Add patronOnly Option

structures/Command.js

@@ -1,10 +1,12 @@
 const { Command } = require('discord.js-commando');
+const { stripIndents } = require('common-tags');
 
 module.exports = class XiaoCommand extends Command {
 	constructor(client, info) {
 		if (!info.argsPromptLimit) info.argsPromptLimit = 2;
 		super(client, info);
 
+		this.patronOnly = info.patronOnly || false;
 		this.argsSingleQuotes = info.argsSingleQuotes || false;
 		this.throttling = info.unknown ? null : info.throttling || { usages: 2, duration: 5 };
 		this.uses = 0;
@@ -16,4 +18,14 @@ module.exports = class XiaoCommand extends Command {
 			reason: 'Code'
 		});
 	}
+
+	hasPermission(msg) {
+		if (this.patronOnly && !this.client.patreon.isPatron(msg.author.id)) {
+			return stripIndents`
+				The \`${this.name}\` command can only be used by Patrons.
+				Visit <https://www.patreon.com/xiaodiscord> to sign-up!
+			`;
+		}
+		return true;
+	}
 };