Add /loop support for individual songs (#707)

src/commands/loop.ts

@@ -0,0 +1,34 @@
+import {ChatInputCommandInteraction} from 'discord.js';
+import {TYPES} from '../types.js';
+import {inject, injectable} from 'inversify';
+import PlayerManager from '../managers/player.js';
+import Command from '.';
+import {SlashCommandBuilder} from '@discordjs/builders';
+import {STATUS} from '../services/player';
+
+@injectable()
+export default class implements Command {
+  public readonly slashCommand = new SlashCommandBuilder()
+    .setName('loop')
+    .setDescription('toggle looping the current song');
+
+  public requiresVC = true;
+
+  private readonly playerManager: PlayerManager;
+
+  constructor(@inject(TYPES.Managers.Player) playerManager: PlayerManager) {
+    this.playerManager = playerManager;
+  }
+
+  public async execute(interaction: ChatInputCommandInteraction): Promise<void> {
+    const player = this.playerManager.get(interaction.guild!.id);
+
+    if (player.status === STATUS.IDLE) {
+      throw new Error('no song to loop!');
+    }
+
+    player.loopCurrentSong = !player.loopCurrentSong;
+
+    await interaction.reply((player.loopCurrentSong ? 'looped :)' : 'stopped looping :('));
+  }
+}