AutoBackup.wsh

// TARGET.pid のファイルを削除で終了
if ( WScript.Count == 0 ) {
	WScript.Echo("対象ファイルをD&Dしてください");
	WScript.Quit();
}
var TARGET = WScript.Arguments(0);
// バックアップするかチェックする間隔(ミリ秒)
var PERIOD = 60 * 1000;

var AutoBackup = {
	"run": function(file) {
		var fs = WScript.CreateObject("Scripting.FileSystemObject");

		if (! fs.FileExists(file) ) {
			WScript.Echo(file + "is not exist!!");
			WScript.Quit();
		}
		var base = fs.GetParentFolderName(file) + "\\" + fs.GetBaseName(file);
		var ext  = fs.GetExtensionName(file);
		var now  = new Date();
		var copy_to = base + "_" + this.format_date(now) + "." + ext;
		if (! fs.FileExists(copy_to) ) {
			fs.CopyFile(file, copy_to);
		}
	},
	"format_date": function(date) {
		var year = this.padding_zero(date.getFullYear(), 4);
		var month = this.padding_zero(date.getMonth() + 1, 2);
		var day	= this.padding_zero(date.getDate(), 2);
		var hour = this.padding_zero(date.getHours(), 2);
		var min = this.padding_zero(date.getMinutes(), 2);
		var sec = this.padding_zero(date.getSeconds(), 2);
		return ( year + month + day + "_" + hour + min + sec );
	},
	"padding_zero": function(num, length) {
		num += "";
		while ( num.length < length ) {
			num = "0" + num;
		}
		return "" + num;
	},
	"assert_equal": function(expected, got, test_name) {
		if ( expected != got ) {
			WScript.Echo("failed test: " + test_name + " ( expected " + expected + ", but got " + got + ")");
		}
	}
};

var DEBUG=0;
if ( DEBUG ) {
	// testing padding_zero
	AutoBackup.assert_equal("07", AutoBackup.padding_zero(7, 2), "padding test");
	
	var dt = new Date(2009, 8, 1, 1, 2, 3);
	AutoBackup.assert_equal("20090901_010203", AutoBackup.format_date(dt), "format_date");
} else {

	var fs = WScript.CreateObject("Scripting.FileSystemObject");
	var pid_file = fs.GetParentFolderName(TARGET) + "\\" + fs.GetBaseName(TARGET) + ".pid";
	if ( !fs.FileExists(pid_file) ) {
		var pid = fs.CreateTextFile(pid_file);
		pid.WriteLine("dummy");
		pid.Close();
	}

	var lastmodified = "";
	while (1) {
		if ( !fs.FileExists(pid_file) ) {
			WScript.Quit();
		}
		var f = fs.GetFile(TARGET);
		var lm = f.DateLastModified + ""; // どうもそのまま比較はどうもダメらしい
		if ( !lastmodified || ( lm != lastmodified ) ) {
			WScript.Echo(lm + " " + lastmodified );
			AutoBackup.run(TARGET);
		}

		lastmodified = lm;
		WScript.Sleep(PERIOD);
	}
}