, boolean, numeric, real, doublePrecision, timestamp, date, time, interval, json, jsonb, uuid, bytea } from 'drizzle-orm/pg-core';
+import { sql } from 'drizzle-orm';
+
+
+// Enums
+export const userRole = pgEnum('UserRole', ['admin', 'user', 'moderator', 'guest']);
+export const orderStatus = pgEnum('OrderStatus', ['pending', 'processing', 'shipped', 'delivered', 'cancelled']);
+
+
+// Table: users
+export const users = pgTable('users', {
+  id: serial('id').primaryKey(),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  email: varchar('email').notNull().unique(),
+  isActive: boolean('is_active').notNull().default(true),
+  lastLoginAt: timestamp('last_login_at'),
+  passwordHash: varchar('password_hash').notNull(),
+  profile: jsonb('profile'),
+  role: pgEnum('UserRole')('role').notNull(),
+  updatedAt: timestamp('updated_at').notNull().default(sql`now()`),
+  username: varchar('username').notNull().unique(),
+});
+
+// Types for users
+export type Users = typeof users.$inferSelect;
+export type NewUsers = typeof users.$inferInsert;
+// Table: profiles
+export const profiles = pgTable('profiles', {
+  id: serial('id').primaryKey(),
+  avatarUrl: varchar('avatar_url'),
+  bio: text('bio'),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  dateOfBirth: date('date_of_birth'),
+  firstName: varchar('first_name'),
+  lastName: varchar('last_name'),
+  phoneNumber: varchar('phone_number'),
+  updatedAt: timestamp('updated_at').notNull().default(sql`now()`),
+  userId: integer('user_id').notNull().unique().references(() => users.id),
+});
+
+// Types for profiles
+export type Profiles = typeof profiles.$inferSelect;
+export type NewProfiles = typeof profiles.$inferInsert;
+// Table: posts
+export const posts = pgTable('posts', {
+  id: serial('id').primaryKey(),
+  authorId: integer('author_id').notNull().references(() => users.id),
+  content: text('content').notNull(),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  excerpt: text('excerpt'),
+  featuredImage: varchar('featured_image'),
+  isPublished: boolean('is_published').notNull().default(false),
+  publishedAt: timestamp('published_at'),
+  slug: varchar('slug').notNull().unique(),
+  title: varchar('title').notNull(),
+  updatedAt: timestamp('updated_at').notNull().default(sql`now()`),
+  viewCount: integer('view_count').notNull().default(0),
+});
+
+// Types for posts
+export type Posts = typeof posts.$inferSelect;
+export type NewPosts = typeof posts.$inferInsert;
+// Table: comments
+export const comments = pgTable('comments', {
+  id: serial('id').primaryKey(),
+  authorId: integer('author_id').notNull().references(() => users.id),
+  content: text('content').notNull(),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  isApproved: boolean('is_approved').notNull().default(false),
+  parentId: integer('parent_id').references(() => comments.id),
+  postId: integer('post_id').notNull().references(() => posts.id),
+  updatedAt: timestamp('updated_at').notNull().default(sql`now()`),
+});
+
+// Types for comments
+export type Comments = typeof comments.$inferSelect;
+export type NewComments = typeof comments.$inferInsert;
+// Table: categories
+export const categories = pgTable('categories', {
+  id: serial('id').primaryKey(),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  description: text('description'),
+  name: varchar('name').notNull().unique(),
+  parentId: integer('parent_id').references(() => categories.id),
+  slug: varchar('slug').notNull().unique(),
+  updatedAt: timestamp('updated_at').notNull().default(sql`now()`),
+});
+
+// Types for categories
+export type Categories = typeof categories.$inferSelect;
+export type NewCategories = typeof categories.$inferInsert;
+// Table: post_categories
+export const postCategories = pgTable('post_categories', {
+  categoryId: integer('category_id').notNull().references(() => categories.id),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  postId: integer('post_id').notNull().references(() => posts.id),
+});
+
+// Types for post_categories
+export type PostCategories = typeof postCategories.$inferSelect;
+export type NewPostCategories = typeof postCategories.$inferInsert;
+// Table: tags
+export const tags = pgTable('tags', {
+  id: serial('id').primaryKey(),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  name: varchar('name').notNull().unique(),
+  slug: varchar('slug').notNull().unique(),
+});
+
+// Types for tags
+export type Tags = typeof tags.$inferSelect;
+export type NewTags = typeof tags.$inferInsert;
+// Table: post_tags
+export const postTags = pgTable('post_tags', {
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  postId: integer('post_id').notNull().references(() => posts.id),
+  tagId: integer('tag_id').notNull().references(() => tags.id),
+});
+
+// Types for post_tags
+export type PostTags = typeof postTags.$inferSelect;
+export type NewPostTags = typeof postTags.$inferInsert;
+// Table: orders
+export const orders = pgTable('orders', {
+  id: serial('id').primaryKey(),
+  billingAddress: jsonb('billing_address').notNull(),
+  completedAt: timestamp('completed_at'),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  currency: varchar('currency').notNull().default('USD'),
+  notes: text('notes'),
+  orderNumber: varchar('order_number').notNull().unique(),
+  shippingAddress: jsonb('shipping_address').notNull(),
+  status: pgEnum('OrderStatus')('status').notNull().default('pending'),
+  totalAmount: numeric('total_amount').notNull(),
+  updatedAt: timestamp('updated_at').notNull().default(sql`now()`),
+  userId: integer('user_id').notNull().references(() => users.id),
+});
+
+// Types for orders
+export type Orders = typeof orders.$inferSelect;
+export type NewOrders = typeof orders.$inferInsert;
+// Table: sessions
+export const sessions = pgTable('sessions', {
+  id: uuid('id').primaryKey().default(sql`gen_random_uuid()`),
+  createdAt: timestamp('created_at').notNull().default(sql`now()`),
+  expiresAt: timestamp('expires_at').notNull(),
+  ipAddress: varchar('ip_address'),
+  token: varchar('token').notNull().unique(),
+  userAgent: text('user_agent'),
+  userId: integer('user_id').notNull().references(() => users.id),
+});
+
+// Types for sessions
+export type Sessions = typeof sessions.$inferSelect;
+export type NewSessions = typeof sessions.$inferInsert;

tests/assets/drizzle/schema.ts

@@ -0,0 +1,90 @@
+// Code generated by relspecgo. DO NOT EDIT.
+import { pgTable, pgEnum, integer, bigint, smallint, serial, bigserial, smallserial, text, varchar, char, boolean, numeric, real, doublePrecision, timestamp, date, time, interval, json, jsonb, uuid, bytea } from 'drizzle-orm/pg-core';
+import { sql } from 'drizzle-orm';
+
+
+// Enums
+export const role = pgEnum('Role', ['USER', 'ADMIN']);
+export type Role = 'USER' | 'ADMIN';
+
+
+// Table: User
+export interface User {
+  id: number;
+  email: string;
+  name: string | null;
+  profile: string | null;
+  role: Role;
+}
+
+export const user = pgTable('User', {
+  id: integer('id').primaryKey().generatedAlwaysAsIdentity(),
+  email: text('email').notNull().unique(),
+  name: text('name'),
+  profile: text('profile'),
+  role: pgEnum('Role')('role').notNull().default('USER'),
+});
+
+export type NewUser = typeof user.$inferInsert;
+// Table: Profile
+export interface Profile {
+  id: number;
+  bio: string;
+  user: string;
+  userId: number;
+}
+
+export const profile = pgTable('Profile', {
+  id: integer('id').primaryKey().generatedAlwaysAsIdentity(),
+  bio: text('bio').notNull(),
+  user: text('user').notNull(),
+  userId: integer('userId').notNull().unique().references(() => user.id),
+});
+
+export type NewProfile = typeof profile.$inferInsert;
+// Table: Post
+export interface Post {
+  id: number;
+  author: string;
+  authorId: number;
+  createdAt: Date;
+  published: boolean;
+  title: string;
+  updatedAt: Date; // @updatedAt
+}
+
+export const post = pgTable('Post', {
+  id: integer('id').primaryKey().generatedAlwaysAsIdentity(),
+  author: text('author').notNull(),
+  authorId: integer('authorId').notNull().references(() => user.id),
+  createdAt: timestamp('createdAt').notNull().default(sql`now()`),
+  published: boolean('published').notNull().default(false),
+  title: text('title').notNull(),
+  updatedAt: timestamp('updatedAt').notNull(), // @updatedAt
+});
+
+export type NewPost = typeof post.$inferInsert;
+// Table: Category
+export interface Category {
+  id: number;
+  name: string;
+}
+
+export const category = pgTable('Category', {
+  id: integer('id').primaryKey().generatedAlwaysAsIdentity(),
+  name: text('name').notNull(),
+});
+
+export type NewCategory = typeof category.$inferInsert;
+// Table: _CategoryToPost
+export interface Categorytopost {
+  categoryId: number;
+  postId: number;
+}
+
+export const Categorytopost = pgTable('_CategoryToPost', {
+  categoryId: integer('CategoryId').primaryKey().references(() => category.id),
+  postId: integer('PostId').primaryKey().references(() => post.id),
+});
+
+export type NewCategorytopost = typeof Categorytopost.$inferInsert;

