Added go text template writier (#1)

feat(templ): ✨ added templ to command line that reads go template and outputs code

Reviewed-on: #1
Co-authored-by: Hein <hein.puth@gmail.com>
Co-committed-by: Hein <hein.puth@gmail.com>

pkg/commontypes/golang.go

@@ -0,0 +1,89 @@
+package commontypes
+
+import "strings"
+
+// GoTypeMap maps PostgreSQL types to Go types
+var GoTypeMap = map[string]string{
+	// Integer types
+	"integer":     "int32",
+	"int":         "int32",
+	"int4":        "int32",
+	"smallint":    "int16",
+	"int2":        "int16",
+	"bigint":      "int64",
+	"int8":        "int64",
+	"serial":      "int32",
+	"bigserial":   "int64",
+	"smallserial": "int16",
+
+	// String types
+	"text":      "string",
+	"varchar":   "string",
+	"char":      "string",
+	"character": "string",
+	"citext":    "string",
+	"bpchar":    "string",
+
+	// Boolean
+	"boolean": "bool",
+	"bool":    "bool",
+
+	// Float types
+	"real":             "float32",
+	"float4":           "float32",
+	"double precision": "float64",
+	"float8":           "float64",
+	"numeric":          "float64",
+	"decimal":          "float64",
+
+	// Date/Time types
+	"timestamp":                   "time.Time",
+	"timestamp without time zone": "time.Time",
+	"timestamp with time zone":    "time.Time",
+	"timestamptz":                 "time.Time",
+	"date":                        "time.Time",
+	"time":                        "time.Time",
+	"time without time zone":      "time.Time",
+	"time with time zone":         "time.Time",
+	"timetz":                      "time.Time",
+
+	// Binary
+	"bytea": "[]byte",
+
+	// UUID
+	"uuid": "string",
+
+	// JSON
+	"json":  "string",
+	"jsonb": "string",
+
+	// Array
+	"array": "[]string",
+}
+
+// SQLToGo converts SQL types to Go types
+func SQLToGo(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	goType, ok := GoTypeMap[baseType]
+	if !ok {
+		goType = "interface{}"
+	}
+
+	// Handle nullable types
+	if nullable {
+		return goType
+	}
+
+	// For nullable, use pointer types (except for slices and interfaces)
+	if !strings.HasPrefix(goType, "[]") && goType != "interface{}" {
+		return "*" + goType
+	}
+
+	return goType
+}
+
+// NeedsTimeImport checks if a Go type requires the time package
+func NeedsTimeImport(goType string) bool {
+	return strings.Contains(goType, "time.Time")
+}