new: Remove command to remove from queue!

src/main/java/codes/ztereohype/ztereomusic/command/commands/Remove.java

@@ -0,0 +1,85 @@
+package codes.ztereohype.ztereomusic.command.commands;
+
+import codes.ztereohype.ztereomusic.audio.TrackManager;
+import codes.ztereohype.ztereomusic.audio.TrackManagers;
+import codes.ztereohype.ztereomusic.command.Command;
+import codes.ztereohype.ztereomusic.command.CommandMeta;
+import codes.ztereohype.ztereomusic.command.permissions.VoiceChecks;
+import lombok.Getter;
+import net.dv8tion.jda.api.entities.Guild;
+import net.dv8tion.jda.api.entities.MessageChannel;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+public class Remove implements Command {
+    private @Getter final CommandMeta meta;
+
+    public Remove() {
+        this.meta = CommandMeta.builder()
+                .name("remove")
+                .aliases(new String[] {"delete"})
+                .description("Remove the chosen item.")
+                .isNsfw(false)
+                .isHidden(false)
+                .checks(new VoiceChecks[] { VoiceChecks.BOT_CONNECTED,
+                        VoiceChecks.BOT_PLAYING,
+                        VoiceChecks.USER_CONNECTED,
+                        VoiceChecks.SAME_VC_IF_CONNECTED })
+                .build();
+    }
+
+    @Override
+    public void execute(MessageReceivedEvent messageEvent, String[] args) {
+        Guild guild = messageEvent.getGuild();
+        MessageChannel messageChannel = messageEvent.getChannel();
+
+        // if there's the wrong amount of arguments send the usage
+        if (args.length != 1) {
+            messageChannel.sendMessage("Usage: `remove [index of song to remove]/first/last`. Use the `queue` command to find the index.").queue();
+            return;
+        }
+
+        TrackManager trackManager = TrackManagers.getGuildTrackManager(guild, messageChannel);
+        assert trackManager != null; // the command will not execute if it is anyway because of our VoiceChecks (BOT_PLAYING)
+
+        Map<String, Integer> indexAliases = new HashMap<>();
+        indexAliases.put("first", 1);
+        indexAliases.put("last", trackManager.trackQueue.size());
+
+        int parsedIndex;
+        String index = args[0];
+
+        // if there is an integer assume it's the index
+        if (isNumeric(index)) {
+            parsedIndex = Integer.parseInt(index);
+        // if there is a known string get the index from the map
+        } else if (indexAliases.containsKey(index.toLowerCase(Locale.ROOT))) {
+            parsedIndex = indexAliases.get(index);
+        } else {
+            messageChannel.sendMessage("Usage: `remove [index of song to remove]/first/last`. Use the `queue` command to find the index.").queue();
+            return;
+        }
+
+        if (parsedIndex > trackManager.trackQueue.size() || parsedIndex < 1) {
+            messageChannel.sendMessage("That index is out of bounds.").queue();
+            return;
+        }
+
+        trackManager.removeQueueItem(parsedIndex - 1);
+    }
+
+    public static boolean isNumeric(String strNum) {
+        if (strNum == null) {
+            return false;
+        }
+        try {
+            int i = Integer.parseInt(strNum);
+        } catch (NumberFormatException nfe) {
+            return false;
+        }
+        return true;
+    }
+}