package main import ( "fmt" "github.com/howeyc/fsnotify" "os" "os/exec" "strings" "sync" "time" ) var ( cmd *exec.Cmd state sync.Mutex eventTime = make(map[string]int64) ) func NewWatcher(paths []string) { watcher, err := fsnotify.NewWatcher() if err != nil { colorLog("[ERRO] Fail to create new Watcher[ %s ]\n", err) os.Exit(2) } go func() { for { select { case e := <-watcher.Event: isbuild := true // Skip TMP files for Sublime Text. if checkTMPFile(e.Name) { continue } if !checkIsGoFile(e.Name) { continue } mt := getFileModTime(e.Name) if t := eventTime[e.Name]; mt == t { colorLog("[SKIP] # %s #\n", e.String()) isbuild = false } eventTime[e.Name] = mt if isbuild { colorLog("[EVEN] %s\n", e) go Autobuild() } case err := <-watcher.Error: colorLog("[WARN] %s\n", err.Error()) // No need to exit here } } }() colorLog("[INFO] Initializing watcher...\n") for _, path := range paths { colorLog("[TRAC] Directory( %s )\n", path) err = watcher.Watch(path) if err != nil { colorLog("[ERRO] Fail to watch directory[ %s ]\n", err) os.Exit(2) } } } // getFileModTime retuens unix timestamp of `os.File.ModTime` by given path. func getFileModTime(path string) int64 { f, err := os.Open(path) if err != nil { colorLog("[ERRO] Fail to open file[ %s ]", err) return time.Now().Unix() } defer f.Close() fi, err := f.Stat() if err != nil { colorLog("[ERRO] Fail to get file information[ %s ]", err) return time.Now().Unix() } return fi.ModTime().Unix() } func Autobuild() { state.Lock() defer state.Unlock() colorLog("[INFO] Start building...\n") path, _ := os.Getwd() os.Chdir(path) var err error // For applications use full import path like "github.com/.../.." // are able to use "go install" to reduce build time. if conf.GoInstall { icmd := exec.Command("go", "install") icmd.Stdout = os.Stdout icmd.Stderr = os.Stderr err = icmd.Run() } if err == nil { bcmd := exec.Command("go", "build") bcmd.Stdout = os.Stdout bcmd.Stderr = os.Stderr err = bcmd.Run() } if err != nil { colorLog("[ERRO] ============== Build failed ===================\n") return } colorLog("[SUCC] Build was successful\n") Restart(appname) } func Kill() { defer func() { if e := recover(); e != nil { fmt.Println("Kill -> ", e) } }() if cmd != nil && cmd.Process != nil { cmd.Process.Kill() } } func Restart(appname string) { Debugf("kill running process") Kill() go Start(appname) } func Start(appname string) { colorLog("[INFO] Restarting %s ...\n", appname) if strings.Index(appname, "./") == -1 { appname = "./" + appname } cmd = exec.Command(appname) cmd.Stdout = os.Stdout cmd.Stderr = os.Stderr go cmd.Run() started <- true } // checkTMPFile returns true if the event was for TMP files. func checkTMPFile(name string) bool { if strings.HasSuffix(strings.ToLower(name), ".tmp") { return true } return false } // checkIsGoFile returns true if the name HasSuffix ".go". func checkIsGoFile(name string) bool { if strings.HasSuffix(name, ".go") { return true } return false }