tests/assets/gorm/complex.go

@@ -0,0 +1,65 @@
+package models
+
+import (
+	"time"
+)
+
+// ModelUser represents a user in the system
+type ModelUser struct {
+	ID        int64     `gorm:"column:id;primaryKey;autoIncrement;type:bigint"`
+	Username  string    `gorm:"column:username;type:varchar(100);not null;uniqueIndex:idx_username"`
+	Email     string    `gorm:"column:email;type:varchar(255);not null;uniqueIndex"`
+	Password  string    `gorm:"column:password;type:varchar(255);not null"`
+	FirstName *string   `gorm:"column:first_name;type:varchar(100)"`
+	LastName  *string   `gorm:"column:last_name;type:varchar(100)"`
+	Bio       *string   `gorm:"column:bio;type:text"`
+	IsActive  bool      `gorm:"column:is_active;type:boolean;default:true"`
+	CreatedAt time.Time `gorm:"column:created_at;type:timestamp;default:now()"`
+	UpdatedAt time.Time `gorm:"column:updated_at;type:timestamp;default:now()"`
+
+	Posts    []*ModelPost    `gorm:"foreignKey:UserID;association_foreignkey:ID;constraint:OnDelete:CASCADE,OnUpdate:CASCADE"`
+	Comments []*ModelComment `gorm:"foreignKey:UserID;association_foreignkey:ID;constraint:OnDelete:SET NULL"`
+}
+
+func (ModelUser) TableName() string {
+	return "users"
+}
+
+// ModelPost represents a blog post
+type ModelPost struct {
+	ID          int64      `gorm:"column:id;primaryKey;autoIncrement;type:bigint"`
+	UserID      int64      `gorm:"column:user_id;type:bigint;not null;index:idx_user_id"`
+	Title       string     `gorm:"column:title;type:varchar(255);not null"`
+	Slug        string     `gorm:"column:slug;type:varchar(255);not null;uniqueIndex:idx_slug"`
+	Content     string     `gorm:"column:content;type:text;not null"`
+	Excerpt     *string    `gorm:"column:excerpt;type:text"`
+	Published   bool       `gorm:"column:published;type:boolean;default:false"`
+	ViewCount   int64      `gorm:"column:view_count;type:bigint;default:0"`
+	PublishedAt *time.Time `gorm:"column:published_at;type:timestamp"`
+	CreatedAt   time.Time  `gorm:"column:created_at;type:timestamp;default:now()"`
+	UpdatedAt   time.Time  `gorm:"column:updated_at;type:timestamp;default:now()"`
+
+	User     *ModelUser      `gorm:"foreignKey:UserID;references:ID;constraint:OnDelete:CASCADE,OnUpdate:CASCADE"`
+	Comments []*ModelComment `gorm:"foreignKey:PostID;association_foreignkey:ID;constraint:OnDelete:CASCADE"`
+}
+
+func (ModelPost) TableName() string {
+	return "posts"
+}
+
+// ModelComment represents a comment on a post
+type ModelComment struct {
+	ID        int64      `gorm:"column:id;primaryKey;autoIncrement;type:bigint"`
+	PostID    int64      `gorm:"column:post_id;type:bigint;not null;index:idx_post_id"`
+	UserID    *int64     `gorm:"column:user_id;type:bigint;index:idx_user_id"`
+	Content   string     `gorm:"column:content;type:text;not null"`
+	CreatedAt time.Time  `gorm:"column:created_at;type:timestamp;default:now()"`
+	UpdatedAt time.Time  `gorm:"column:updated_at;type:timestamp;default:now()"`
+
+	Post *ModelPost `gorm:"foreignKey:PostID;references:ID;constraint:OnDelete:CASCADE"`
+	User *ModelUser `gorm:"foreignKey:UserID;references:ID;constraint:OnDelete:SET NULL"`
+}
+
+func (ModelComment) TableName() string {
+	return "comments"
+}

tests/assets/gorm/simple.go

@@ -0,0 +1,18 @@
+package models
+
+import (
+	"time"
+)
+
+type User struct {
+	ID        int64     `gorm:"column:id;primaryKey;autoIncrement;type:bigint"`
+	Email     string    `gorm:"column:email;type:varchar(255);not null"`
+	Name      string    `gorm:"column:name;type:text"`
+	Age       *int      `gorm:"column:age;type:integer"`
+	IsActive  bool      `gorm:"column:is_active;type:boolean"`
+	CreatedAt time.Time `gorm:"column:created_at;type:timestamp;default:now()"`
+}
+
+func (User) TableName() string {
+	return "users"
+}

tests/assets/graphql/complex.graphql

@@ -0,0 +1,46 @@
+# Complex GraphQL schema with multiple features
+
+scalar DateTime
+scalar JSON
+scalar Date
+
+enum Role {
+  USER
+  ADMIN
+  MODERATOR
+}
+
+type User {
+  id: ID!
+  email: String!
+  name: String!
+  role: Role!
+  createdAt: DateTime!
+  posts: [Post!]!
+  profile: Profile
+}
+
+type Profile {
+  id: ID!
+  bio: String
+  avatar: String
+  metadata: JSON
+  user: User!
+}
+
+type Post {
+  id: ID!
+  title: String!
+  slug: String!
+  content: String
+  published: Boolean!
+  publishedAt: Date
+  author: User!
+  tags: [Tag!]!
+}
+
+type Tag {
+  id: ID!
+  name: String!
+  posts: [Post!]!
+}

tests/assets/graphql/custom_scalars.graphql

@@ -0,0 +1,13 @@
+# GraphQL schema with custom scalars
+
+scalar DateTime
+scalar JSON
+scalar Date
+
+type User {
+  id: ID!
+  email: String!
+  createdAt: DateTime!
+  metadata: JSON
+  birthDate: Date
+}

tests/assets/graphql/enums.graphql

@@ -0,0 +1,13 @@
+# GraphQL schema with enums
+
+enum Role {
+  ADMIN
+  USER
+  GUEST
+}
+
+type User {
+  id: ID!
+  email: String!
+  role: Role!
+}

tests/assets/graphql/relations.graphql

@@ -0,0 +1,16 @@
+# GraphQL schema with relationships
+
+type User {
+  id: ID!
+  email: String!
+  name: String!
+  posts: [Post!]!
+}
+
+type Post {
+  id: ID!
+  title: String!
+  content: String
+  published: Boolean!
+  author: User!
+}

tests/assets/graphql/simple.graphql

@@ -0,0 +1,9 @@
+# Simple GraphQL schema for testing basic type parsing
+
+type User {
+  id: ID!
+  email: String!
+  name: String
+  age: Int
+  active: Boolean!
+}

tests/assets/prisma/example.prisma

@@ -0,0 +1,46 @@
+datasource db {
+  provider = "postgresql"
+}
+
+generator client {
+  provider = "prisma-client"
+  output   = "./generated"
+}
+
+model User {
+  id      Int      @id @default(autoincrement())
+  email   String   @unique
+  name    String?
+  role    Role     @default(USER)
+  posts   Post[]
+  profile Profile?
+}
+
+model Profile {
+  id     Int    @id @default(autoincrement())
+  bio    String
+  user   User   @relation(fields: [userId], references: [id])
+  userId Int    @unique
+}
+
+model Post {
+  id         Int        @id @default(autoincrement())
+  createdAt  DateTime   @default(now())
+  updatedAt  DateTime   @updatedAt
+  title      String
+  published  Boolean    @default(false)
+  author     User       @relation(fields: [authorId], references: [id])
+  authorId   Int
+  categories Category[]
+}
+
+model Category {
+  id    Int    @id @default(autoincrement())
+  name  String
+  posts Post[]
+}
+
+enum Role {
+  USER
+  ADMIN
+}

tests/assets/typeorm/example.ts

@@ -0,0 +1,115 @@
+//@ts-nocheck
+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, OneToMany, ManyToMany, JoinTable, CreateDateColumn, UpdateDateColumn } from 'typeorm';
+
+@Entity()
+export class User {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ unique: true })
+  email: string;
+
+  @Column()
+  name: string;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+
+  @OneToMany(() => Project, project => project.owner)
+  ownedProjects: Project[];
+
+  @ManyToMany(() => Project, project => project.members)
+  @JoinTable()
+  projects: Project[];
+}
+
+@Entity()
+export class Project {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  title: string;
+
+  @Column({ nullable: true })
+  description: string;
+
+  @Column({ default: 'active' })
+  status: string;
+
+  @ManyToOne(() => User, user => user.ownedProjects)
+  owner: User;
+
+  @ManyToMany(() => User, user => user.projects)
+  members: User[];
+
+  @OneToMany(() => Task, task => task.project)
+  tasks: Task[];
+
+  @CreateDateColumn()
+  createdAt: Date;
+}
+
+@Entity()
+export class Task {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  title: string;
+
+  @Column({ type: 'text', nullable: true })
+  description: string;
+
+  @Column({ default: 'todo' })
+  status: string;
+
+  @Column({ nullable: true })
+  dueDate: Date;
+
+  @ManyToOne(() => Project, project => project.tasks)
+  project: Project;
+
+  @ManyToOne(() => User, { nullable: true })
+  assignee: User;
+
+  @OneToMany(() => Comment, comment => comment.task)
+  comments: Comment[];
+}
+
+@Entity()
+export class Comment {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column('text')
+  content: string;
+
+  @ManyToOne(() => Task, task => task.comments)
+  task: Task;
+
+  @ManyToOne(() => User)
+  author: User;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}
+
+@Entity()
+export class Tag {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ unique: true })
+  name: string;
+
+  @Column()
+  color: string;
+
+  @ManyToMany(() => Task)
+  @JoinTable()
+  tasks: Task[];
+}

vendor/github.com/davecgh/go-spew/LICENSE

@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2012-2016 Dave Collins <dave@davec.name>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

vendor/github.com/davecgh/go-spew/spew/bypass.go

@@ -0,0 +1,145 @@
+// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when the code is not running on Google App Engine, compiled by GopherJS, and
+// "-tags safe" is not added to the go build command line.  The "disableunsafe"
+// tag is deprecated and thus should not be used.
+// Go versions prior to 1.4 are disabled because they use a different layout
+// for interfaces which make the implementation of unsafeReflectValue more complex.
+// +build !js,!appengine,!safe,!disableunsafe,go1.4
+
+package spew
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+const (
+	// UnsafeDisabled is a build-time constant which specifies whether or
+	// not access to the unsafe package is available.
+	UnsafeDisabled = false
+
+	// ptrSize is the size of a pointer on the current arch.
+	ptrSize = unsafe.Sizeof((*byte)(nil))
+)
+
+type flag uintptr
+
+var (
+	// flagRO indicates whether the value field of a reflect.Value
+	// is read-only.
+	flagRO flag
+
+	// flagAddr indicates whether the address of the reflect.Value's
+	// value may be taken.
+	flagAddr flag
+)
+
+// flagKindMask holds the bits that make up the kind
+// part of the flags field. In all the supported versions,
+// it is in the lower 5 bits.
+const flagKindMask = flag(0x1f)
+
+// Different versions of Go have used different
+// bit layouts for the flags type. This table
+// records the known combinations.
+var okFlags = []struct {
+	ro, addr flag
+}{{
+	// From Go 1.4 to 1.5
+	ro:   1 << 5,
+	addr: 1 << 7,
+}, {
+	// Up to Go tip.
+	ro:   1<<5 | 1<<6,
+	addr: 1 << 8,
+}}
+
+var flagValOffset = func() uintptr {
+	field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+	if !ok {
+		panic("reflect.Value has no flag field")
+	}
+	return field.Offset
+}()
+
+// flagField returns a pointer to the flag field of a reflect.Value.
+func flagField(v *reflect.Value) *flag {
+	return (*flag)(unsafe.Pointer(uintptr(unsafe.Pointer(v)) + flagValOffset))
+}
+
+// unsafeReflectValue converts the passed reflect.Value into a one that bypasses
+// the typical safety restrictions preventing access to unaddressable and
+// unexported data.  It works by digging the raw pointer to the underlying
+// value out of the protected value and generating a new unprotected (unsafe)
+// reflect.Value to it.
+//
+// This allows us to check for implementations of the Stringer and error
+// interfaces to be used for pretty printing ordinarily unaddressable and
+// inaccessible values such as unexported struct fields.
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+	if !v.IsValid() || (v.CanInterface() && v.CanAddr()) {
+		return v
+	}
+	flagFieldPtr := flagField(&v)
+	*flagFieldPtr &^= flagRO
+	*flagFieldPtr |= flagAddr
+	return v
+}
+
+// Sanity checks against future reflect package changes
+// to the type or semantics of the Value.flag field.
+func init() {
+	field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+	if !ok {
+		panic("reflect.Value has no flag field")
+	}
+	if field.Type.Kind() != reflect.TypeOf(flag(0)).Kind() {
+		panic("reflect.Value flag field has changed kind")
+	}
+	type t0 int
+	var t struct {
+		A t0
+		// t0 will have flagEmbedRO set.
+		t0
+		// a will have flagStickyRO set
+		a t0
+	}
+	vA := reflect.ValueOf(t).FieldByName("A")
+	va := reflect.ValueOf(t).FieldByName("a")
+	vt0 := reflect.ValueOf(t).FieldByName("t0")
+
+	// Infer flagRO from the difference between the flags
+	// for the (otherwise identical) fields in t.
+	flagPublic := *flagField(&vA)
+	flagWithRO := *flagField(&va) | *flagField(&vt0)
+	flagRO = flagPublic ^ flagWithRO
+
+	// Infer flagAddr from the difference between a value
+	// taken from a pointer and not.
+	vPtrA := reflect.ValueOf(&t).Elem().FieldByName("A")
+	flagNoPtr := *flagField(&vA)
+	flagPtr := *flagField(&vPtrA)
+	flagAddr = flagNoPtr ^ flagPtr
+
+	// Check that the inferred flags tally with one of the known versions.
+	for _, f := range okFlags {
+		if flagRO == f.ro && flagAddr == f.addr {
+			return
+		}
+	}
+	panic("reflect.Value read-only flag has changed semantics")
+}

