Go语言自动生成Proto文件

package main
//go get github.com/fsnotify/fsnotify
import (
	"fmt"
	"github.com/fsnotify/fsnotify"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)
var dir="D:\\GoProgram\\SelfGame\\Proto"
var goOupDir = "D:\\GoProgram\\SelfGame\\Proto"
var  csharpOutDir="D:\\UintyProgram\\SelfGame\\SelfGame\\Assets\\Proto"
func main() {
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		fmt.Println(err)
	}

	filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
		if !info.IsDir() {
			if strings.Contains(info.Name(),".proto") {

				fmt.Println(path)
				err := watcher.Add(path)
				if err != nil {
					fmt.Println(err)
				}

			}
		}
		return  err
	})
	Start(watcher)
}

func Start(watcher *fsnotify.Watcher)  {
	for  {
		select {
				case event:=<-watcher.Events:

					if (event.Op&fsnotify.Write==fsnotify.Write) {
						update(event.Name)
						file, err := os.Open(event.Name)
						if err != nil {
							fmt.Println("文件打开失败",err)
							fmt.Println(file)
						}
						fmt.Println(event.Name)
						fmt.Println("文件被修改了")
					}
				case err:=<-watcher.Errors:
					if err != nil {
						fmt.Println(err)
						return
					}

		}
	}
}

func update(name string)  {
	fmt.Println(dir)
	cmd := exec.Command("protoc", "-I="+dir,"--go_out="+goOupDir, name)

	cmd2 := exec.Command("protoc","-I="+dir,"--csharp_out="+csharpOutDir,name)
	bytes,err:=cmd.CombinedOutput();
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(string(bytes))
	bytes,err=cmd2.CombinedOutput();
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(string(bytes))
}