Unknown Command Command

commands/util/unknown-command.js

@@ -0,0 +1,29 @@
+const Command = require('../../structures/Command');
+const meant = require('meant');
+const { stripIndents } = require('common-tags');
+
+module.exports = class UnknownCommandCommand extends Command {
+	constructor(client) {
+		super(client, {
+			name: 'unknown-command',
+			group: 'util',
+			memberName: 'unknown-command',
+			description: 'Displays help information for when an unknown command is used.',
+			unknown: true,
+			hidden: true,
+			guarded: true
+		});
+	}
+
+	run(msg) {
+		const commands = this.client.registry.commands.map(c => c.name);
+		const command = msg.content.match(this.client.dispatcher._commandPatterns[this.client.commandPrefix])[2];
+		const didYouMean = meant(command, commands);
+		const inGuild = msg.guild ? undefined : null;
+		return msg.reply(stripIndents`
+			Unknown command. Use ${msg.anyUsage('help', inGuild, inGuild)} to view the command list.
+
+			${didYouMean && didYouMean.length ? `Did You Mean:\n${didYouMean.join('\n')}` : ''}
+		`);
+	}
+};