vendor/github.com/davecgh/go-spew/spew/bypasssafe.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when the code is running on Google App Engine, compiled by GopherJS, or
+// "-tags safe" is added to the go build command line.  The "disableunsafe"
+// tag is deprecated and thus should not be used.
+// +build js appengine safe disableunsafe !go1.4
+
+package spew
+
+import "reflect"
+
+const (
+	// UnsafeDisabled is a build-time constant which specifies whether or
+	// not access to the unsafe package is available.
+	UnsafeDisabled = true
+)
+
+// unsafeReflectValue typically converts the passed reflect.Value into a one
+// that bypasses the typical safety restrictions preventing access to
+// unaddressable and unexported data.  However, doing this relies on access to
+// the unsafe package.  This is a stub version which simply returns the passed
+// reflect.Value when the unsafe package is not available.
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+	return v
+}

vendor/github.com/davecgh/go-spew/spew/common.go

@@ -0,0 +1,341 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"reflect"
+	"sort"
+	"strconv"
+)
+
+// Some constants in the form of bytes to avoid string overhead.  This mirrors
+// the technique used in the fmt package.
+var (
+	panicBytes            = []byte("(PANIC=")
+	plusBytes             = []byte("+")
+	iBytes                = []byte("i")
+	trueBytes             = []byte("true")
+	falseBytes            = []byte("false")
+	interfaceBytes        = []byte("(interface {})")
+	commaNewlineBytes     = []byte(",\n")
+	newlineBytes          = []byte("\n")
+	openBraceBytes        = []byte("{")
+	openBraceNewlineBytes = []byte("{\n")
+	closeBraceBytes       = []byte("}")
+	asteriskBytes         = []byte("*")
+	colonBytes            = []byte(":")
+	colonSpaceBytes       = []byte(": ")
+	openParenBytes        = []byte("(")
+	closeParenBytes       = []byte(")")
+	spaceBytes            = []byte(" ")
+	pointerChainBytes     = []byte("->")
+	nilAngleBytes         = []byte("<nil>")
+	maxNewlineBytes       = []byte("<max depth reached>\n")
+	maxShortBytes         = []byte("<max>")
+	circularBytes         = []byte("<already shown>")
+	circularShortBytes    = []byte("<shown>")
+	invalidAngleBytes     = []byte("<invalid>")
+	openBracketBytes      = []byte("[")
+	closeBracketBytes     = []byte("]")
+	percentBytes          = []byte("%")
+	precisionBytes        = []byte(".")
+	openAngleBytes        = []byte("<")
+	closeAngleBytes       = []byte(">")
+	openMapBytes          = []byte("map[")
+	closeMapBytes         = []byte("]")
+	lenEqualsBytes        = []byte("len=")
+	capEqualsBytes        = []byte("cap=")
+)
+
+// hexDigits is used to map a decimal value to a hex digit.
+var hexDigits = "0123456789abcdef"
+
+// catchPanic handles any panics that might occur during the handleMethods
+// calls.
+func catchPanic(w io.Writer, v reflect.Value) {
+	if err := recover(); err != nil {
+		w.Write(panicBytes)
+		fmt.Fprintf(w, "%v", err)
+		w.Write(closeParenBytes)
+	}
+}
+
+// handleMethods attempts to call the Error and String methods on the underlying
+// type the passed reflect.Value represents and outputes the result to Writer w.
+//
+// It handles panics in any called methods by catching and displaying the error
+// as the formatted value.
+func handleMethods(cs *ConfigState, w io.Writer, v reflect.Value) (handled bool) {
+	// We need an interface to check if the type implements the error or
+	// Stringer interface.  However, the reflect package won't give us an
+	// interface on certain things like unexported struct fields in order
+	// to enforce visibility rules.  We use unsafe, when it's available,
+	// to bypass these restrictions since this package does not mutate the
+	// values.
+	if !v.CanInterface() {
+		if UnsafeDisabled {
+			return false
+		}
+
+		v = unsafeReflectValue(v)
+	}
+
+	// Choose whether or not to do error and Stringer interface lookups against
+	// the base type or a pointer to the base type depending on settings.
+	// Technically calling one of these methods with a pointer receiver can
+	// mutate the value, however, types which choose to satisify an error or
+	// Stringer interface with a pointer receiver should not be mutating their
+	// state inside these interface methods.
+	if !cs.DisablePointerMethods && !UnsafeDisabled && !v.CanAddr() {
+		v = unsafeReflectValue(v)
+	}
+	if v.CanAddr() {
+		v = v.Addr()
+	}
+
+	// Is it an error or Stringer?
+	switch iface := v.Interface().(type) {
+	case error:
+		defer catchPanic(w, v)
+		if cs.ContinueOnMethod {
+			w.Write(openParenBytes)
+			w.Write([]byte(iface.Error()))
+			w.Write(closeParenBytes)
+			w.Write(spaceBytes)
+			return false
+		}
+
+		w.Write([]byte(iface.Error()))
+		return true
+
+	case fmt.Stringer:
+		defer catchPanic(w, v)
+		if cs.ContinueOnMethod {
+			w.Write(openParenBytes)
+			w.Write([]byte(iface.String()))
+			w.Write(closeParenBytes)
+			w.Write(spaceBytes)
+			return false
+		}
+		w.Write([]byte(iface.String()))
+		return true
+	}
+	return false
+}
+
+// printBool outputs a boolean value as true or false to Writer w.
+func printBool(w io.Writer, val bool) {
+	if val {
+		w.Write(trueBytes)
+	} else {
+		w.Write(falseBytes)
+	}
+}
+
+// printInt outputs a signed integer value to Writer w.
+func printInt(w io.Writer, val int64, base int) {
+	w.Write([]byte(strconv.FormatInt(val, base)))
+}
+
+// printUint outputs an unsigned integer value to Writer w.
+func printUint(w io.Writer, val uint64, base int) {
+	w.Write([]byte(strconv.FormatUint(val, base)))
+}
+
+// printFloat outputs a floating point value using the specified precision,
+// which is expected to be 32 or 64bit, to Writer w.
+func printFloat(w io.Writer, val float64, precision int) {
+	w.Write([]byte(strconv.FormatFloat(val, 'g', -1, precision)))
+}
+
+// printComplex outputs a complex value using the specified float precision
+// for the real and imaginary parts to Writer w.
+func printComplex(w io.Writer, c complex128, floatPrecision int) {
+	r := real(c)
+	w.Write(openParenBytes)
+	w.Write([]byte(strconv.FormatFloat(r, 'g', -1, floatPrecision)))
+	i := imag(c)
+	if i >= 0 {
+		w.Write(plusBytes)
+	}
+	w.Write([]byte(strconv.FormatFloat(i, 'g', -1, floatPrecision)))
+	w.Write(iBytes)
+	w.Write(closeParenBytes)
+}
+
+// printHexPtr outputs a uintptr formatted as hexadecimal with a leading '0x'
+// prefix to Writer w.
+func printHexPtr(w io.Writer, p uintptr) {
+	// Null pointer.
+	num := uint64(p)
+	if num == 0 {
+		w.Write(nilAngleBytes)
+		return
+	}
+
+	// Max uint64 is 16 bytes in hex + 2 bytes for '0x' prefix
+	buf := make([]byte, 18)
+
+	// It's simpler to construct the hex string right to left.
+	base := uint64(16)
+	i := len(buf) - 1
+	for num >= base {
+		buf[i] = hexDigits[num%base]
+		num /= base
+		i--
+	}
+	buf[i] = hexDigits[num]
+
+	// Add '0x' prefix.
+	i--
+	buf[i] = 'x'
+	i--
+	buf[i] = '0'
+
+	// Strip unused leading bytes.
+	buf = buf[i:]
+	w.Write(buf)
+}
+
+// valuesSorter implements sort.Interface to allow a slice of reflect.Value
+// elements to be sorted.
+type valuesSorter struct {
+	values  []reflect.Value
+	strings []string // either nil or same len and values
+	cs      *ConfigState
+}
+
+// newValuesSorter initializes a valuesSorter instance, which holds a set of
+// surrogate keys on which the data should be sorted.  It uses flags in
+// ConfigState to decide if and how to populate those surrogate keys.
+func newValuesSorter(values []reflect.Value, cs *ConfigState) sort.Interface {
+	vs := &valuesSorter{values: values, cs: cs}
+	if canSortSimply(vs.values[0].Kind()) {
+		return vs
+	}
+	if !cs.DisableMethods {
+		vs.strings = make([]string, len(values))
+		for i := range vs.values {
+			b := bytes.Buffer{}
+			if !handleMethods(cs, &b, vs.values[i]) {
+				vs.strings = nil
+				break
+			}
+			vs.strings[i] = b.String()
+		}
+	}
+	if vs.strings == nil && cs.SpewKeys {
+		vs.strings = make([]string, len(values))
+		for i := range vs.values {
+			vs.strings[i] = Sprintf("%#v", vs.values[i].Interface())
+		}
+	}
+	return vs
+}
+
+// canSortSimply tests whether a reflect.Kind is a primitive that can be sorted
+// directly, or whether it should be considered for sorting by surrogate keys
+// (if the ConfigState allows it).
+func canSortSimply(kind reflect.Kind) bool {
+	// This switch parallels valueSortLess, except for the default case.
+	switch kind {
+	case reflect.Bool:
+		return true
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		return true
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		return true
+	case reflect.Float32, reflect.Float64:
+		return true
+	case reflect.String:
+		return true
+	case reflect.Uintptr:
+		return true
+	case reflect.Array:
+		return true
+	}
+	return false
+}
+
+// Len returns the number of values in the slice.  It is part of the
+// sort.Interface implementation.
+func (s *valuesSorter) Len() int {
+	return len(s.values)
+}
+
+// Swap swaps the values at the passed indices.  It is part of the
+// sort.Interface implementation.
+func (s *valuesSorter) Swap(i, j int) {
+	s.values[i], s.values[j] = s.values[j], s.values[i]
+	if s.strings != nil {
+		s.strings[i], s.strings[j] = s.strings[j], s.strings[i]
+	}
+}
+
+// valueSortLess returns whether the first value should sort before the second
+// value.  It is used by valueSorter.Less as part of the sort.Interface
+// implementation.
+func valueSortLess(a, b reflect.Value) bool {
+	switch a.Kind() {
+	case reflect.Bool:
+		return !a.Bool() && b.Bool()
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		return a.Int() < b.Int()
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		return a.Uint() < b.Uint()
+	case reflect.Float32, reflect.Float64:
+		return a.Float() < b.Float()
+	case reflect.String:
+		return a.String() < b.String()
+	case reflect.Uintptr:
+		return a.Uint() < b.Uint()
+	case reflect.Array:
+		// Compare the contents of both arrays.
+		l := a.Len()
+		for i := 0; i < l; i++ {
+			av := a.Index(i)
+			bv := b.Index(i)
+			if av.Interface() == bv.Interface() {
+				continue
+			}
+			return valueSortLess(av, bv)
+		}
+	}
+	return a.String() < b.String()
+}
+
+// Less returns whether the value at index i should sort before the
+// value at index j.  It is part of the sort.Interface implementation.
+func (s *valuesSorter) Less(i, j int) bool {
+	if s.strings == nil {
+		return valueSortLess(s.values[i], s.values[j])
+	}
+	return s.strings[i] < s.strings[j]
+}
+
+// sortValues is a sort function that handles both native types and any type that
+// can be converted to error or Stringer.  Other inputs are sorted according to
+// their Value.String() value to ensure display stability.
+func sortValues(values []reflect.Value, cs *ConfigState) {
+	if len(values) == 0 {
+		return
+	}
+	sort.Sort(newValuesSorter(values, cs))
+}

