Username-completion

Tab cycles through users starting with characters
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// ==UserScript==
// @name           Username-completion
// @namespace      tag://kongregate
// @description    Tab cycles through users starting with characters
// @include        http://www.kongregate.com/games/*
// @author         Ventero
// @date           03.01.2012
// @version        1.5
// require        http://kong.ventero.de/updates/49872.js
// ==/UserScript==

// Written by Ventero (http://www.kongregate.com/accounts/Ventero) 05/23/09
// Thanks to kaedenn for the idea of adding a colon if the username is the first word in the message
// Copyright (c) 2009-2012 Ventero, licensed under MIT/X11 license
// http://www.opensource.org/licenses/mit-license.php

var s = document.createElement("script");
s.textContent = "(" +
function init_nameCompletion(){
	if(typeof ChatDialogue === "undefined" ||
	   ChatDialogue.prototype.oldKeyPressTab) return;

	var isChrome = (navigator.appVersion.indexOf("Chrome") >= 0);
	if(isChrome) {
		ChatDialogue.prototype.initialize =
		ChatDialogue.prototype.initialize.wrap(function(old, p, i, h, u){
			old(p, i, h, u);
			var self = this;
			this._input_node.observe("keydown", function(event) {
				if(event.keyCode != 9 || event.ctrlKey || event.altKey || event.metaKey) return;
				self.onKeyPress(event);
			});
		})
	}

	ChatDialogue.prototype.oldKeyPressTab = ChatDialogue.prototype.onKeyPress;
	ChatDialogue.prototype.tabcnt = 0;
	ChatDialogue.prototype.done = 1;
	ChatDialogue.prototype.onKeyPress = function(a){
		if (a.keyCode != 9 || a.ctrlKey){
			this.tabcnt = 0;
			this.done = 1;
			this.oldKeyPressTab(a);
			return;
		}

		var node = (this._input_node.wrappedJSObject || this._input_node);
		if (this.tabcnt == 0 && this.done == 1){
			var inputText = node.getValue(),
			    spaceAtCaret = inputText.substr(0, node.selectionStart).lastIndexOf(' ');
			this._caretPos = node.selectionStart;
			this._start = inputText.substr(0,spaceAtCaret);
			if(this._start) this._start+=" ";

			this._currentWord = inputText.substring(spaceAtCaret+1, this._caretPos);
			this._rest = inputText.substr(this._caretPos);
		}
		this.done = 0;

		var userArray = this._holodeck.chatWindow().activeRoom()._users_list,
		    possibleMatches = [],
		    z = node.getValue();
		if (z.match(/\s+$/)) z=z.replace(/\s+$/, '')

		for (var i=0;i<userArray.length;i++){
			if(userArray[i].username.toLowerCase().indexOf(this._currentWord.toLowerCase())==0){
				possibleMatches.push(userArray[i].username);
			}
		}

		if (this.tabcnt < possibleMatches.length){
			node.setValue(this._start + possibleMatches[this.tabcnt] + (this._start?" ":": ") + this._rest);
			node.selectionStart = this._caretPos + possibleMatches[this.tabcnt].length - this._currentWord.length+(this._start?1:2);
			node.selectionEnd = node.selectionStart;
			this.tabcnt+=1;
		} else {
			node.setValue(this._start + this._currentWord + this._rest);
			node.selectionStart = this._caretPos;
			node.selectionEnd = this._caretPos;
			this.tabcnt = 0
		}
		if(a.stop) a.stop();
		if(a.preventDefault) a.preventDefault();
	}
} + ")();";

window.setTimeout(function(){
	document.body.appendChild(s);
	document.body.removeChild(s);
}, 0);