Did multiple things.

- Added command handler.
- Added hello command.
- Added utility commands.
- Added lockfile.

package.json

@@ -13,7 +13,8 @@
   "author": "Keanu Timmermans",
   "license": "Apache-2.0",
   "dependencies": {
-    "discord.js": "^12.2.0"
+    "discord.js": "^12.2.0",
+    "ms": "^2.1.2"
   },
   "devDependencies": {
     "eslint": "^7.0.0",

src/Commands/Hello.js

@@ -0,0 +1,13 @@
+const Command = require("./../Structures/Command.js");
+
+module.exports = class extends Command {
+  constructor(...args) {
+    super(...args, {
+      aliases: ["hallo"]
+    })
+  }
+
+  async run(message, args) {
+    message.channel.send("Hello");
+  }
+}

src/Commands/Utilities/Ping.js

@@ -0,0 +1,21 @@
+const Command = require('../../Structures/Command');
+
+module.exports = class extends Command {
+
+	constructor(...args) {
+		super(...args, {
+			aliases: ['pong']
+		});
+	}
+
+	async run(message) {
+		const msg = await message.channel.send('Pinging...');
+
+		const latency = msg.createdTimestamp - message.createdTimestamp;
+		const choices = ['Is this really my ping?', "Is this okay? I can't look!", "I hope it isn't bad!"];
+		const response = choices[Math.floor(Math.random() * choices.length)];
+
+		msg.edit(`${response} - Bot Latency: \`${latency}ms\`, API Latency: \`${Math.round(this.client.ws.ping)}ms\``);
+	}
+
+};

src/Commands/Utilities/Uptime.js

@@ -0,0 +1,10 @@
+const Command = require("../../Structures/Command.js");
+const ms = require("ms");
+
+module.exports = class extends Command {
+
+  async run(message) {
+    message.channel.send(`My uptime is \`${ms(this.client.uptime, {long: true})}\``);
+  }
+
+}

src/Structures/BotClient.js

@@ -1,4 +1,5 @@
-const { Client } = require('discord.js');
+const { Client, Collection } = require('discord.js');
+const Util = require('./Util.js');
 
 module.exports = class BotClient extends Client {
 
@@ -8,6 +9,12 @@ module.exports = class BotClient extends Client {
 		});
 		this.validate(options);
 
+		this.commands = new Collection();
+
+		this.aliases = new Collection();
+
+		this.utils = new Util(this);
+
 		this.once('ready', () => {
 			console.log(`Logged in as ${this.user.username}.`);
 		});
@@ -26,8 +33,9 @@ module.exports = class BotClient extends Client {
 			// eslint-disable-next-line no-unused-vars
 			const [cmd, ...args] = message.content.slice(prefix.length).trim().split(/ +/g);
 
-			if (cmd.toLowerCase() === 'hello') {
-				message.channel.send('Hello!');
+			const command = this.commands.get(cmd.toLowerCase()) || this.commands.get(this.aliases.get(cmd.toLowerCase()));
+			if (command) {
+				command.run(message, args);
 			}
 		});
 	}
@@ -44,6 +52,7 @@ module.exports = class BotClient extends Client {
 	}
 
 	async start(token = this.token) {
+		this.utils.loadCommands();
 		super.login(token);
 	}
 

src/Structures/Command.js

@@ -0,0 +1,15 @@
+module.exports = class Command {
+  constructor(client, name, options = {}) {
+    this.client = client;
+    this.name = options.name || name;
+    this.aliases = options.aliases || [];
+    this.description = options.description || "No description provided.";
+    this.category = options.category || "Miscellaneous";
+    this.usage = options.usage || "No usage provided.";
+  }
+
+  // eslint-disable-next-line no-unused-vars
+  async run(message, args) {
+    throw new Error(`Command ${this.name} doesn't provide a run method.`)
+  }
+}

src/Structures/Util.js

@@ -0,0 +1,41 @@
+const path = require('path');
+const { promisify } = require('util');
+const glob = promisify(require('glob'));
+const Command = require('./Command.js');
+
+module.exports = class Util {
+
+	constructor(client) {
+		this.client = client;
+	}
+
+	isClass(input) {
+		return typeof input === 'function' &&
+        typeof input.prototype === 'object' &&
+        input.toString().substring(0, 5) === 'class';
+	}
+
+	get directory() {
+		return `${path.dirname(require.main.filename)}${path.sep}`;
+	}
+
+	async loadCommands() {
+		return glob(`${this.directory}commands/**/*.js`).then(commands => {
+			for (const commandFile of commands) {
+				delete require.cache[commandFile];
+				const { name } = path.parse(commandFile);
+				const File = require(commandFile);
+				if (!this.isClass(File)) throw new TypeError(`Command ${name} doesn't export a class.`);
+				const command = new File(this.client, name.toLowerCase());
+				if (!(command instanceof Command)) throw new TypeError(`Command ${name} doesn't belong in commands.`);
+				this.client.commands.set(command.name, command);
+				if (command.aliases.length) {
+					for (const alias of command.aliases) {
+						this.client.aliases.set(alias, command.name);
+					}
+				}
+			}
+		});
+	}
+
+};