shitty_tripwire.go

package main

import (
    "flag"
    "log"
    "os"
    "path/filepath"

    "github.com/go-fsnotify/fsnotify"
)

func addRecursive(filename string, watcher *fsnotify.Watcher) {
    filepath.Walk(filename, func(path string, info os.FileInfo, err error) error {
        if err != nil || !info.IsDir() {
            return nil
        }

        err = watcher.Add(path)
        if err != nil {
            log.Printf("Error watching %s: %s", path, err)
            return nil
        }

        log.Println("Watching:", path)
        return nil
    })
}

func main() {
    dir := flag.String("dir", ".", "Directory to watch!")
    flag.Parse()

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

    addRecursive(*dir, watcher)

    for {
        select {
        case err := <-watcher.Errors:
            log.Println("Error:", err)
        case event := <-watcher.Events:
            log.Println(event)
            if event.Op&fsnotify.Create == fsnotify.Create {
                addRecursive(event.Name, watcher)
            }
        }
    }
}