Add new invocation system to command structure.

src/main/java/moe/nekojimi/chords/Main.java

@@ -5,22 +5,27 @@
  */
 package moe.nekojimi.chords;
 
+import com.amihaiemil.eoyaml.Yaml;
+import com.amihaiemil.eoyaml.YamlMapping;
 import java.io.File;
+import java.io.FilenameFilter;
+import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.nio.file.Files;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.*;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.security.auth.login.LoginException;
 import moe.nekojimi.chords.commands.*;
-import moe.nekojimi.musicsearcher.Result;
 import moe.nekojimi.musicsearcher.providers.MetaSearcher;
 import moe.nekojimi.musicsearcher.providers.Searcher;
 import net.dv8tion.jda.api.JDA;
 import net.dv8tion.jda.api.JDABuilder;
-import net.dv8tion.jda.api.MessageBuilder;
 import net.dv8tion.jda.api.entities.*;
 import net.dv8tion.jda.api.events.guild.voice.GuildVoiceLeaveEvent;
 import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
@@ -34,9 +39,12 @@ import net.dv8tion.jda.api.utils.cache.CacheFlag;
  *
  * @author jimj316
  */
-public class Main extends ListenerAdapter
+public final class Main extends ListenerAdapter
 {
 
+    private final File dataDirectory;
+    private final File playlistsDirectory;
+
     private MusicHandler musicHandler;
     private final Downloader downloader;
     private final Searcher searcher;
@@ -51,10 +59,12 @@ public class Main extends ListenerAdapter
 
     private int trackNumber = 1;
 
+    private final Map<String, Playlist> playlists = new HashMap<>();
+
     /**
      * @param args the command line arguments
      */
-    public static void main(String[] args) throws LoginException
+    public static void main(String[] args) throws LoginException, IOException
     {
         // We only need 2 gateway intents enabled for this example:
         EnumSet<GatewayIntent> intents = EnumSet.of(
@@ -100,7 +110,7 @@ public class Main extends ListenerAdapter
         if (ex == null)
             if (song.getLocation() != null)
             {
-                request.respond("Finished downloading " + song + ", added to queue!");
+                request.getInvocation().respond("Finished downloading " + song + ", added to queue!");
                 log("DOWN", "Downloaded " + song);
             } else
             {
@@ -114,22 +124,30 @@ public class Main extends ListenerAdapter
                     String bitFmt = (bitrate <= 0 ? "??" : bitrate) + "k";
                     formatDetails = " (" + bitFmt + ", " + sizeFmt + ")";
                 }
-                request.respond("Now downloading " + song + formatDetails + " ...");
+                request.getInvocation().respond("Now downloading " + song + formatDetails + " ...");
                 log("DOWN", "Downloading " + song + "...");
             }
         else
         {
-            request.respond("Failed to download " + song + "! Reason: " + ex.getMessage());
+            request.getInvocation().respond("Failed to download " + song + "! Reason: " + ex.getMessage());
             log("DOWN", "Failed to download " + song + "! Reason: " + ex.getMessage());
         }
 
     };
 
-    public Main()
+    public Main() throws IOException
     {
         log("INFO", "Starting up...");
+
+        // init dirs
+        dataDirectory = new File(System.getProperty("user.dir"));
+        playlistsDirectory = initDirectory(dataDirectory, "playlists");
+
+        // init downloader
         downloader = new Downloader();
         downloader.setMessageHandler(downloaderMessageHandler);
+
+        // init searcher
         searcher = MetaSearcher.loadYAML(new File("searchproviders.yml"));
 
         // init queue manager
@@ -147,6 +165,9 @@ public class Main extends ListenerAdapter
         helpCommand = new HelpCommand(this);
         addCommand(helpCommand);
 
+        // load playlists
+        loadPlaylists();
+
         log("INFO", "Started OK!");
     }
 
