Watching A Directory For Changes

This is a very simple VALA script that watches a directory for changes (not including sub-directories) then prints out the changed files.

Usage: changewatch /path/to/folder/to/watch

/**
 * Watches a directory for changes:
 * 
 * compile: valac changeWatch.vala --pkg gio-2.0
 * Copyright 2011-12-09 Joseph Lewis
 * Apache License
 */

using GLib;

void on_change (File f) {
    print(f.get_path() + "\n");
}

void main (string[] argv) {
    
    if(argv[1] == null)
    {
        print("Usage: "+argv[0]+" /path/to/file/to/watch\n");
        return;
    }
    
    GLib.File fp = File.new_for_path(argv[1]);
 
    GLib.FileMonitor mon1;
 
    try {
        mon1 = fp.monitor_directory(
            GLib.FileMonitorFlags.NONE
        );
        mon1.changed.connect(on_change);
        print("Monitoring: "+fp.get_path()+"\n");
    } catch (GLib.Error e) {
        print("Error: "+e.message+"\n");
    }
    GLib.MainLoop loop = new GLib.MainLoop();
    loop.run();
}