tons of code

kitcom/gogen.go

@@ -1,9 +1,49 @@
 package main
 
+import (
+	"errors"
+	"fmt"
+	"html/template"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
 type GoApiGenerator struct {
 }
 
+var tpl = template.Must(template.New("gotpl").Parse(strings.TrimSpace(`
+
+
+
+`)))
+
 func (g *GoApiGenerator) Generate(api *Api, destFile string) error {
-	//TODO implement me
-	panic("implement me")
+	destFileBak := filepath.Join(destFile, ".bak")
+	_, err := os.Stat(destFile)
+	if err != nil && !errors.Is(err, os.ErrNotExist) {
+		return fmt.Errorf("stat destination file: %w", err)
+	}
+	if !errors.Is(err, os.ErrNotExist) {
+		if err := os.Rename(destFile, destFileBak); err != nil {
+			return fmt.Errorf("backup destination file: %w", err)
+		}
+	}
+
+	f, err := os.OpenFile(destFile, os.O_WRONLY|os.O_CREATE, 0644)
+	if err != nil {
+		return fmt.Errorf("open destination file: %w", err)
+	}
+	defer f.Close()
+
+	if err := tpl.Execute(f, api); err != nil {
+		return fmt.Errorf("execute template: %w", err)
+	}
+
+	if _, err := os.Stat(destFileBak); err == nil {
+		if err := os.Remove(destFileBak); err != nil {
+			return fmt.Errorf("remove backup file: %w", err)
+		}
+	}
+	return nil
 }