package watcher

import (
    "log"
    "github.com/fsnotify/fsnotify"
)

type FileHandler func(path string)

func WatchDirs(dirs []string, handler FileHandler) error {
    watcher, err := fsnotify.NewWatcher()
    if err != nil {
        return err
    }
    defer watcher.Close()

    for _, d := range dirs {
        if err := watcher.Add(d); err != nil {
            return err
        }
    }

    for {
        select {
        case event := <-watcher.Events:
            if event.Op&(fsnotify.Create|fsnotify.Write) != 0 {
                handler(event.Name)
            }

        case err := <-watcher.Errors:
            log.Printf("Watcher error: %v\n", err)
        }
    }
}