remove duplicated code in goctl (#369)

tools/goctl/api/gogen/genmiddleware.go

@@ -1,12 +1,9 @@
 package gogen
 
 import (
-	"bytes"
 	"strings"
-	"text/template"
 
 	"github.com/tal-tech/go-zero/tools/goctl/api/spec"
-	"github.com/tal-tech/go-zero/tools/goctl/api/util"
 	"github.com/tal-tech/go-zero/tools/goctl/config"
 	"github.com/tal-tech/go-zero/tools/goctl/util/format"
 )
@@ -37,36 +34,26 @@ func genMiddleware(dir string, cfg *config.Config, api *spec.ApiSpec) error {
 	var middlewares = getMiddleware(api)
 	for _, item := range middlewares {
 		middlewareFilename := strings.TrimSuffix(strings.ToLower(item), "middleware") + "_middleware"
-		formatName, err := format.FileNamingFormat(cfg.NamingFormat, middlewareFilename)
+		filename, err := format.FileNamingFormat(cfg.NamingFormat, middlewareFilename)
 		if err != nil {
 			return err
 		}
 
-		filename := formatName + ".go"
-		fp, created, err := util.MaybeCreateFile(dir, middlewareDir, filename)
-		if err != nil {
-			return err
-		}
-		if !created {
-			continue
-		}
-		defer fp.Close()
-
 		name := strings.TrimSuffix(item, "Middleware") + "Middleware"
-		t := template.Must(template.New("contextTemplate").Parse(middlewareImplementCode))
-		buffer := new(bytes.Buffer)
-		err = t.Execute(buffer, map[string]string{
-			"name": strings.Title(name),
+		err = genFile(fileGenConfig{
+			dir:             dir,
+			subdir:          middlewareDir,
+			filename:        filename + ".go",
+			templateName:    "contextTemplate",
+			builtinTemplate: middlewareImplementCode,
+			data: map[string]string{
+				"name": strings.Title(name),
+			},
 		})
 		if err != nil {
 			return err
 		}
-
-		formatCode := formatCode(buffer.String())
-		_, err = fp.WriteString(formatCode)
-		if err != nil {
-			return err
-		}
 	}
+
 	return nil
 }