pushed this, but it doesn't do anything, just to prevent errors in forks

NadekoBot/Commands/VoiceNotificationCommand.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Discord.Commands;
+using System.Collections.Concurrent;
+using Discord;
+
+namespace NadekoBot.Commands {
+    class VoiceNotificationCommand : DiscordCommand {
+
+
+        public VoiceNotificationCommand() : base() {
+            //NadekoBot.client.
+        }
+
+        //voicechannel/text channel
+        ConcurrentDictionary<Channel, Channel> subscribers = new ConcurrentDictionary<Channel, Channel>();
+
+        public override Func<CommandEventArgs, Task> DoFunc() => async e => {
+            var arg = e.GetArg("voice_name");
+            if (string.IsNullOrWhiteSpace("voice_name"))
+                return;
+            var voiceChannel = e.Server.FindChannels(arg, ChannelType.Voice).FirstOrDefault();
+            if (voiceChannel == null)
+                return;
+            if (subscribers.ContainsKey(voiceChannel)) {
+                await e.Channel.SendMessage("`Voice channel notifications disabled.`");
+                return;
+            }
+            if (subscribers.TryAdd(voiceChannel, e.Channel)) {
+                await e.Channel.SendMessage("`Voice channel notifications enabled.`");
+            }
+        };
+
+        public override void Init(CommandGroupBuilder cgb) {
+            /*
+            cgb.CreateCommand(".voicenotif")
+                  .Description("Enables notifications on who joined/left the voice channel.\n**Usage**:.voicenotif Karaoke club")
+                  .Parameter("voice_name", ParameterType.Unparsed)
+                  .Do(DoFunc());
+                  */
+        }
+    }
+}