@@ -195,7 +216,7 @@ public class Main extends ListenerAdapter
         try
         {
             URL parseURL = new URL(content.trim());
-            playCommand.call(event, List.of(parseURL.toExternalForm()));
+            playCommand.call(null);
         } catch (MalformedURLException ex)
         {
             // not a URL, then
@@ -203,7 +224,7 @@ public class Main extends ListenerAdapter
 
         try
         {
-            String[] split = content.split("\\s+", 2);
+            String[] split = content.split("\\s+");
             String cmd = split[0].toLowerCase();
 
             if (!cmd.startsWith("!"))
@@ -211,17 +232,21 @@ public class Main extends ListenerAdapter
 
             cmd = cmd.substring(1); // strip prefix char
 
-            String arg = "";
-            if (split.length > 1)
-                arg = split[1];
+//            String arg = "";
+            List<String> args = new ArrayList<>();
+            Collections.addAll(args, split);
+            args.remove(0);
+
+            Invocation invocation = new Invocation(event, args);
+            invocation.setRequestMessage(message);
 
             if (commands.containsKey(cmd))
             {
                 Command command = commands.get(cmd);
-                command.call(event, List.of(arg));
+                command.call(invocation);
             } else
             {
-                helpCommand.call(event, List.of(arg));
+                helpCommand.call(invocation);
             }
         } catch (Exception ex)
         {
@@ -241,16 +266,16 @@ public class Main extends ListenerAdapter
             // interpret search result
             throw new UnsupportedOperationException("Not supported yet.");
         }
-        if (request.getRequestMessage() != null)
+        if (request.getInvocation().getRequestMessage() != null)
         {
-            song.setRequestedBy(request.getRequestMessage().getAuthor().getName());
-            song.setRequestedIn(request.getRequestMessage().getChannel().getId());
+            song.setRequestedBy(request.getInvocation().getRequestMessage().getAuthor().getName());
+            song.setRequestedIn(request.getInvocation().getRequestMessage().getChannel().getId());
         }
         song.setNumber(trackNumber);
         trackNumber++;
         request.setSong(song);
         downloader.accept(new Downloader.DownloadTask(request, queueManager));
-        request.respond("Request pending...");
+        request.getInvocation().respond("Request pending...");
         return song;
     }
 
@@ -329,6 +354,35 @@ public class Main extends ListenerAdapter
         System.out.println(type + " " + LocalDateTime.now().format(DateTimeFormatter.ISO_DATE_TIME) + "\t" + message);
     }
 
+    public File initDirectory(File parent, String name) throws IOException
+    {
+        File ret = new File(parent, name);
+        if (!ret.exists())
+            Files.createDirectories(ret.toPath());
+        if (!ret.canRead())
+            throw new RuntimeException("Cannot read directory " + ret.getAbsolutePath() + "!");
+        if (!ret.canWrite())
+            throw new RuntimeException("Cannot write to directory " + ret.getAbsolutePath() + "!");
+        return ret;
+    }
+
+    private void loadPlaylists()
+    {
+        File[] files = playlistsDirectory.listFiles((File file, String name) -> name.endsWith(".yaml"));
+        for (File file : files)
+        {
+            try
+            {
+                YamlMapping map = Yaml.createYamlInput(file).readYamlMapping();
+                Playlist playlist = Playlist.fromYaml(map);
+                playlists.put(playlist.getName(), playlist);
+            } catch (IOException ex)
+            {
+                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        }
+    }
+
     public MusicHandler getMusicHandler()
     {
         return musicHandler;
@@ -363,4 +417,5 @@ public class Main extends ListenerAdapter
         return trackNumber;
     }
 
+
 }

src/main/java/moe/nekojimi/chords/Playlist.java

@@ -16,19 +16,28 @@
  */
 package moe.nekojimi.chords;
 
+import com.amihaiemil.eoyaml.Yaml;
 import com.amihaiemil.eoyaml.YamlMapping;
-import java.util.ArrayList;
-import java.util.List;
+import com.amihaiemil.eoyaml.YamlSequence;
+import com.amihaiemil.eoyaml.YamlSequenceBuilder;
+import java.net.MalformedURLException;
+import java.util.*;
+import java.util.function.Consumer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  *
  * @author jimj316
  */
-public class Playlist
+public class Playlist implements Consumer<Song>
 {
 
