Add playlist playback support, loading & saving.

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(
@@ -125,11 +135,19 @@ public class Main extends ListenerAdapter
 
     };
 
-    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!");
     }
 
@@ -329,6 +350,35 @@ 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 +413,5 @@ 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 com.amihaiemil.eoyaml.YamlSequence;
-import java.util.List;
+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()
+    {
+        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)
     {
-        throw new UnsupportedOperationException("Not supported yet.");
+        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/TrackPlayer.java

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