vendor/github.com/davecgh/go-spew/spew/config.go

@@ -0,0 +1,306 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+)
+
+// ConfigState houses the configuration options used by spew to format and
+// display values.  There is a global instance, Config, that is used to control
+// all top-level Formatter and Dump functionality.  Each ConfigState instance
+// provides methods equivalent to the top-level functions.
+//
+// The zero value for ConfigState provides no indentation.  You would typically
+// want to set it to a space or a tab.
+//
+// Alternatively, you can use NewDefaultConfig to get a ConfigState instance
+// with default settings.  See the documentation of NewDefaultConfig for default
+// values.
+type ConfigState struct {
+	// Indent specifies the string to use for each indentation level.  The
+	// global config instance that all top-level functions use set this to a
+	// single space by default.  If you would like more indentation, you might
+	// set this to a tab with "\t" or perhaps two spaces with "  ".
+	Indent string
+
+	// MaxDepth controls the maximum number of levels to descend into nested
+	// data structures.  The default, 0, means there is no limit.
+	//
+	// NOTE: Circular data structures are properly detected, so it is not
+	// necessary to set this value unless you specifically want to limit deeply
+	// nested data structures.
+	MaxDepth int
+
+	// DisableMethods specifies whether or not error and Stringer interfaces are
+	// invoked for types that implement them.
+	DisableMethods bool
+
+	// DisablePointerMethods specifies whether or not to check for and invoke
+	// error and Stringer interfaces on types which only accept a pointer
+	// receiver when the current type is not a pointer.
+	//
+	// NOTE: This might be an unsafe action since calling one of these methods
+	// with a pointer receiver could technically mutate the value, however,
+	// in practice, types which choose to satisify an error or Stringer
+	// interface with a pointer receiver should not be mutating their state
+	// inside these interface methods.  As a result, this option relies on
+	// access to the unsafe package, so it will not have any effect when
+	// running in environments without access to the unsafe package such as
+	// Google App Engine or with the "safe" build tag specified.
+	DisablePointerMethods bool
+
+	// DisablePointerAddresses specifies whether to disable the printing of
+	// pointer addresses. This is useful when diffing data structures in tests.
+	DisablePointerAddresses bool
+
+	// DisableCapacities specifies whether to disable the printing of capacities
+	// for arrays, slices, maps and channels. This is useful when diffing
+	// data structures in tests.
+	DisableCapacities bool
+
+	// ContinueOnMethod specifies whether or not recursion should continue once
+	// a custom error or Stringer interface is invoked.  The default, false,
+	// means it will print the results of invoking the custom error or Stringer
+	// interface and return immediately instead of continuing to recurse into
+	// the internals of the data type.
+	//
+	// NOTE: This flag does not have any effect if method invocation is disabled
+	// via the DisableMethods or DisablePointerMethods options.
+	ContinueOnMethod bool
+
+	// SortKeys specifies map keys should be sorted before being printed. Use
+	// this to have a more deterministic, diffable output.  Note that only
+	// native types (bool, int, uint, floats, uintptr and string) and types
+	// that support the error or Stringer interfaces (if methods are
+	// enabled) are supported, with other types sorted according to the
+	// reflect.Value.String() output which guarantees display stability.
+	SortKeys bool
+
+	// SpewKeys specifies that, as a last resort attempt, map keys should
+	// be spewed to strings and sorted by those strings.  This is only
+	// considered if SortKeys is true.
+	SpewKeys bool
+}
+
+// Config is the active configuration of the top-level functions.
+// The configuration can be changed by modifying the contents of spew.Config.
+var Config = ConfigState{Indent: " "}
+
+// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the formatted string as a value that satisfies error.  See NewFormatter
+// for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Errorf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Errorf(format string, a ...interface{}) (err error) {
+	return fmt.Errorf(format, c.convertArgs(a)...)
+}
+
+// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprint(w, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprint(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprint(w, c.convertArgs(a)...)
+}
+
+// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintf(w, format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(w, format, c.convertArgs(a)...)
+}
+
+// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
+// passed with a Formatter interface returned by c.NewFormatter.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintln(w, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(w, c.convertArgs(a)...)
+}
+
+// Print is a wrapper for fmt.Print that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Print(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Print(a ...interface{}) (n int, err error) {
+	return fmt.Print(c.convertArgs(a)...)
+}
+
+// Printf is a wrapper for fmt.Printf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Printf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Printf(format, c.convertArgs(a)...)
+}
+
+// Println is a wrapper for fmt.Println that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Println(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Println(a ...interface{}) (n int, err error) {
+	return fmt.Println(c.convertArgs(a)...)
+}
+
+// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprint(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprint(a ...interface{}) string {
+	return fmt.Sprint(c.convertArgs(a)...)
+}
+
+// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprintf(format string, a ...interface{}) string {
+	return fmt.Sprintf(format, c.convertArgs(a)...)
+}
+
+// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
+// were passed with a Formatter interface returned by c.NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintln(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprintln(a ...interface{}) string {
+	return fmt.Sprintln(c.convertArgs(a)...)
+}
+
+/*
+NewFormatter returns a custom formatter that satisfies the fmt.Formatter
+interface.  As a result, it integrates cleanly with standard fmt package
+printing functions.  The formatter is useful for inline printing of smaller data
+types similar to the standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), and %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Typically this function shouldn't be called directly.  It is much easier to make
+use of the custom formatter by calling one of the convenience functions such as
+c.Printf, c.Println, or c.Printf.
+*/
+func (c *ConfigState) NewFormatter(v interface{}) fmt.Formatter {
+	return newFormatter(c, v)
+}
+
+// Fdump formats and displays the passed arguments to io.Writer w.  It formats
+// exactly the same as Dump.
+func (c *ConfigState) Fdump(w io.Writer, a ...interface{}) {
+	fdump(c, w, a...)
+}
+
+/*
+Dump displays the passed parameters to standard out with newlines, customizable
+indentation, and additional debug information such as complete types and all
+pointer addresses used to indirect to the final value.  It provides the
+following features over the built-in printing facilities provided by the fmt
+package:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output
+
+The configuration options are controlled by modifying the public members
+of c.  See ConfigState for options documentation.
+
+See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
+get the formatted result as a string.
+*/
+func (c *ConfigState) Dump(a ...interface{}) {
+	fdump(c, os.Stdout, a...)
+}
+
+// Sdump returns a string with the passed arguments formatted exactly the same
+// as Dump.
+func (c *ConfigState) Sdump(a ...interface{}) string {
+	var buf bytes.Buffer
+	fdump(c, &buf, a...)
+	return buf.String()
+}
+
+// convertArgs accepts a slice of arguments and returns a slice of the same
+// length with each argument converted to a spew Formatter interface using
+// the ConfigState associated with s.
+func (c *ConfigState) convertArgs(args []interface{}) (formatters []interface{}) {
+	formatters = make([]interface{}, len(args))
+	for index, arg := range args {
+		formatters[index] = newFormatter(c, arg)
+	}
+	return formatters
+}
+
+// NewDefaultConfig returns a ConfigState with the following default settings.
+//
+// 	Indent: " "
+// 	MaxDepth: 0
+// 	DisableMethods: false
+// 	DisablePointerMethods: false
+// 	ContinueOnMethod: false
+// 	SortKeys: false
+func NewDefaultConfig() *ConfigState {
+	return &ConfigState{Indent: " "}
+}

