overriding fetchTiddler

fetchTiddlerAjax

function TiddlyWiki()
{
	var tiddlers = {}; // Hashmap by name of tiddlers
	this.tiddlersUpdated = false;
	this.namedNotifications = []; // Array of {name:,notify:} of notification functions
	this.notificationLevel = 0;
	this.slices = {}; // map tiddlerName->(map sliceName->sliceValue). Lazy.
	this.clear = function() {
		tiddlers = {};
		this.setDirty(false);
	};
	var cache = {};
	this.fetchTiddler = function(title) {
		var tid = new Tiddler("bar");
		tid.text = "hello";
		return tid;
	};
	this.deleteTiddler = function(title) {
		delete this.slices[title];
		delete tiddlers[title];
	};
	this.addTiddler = function(tiddler) {
		delete this.slices[tiddler.title];
		tiddlers[tiddler.title] = tiddler;
	};
	this.forEachTiddler = function(callback) {
		for(var t in tiddlers) {
			var tiddler = tiddlers[t];
			if(tiddler instanceof Tiddler)
				callback.call(this,t,tiddler);
		}
	};
}