Tab autocomplete v0.2.1

// ==UserScript==
// @name         Tab autocomplete
// @version      0.2.1
// @description  irc-like feature, improved and better looking version, shift+tab adds @
// @author       Ravana
// @match        https://plug.dj/*
// @require http://code.jquery.com/jquery-latest.js
// ==/UserScript==

var knownNames = [];
var savedNames = [];
var msgStart = "";
var msgEnd = "";
var message = "";

$.extend($.expr[":"], {
    "starts-with": function(elem, i, data, set) {
        var text = $.trim($(elem).text()),
            term = data[3];
        return text.indexOf(term) === 0;
    },

    "ends-with": function(elem, i, data, set) {
        var text = $.trim($(elem).text()),
            term = data[3];
        return text.lastIndexOf(term) === text.length - term.length;
    }
});

setTimeout(function() {
    $.each(API.getUsers(), function(index, value) {
        if (knownNames.indexOf(value["username"]) == -1) knownNames.push(value["username"]);
    });
    knownNames.sort();
    API.on(API.USER_JOIN, userJoin);

    function userJoin(data) {
        if (knownNames.indexOf(data.username) == -1) knownNames.push(data.username);
        knownNames.sort();
    }
    API.on(API.USER_LEAVE, userLeave);

    function userLeave(data) {
        knownNames.splice(knownNames.indexOf(data.username), 1);
    }

    $("#chat-input-field").keydown(function(e) {
        if (e.keyCode == 13 || e.keyCode==8 || e.keyCode==32 || e.keyCode==27) {
            savedNames = [];
            msgStart = "";
            message = "";
            $(".cm:starts-with(Matched: ):not(:last)").remove();
        }
        if (e.keyCode == 27) {
            knownNames = [];
            $.each(API.getUsers(), function(index, value) {
               if (knownNames.indexOf(value["username"]) == -1) knownNames.push(value["username"]);
            });
            knownNames.sort();
            $(".cm:starts-with(Matched: )").remove();
        }
        if (e.keyCode == 9) {
            e.preventDefault();
            if(e.shiftKey) {
                message = $("#chat-input-field").val();
                $("#chat-input-field").val(message+"@");
            } else {
                if(savedNames.length<1){
                    message = $("#chat-input-field").val();
                    message = message.split(" ");
                    msgEnd = message.pop();
                    message = message.join(" ");
                    for(var i = 0; i < knownNames.length;i++){
                        if(knownNames[i].toLowerCase().indexOf(msgEnd.toLowerCase())==0)savedNames.push(knownNames[i]);
                    }
                    if(savedNames.length==0){
                        return;
                    }
                    if(message){$("#chat-input-field").val(message+" "+savedNames[0]);}else{$("#chat-input-field").val(savedNames[0]);}
                    if(savedNames.length==1){
                        return;
                    }
                    if(msgEnd)API.chatLog("Matched: " + savedNames.join("/"));
                    $(".cm:starts-with(Matched: ):not(:last)").remove();
                } else {
                    //console.log("saved > 1");
                    var q = savedNames.shift();
                    savedNames.push(q);
                    if(message){$("#chat-input-field").val(message+" "+savedNames[0]);}else{$("#chat-input-field").val(savedNames[0]);}
                }
            }
        }
    });
},10000);