add purge command

cmd/perm.js

@@ -69,4 +69,26 @@ class WhitelistGuild extends Command {
 
 initializer.addCommand(new WhitelistGuild());
 
+class Purge extends Command {
+	name = 'purge';
+	whitelist = true;
+	func = async function (msg, args, ctx) {
+		let guilds = await ctx.bot.guilds;
+		let whitelist = ctx.whitelist.guild;
+		let purged = 0;
+		guilds.forEach((guild) => {
+			if (!whitelist(guild)) {
+				this.log.info(`purging guild ${guild.name} (${guild.id})`);
+				guild.leave();
+				purged++;
+			} else {
+				this.log.info(`keeping guild ${guild.name} (${guild.id})`);
+			}
+		});
+		msg.channel.createMessage(`purged ${purged} guilds.`);
+	};
+}
+
+initializer.addCommand(new Purge());
+
 export default initializer;