vendor/github.com/davecgh/go-spew/spew/doc.go

@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+Package spew implements a deep pretty printer for Go data structures to aid in
+debugging.
+
+A quick overview of the additional features spew provides over the built-in
+printing facilities for Go data types are as follows:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output (only when using
+	  Dump style)
+
+There are two different approaches spew allows for dumping Go data structures:
+
+	* Dump style which prints with newlines, customizable indentation,
+	  and additional debug information such as types and all pointer addresses
+	  used to indirect to the final value
+	* A custom Formatter interface that integrates cleanly with the standard fmt
+	  package and replaces %v, %+v, %#v, and %#+v to provide inline printing
+	  similar to the default %v while providing the additional functionality
+	  outlined above and passing unsupported format verbs such as %x and %q
+	  along to fmt
+
+Quick Start
+
+This section demonstrates how to quickly get started with spew.  See the
+sections below for further details on formatting and configuration options.
+
+To dump a variable with full newlines, indentation, type, and pointer
+information use Dump, Fdump, or Sdump:
+	spew.Dump(myVar1, myVar2, ...)
+	spew.Fdump(someWriter, myVar1, myVar2, ...)
+	str := spew.Sdump(myVar1, myVar2, ...)
+
+Alternatively, if you would prefer to use format strings with a compacted inline
+printing style, use the convenience wrappers Printf, Fprintf, etc with
+%v (most compact), %+v (adds pointer addresses), %#v (adds types), or
+%#+v (adds types and pointer addresses):
+	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+	spew.Fprintf(someWriter, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Fprintf(someWriter, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+
+Configuration Options
+
+Configuration of spew is handled by fields in the ConfigState type.  For
+convenience, all of the top-level functions use a global state available
+via the spew.Config global.
+
+It is also possible to create a ConfigState instance that provides methods
+equivalent to the top-level functions.  This allows concurrent configuration
+options.  See the ConfigState documentation for more details.
+
+The following configuration options are available:
+	* Indent
+		String to use for each indentation level for Dump functions.
+		It is a single space by default.  A popular alternative is "\t".
+
+	* MaxDepth
+		Maximum number of levels to descend into nested data structures.
+		There is no limit by default.
+
+	* DisableMethods
+		Disables invocation of error and Stringer interface methods.
+		Method invocation is enabled by default.
+
+	* DisablePointerMethods
+		Disables invocation of error and Stringer interface methods on types
+		which only accept pointer receivers from non-pointer variables.
+		Pointer method invocation is enabled by default.
+
+	* DisablePointerAddresses
+		DisablePointerAddresses specifies whether to disable the printing of
+		pointer addresses. This is useful when diffing data structures in tests.
+
+	* DisableCapacities
+		DisableCapacities specifies whether to disable the printing of
+		capacities for arrays, slices, maps and channels. This is useful when
+		diffing data structures in tests.
+
+	* ContinueOnMethod
+		Enables recursion into types after invoking error and Stringer interface
+		methods. Recursion after method invocation is disabled by default.
+
+	* SortKeys
+		Specifies map keys should be sorted before being printed. Use
+		this to have a more deterministic, diffable output.  Note that
+		only native types (bool, int, uint, floats, uintptr and string)
+		and types which implement error or Stringer interfaces are
+		supported with other types sorted according to the
+		reflect.Value.String() output which guarantees display
+		stability.  Natural map order is used by default.
+
+	* SpewKeys
+		Specifies that, as a last resort attempt, map keys should be
+		spewed to strings and sorted by those strings.  This is only
+		considered if SortKeys is true.
+
+Dump Usage
+
+Simply call spew.Dump with a list of variables you want to dump:
+
+	spew.Dump(myVar1, myVar2, ...)
+
+You may also call spew.Fdump if you would prefer to output to an arbitrary
+io.Writer.  For example, to dump to standard error:
+
+	spew.Fdump(os.Stderr, myVar1, myVar2, ...)
+
+A third option is to call spew.Sdump to get the formatted output as a string:
+
+	str := spew.Sdump(myVar1, myVar2, ...)
+
+Sample Dump Output
+
+See the Dump example for details on the setup of the types and variables being
+shown here.
+
+	(main.Foo) {
+	 unexportedField: (*main.Bar)(0xf84002e210)({
+	  flag: (main.Flag) flagTwo,
+	  data: (uintptr) <nil>
+	 }),
+	 ExportedField: (map[interface {}]interface {}) (len=1) {
+	  (string) (len=3) "one": (bool) true
+	 }
+	}
+
+Byte (and uint8) arrays and slices are displayed uniquely like the hexdump -C
+command as shown.
+	([]uint8) (len=32 cap=32) {
+	 00000000  11 12 13 14 15 16 17 18  19 1a 1b 1c 1d 1e 1f 20  |............... |
+	 00000010  21 22 23 24 25 26 27 28  29 2a 2b 2c 2d 2e 2f 30  |!"#$%&'()*+,-./0|
+	 00000020  31 32                                             |12|
+	}
+
+Custom Formatter
+
+Spew provides a custom formatter that implements the fmt.Formatter interface
+so that it integrates cleanly with standard fmt package printing functions. The
+formatter is useful for inline printing of smaller data types similar to the
+standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Custom Formatter Usage
+
+The simplest way to make use of the spew custom formatter is to call one of the
+convenience functions such as spew.Printf, spew.Println, or spew.Printf.  The
+functions have syntax you are most likely already familiar with:
+
+	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+	spew.Println(myVar, myVar2)
+	spew.Fprintf(os.Stderr, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Fprintf(os.Stderr, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+
+See the Index for the full list convenience functions.
+
+Sample Formatter Output
+
+Double pointer to a uint8:
+	  %v: <**>5
+	 %+v: <**>(0xf8400420d0->0xf8400420c8)5
+	 %#v: (**uint8)5
+	%#+v: (**uint8)(0xf8400420d0->0xf8400420c8)5
+
+Pointer to circular struct with a uint8 field and a pointer to itself:
+	  %v: <*>{1 <*><shown>}
+	 %+v: <*>(0xf84003e260){ui8:1 c:<*>(0xf84003e260)<shown>}
+	 %#v: (*main.circular){ui8:(uint8)1 c:(*main.circular)<shown>}
+	%#+v: (*main.circular)(0xf84003e260){ui8:(uint8)1 c:(*main.circular)(0xf84003e260)<shown>}
+
+See the Printf example for details on the setup of variables being shown
+here.
+
+Errors
+
+Since it is possible for custom Stringer/error interfaces to panic, spew
+detects them and handles them internally by printing the panic information
+inline with the output.  Since spew is intended to provide deep pretty printing
+capabilities on structures, it intentionally does not return any errors.
+*/
+package spew