+    private static final int SHUFFLE_DONT_REPEAT_LAST = 3;
+
     private final String name;
     private final List<Song> songs = new ArrayList<>();
+    private final LinkedList<Song> playHistory = new LinkedList<>();
 
     public Playlist(String name)
     {
@@ -37,12 +46,31 @@ public class Playlist
 
     public YamlMapping toYaml()
     {
-        throw new UnsupportedOperationException("Not supported yet.");
+        YamlSequenceBuilder songList = Yaml.createYamlSequenceBuilder();
+        for (Song song : songs)
+            songList = songList.add(song.toYaml());
+
+        return Yaml.createYamlMappingBuilder()
+                .add("name", name)
+                .add("songs", songList.build())
+                .build();
     }
 
     public static Playlist fromYaml(YamlMapping yaml)
     {
-        throw new UnsupportedOperationException("Not supported yet.");
+        Playlist ret = new Playlist(yaml.string("name"));
+        YamlSequence songList = yaml.value("songs").asSequence();
+        for (int i = 0; i < songList.size(); i++)
+        {
+            try
+            {
+                ret.addSong(Song.fromYaml(songList.yamlMapping(i)));
+            } catch (MalformedURLException ex)
+            {
+                Logger.getLogger(Playlist.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        }
+        return ret;
     }
 
     public void addSong(Song song)
@@ -61,9 +89,34 @@ public class Playlist
         return songs;
     }
 
-    Song getNextSong()
+    public Song getNextSong()
     {
-        throw new UnsupportedOperationException("Not supported yet.");
+        Song ret;
+
+        // copy the song list
+        List<Song> toShuffle = new LinkedList<>(songs);
+
+        // remove play history from candidates, latest first, unless we'd have less than 2 options
+        for (int i = playHistory.size() - 1; i >= 0; i--)
+        {
+            if (toShuffle.size() <= 2)
+                break;
+            toShuffle.remove(playHistory.get(i));
+        }
+
+        Collections.shuffle(toShuffle);
+        ret = toShuffle.get(0);
+
+        playHistory.add(ret);
+        if (playHistory.size() > SHUFFLE_DONT_REPEAT_LAST)
+            playHistory.remove();
+        return ret;
+    }
+
+    @Override
+    public void accept(Song t)
+    {
+        addSong(t);
     }
 
 }

src/main/java/moe/nekojimi/chords/QueueManager.java

@@ -26,8 +26,6 @@ import java.util.function.Consumer;
  */
 public class QueueManager implements Consumer<Song>
 {
-
-    private Mode mode;
     private final Queue<Song> jukeboxQueue;
     private Playlist playlist;
     private MusicHandler handler;
@@ -118,24 +116,8 @@ public class QueueManager implements Consumer<Song>
         this.playlist = playlist;
     }
 
-    public Mode getMode()
-    {
-        return mode;
-    }
-
-    public void setMode(Mode mode)
-    {
-        this.mode = mode;
-    }
-
     public boolean restartSong()
     {
         throw new UnsupportedOperationException("Not supported yet.");
     }
-
-    public enum Mode
-    {
-        JUKEBOX,
-        PLAYLIST;
-    }
 }

src/main/java/moe/nekojimi/chords/Song.java

@@ -60,6 +60,7 @@ public class Song
     {
         Song song = new Song(new URL(map.string("url")));
         song.setArtist(map.string("artist"));
+        song.setTitle(map.string("title"));
         song.setLocation(new File(map.string("location")));
         song.setNumber(map.integer("num"));
         song.setKept(Boolean.parseBoolean(map.string("kept")));

src/main/java/moe/nekojimi/chords/SongRequest.java

@@ -18,11 +18,8 @@ package moe.nekojimi.chords;
 
 import java.net.URL;
 import java.util.List;
+import moe.nekojimi.chords.commands.Invocation;
 import moe.nekojimi.musicsearcher.Result;
-import net.dv8tion.jda.api.MessageBuilder;
-import net.dv8tion.jda.api.entities.Message;
-import net.dv8tion.jda.api.requests.restaction.MessageAction;
-import net.dv8tion.jda.internal.entities.DataMessage;
 
