WIP: add logic for joining the user's current voice channel.

src/main/java/moe/nekojimi/chords/commands/JoinCommand.java

@@ -6,11 +6,9 @@
 package moe.nekojimi.chords.commands;
 
 import java.util.List;
+import java.util.Optional;
 import moe.nekojimi.chords.Main;
-import net.dv8tion.jda.api.entities.Guild;
-import net.dv8tion.jda.api.entities.MessageChannel;
-import net.dv8tion.jda.api.entities.TextChannel;
-import net.dv8tion.jda.api.entities.VoiceChannel;
+import net.dv8tion.jda.api.entities.*;
 import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 public class JoinCommand extends Command
@@ -23,11 +21,26 @@ public class JoinCommand extends Command
 
     @Override
     public void call(GuildMessageReceivedEvent event, List<String> args)
+    {
+        TextChannel textChannel = event.getChannel();
+        VoiceChannel channel = null;
+        if (args.isEmpty() || args.get(0).isBlank())
+        {
+            GuildVoiceState voiceState = event.getMember().getVoiceState();
+            if (voiceState != null && voiceState.inVoiceChannel())
+                channel = voiceState.getChannel();
+            else
+            {
+                Guild guild = event.getMessage().getGuild();
+                List<VoiceChannel> voiceChannels = guild.getVoiceChannels();
+                Optional<VoiceChannel> findFirst = voiceChannels.stream().filter((t) -> !t.getMembers().isEmpty()).findFirst();
+                channel = findFirst.orElseThrow(() -> new RuntimeException("Cannot find any voice channels with people in!"));
+            }
+        } else
         {
             String arg0 = args.get(0);
             Guild guild = event.getGuild();
             boolean isNumber = arg0.matches("\\d+"); // This is a regular expression that ensures the input consists of digits
-        VoiceChannel channel = null;
             if (isNumber) // The input is an id?
                 channel = guild.getVoiceChannelById(arg0);
             if (channel == null)                    // Then the input must be a name?
@@ -37,12 +50,13 @@ public class JoinCommand extends Command
                     channel = channels.get(0);      // We found a channel! This cannot be null.
             }
 
-        TextChannel textChannel = event.getChannel();
             if (channel == null)                    // I have no idea what you want mr user
             {
                 onUnknownChannel(textChannel, arg0); // Let the user know about our failure
                 return;
             }
+
+        }
         bot.connectTo(channel);                     // We found a channel to connect to!
         onConnecting(channel, textChannel);     // Let the user know, we were successful!
     }