q promises in node test

gistfile1.txt

var q = require('/home/wwwyzzerdd/node_modules/q'),
	fs = require('fs');

var foo = function () {
	var deferred = q.defer();
	fs.readFile('in.txt', 'utf8', deferred.makeNodeResolver());
	return deferred.promise;
};

var read = function () {
	var deferred = q.defer();
	fs.readFile('in.txt', 'utf8', deferred.makeNodeResolver());
	return deferred.promise;
};

var write = function (data) {
	var deferred = q.defer();
	fs.writeFile('out.txt', data, 'utf8', deferred.makeNodeResolver());
	return deferred.promise;
};

var bar = function (p) {
	console.log(p);
};

var error = function (err) {
	console.log(err);
};

var stack = function () {
	return q.all([
		foo().then(bar, error),
		foo().then(bar, error)
	]);
};

read().then(write).then(function () { console.log('DONE'); }, error);

//stack();

// foo().then(bar, error);

// readWrite();