fix: create file protobuf content

gobuf.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"path/filepath"
 
 	"github.com/emicklei/proto"
 	"gitter.top/sync/proto-contrib/pkg/protofmt"
@@ -35,6 +36,31 @@ func NewParser(file string) (*Parser, error) {
 	}, nil
 }
 
+func CreateFile(filename string) error {
+	// 检查文件是否存在
+	if _, err := os.Stat(filename); err == nil {
+		return nil
+	} else if !os.IsNotExist(err) {
+		return err
+	}
+
+	// 确保文件所在的目录存在
+	baseDir := filepath.Dir(filename)
+	if baseDir != "." && baseDir != ".." {
+		if err := os.MkdirAll(baseDir, os.ModePerm); err != nil {
+			return err
+		}
+	}
+
+	// 写入基础的protobuf内容，此步骤会创建文件
+	baseContent := []byte("syntax = \"proto3\";\n\npackage proto.v1;\n\noption go_package = \"projects/gen;genv1\";\n")
+	if err := os.WriteFile(filename, baseContent, os.ModePerm); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func (parser *Parser) ExistService(serviceName string) bool {
 	var result bool
 	proto.Walk(parser.proto, proto.WithService(func(service *proto.Service) {