Gigachad Template.user.js

// ==UserScript==
// @name        Gigachad Template
// @namespace   Violentmonkey Scripts
// @match       https://multiplayerpiano.net/*
// @grant       none
// @version     1.0
// @author      Hri7566
// @description 11/9/2023, 10:33:05 PM
// ==/UserScript==

// Command class

class Command {
  static commands = [];

  constructor(aliases, callback) {
    this.aliases = aliases;
    this.callback = callback;
    Command.commands.push(this);
  }
}

// Chat listener

let prefix = "!";

MPP.client.on("a", msg => {
  if (!msg.a.startsWith(prefix)) return;

  msg.args = msg.a.split(" ");
  msg.usedCommand = msg.args[0].substring(prefix.length).trim();

  for (const cmd of Command.commands) {
    if (!cmd.aliases.includes(msg.usedCommand)) continue;
    let out = cmd.callback(msg);
    if (out) MPP.client.sendArray([{m: "a", message: out}]);
    return;
  }
});

// Commands

new Command(["help", "h", "cmds"], msg => {
  return "Commands: " + Command.commands.map(cmd => prefix + cmd.aliases[0]).join(" | ");
});

new Command(["id"], msg => {
  return "ID: `" + msg.p._id + "`";
});