Add shuffle command

src/commands/shuffle.ts

@@ -0,0 +1,29 @@
+import {Message} from 'discord.js';
+import {TYPES} from '../types';
+import {inject, injectable} from 'inversify';
+import Queue from '../services/queue';
+import Command from '.';
+
+@injectable()
+export default class implements Command {
+  public name = 'shuffle';
+  public description = 'shuffle current queue';
+  private readonly queue: Queue;
+
+  constructor(@inject(TYPES.Services.Queue) queue: Queue) {
+    this.queue = queue;
+  }
+
+  public async execute(msg: Message, _: string []): Promise<void> {
+    const queue = this.queue.get(msg.guild!.id);
+
+    if (queue.length <= 2) {
+      await msg.channel.send('error: not enough songs to shuffle');
+      return;
+    }
+
+    this.queue.shuffle(msg.guild!.id);
+
+    await msg.channel.send('`' + JSON.stringify(this.queue.get(msg.guild!.id).slice(0, 10)) + '`');
+  }
+}

src/inversify.config.ts

@@ -25,6 +25,7 @@ import Config from './commands/config';
 import Play from './commands/play';
 import QueueCommad from './commands/queue';
 import Seek from './commands/seek';
+import Shuffle from './commands/shuffle';
 
 let container = new Container();
 
@@ -41,6 +42,7 @@ container.bind<Command>(TYPES.Command).to(Config).inSingletonScope();
 container.bind<Command>(TYPES.Command).to(Play).inSingletonScope();
 container.bind<Command>(TYPES.Command).to(QueueCommad).inSingletonScope();
 container.bind<Command>(TYPES.Command).to(Seek).inSingletonScope();
+container.bind<Command>(TYPES.Command).to(Shuffle).inSingletonScope();
 
 // Config values
 container.bind<string>(TYPES.Config.DISCORD_TOKEN).toConstantValue(DISCORD_TOKEN);

src/packages.d.ts

@@ -1,2 +1,3 @@
 declare module 'node-emoji';
 declare module 'ytsr';
+declare module 'array-shuffle';

src/services/queue.ts

@@ -1,4 +1,5 @@
 import {injectable} from 'inversify';
+import shuffle from 'array-shuffle';
 
 export interface QueuedPlaylist {
   title: string;
@@ -84,6 +85,16 @@ export default class {
     }
   }
 
+  shuffle(guildId: string): void {
+    const queue = this.guildQueues.get(guildId);
+
+    if (!queue) {
+      throw new Error('Queue doesn\'t exist yet.');
+    }
+
+    this.guildQueues.set(guildId, [queue[0], ...shuffle(queue.slice(1))]);
+  }
+
   size(guildId: string): number {
     return this.get(guildId).length;
   }