// WatchDirectoryChanges watches a directory and fires the callback with the changed name, receives a logger just to print with red letters any errors, no need for second callback.
func WatchDirectoryChanges(rootPath string, evt func(filename string), logger *logger.Logger) {
isWindows := runtime.GOOS == "windows"
watcher, werr := fsnotify.NewWatcher()
if werr != nil {
logger.Dangerf(werr.Error())
return
}
go func() {
var lastChange = time.Now()
var i = 0
for {
select {
case event := <-watcher.Events:
if event.Op&fsnotify.Write == fsnotify.Write {
//this is received two times, the last time is the real changed file, so
i++
if i%2 == 0 || !isWindows { // this 'hack' works for windows but I dont know if works for linux too, we can wait for issue reports here.
if time.Now().After(lastChange.Add(time.Duration(1) * time.Second)) {
lastChange = time.Now()
evt(event.Name)
}
}
}
case err := <-watcher.Errors:
logger.Dangerf(err.Error())
}
}
}()
werr = watcher.Add(rootPath)
if werr != nil {
logger.Dangerf(werr.Error())
}
}