 /**
  *
@@ -30,9 +27,7 @@ import net.dv8tion.jda.internal.entities.DataMessage;
  */
 public class SongRequest
 {
-
-    private Message requestMessage;
-    private Message responseMessage;
+    private Invocation invocation;
 
     private String query;
     private URL url;
@@ -43,21 +38,6 @@ public class SongRequest
 
     private Song song;
 
-    @SuppressWarnings("null")
-    public void respond(String text)
-    {
-        MessageAction action = null;
-
-        if (responseMessage == null)
-        {
-            action = requestMessage.reply(text);
-        } else
-        {
-            action = responseMessage.editMessage(text);
-        }
-
-        responseMessage = action.complete();
-    }
 
 
     public List<Result> getSearchResults()
@@ -80,25 +60,35 @@ public class SongRequest
         this.result = result;
     }
 
-    public Message getRequestMessage()
+    public Invocation getInvocation()
     {
-        return requestMessage;
+        return invocation;
     }
 
-    public void setRequestMessage(Message requestMessage)
+    public void setInvocation(Invocation invocation)
     {
-        this.requestMessage = requestMessage;
+        this.invocation = invocation;
     }
 
-    public Message getResponseMessage()
-    {
-        return responseMessage;
-    }
-
-    public void setResponseMessage(Message responseMessage)
-    {
-        this.responseMessage = responseMessage;
-    }
+//    public Message getRequestMessage()
+//    {
+//        return requestMessage;
+//    }
+//
+//    public void setRequestMessage(Message requestMessage)
+//    {
+//        this.requestMessage = requestMessage;
+//    }
+//
+//    public Message getResponseMessage()
+//    {
+//        return responseMessage;
+//    }
+//
+//    public void setResponseMessage(Message responseMessage)
+//    {
+//        this.responseMessage = responseMessage;
+//    }
 
     public String getQuery()
     {

src/main/java/moe/nekojimi/chords/TrackPlayer.java

@@ -132,7 +132,7 @@ public class TrackPlayer implements Closeable
 
     public void close() throws IOException
     {
-        input.close();
+        input.close(); //q
     }
 
 

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

@@ -5,9 +5,7 @@
  */
 package moe.nekojimi.chords.commands;
 
-import java.util.List;
 import moe.nekojimi.chords.Main;
-import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 /**
  *
@@ -26,7 +24,7 @@ public abstract class Command
         this.keyword = keyword;
     }
 
-    public abstract void call(GuildMessageReceivedEvent event, List<String> arg);
+    public abstract void call(Invocation invocation);
 
     public String getKeyword()
     {

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

@@ -16,9 +16,7 @@
  */
 package moe.nekojimi.chords.commands;
 
-import java.util.List;
 import moe.nekojimi.chords.Main;
-import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 public class HelpCommand extends Command
 {
@@ -29,7 +27,7 @@ public class HelpCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> arg)
+    public void call(Invocation invocation)
     {
         String help = "Commands available:\n"
                 + "!join <Channel>       - Joins a voice channel\n"
@@ -44,7 +42,7 @@ public class HelpCommand extends Command
 //        {
 //            help += "!" + key + ":"
 //        }
-        event.getChannel().sendMessage(help).queue();
+        invocation.respond(help);
     }
 
 }

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

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2022 jimj316
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package moe.nekojimi.chords.commands;
+
+import java.util.List;
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
+import net.dv8tion.jda.api.requests.restaction.MessageAction;
+
+/**
+ *
+ * @author jimj316
+ */
+public class Invocation
+{
+
+    private Message requestMessage;
+    private Message responseMessage;
+
+    private final GuildMessageReceivedEvent event;
+    private final List<String> args;
+
+    public Invocation(GuildMessageReceivedEvent event, List<String> args)
+    {
+        this.event = event;
+        this.args = args;
+    }
+
+    public GuildMessageReceivedEvent getEvent()
+    {
+        return event;
+    }
+
+    public List<String> getArgs()
+    {
+        return args;
+    }
+
+    @SuppressWarnings("null")
+    public void respond(String text)
+    {
+        MessageAction action = null;
+
+        if (responseMessage == null)
+        {
+            action = requestMessage.reply(text);
+        } else
+        {
+            action = responseMessage.editMessage(text);
+        }
+
+        responseMessage = action.complete();
+    }
+
+    public Message getRequestMessage()
+    {
+        return requestMessage;
+    }
+
+    public void setRequestMessage(Message requestMessage)
+    {
+        this.requestMessage = requestMessage;
+    }
+
+    public Message getResponseMessage()
+    {
+        return responseMessage;
+    }
+
+    public void setResponseMessage(Message responseMessage)
+    {
+        this.responseMessage = responseMessage;
+    }
+
+}

