A rewrite of the original 2015 web browser version of EpicOS for Multiplayer Piano.
// ==UserScript==
// @name EpicOS (v1) - Rewritten
// @namespace callum fisher
// @version 1.0.11
// @license Unlicense
// @description A rewrite of the original 2015 web browser version of EpicOS for Multiplayer Piano.
// @author callum fisher
// @match *://mppclone.com/*
// @match *://mpp.8448.space/*
// @match *://multiplayerpiano.com/*
// @match *://multiplayerpiano.net/*
// @match *://multiplayerpiano.org/*
// @match *://*.multiplayerpiano.dev/*
// @match *://piano.mpp.community/*
// @match *://mpp.autoplayer.xyz/*
// @match *://mpp.hyye.tk/*
// @match *://mppclone.hri7566.info/*
// @match *://piano.ourworldofpixels.com/*
// @match *://mpp.hri7566.info/*
// @match *://mppclone.hri7566.info/*
// @match *://smp-meow.com/*
// @grant none
// ==/UserScript==
/*
callum fisher - 2024.12.21 - 2025.12.03
This is a rewrite of the original 2015 web browser version of EpicOS. I have:
- Compiled separate message listeners into one
- Changed the command handler to a switch statement
- Removed unnecessary type coercion
- Added an anti-spam chat send function
*/
const startEOS = () => {
// User-defined settings:
let cmdChar = '/'; // What a message should start with to be recognized as a command - You can change this to anything
let welcomeUsers = false; // Whether or not to welcome users that enter the room (true/false)
let sendStartUpMsg = false; // Whether or not to send a greeting message on start-up (true/false)
let antiSpamTimeout = 40000; // Time in milliseconds before the bot can repeat its last chat message - Can be any value in milliseconds
// Define settings:
let selfID = MPP.client.getOwnParticipant()._id; // Your _ID on Multiplayer Piano
let version = '1.0.11';
let editDate = '2025.12.03';
console.log(`[EpicOS (v1) - Rewritten v${version}] Running.`);
// Define & compile command list:
let commands = cmdChar + [
'help',
'lol',
'test',
'say',
'encode (Encode Text)',
'decode (Decode Text)',
'binary (Turn Text to Binary)',
'myinfo',
'8ball (Not magic)',
'about'
].join(', ' + cmdChar);
// Define message send function:
let lastMessage = {
t: Date.now(),
m: ''
}
let sendMessage = input => {
if (input === lastMessage.m && Date.now() - lastMessage.t < antiSpamTimeout) return;
lastMessage = {
t: Date.now(),
m: input
}
MPP.chat.send(input);
}
// Send a start-up message:
if (sendStartUpMsg) sendMessage(`EpicOS (v1) is here! Type ${cmdChar}help for the command list.`);
// Listen for 'hi' message & fetch _ID:
MPP.client.on('hi', () => {
selfID = MPP.client.getOwnParticipant()._id;
});
// Listen for chat messages:
MPP.client.on('a', msg => {
selfID = MPP.client.getOwnParticipant()._id;
if (!msg.a.startsWith(cmdChar) || msg.a === cmdChar) return;
let name = msg.p.name;
let _id = msg.p._id;
let color = msg.p.color;
let cmd = msg.a.split(cmdChar)[1].split(' ')[0].trim();
let input = msg.a.split(cmd)[1].trim();
switch (cmd) {
// Public commands:
case 'help':
sendMessage(`✨✨ EpicOS commands: ${commands} ✨✨`);
break;
case 'test':
sendMessage(`The bot is active and working correctly, ${name}!`);
break;
case 'myinfo':
case 'info':
sendMessage(`Hi, ${name}. Your _ID is '${_id}'. ${_id === msg.p.id ? '' : 'Your ID is: \'' + msg.p.id + '\'. '}Your colour is ${color} (${new Color(color).getName()}). That's all I have!`);
break;
case 'lol':
sendMessage(`${name.startsWith(cmdChar) ? '...' + name : name} laughs so hard they begin to choke. *Hands ${name} a glass of water.*`);
break;
case 'say':
case 'echo':
if (!input) {
sendMessage(`Please input a word/sentence for me to say! :P (Example: ${cmdChar}${cmd} Hello!)`);
return;
} else if (input.startsWith(cmdChar)) {
sendMessage('Not today.');
return;
}
sendMessage(input);
break;
case '8ball':
if (!input) {
sendMessage(`Please input something for the (ⁿᵒᵗ⁻ˢᵒ⁻ᵐᵃᵍᶦᶜ)8ball to respond to! (Example: ${cmdChar}${cmd} Are you clever?)`);
return;
}
let responses = ['xD Lol no.', 'Hell no!', 'Are you kidding??? xD Lol no', 'Never.', 'Maybe.', 'Go away pls.', 'Yes. No question about it.', 'Yep, sure, whatever.', 'Did you say something?', 'Could you speak louder? I couldn\'t read that'];
sendMessage(`8ball: ${responses[Math.floor(Math.random() * responses.length)]}`);
break;
case 'encode':
if (!input) {
sendMessage(`Please input something for me to encode! (Example: ${cmdChar}${cmd} Hello!)`);
return;
}
sendMessage(encode(input));
break;
case 'decode':
if (!input) {
sendMessage(`Please input something for me to decode! (Example: ${cmdChar}${cmd} SGVsbG8h)`);
return;
}
try {
sendMessage(`Here: ${decode(input)}`);
} catch (err) {
sendMessage('Try something that has already been encoded.');
}
break;
case 'binary':
if (!input) {
sendMessage(`Please input something for me to convert to binary (Example: ${cmdChar}${cmd} Hello!)`);
return;
}
sendMessage(toBinary(input));
break;
case 'about':
sendMessage(`EpicOS (v1) [2015] - Rewritten v${version} | 2024.12.21 - ${editDate} | Source: https://greasyfork.org/scripts/521353`);
break;
// Private commands:
case 'welcome':
if (_id !== selfID) return;
if (!input) {
welcomeUsers = !welcomeUsers;
} else {
input = input.toLowerCase();
welcomeUsers = input === 'on';
}
sendMessage(`Welcome messages are ${welcomeUsers ? 'on' : 'off'}.`);
break;
case 'clear':
if (_id !== selfID) return;
MPP.chat.clear();
break;
}
});
// Listen for new users:
MPP.client.on('participant added', msg => {
if (msg.id && msg.id === MPP.client.getOwnParticipant().id) return;
if (welcomeUsers) sendMessage(`Welcome, ${msg.name}! Feel free to try out my commands by sending ${cmdChar}help`);
});
let toBinary = input => {
let output = '';
for (let i = 0; i < input.length; i++) {
let e = input[i].charCodeAt(0);
let s = '';
do {
let a = e % 2;
e = (e - a) / 2;
s = a + s;
} while (e !== 0);
while (s.length < 8) {
s = '0' + s;
}
output += s + ' ';
}
return output;
}
let encode = input => {
return window.btoa(unescape(encodeURIComponent(input)));
}
let decode = input => {
return decodeURIComponent(escape(window.atob(input)));
}
}
// Start:
if (!window.addEventListener) {
window.attachEvent('onload', startEOS);
} else {
window.addEventListener('load', startEOS);
}