vendor/github.com/davecgh/go-spew/spew/dump.go

@@ -0,0 +1,509 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+var (
+	// uint8Type is a reflect.Type representing a uint8.  It is used to
+	// convert cgo types to uint8 slices for hexdumping.
+	uint8Type = reflect.TypeOf(uint8(0))
+
+	// cCharRE is a regular expression that matches a cgo char.
+	// It is used to detect character arrays to hexdump them.
+	cCharRE = regexp.MustCompile(`^.*\._Ctype_char$`)
+
+	// cUnsignedCharRE is a regular expression that matches a cgo unsigned
+	// char.  It is used to detect unsigned character arrays to hexdump
+	// them.
+	cUnsignedCharRE = regexp.MustCompile(`^.*\._Ctype_unsignedchar$`)
+
+	// cUint8tCharRE is a regular expression that matches a cgo uint8_t.
+	// It is used to detect uint8_t arrays to hexdump them.
+	cUint8tCharRE = regexp.MustCompile(`^.*\._Ctype_uint8_t$`)
+)
+
+// dumpState contains information about the state of a dump operation.
+type dumpState struct {
+	w                io.Writer
+	depth            int
+	pointers         map[uintptr]int
+	ignoreNextType   bool
+	ignoreNextIndent bool
+	cs               *ConfigState
+}
+
+// indent performs indentation according to the depth level and cs.Indent
+// option.
+func (d *dumpState) indent() {
+	if d.ignoreNextIndent {
+		d.ignoreNextIndent = false
+		return
+	}
+	d.w.Write(bytes.Repeat([]byte(d.cs.Indent), d.depth))
+}
+
+// unpackValue returns values inside of non-nil interfaces when possible.
+// This is useful for data types like structs, arrays, slices, and maps which
+// can contain varying types packed inside an interface.
+func (d *dumpState) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface && !v.IsNil() {
+		v = v.Elem()
+	}
+	return v
+}
+
+// dumpPtr handles formatting of pointers by indirecting them as necessary.
+func (d *dumpState) dumpPtr(v reflect.Value) {
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range d.pointers {
+		if depth >= d.depth {
+			delete(d.pointers, k)
+		}
+	}
+
+	// Keep list of all dereferenced pointers to show later.
+	pointerChain := make([]uintptr, 0)
+
+	// Figure out how many levels of indirection there are by dereferencing
+	// pointers and unpacking interfaces down the chain while detecting circular
+	// references.
+	nilFound := false
+	cycleFound := false
+	indirects := 0
+	ve := v
+	for ve.Kind() == reflect.Ptr {
+		if ve.IsNil() {
+			nilFound = true
+			break
+		}
+		indirects++
+		addr := ve.Pointer()
+		pointerChain = append(pointerChain, addr)
+		if pd, ok := d.pointers[addr]; ok && pd < d.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		d.pointers[addr] = d.depth
+
+		ve = ve.Elem()
+		if ve.Kind() == reflect.Interface {
+			if ve.IsNil() {
+				nilFound = true
+				break
+			}
+			ve = ve.Elem()
+		}
+	}
+
+	// Display type information.
+	d.w.Write(openParenBytes)
+	d.w.Write(bytes.Repeat(asteriskBytes, indirects))
+	d.w.Write([]byte(ve.Type().String()))
+	d.w.Write(closeParenBytes)
+
+	// Display pointer information.
+	if !d.cs.DisablePointerAddresses && len(pointerChain) > 0 {
+		d.w.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				d.w.Write(pointerChainBytes)
+			}
+			printHexPtr(d.w, addr)
+		}
+		d.w.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	d.w.Write(openParenBytes)
+	switch {
+	case nilFound:
+		d.w.Write(nilAngleBytes)
+
+	case cycleFound:
+		d.w.Write(circularBytes)
+
+	default:
+		d.ignoreNextType = true
+		d.dump(ve)
+	}
+	d.w.Write(closeParenBytes)
+}
+
+// dumpSlice handles formatting of arrays and slices.  Byte (uint8 under
+// reflection) arrays and slices are dumped in hexdump -C fashion.
+func (d *dumpState) dumpSlice(v reflect.Value) {
+	// Determine whether this type should be hex dumped or not.  Also,
+	// for types which should be hexdumped, try to use the underlying data
+	// first, then fall back to trying to convert them to a uint8 slice.
+	var buf []uint8
+	doConvert := false
+	doHexDump := false
+	numEntries := v.Len()
+	if numEntries > 0 {
+		vt := v.Index(0).Type()
+		vts := vt.String()
+		switch {
+		// C types that need to be converted.
+		case cCharRE.MatchString(vts):
+			fallthrough
+		case cUnsignedCharRE.MatchString(vts):
+			fallthrough
+		case cUint8tCharRE.MatchString(vts):
+			doConvert = true
+
+		// Try to use existing uint8 slices and fall back to converting
+		// and copying if that fails.
+		case vt.Kind() == reflect.Uint8:
+			// We need an addressable interface to convert the type
+			// to a byte slice.  However, the reflect package won't
+			// give us an interface on certain things like
+			// unexported struct fields in order to enforce
+			// visibility rules.  We use unsafe, when available, to
+			// bypass these restrictions since this package does not
+			// mutate the values.
+			vs := v
+			if !vs.CanInterface() || !vs.CanAddr() {
+				vs = unsafeReflectValue(vs)
+			}
+			if !UnsafeDisabled {
+				vs = vs.Slice(0, numEntries)
+
+				// Use the existing uint8 slice if it can be
+				// type asserted.
+				iface := vs.Interface()
+				if slice, ok := iface.([]uint8); ok {
+					buf = slice
+					doHexDump = true
+					break
+				}
+			}
+
+			// The underlying data needs to be converted if it can't
+			// be type asserted to a uint8 slice.
+			doConvert = true
+		}
+
+		// Copy and convert the underlying type if needed.
+		if doConvert && vt.ConvertibleTo(uint8Type) {
+			// Convert and copy each element into a uint8 byte
+			// slice.
+			buf = make([]uint8, numEntries)
+			for i := 0; i < numEntries; i++ {
+				vv := v.Index(i)
+				buf[i] = uint8(vv.Convert(uint8Type).Uint())
+			}
+			doHexDump = true
+		}
+	}
+
+	// Hexdump the entire slice as needed.
+	if doHexDump {
+		indent := strings.Repeat(d.cs.Indent, d.depth)
+		str := indent + hex.Dump(buf)
+		str = strings.Replace(str, "\n", "\n"+indent, -1)
+		str = strings.TrimRight(str, d.cs.Indent)
+		d.w.Write([]byte(str))
+		return
+	}
+
+	// Recursively call dump for each item.
+	for i := 0; i < numEntries; i++ {
+		d.dump(d.unpackValue(v.Index(i)))
+		if i < (numEntries - 1) {
+			d.w.Write(commaNewlineBytes)
+		} else {
+			d.w.Write(newlineBytes)
+		}
+	}
+}
+
+// dump is the main workhorse for dumping a value.  It uses the passed reflect
+// value to figure out what kind of object we are dealing with and formats it
+// appropriately.  It is a recursive function, however circular data structures
+// are detected and handled properly.
+func (d *dumpState) dump(v reflect.Value) {
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		d.w.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		d.indent()
+		d.dumpPtr(v)
+		return
+	}
+
+	// Print type information unless already handled elsewhere.
+	if !d.ignoreNextType {
+		d.indent()
+		d.w.Write(openParenBytes)
+		d.w.Write([]byte(v.Type().String()))
+		d.w.Write(closeParenBytes)
+		d.w.Write(spaceBytes)
+	}
+	d.ignoreNextType = false
+
+	// Display length and capacity if the built-in len and cap functions
+	// work with the value's kind and the len/cap itself is non-zero.
+	valueLen, valueCap := 0, 0
+	switch v.Kind() {
+	case reflect.Array, reflect.Slice, reflect.Chan:
+		valueLen, valueCap = v.Len(), v.Cap()
+	case reflect.Map, reflect.String:
+		valueLen = v.Len()
+	}
+	if valueLen != 0 || !d.cs.DisableCapacities && valueCap != 0 {
+		d.w.Write(openParenBytes)
+		if valueLen != 0 {
+			d.w.Write(lenEqualsBytes)
+			printInt(d.w, int64(valueLen), 10)
+		}
+		if !d.cs.DisableCapacities && valueCap != 0 {
+			if valueLen != 0 {
+				d.w.Write(spaceBytes)
+			}
+			d.w.Write(capEqualsBytes)
+			printInt(d.w, int64(valueCap), 10)
+		}
+		d.w.Write(closeParenBytes)
+		d.w.Write(spaceBytes)
+	}
+
+	// Call Stringer/error interfaces if they exist and the handle methods flag
+	// is enabled
+	if !d.cs.DisableMethods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(d.cs, d.w, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		// Do nothing.  We should never get here since invalid has already
+		// been handled above.
+
+	case reflect.Bool:
+		printBool(d.w, v.Bool())
+
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		printInt(d.w, v.Int(), 10)
+
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		printUint(d.w, v.Uint(), 10)
+
+	case reflect.Float32:
+		printFloat(d.w, v.Float(), 32)
+
+	case reflect.Float64:
+		printFloat(d.w, v.Float(), 64)
+
+	case reflect.Complex64:
+		printComplex(d.w, v.Complex(), 32)
+
+	case reflect.Complex128:
+		printComplex(d.w, v.Complex(), 64)
+
+	case reflect.Slice:
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+
+	case reflect.Array:
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			d.dumpSlice(v)
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.String:
+		d.w.Write([]byte(strconv.Quote(v.String())))
+
+	case reflect.Interface:
+		// The only time we should get here is for nil interfaces due to
+		// unpackValue calls.
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+		}
+
+	case reflect.Ptr:
+		// Do nothing.  We should never get here since pointers have already
+		// been handled above.
+
+	case reflect.Map:
+		// nil maps should be indicated as different than empty maps
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+			break
+		}
+
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			numEntries := v.Len()
+			keys := v.MapKeys()
+			if d.cs.SortKeys {
+				sortValues(keys, d.cs)
+			}
+			for i, key := range keys {
+				d.dump(d.unpackValue(key))
+				d.w.Write(colonSpaceBytes)
+				d.ignoreNextIndent = true
+				d.dump(d.unpackValue(v.MapIndex(key)))
+				if i < (numEntries - 1) {
+					d.w.Write(commaNewlineBytes)
+				} else {
+					d.w.Write(newlineBytes)
+				}
+			}
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.Struct:
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			vt := v.Type()
+			numFields := v.NumField()
+			for i := 0; i < numFields; i++ {
+				d.indent()
+				vtf := vt.Field(i)
+				d.w.Write([]byte(vtf.Name))
+				d.w.Write(colonSpaceBytes)
+				d.ignoreNextIndent = true
+				d.dump(d.unpackValue(v.Field(i)))
+				if i < (numFields - 1) {
+					d.w.Write(commaNewlineBytes)
+				} else {
+					d.w.Write(newlineBytes)
+				}
+			}
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.Uintptr:
+		printHexPtr(d.w, uintptr(v.Uint()))
+
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		printHexPtr(d.w, v.Pointer())
+
+	// There were not any other types at the time this code was written, but
+	// fall back to letting the default fmt package handle it in case any new
+	// types are added.
+	default:
+		if v.CanInterface() {
+			fmt.Fprintf(d.w, "%v", v.Interface())
+		} else {
+			fmt.Fprintf(d.w, "%v", v.String())
+		}
+	}
+}
+
+// fdump is a helper function to consolidate the logic from the various public
+// methods which take varying writers and config states.
+func fdump(cs *ConfigState, w io.Writer, a ...interface{}) {
+	for _, arg := range a {
+		if arg == nil {
+			w.Write(interfaceBytes)
+			w.Write(spaceBytes)
+			w.Write(nilAngleBytes)
+			w.Write(newlineBytes)
+			continue
+		}
+
+		d := dumpState{w: w, cs: cs}
+		d.pointers = make(map[uintptr]int)
+		d.dump(reflect.ValueOf(arg))
+		d.w.Write(newlineBytes)
+	}
+}
+
+// Fdump formats and displays the passed arguments to io.Writer w.  It formats
+// exactly the same as Dump.
+func Fdump(w io.Writer, a ...interface{}) {
+	fdump(&Config, w, a...)
+}
+
+// Sdump returns a string with the passed arguments formatted exactly the same
+// as Dump.
+func Sdump(a ...interface{}) string {
+	var buf bytes.Buffer
+	fdump(&Config, &buf, a...)
+	return buf.String()
+}
+
+/*
+Dump displays the passed parameters to standard out with newlines, customizable
+indentation, and additional debug information such as complete types and all
+pointer addresses used to indirect to the final value.  It provides the
+following features over the built-in printing facilities provided by the fmt
+package:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output
+
+The configuration options are controlled by an exported package global,
+spew.Config.  See ConfigState for options documentation.
+
+See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
+get the formatted result as a string.
+*/
+func Dump(a ...interface{}) {
+	fdump(&Config, os.Stdout, a...)
+}

