fix segfault on non-existent directories

Author: Enapiuz

main.go

@@ -27,14 +27,11 @@ func main() {
 		log.Fatal(err)
 	}
 	for _, watchConfig := range config.Watch {
-		log.Printf("%v", watchConfig)
 		dirWatcher := watcher.NewWatcher(watchConfig.Name, watchConfig.Paths, watchConfig.Commands)
 		dirWatcher.Run(needReprint)
 		watchers = append(watchers, dirWatcher)
 	}
 
-	log.Printf("%d", len(watchers))
-
 	var statusPrinter = printer.NewPrinter()
 	statusPrinter.RegisterWatchers(watchers)
 	statusPrinter.Start(needReprint)

watcher/watcher.go

@@ -21,15 +21,17 @@ type Watcher struct {
 func NewWatcher(name string, dirs []string, commands []string) *Watcher {
 	watcher, _ := fsnotify.NewWatcher()
 	for _, dir := range dirs {
+		if _, err := os.Stat(dir); os.IsNotExist(err) {
+			log.Fatalf("Directory '%s' in '%s' watcher does not exists", dir, name)
+		}
 		if err := filepath.Walk(dir, watchDir(watcher)); err != nil {
-			fmt.Println("ERROR", err)
+			log.Fatal("ERROR", err)
 		}
 	}
 	return &Watcher{watcher: watcher, commands: commands, name: name, status: "⚪"}
 }
 
 func (w *Watcher) Run(needReprint chan bool) {
-	log.Printf("watcher %s has been started", w.name)
 	go func() {
 		f := func() {
 			w.status = "🔄"