// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build !plan9

package main

import (
	"flag"
	"log"

	"github.com/fsnotify/fsnotify"
)

/*
29044  2016-09-21 12:40:21 cd x
29045  2016-09-21 12:40:25 touch file
29046  2016-09-21 12:40:39 rm file
29047  2016-09-21 12:40:42 touch file
29048  2016-09-21 12:40:50 echo farts > file
29049  2016-09-21 12:40:57 rm file

produces:
$ ./sync_pass x
2016/09/21 12:40:25 event: "x/file": CREATE
2016/09/21 12:40:25 event: "x/file": CHMOD
2016/09/21 12:40:39 event: "x/file": REMOVE
2016/09/21 12:40:42 event: "x/file": CREATE
2016/09/21 12:40:42 event: "x/file": CHMOD
2016/09/21 12:40:50 event: "x/file": WRITE
2016/09/21 12:40:50 modified file: x/file
2016/09/21 12:40:50 event: "x/file": WRITE
2016/09/21 12:40:50 modified file: x/file
2016/09/21 12:40:57 event: "x/file": REMOVE
*/
func main() {
	flag.Parse()

	for _, arg := range flag.Args() {
		WathPath(arg)
	}
}

func WathPath(path string) {
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		log.Fatal(err)
	}
	defer watcher.Close()

	done := make(chan bool)
	go func() {
		for {
			select {
			case event := <-watcher.Events:
				log.Println("event:", event)
				if event.Op&fsnotify.Write == fsnotify.Write {
					log.Println("modified file:", event.Name)
				}
			case err := <-watcher.Errors:
				log.Println("error:", err)
			}
		}
	}()

	err = watcher.Add(path)
	if err != nil {
		log.Fatal(err)
	}
	<-done
}