vendor/github.com/davecgh/go-spew/spew/format.go

@@ -0,0 +1,419 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// supportedFlags is a list of all the character flags supported by fmt package.
+const supportedFlags = "0-+# "
+
+// formatState implements the fmt.Formatter interface and contains information
+// about the state of a formatting operation.  The NewFormatter function can
+// be used to get a new Formatter which can be used directly as arguments
+// in standard fmt package printing calls.
+type formatState struct {
+	value          interface{}
+	fs             fmt.State
+	depth          int
+	pointers       map[uintptr]int
+	ignoreNextType bool
+	cs             *ConfigState
+}
+
+// buildDefaultFormat recreates the original format string without precision
+// and width information to pass in to fmt.Sprintf in the case of an
+// unrecognized type.  Unless new types are added to the language, this
+// function won't ever be called.
+func (f *formatState) buildDefaultFormat() (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range supportedFlags {
+		if f.fs.Flag(int(flag)) {
+			buf.WriteRune(flag)
+		}
+	}
+
+	buf.WriteRune('v')
+
+	format = buf.String()
+	return format
+}
+
+// constructOrigFormat recreates the original format string including precision
+// and width information to pass along to the standard fmt package.  This allows
+// automatic deferral of all format strings this package doesn't support.
+func (f *formatState) constructOrigFormat(verb rune) (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range supportedFlags {
+		if f.fs.Flag(int(flag)) {
+			buf.WriteRune(flag)
+		}
+	}
+
+	if width, ok := f.fs.Width(); ok {
+		buf.WriteString(strconv.Itoa(width))
+	}
+
+	if precision, ok := f.fs.Precision(); ok {
+		buf.Write(precisionBytes)
+		buf.WriteString(strconv.Itoa(precision))
+	}
+
+	buf.WriteRune(verb)
+
+	format = buf.String()
+	return format
+}
+
+// unpackValue returns values inside of non-nil interfaces when possible and
+// ensures that types for values which have been unpacked from an interface
+// are displayed when the show types flag is also set.
+// This is useful for data types like structs, arrays, slices, and maps which
+// can contain varying types packed inside an interface.
+func (f *formatState) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface {
+		f.ignoreNextType = false
+		if !v.IsNil() {
+			v = v.Elem()
+		}
+	}
+	return v
+}
+
+// formatPtr handles formatting of pointers by indirecting them as necessary.
+func (f *formatState) formatPtr(v reflect.Value) {
+	// Display nil if top level pointer is nil.
+	showTypes := f.fs.Flag('#')
+	if v.IsNil() && (!showTypes || f.ignoreNextType) {
+		f.fs.Write(nilAngleBytes)
+		return
+	}
+
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range f.pointers {
+		if depth >= f.depth {
+			delete(f.pointers, k)
+		}
+	}
+
+	// Keep list of all dereferenced pointers to possibly show later.
+	pointerChain := make([]uintptr, 0)
+
+	// Figure out how many levels of indirection there are by derferencing
+	// pointers and unpacking interfaces down the chain while detecting circular
+	// references.
+	nilFound := false
+	cycleFound := false
+	indirects := 0
+	ve := v
+	for ve.Kind() == reflect.Ptr {
+		if ve.IsNil() {
+			nilFound = true
+			break
+		}
+		indirects++
+		addr := ve.Pointer()
+		pointerChain = append(pointerChain, addr)
+		if pd, ok := f.pointers[addr]; ok && pd < f.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		f.pointers[addr] = f.depth
+
+		ve = ve.Elem()
+		if ve.Kind() == reflect.Interface {
+			if ve.IsNil() {
+				nilFound = true
+				break
+			}
+			ve = ve.Elem()
+		}
+	}
+
+	// Display type or indirection level depending on flags.
+	if showTypes && !f.ignoreNextType {
+		f.fs.Write(openParenBytes)
+		f.fs.Write(bytes.Repeat(asteriskBytes, indirects))
+		f.fs.Write([]byte(ve.Type().String()))
+		f.fs.Write(closeParenBytes)
+	} else {
+		if nilFound || cycleFound {
+			indirects += strings.Count(ve.Type().String(), "*")
+		}
+		f.fs.Write(openAngleBytes)
+		f.fs.Write([]byte(strings.Repeat("*", indirects)))
+		f.fs.Write(closeAngleBytes)
+	}
+
+	// Display pointer information depending on flags.
+	if f.fs.Flag('+') && (len(pointerChain) > 0) {
+		f.fs.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				f.fs.Write(pointerChainBytes)
+			}
+			printHexPtr(f.fs, addr)
+		}
+		f.fs.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	switch {
+	case nilFound:
+		f.fs.Write(nilAngleBytes)
+
+	case cycleFound:
+		f.fs.Write(circularShortBytes)
+
+	default:
+		f.ignoreNextType = true
+		f.format(ve)
+	}
+}
+
+// format is the main workhorse for providing the Formatter interface.  It
+// uses the passed reflect value to figure out what kind of object we are
+// dealing with and formats it appropriately.  It is a recursive function,
+// however circular data structures are detected and handled properly.
+func (f *formatState) format(v reflect.Value) {
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		f.fs.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		f.formatPtr(v)
+		return
+	}
+
+	// Print type information unless already handled elsewhere.
+	if !f.ignoreNextType && f.fs.Flag('#') {
+		f.fs.Write(openParenBytes)
+		f.fs.Write([]byte(v.Type().String()))
+		f.fs.Write(closeParenBytes)
+	}
+	f.ignoreNextType = false
+
+	// Call Stringer/error interfaces if they exist and the handle methods
+	// flag is enabled.
+	if !f.cs.DisableMethods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(f.cs, f.fs, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		// Do nothing.  We should never get here since invalid has already
+		// been handled above.
+
+	case reflect.Bool:
+		printBool(f.fs, v.Bool())
+
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		printInt(f.fs, v.Int(), 10)
+
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		printUint(f.fs, v.Uint(), 10)
+
+	case reflect.Float32:
+		printFloat(f.fs, v.Float(), 32)
+
+	case reflect.Float64:
+		printFloat(f.fs, v.Float(), 64)
+
+	case reflect.Complex64:
+		printComplex(f.fs, v.Complex(), 32)
+
+	case reflect.Complex128:
+		printComplex(f.fs, v.Complex(), 64)
+
+	case reflect.Slice:
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+
+	case reflect.Array:
+		f.fs.Write(openBracketBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			numEntries := v.Len()
+			for i := 0; i < numEntries; i++ {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				f.ignoreNextType = true
+				f.format(f.unpackValue(v.Index(i)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeBracketBytes)
+
+	case reflect.String:
+		f.fs.Write([]byte(v.String()))
+
+	case reflect.Interface:
+		// The only time we should get here is for nil interfaces due to
+		// unpackValue calls.
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+		}
+
+	case reflect.Ptr:
+		// Do nothing.  We should never get here since pointers have already
+		// been handled above.
+
+	case reflect.Map:
+		// nil maps should be indicated as different than empty maps
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+			break
+		}
+
+		f.fs.Write(openMapBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			keys := v.MapKeys()
+			if f.cs.SortKeys {
+				sortValues(keys, f.cs)
+			}
+			for i, key := range keys {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				f.ignoreNextType = true
+				f.format(f.unpackValue(key))
+				f.fs.Write(colonBytes)
+				f.ignoreNextType = true
+				f.format(f.unpackValue(v.MapIndex(key)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeMapBytes)
+
+	case reflect.Struct:
+		numFields := v.NumField()
+		f.fs.Write(openBraceBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			vt := v.Type()
+			for i := 0; i < numFields; i++ {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				vtf := vt.Field(i)
+				if f.fs.Flag('+') || f.fs.Flag('#') {
+					f.fs.Write([]byte(vtf.Name))
+					f.fs.Write(colonBytes)
+				}
+				f.format(f.unpackValue(v.Field(i)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeBraceBytes)
+
+	case reflect.Uintptr:
+		printHexPtr(f.fs, uintptr(v.Uint()))
+
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		printHexPtr(f.fs, v.Pointer())
+
+	// There were not any other types at the time this code was written, but
+	// fall back to letting the default fmt package handle it if any get added.
+	default:
+		format := f.buildDefaultFormat()
+		if v.CanInterface() {
+			fmt.Fprintf(f.fs, format, v.Interface())
+		} else {
+			fmt.Fprintf(f.fs, format, v.String())
+		}
+	}
+}
+
+// Format satisfies the fmt.Formatter interface. See NewFormatter for usage
+// details.
+func (f *formatState) Format(fs fmt.State, verb rune) {
+	f.fs = fs
+
+	// Use standard formatting for verbs that are not v.
+	if verb != 'v' {
+		format := f.constructOrigFormat(verb)
+		fmt.Fprintf(fs, format, f.value)
+		return
+	}
+
+	if f.value == nil {
+		if fs.Flag('#') {
+			fs.Write(interfaceBytes)
+		}
+		fs.Write(nilAngleBytes)
+		return
+	}
+
+	f.format(reflect.ValueOf(f.value))
+}
+
+// newFormatter is a helper function to consolidate the logic from the various
+// public methods which take varying config states.
+func newFormatter(cs *ConfigState, v interface{}) fmt.Formatter {
+	fs := &formatState{value: v, cs: cs}
+	fs.pointers = make(map[uintptr]int)
+	return fs
+}
+
+/*
+NewFormatter returns a custom formatter that satisfies the fmt.Formatter
+interface.  As a result, it integrates cleanly with standard fmt package
+printing functions.  The formatter is useful for inline printing of smaller data
+types similar to the standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Typically this function shouldn't be called directly.  It is much easier to make
+use of the custom formatter by calling one of the convenience functions such as
+Printf, Println, or Fprintf.
+*/
+func NewFormatter(v interface{}) fmt.Formatter {
+	return newFormatter(&Config, v)
+}

vendor/github.com/davecgh/go-spew/spew/spew.go

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"fmt"
+	"io"
+)
+
+// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the formatted string as a value that satisfies error.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Errorf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Errorf(format string, a ...interface{}) (err error) {
+	return fmt.Errorf(format, convertArgs(a)...)
+}
+
+// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprint(w, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprint(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprint(w, convertArgs(a)...)
+}
+
+// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintf(w, format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(w, format, convertArgs(a)...)
+}
+
+// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
+// passed with a default Formatter interface returned by NewFormatter.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintln(w, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(w, convertArgs(a)...)
+}
+
+// Print is a wrapper for fmt.Print that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Print(spew.NewFormatter(a), spew.NewFormatter(b))
+func Print(a ...interface{}) (n int, err error) {
+	return fmt.Print(convertArgs(a)...)
+}
+
+// Printf is a wrapper for fmt.Printf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Printf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Printf(format, convertArgs(a)...)
+}
+
+// Println is a wrapper for fmt.Println that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Println(spew.NewFormatter(a), spew.NewFormatter(b))
+func Println(a ...interface{}) (n int, err error) {
+	return fmt.Println(convertArgs(a)...)
+}
+
+// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprint(spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprint(a ...interface{}) string {
+	return fmt.Sprint(convertArgs(a)...)
+}
+
+// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprintf(format string, a ...interface{}) string {
+	return fmt.Sprintf(format, convertArgs(a)...)
+}
+
+// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
+// were passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintln(spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprintln(a ...interface{}) string {
+	return fmt.Sprintln(convertArgs(a)...)
+}
+
+// convertArgs accepts a slice of arguments and returns a slice of the same
+// length with each argument converted to a default spew Formatter interface.
+func convertArgs(args []interface{}) (formatters []interface{}) {
+	formatters = make([]interface{}, len(args))
+	for index, arg := range args {
+		formatters[index] = NewFormatter(arg)
+	}
+	return formatters
+}

vendor/github.com/google/uuid/CHANGELOG.md

@@ -0,0 +1,41 @@
+# Changelog
+
+## [1.6.0](https://github.com/google/uuid/compare/v1.5.0...v1.6.0) (2024-01-16)
+
+
+### Features
+
+* add Max UUID constant ([#149](https://github.com/google/uuid/issues/149)) ([c58770e](https://github.com/google/uuid/commit/c58770eb495f55fe2ced6284f93c5158a62e53e3))
+
+
+### Bug Fixes
+
+* fix typo in version 7 uuid documentation ([#153](https://github.com/google/uuid/issues/153)) ([016b199](https://github.com/google/uuid/commit/016b199544692f745ffc8867b914129ecb47ef06))
+* Monotonicity in UUIDv7 ([#150](https://github.com/google/uuid/issues/150)) ([a2b2b32](https://github.com/google/uuid/commit/a2b2b32373ff0b1a312b7fdf6d38a977099698a6))
+
+## [1.5.0](https://github.com/google/uuid/compare/v1.4.0...v1.5.0) (2023-12-12)
+
+
+### Features
+
+* Validate UUID without creating new UUID ([#141](https://github.com/google/uuid/issues/141)) ([9ee7366](https://github.com/google/uuid/commit/9ee7366e66c9ad96bab89139418a713dc584ae29))
+
+## [1.4.0](https://github.com/google/uuid/compare/v1.3.1...v1.4.0) (2023-10-26)
+
+
+### Features
+
+* UUIDs slice type with Strings() convenience method ([#133](https://github.com/google/uuid/issues/133)) ([cd5fbbd](https://github.com/google/uuid/commit/cd5fbbdd02f3e3467ac18940e07e062be1f864b4))
+
+### Fixes
+
+* Clarify that Parse's job is to parse but not necessarily validate strings. (Documents current behavior)
+
+## [1.3.1](https://github.com/google/uuid/compare/v1.3.0...v1.3.1) (2023-08-18)
+
+
+### Bug Fixes
+
+* Use .EqualFold() to parse urn prefixed UUIDs ([#118](https://github.com/google/uuid/issues/118)) ([574e687](https://github.com/google/uuid/commit/574e6874943741fb99d41764c705173ada5293f0))
+
+## Changelog

vendor/github.com/google/uuid/CONTRIBUTING.md

@@ -0,0 +1,26 @@
+# How to contribute
+
+We definitely welcome patches and contribution to this project!
+
+### Tips
+
+Commits must be formatted according to the [Conventional Commits Specification](https://www.conventionalcommits.org).
+
+Always try to include a test case! If it is not possible or not necessary,
+please explain why in the pull request description.
+
+### Releasing
+
+Commits that would precipitate a SemVer change, as described in the Conventional
+Commits Specification, will trigger [`release-please`](https://github.com/google-github-actions/release-please-action)
+to create a release candidate pull request. Once submitted, `release-please`
+will create a release.
+
+For tips on how to work with `release-please`, see its documentation.
+
+### Legal requirements
+
+In order to protect both you and ourselves, you will need to sign the
+[Contributor License Agreement](https://cla.developers.google.com/clas).
+
+You may have already signed it for other Google projects.

