feat: initial plan

cmd/pgtidy/main.go

@@ -0,0 +1,52 @@
+// Command pgtidy is the PgTidy CLI: a PostgreSQL formatter (and, later, linter)
+// and LSP server. Today it provides the `fmt` subcommand.
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+// version is overridden at build time via -ldflags "-X main.version=...".
+var version = "dev"
+
+func main() {
+	os.Exit(run(os.Args[1:], os.Stdin, os.Stdout, os.Stderr))
+}
+
+func run(args []string, stdin io.Reader, stdout, stderr io.Writer) int {
+	if len(args) == 0 {
+		usage(stderr)
+		return 2
+	}
+	switch args[0] {
+	case "fmt", "format":
+		return cmdFmt(args[1:], stdin, stdout, stderr)
+	case "version", "--version", "-v":
+		fmt.Fprintf(stdout, "pgtidy %s\n", version)
+		return 0
+	case "help", "-h", "--help":
+		usage(stdout)
+		return 0
+	default:
+		fmt.Fprintf(stderr, "pgtidy: unknown command %q\n", args[0])
+		usage(stderr)
+		return 2
+	}
+}
+
+func usage(w io.Writer) {
+	fmt.Fprint(w, `pgtidy — PostgreSQL formatter and linter
+
+Usage:
+  pgtidy fmt [flags] [files...]   Format SQL/PL-pgSQL (stdin if no files)
+  pgtidy version                  Print version
+  pgtidy help                     Show this help
+
+fmt flags:
+  -w, --write    Rewrite files in place
+  -l, --list     List files whose formatting differs (no writes)
+      --check    Exit non-zero if any input is not already formatted (CI)
+`)
+}