Jake task to continously monitor the javascript and less files for the project, and rebuild them as necessary

watch.jake

desc('Continously monitors the javascript and less files for the project, and rebuilds them as necessary');
task('watch', ['build'], function () {
	// Recursively watch files with a callback
	var fs = require('fs');
	var files = [];

	var findFilesAndWatch = function (path) {
		fs.stat(path, function (err, stats) {
			if (err) {
				return false;
			}
			if (stats.isFile()) {
				files.push(path);
				fs.watchFile(path, changeCallbackFactory(path));
			}
			else if (stats.isDirectory()) {
				fs.readdir(path, function (err, dirListing) {
					if (err) {
						return log.fatal(err);
					}
					for (var f in dirListing) {
						findFilesAndWatch(path + '/' + dirListing[f]);
					}
				});
			}
		});
	};

	var changeCallbackFactory = function (file) {
		return function (cur, prev) {
			if (cur.mtime > prev.mtime) {
				stopWatch();
				var fileTask = jake.Task[file];
				if (fileTask) {
					fileTask.modTime = cur.mtime;
				}
				jake.Task['build'].reenable(true);
				jake.Task['build'].invoke();
				startWatch();
			}
		};
	};

	var startWatch = function () {
		for (var i = 0; i < files.length; i++) {
			fs.watchFile(files[i], changeCallbackFactory(files[i]));
		}
	};
	var stopWatch = function () {
		for (var i = 0; i < files.length; i++) {
			fs.unwatchFile(files[i]);
		}
	};

	findFilesAndWatch('themes');
}, {async: true});

Yea that works for me, thanks. On vacation in Italy for the next 2 weeks, but I'll work on this when I get back.

…

Sent from my iPad

On Jun 9, 2012, at 11:34 PM, Matthew ***@***.*** wrote: All right, this is in master. Just do someTask.addListener('error', function (e) {}); and call via `invoke`. If you don't set an explicit listener, it's handled the way it's always been. Let me know if this works for you. --- Reply to this email directly or view it on GitHub: https://gist.github.com/2830614