vendor/github.com/google/uuid/CONTRIBUTORS

@@ -0,0 +1,9 @@
+Paul Borman <borman@google.com>
+bmatsuo
+shawnps
+theory
+jboverfelt
+dsymonds
+cd1
+wallclockbuilder
+dansouza

vendor/github.com/google/uuid/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009,2014 Google Inc. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/google/uuid/README.md

@@ -0,0 +1,21 @@
+# uuid
+The uuid package generates and inspects UUIDs based on
+[RFC 4122](https://datatracker.ietf.org/doc/html/rfc4122)
+and DCE 1.1: Authentication and Security Services. 
+
+This package is based on the github.com/pborman/uuid package (previously named
+code.google.com/p/go-uuid).  It differs from these earlier packages in that
+a UUID is a 16 byte array rather than a byte slice.  One loss due to this
+change is the ability to represent an invalid UUID (vs a NIL UUID).
+
+###### Install
+```sh
+go get github.com/google/uuid
+```
+
+###### Documentation 
+[![Go Reference](https://pkg.go.dev/badge/github.com/google/uuid.svg)](https://pkg.go.dev/github.com/google/uuid)
+
+Full `go doc` style documentation for the package can be viewed online without
+installing this package by using the GoDoc site here: 
+http://pkg.go.dev/github.com/google/uuid

vendor/github.com/google/uuid/dce.go

@@ -0,0 +1,80 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"encoding/binary"
+	"fmt"
+	"os"
+)
+
+// A Domain represents a Version 2 domain
+type Domain byte
+
+// Domain constants for DCE Security (Version 2) UUIDs.
+const (
+	Person = Domain(0)
+	Group  = Domain(1)
+	Org    = Domain(2)
+)
+
+// NewDCESecurity returns a DCE Security (Version 2) UUID.
+//
+// The domain should be one of Person, Group or Org.
+// On a POSIX system the id should be the users UID for the Person
+// domain and the users GID for the Group.  The meaning of id for
+// the domain Org or on non-POSIX systems is site defined.
+//
+// For a given domain/id pair the same token may be returned for up to
+// 7 minutes and 10 seconds.
+func NewDCESecurity(domain Domain, id uint32) (UUID, error) {
+	uuid, err := NewUUID()
+	if err == nil {
+		uuid[6] = (uuid[6] & 0x0f) | 0x20 // Version 2
+		uuid[9] = byte(domain)
+		binary.BigEndian.PutUint32(uuid[0:], id)
+	}
+	return uuid, err
+}
+
+// NewDCEPerson returns a DCE Security (Version 2) UUID in the person
+// domain with the id returned by os.Getuid.
+//
+//  NewDCESecurity(Person, uint32(os.Getuid()))
+func NewDCEPerson() (UUID, error) {
+	return NewDCESecurity(Person, uint32(os.Getuid()))
+}
+
+// NewDCEGroup returns a DCE Security (Version 2) UUID in the group
+// domain with the id returned by os.Getgid.
+//
+//  NewDCESecurity(Group, uint32(os.Getgid()))
+func NewDCEGroup() (UUID, error) {
+	return NewDCESecurity(Group, uint32(os.Getgid()))
+}
+
+// Domain returns the domain for a Version 2 UUID.  Domains are only defined
+// for Version 2 UUIDs.
+func (uuid UUID) Domain() Domain {
+	return Domain(uuid[9])
+}
+
+// ID returns the id for a Version 2 UUID. IDs are only defined for Version 2
+// UUIDs.
+func (uuid UUID) ID() uint32 {
+	return binary.BigEndian.Uint32(uuid[0:4])
+}
+
+func (d Domain) String() string {
+	switch d {
+	case Person:
+		return "Person"
+	case Group:
+		return "Group"
+	case Org:
+		return "Org"
+	}
+	return fmt.Sprintf("Domain%d", int(d))
+}

vendor/github.com/google/uuid/doc.go

@@ -0,0 +1,12 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package uuid generates and inspects UUIDs.
+//
+// UUIDs are based on RFC 4122 and DCE 1.1: Authentication and Security
+// Services.
+//
+// A UUID is a 16 byte (128 bit) array.  UUIDs may be used as keys to
+// maps or compared directly.
+package uuid

vendor/github.com/google/uuid/hash.go

@@ -0,0 +1,59 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"crypto/md5"
+	"crypto/sha1"
+	"hash"
+)
+
+// Well known namespace IDs and UUIDs
+var (
+	NameSpaceDNS  = Must(Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceURL  = Must(Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceOID  = Must(Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceX500 = Must(Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8"))
+	Nil           UUID // empty UUID, all zeros
+
+	// The Max UUID is special form of UUID that is specified to have all 128 bits set to 1.
+	Max = UUID{
+		0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+		0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	}
+)
+
+// NewHash returns a new UUID derived from the hash of space concatenated with
+// data generated by h.  The hash should be at least 16 byte in length.  The
+// first 16 bytes of the hash are used to form the UUID.  The version of the
+// UUID will be the lower 4 bits of version.  NewHash is used to implement
+// NewMD5 and NewSHA1.
+func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID {
+	h.Reset()
+	h.Write(space[:]) //nolint:errcheck
+	h.Write(data)     //nolint:errcheck
+	s := h.Sum(nil)
+	var uuid UUID
+	copy(uuid[:], s)
+	uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4)
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant
+	return uuid
+}
+
+// NewMD5 returns a new MD5 (Version 3) UUID based on the
+// supplied name space and data.  It is the same as calling:
+//
+//  NewHash(md5.New(), space, data, 3)
+func NewMD5(space UUID, data []byte) UUID {
+	return NewHash(md5.New(), space, data, 3)
+}
+
+// NewSHA1 returns a new SHA1 (Version 5) UUID based on the
+// supplied name space and data.  It is the same as calling:
+//
+//  NewHash(sha1.New(), space, data, 5)
+func NewSHA1(space UUID, data []byte) UUID {
+	return NewHash(sha1.New(), space, data, 5)
+}

vendor/github.com/google/uuid/marshal.go

@@ -0,0 +1,38 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import "fmt"
+
+// MarshalText implements encoding.TextMarshaler.
+func (uuid UUID) MarshalText() ([]byte, error) {
+	var js [36]byte
+	encodeHex(js[:], uuid)
+	return js[:], nil
+}
+
+// UnmarshalText implements encoding.TextUnmarshaler.
+func (uuid *UUID) UnmarshalText(data []byte) error {
+	id, err := ParseBytes(data)
+	if err != nil {
+		return err
+	}
+	*uuid = id
+	return nil
+}
+
+// MarshalBinary implements encoding.BinaryMarshaler.
+func (uuid UUID) MarshalBinary() ([]byte, error) {
+	return uuid[:], nil
+}
+
+// UnmarshalBinary implements encoding.BinaryUnmarshaler.
+func (uuid *UUID) UnmarshalBinary(data []byte) error {
+	if len(data) != 16 {
+		return fmt.Errorf("invalid UUID (got %d bytes)", len(data))
+	}
+	copy(uuid[:], data)
+	return nil
+}

vendor/github.com/google/uuid/node.go

@@ -0,0 +1,90 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"sync"
+)
+
+var (
+	nodeMu sync.Mutex
+	ifname string  // name of interface being used
+	nodeID [6]byte // hardware for version 1 UUIDs
+	zeroID [6]byte // nodeID with only 0's
+)
+
+// NodeInterface returns the name of the interface from which the NodeID was
+// derived.  The interface "user" is returned if the NodeID was set by
+// SetNodeID.
+func NodeInterface() string {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	return ifname
+}
+
+// SetNodeInterface selects the hardware address to be used for Version 1 UUIDs.
+// If name is "" then the first usable interface found will be used or a random
+// Node ID will be generated.  If a named interface cannot be found then false
+// is returned.
+//
+// SetNodeInterface never fails when name is "".
+func SetNodeInterface(name string) bool {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	return setNodeInterface(name)
+}
+
+func setNodeInterface(name string) bool {
+	iname, addr := getHardwareInterface(name) // null implementation for js
+	if iname != "" && addr != nil {
+		ifname = iname
+		copy(nodeID[:], addr)
+		return true
+	}
+
+	// We found no interfaces with a valid hardware address.  If name
+	// does not specify a specific interface generate a random Node ID
+	// (section 4.1.6)
+	if name == "" {
+		ifname = "random"
+		randomBits(nodeID[:])
+		return true
+	}
+	return false
+}
+
+// NodeID returns a slice of a copy of the current Node ID, setting the Node ID
+// if not already set.
+func NodeID() []byte {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	if nodeID == zeroID {
+		setNodeInterface("")
+	}
+	nid := nodeID
+	return nid[:]
+}
+
+// SetNodeID sets the Node ID to be used for Version 1 UUIDs.  The first 6 bytes
+// of id are used.  If id is less than 6 bytes then false is returned and the
+// Node ID is not set.
+func SetNodeID(id []byte) bool {
+	if len(id) < 6 {
+		return false
+	}
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	copy(nodeID[:], id)
+	ifname = "user"
+	return true
+}
+
+// NodeID returns the 6 byte node id encoded in uuid.  It returns nil if uuid is
+// not valid.  The NodeID is only well defined for version 1 and 2 UUIDs.
+func (uuid UUID) NodeID() []byte {
+	var node [6]byte
+	copy(node[:], uuid[10:])
+	return node[:]
+}

vendor/github.com/google/uuid/node_js.go

@@ -0,0 +1,12 @@
+// Copyright 2017 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build js
+
+package uuid
+
+// getHardwareInterface returns nil values for the JS version of the code.
+// This removes the "net" dependency, because it is not used in the browser.
+// Using the "net" library inflates the size of the transpiled JS code by 673k bytes.
+func getHardwareInterface(name string) (string, []byte) { return "", nil }

vendor/github.com/google/uuid/node_net.go

@@ -0,0 +1,33 @@
+// Copyright 2017 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !js
+
+package uuid
+
+import "net"
+
+var interfaces []net.Interface // cached list of interfaces
+
+// getHardwareInterface returns the name and hardware address of interface name.
+// If name is "" then the name and hardware address of one of the system's
+// interfaces is returned.  If no interfaces are found (name does not exist or
+// there are no interfaces) then "", nil is returned.
+//
+// Only addresses of at least 6 bytes are returned.
+func getHardwareInterface(name string) (string, []byte) {
+	if interfaces == nil {
+		var err error
+		interfaces, err = net.Interfaces()
+		if err != nil {
+			return "", nil
+		}
+	}
+	for _, ifs := range interfaces {
+		if len(ifs.HardwareAddr) >= 6 && (name == "" || name == ifs.Name) {
+			return ifs.Name, ifs.HardwareAddr
+		}
+	}
+	return "", nil
+}