I guess its my turn to write a flow control library

tiny-flow-control.coffee

###
My tiny little flow control library.
Usage: 
	$.Deferred.invoke func, context, ...args
	  	func - Function with its two final parameters being onSuccess and onError
	  	context - context to bind to 'this' when func is invoked
	  	args - flat list of arguments
	  Returns:
	  	jQuery Deferred object

	gettingFs = $.Deferred.invoke(window.requestFileSystem, window, TEMPORARY, 0);
	gettingFs.done(function(fileSystem) {console.log("ok", fileSystem) });
	gettingFs.error(function(err){console.log("error", err)});
###
slice = Array.prototype.slice
$.extend $.Deferred, 
  invoke: (func,ctx) ->
  	args = slice.call arguments, 2 
  	$.Deferred (d) ->  		
  		args.push -> d.resolve.apply d, arguments
  		args.push -> d.reject.apply d, arguments
  		func.apply ctx, args