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

@@ -6,7 +6,6 @@
 package moe.nekojimi.chords.commands;
 
 import java.util.List;
-import java.util.Optional;
 import moe.nekojimi.chords.Main;
 import net.dv8tion.jda.api.entities.*;
 import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
@@ -20,8 +19,10 @@ public class JoinCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> args)
+    public void call(Invocation invocation)
     {
+        GuildMessageReceivedEvent event = invocation.getEvent();
+        List<String> args = invocation.getArgs();
         TextChannel textChannel = event.getChannel();
         VoiceChannel channel = null;
         if (args.isEmpty() || args.get(0).isBlank())

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

@@ -18,7 +18,7 @@ public class LeaveCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> arg)
+    public void call(Invocation invocation)
     {
         if (bot.getCurrentVoiceChannel() != null)
         {

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

@@ -25,7 +25,6 @@ import moe.nekojimi.chords.Main;
 import moe.nekojimi.chords.SongRequest;
 import moe.nekojimi.musicsearcher.Query;
 import moe.nekojimi.musicsearcher.Result;
-import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 /**
  *
@@ -44,13 +43,13 @@ public class PlayCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> arg)
+    public void call(Invocation invocation)
     {
         SongRequest request = new SongRequest();
-        request.setRequestMessage(event.getMessage());
+        request.setInvocation(invocation);
         try
         {
-            final URL url = new URL(arg.get(0));
+            final URL url = new URL(invocation.getArgs().get(0));
             request.setUrl(url);
             bot.queueDownload(request);
 
@@ -61,7 +60,7 @@ public class PlayCommand extends Command
             {
                 try
                 {
-                    int index = Integer.parseInt(arg.get(0));
+                    int index = Integer.parseInt(invocation.getArgs().get(0));
                     int size = request.getSearchResults().size();
                     if (index >= 1 && index <= size)
                     {
@@ -70,9 +69,9 @@ public class PlayCommand extends Command
                         bot.queueDownload(request);
 //                        event.getChannel().sendMessage("Song removed.").queue();
                     } else if (size > 1)
-                        event.getChannel().sendMessage("That's not a number between 1 and " + size + "!").queue();
+                        invocation.respond("That's not a number between 1 and " + size + "!");
                     else if (size == 1)
-                        event.getChannel().sendMessage("There's only one song and that's not one of them!").queue();
+                        invocation.respond("There's only one song and that's not one of them!");
 
                     return;
                 } catch (NumberFormatException nfx)
@@ -82,13 +81,13 @@ public class PlayCommand extends Command
             }
 
             // otherwise, try searching
-            CompletableFuture<List<Result>> search = bot.getSearcher().search(Query.fullText(arg.stream().reduce((t, u) -> t + " " + u).get()));
-            event.getChannel().sendMessage("Searching for \"" + arg + "\" ...").queue();
+            CompletableFuture<List<Result>> search = bot.getSearcher().search(Query.fullText(invocation.getArgs().stream().reduce((t, u) -> t + " " + u).get()));
+            invocation.respond("Searching for \"" + invocation.getArgs() + "\" ...");
             search.orTimeout(30, TimeUnit.SECONDS).whenCompleteAsync((List<Result> results, Throwable exec) ->
             {
                 if (exec != null)
                 {
-                    event.getChannel().sendMessage("Failed to search! Reason: " + exec.getMessage()).queue();
+                    invocation.respond("Failed to search! Reason: " + exec.getMessage());
                     return;
                 }
 
@@ -97,7 +96,7 @@ public class PlayCommand extends Command
 
                 if (results.isEmpty())
                 {
-                    event.getChannel().sendMessage("Found nothing! :(").queue();
+                    invocation.respond("Found nothing! :(");
                     return;
                 }
 
