LESSwatch

lesswatch.js

var watch_dir = './www/less';

var files = {
//	'input.less': 'output.css'
	'./www/less/screen.less': './www/css/screen.css'
};

var interval = 100; // ms

var fs = require('fs');
var exec = require('child_process').exec;

var dirty = true;

var compile = function(input, output) {
	exec("lessc -x " + input + " > " + output, function(error, stdout, stderr) {
		if(stdout)
			console.log(stdout);
		if(stderr)
			console.log("ERROR: "+stderr);
		if(!error)
			console.log("COMPILED | %s > %s | %s\r\n", input, output, new Date().toLocaleTimeString());
	});
};

var compileAll = function() {
	for(var key in files) {
		compile(key, files[key]);
	}
};

var check = function() {
	if(dirty) {
		dirty = false;
		compileAll();
	}
	setTimeout(check, interval);
};

fs.watch(watch_dir, function() {
	dirty = true;
});

// run checking
check();