fsnotify

package main

import (
	"fmt"

	"gopkg.in/fsnotify.v1"
)

// main
func main() {

	// creates a new file watcher
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		fmt.Println("ERROR", err)
	}
	defer watcher.Close()
	done := make(chan bool)
	suraj := make(chan bool)

	//
	go func() {
		for {
			select {
			// watch for events
			case event := <-watcher.Events:
				fmt.Printf("EVENT! %#v, WRITE: %#v, RENAME: %#v\n", event, event.Op&fsnotify.Write == fsnotify.Write, event.Op&fsnotify.Rename == fsnotify.Rename)
				if event.Op&fsnotify.Write == fsnotify.Write {
					suraj <- true
				}
				// watch for errors
			case err := <-watcher.Errors:
				fmt.Println("ERROR", err)
			}
		}
	}()

	go func() {
		for {

			if <-suraj {
				fmt.Println("FILE CHANGED")
			}
		}
	}()
	// out of the box fsnotify can watch a single file, or a single directory
	if err := watcher.Add("/home/suraj/fsnotify-1/certs"); err != nil {
		fmt.Println("ERROR", err)
	}
	<-done
}