@@ -125,7 +124,7 @@ public class PlayCommand extends Command
                     i++;
                 }
                 resultString += "Type eg. `!play 1` to select";
-                event.getChannel().sendMessage(resultString).queue();
+                invocation.respond(resultString);
             });
 //            event.getChannel().sendMessage("That's not a valid URL you idiot! " + ex.getMessage()).queue();
         }

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

@@ -21,7 +21,6 @@ import java.util.Queue;
 import moe.nekojimi.chords.Downloader;
 import moe.nekojimi.chords.Main;
 import moe.nekojimi.chords.Song;
-import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 public class QueueCommand extends Command
 {
@@ -32,7 +31,7 @@ public class QueueCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> arg)
+    public void call(Invocation invocation)
     {
         String message = ">>> ";
         int i = 1;
@@ -68,7 +67,7 @@ public class QueueCommand extends Command
         if (downloadQueue.isEmpty() && songQueue.isEmpty())
             message += ":mailbox_with_no_mail: The track queue is empty.";
         // :inbox_tray:
-        event.getChannel().sendMessage(message).queue();
+        invocation.respond(message);
     }
 
 }

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

@@ -16,9 +16,7 @@
  */
 package moe.nekojimi.chords.commands;
 
-import java.util.List;
 import moe.nekojimi.chords.Main;
-import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 public class RemoveCommand extends Command
 {
@@ -29,23 +27,23 @@ public class RemoveCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> arg)
+    public void call(Invocation invocation)
     {
         try
         {
-            int i = Integer.parseInt(arg.get(0));
+            int i = Integer.parseInt(invocation.getArgs().get(0));
             boolean removed = bot.getQueueManager().removeSong(i - 1);
             final int size = bot.getQueueManager().getJukeboxQueue().size();
             if (removed)
-                event.getChannel().sendMessage("Song removed.").queue();
+                invocation.respond("Song removed.");
             else if (size > 1)
-                event.getChannel().sendMessage("That's not a number between 1 and " + size + "!").queue();
+                invocation.respond("That's not a number between 1 and " + size + "!");
             else if (size == 1)
-                event.getChannel().sendMessage("There's only one song to remove and that's not one of them!").queue();
+                invocation.respond("There's only one song to remove and that's not one of them!");
 
         } catch (NumberFormatException ex)
         {
-            event.getChannel().sendMessage(arg + " isn't a number!").queue();
+            invocation.respond(invocation.getArgs().get(0) + " isn't a number!");
         }
     }
 

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

@@ -16,9 +16,7 @@
  */
 package moe.nekojimi.chords.commands;
 
-import java.util.List;
 import moe.nekojimi.chords.Main;
-import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 public class RestartCommand extends Command
 {
@@ -29,14 +27,14 @@ public class RestartCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> arg)
+    public void call(Invocation invocation)
     {
         // TODO: this needs to clear the current data queue
         boolean ok = bot.getQueueManager().restartSong();
         if (ok)
-            event.getChannel().sendMessage("Restarted current song!").queue();
+            invocation.respond("Restarted current song!");
         else
-            event.getChannel().sendMessage("Cannot restart!").queue();
+            invocation.respond("Cannot restart!");
     }
 
 }

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

@@ -16,9 +16,7 @@
  */
 package moe.nekojimi.chords.commands;
 
-import java.util.List;
 import moe.nekojimi.chords.Main;
-import net.dv8tion.jda.api.events.message.guild.GuildMessageReceivedEvent;
 
 public class SkipCommand extends Command
 {
@@ -29,13 +27,13 @@ public class SkipCommand extends Command
     }
 
     @Override
-    public void call(GuildMessageReceivedEvent event, List<String> arg)
+    public void call(Invocation invocation)
     {
         boolean ok = bot.getMusicHandler().nextSong(true);
         if (ok)
-            event.getChannel().sendMessage("Skipped to next song!").queue();
+            invocation.respond("Skipped to next song!");
         else
-            event.getChannel().sendMessage("There's no more songs!").queue();
+            invocation.respond("There's no more songs!");
     }
 
 }