Simple OS Chatbot

[Frank]

0.4 - added markov chains! Copy and paste them for ideas!

Code:

// ==UserScript==
// @name         Frank's Chatbot
// @namespace    http://tampermonkey.net/
// @version      0.4
// @description  try to take over the world! maybe some musical stuff, too
// @author       Frank
// @match        https://onlinesequencer.net/chat/
// @grant        none
// @run-at       context-menu
// ==/UserScript==

(function() {
    'use strict';
    var botKeyword = '!do ';
    var lastChatId;
    var lastUser;
    function Command(name, desc, code){
        this.name=name;
        this.desc=desc;
        this.code=code;
        this.toString = () => this.name
    }
    var commands = {
        me: new Command('me', 'me --> You are ...', function(command){
            post('You are ' + lastUser)
        }),
        random: new Command('random', 'random | [user id] --> ##random (in key / featured from [user id])', function(command){
            if(typeof command[1] == 'undefined') {
                $.get('https://onlinesequencer.net/ajax/random.php', function(r){
                    post('##'+r.slice(r.search(/="\/\d/)+3,r.search(/\d" o/)+1))
                })
            }
            else {
                $.get('https://onlinesequencer.net/ajax/random.php?user='+command[1], function(r){
                    var userArg = r.slice(r.search('More by'),r.search('</a>\n'));
                    if (userArg) post(userArg+': ##'+r.slice(r.search(/="\/\d/)+3,r.search(/\d" o/)+1))
                    else post('Unknown User Id')
                })
            }
        }),
        markov: new Command('markov', 'markov | [notes] --> generates a markov chain of [notes] notes which you can copy', function(command){
            function txtNote(time, type) {
                this.time = time;
                this.type = type;
                this.toString = () => time + ' ' + types[type] + ' 1 0;'
            }
            var notes = [new txtNote(0, 0), new txtNote(1, Math.floor(3 * Math.random()))];
            var types = ['A5', 'D5', 'G5'];
            var chainData = {
                '00': [0.18, 0.6, 0.22],
                '01': [0.5, 0.5, 0],
                '02': [0.15, 0.75, 0.1],
                '10': [0, 0, 1],
                '11': [0.25, 0, 0.75],
                '12': [0.9, 0.1, 0],
                '20': [0.4, 0.4, 0.2],
                '21': [0.5, 0.25, 0.25],
                '22': [1, 0, 0]
            }
            var loop = 16;
            if(!isNaN(parseInt(command[1]))) loop = parseInt(command[1]);
            for (var time = 2; time < loop; time++) {
                var past = notes.slice(-2).map(x => x.type).join('');
                var rand = Math.random();
                var type = 0;
                while (rand >= chainData[past][type]) {
                    rand -= chainData[past][type];
                    type++
                }
                notes.push(new txtNote(time, type))
            }
            post('Online Sequencer:1:' + notes.join(''))
        }),
        stop: new Command('stop', 'stop --> stops bot', function(command){
            clearInterval(clearId);
            post('Stopped.')
        }),
        help: new Command('help', 'help | [command] --> gives desc. of [command]', function(command){
            var helped = commands[command[1]]
            if(typeof command[1] == 'undefined') post(botKeyword+'[command] | [arg1] | [arg2] ... "'+botKeyword+'help | help" for help on help. All Commands: ' + Object.keys(commands).join(', '))
            else post(helped?botKeyword+helped.desc:'Unknown command. Cannot help.')
        })
    }

    function tickBot() {
        //get latest chat message
        var lastChat = document.getElementById('chat_table').lastElementChild;

        //check if it is new
        if (lastChat.id == lastChatId) {
            lastChatId = lastChat.id;
            return
        } else {
            lastChatId = lastChat.id
        }

        //parse the chat message
        lastUser = lastChat.children[0].children[0].innerText;
        var lastMessage = lastChat.children[1].innerText;

        //logic and send
        if (lastMessage.substr(0, botKeyword.length) == botKeyword) {
            var command = lastMessage.slice(botKeyword.length).split(' | ');
            if(commands[command[0]]) setTimeout(commands[command[0]].code,0,command)
            else post('Invalid command. "'+botKeyword+'help" for help.')
        }
    }

    function post(message) {
        var message1 = '​' + message
        if (message1.length > 256) return post('Tried to post; message too long.')
        $.post('xmlhttp.php?action=ajaxchat_send', {
            message: message1
        })
    }

    if($.post) {post('Started. "'+botKeyword+'help" for help.');
                var clearId = setInterval(tickBot, 500)
                }
    else console.log('Not in IFrame')
})()