Add tab completion

bungee/src/main/java/me/lucko/luckperms/MainCommand.java

@@ -5,11 +5,12 @@ import me.lucko.luckperms.commands.Sender;
 import net.md_5.bungee.api.CommandSender;
 import net.md_5.bungee.api.chat.TextComponent;
 import net.md_5.bungee.api.plugin.Command;
+import net.md_5.bungee.api.plugin.TabExecutor;
 
 import java.lang.ref.WeakReference;
 import java.util.Arrays;
 
-class MainCommand extends Command {
+class MainCommand extends Command implements TabExecutor {
     private final CommandManager manager;
 
     public MainCommand(CommandManager manager) {
@@ -20,8 +21,18 @@ class MainCommand extends Command {
 
     @Override
     public void execute(CommandSender sender, String[] args) {
-        final WeakReference<CommandSender> cs = new WeakReference<>(sender);
-        manager.onCommand(new Sender() {
+        manager.onCommand(makeSender(sender), Arrays.asList(args));
+    }
+
+    @Override
+    public Iterable<String> onTabComplete(CommandSender sender, String[] args) {
+        return manager.onTabComplete(makeSender(sender), Arrays.asList(args));
+    }
+
+    private static Sender makeSender(CommandSender sender) {
+        return new Sender() {
+            final WeakReference<CommandSender> cs = new WeakReference<>(sender);
+
             @Override
             public void sendMessage(String s) {
                 final CommandSender c = cs.get();
@@ -35,6 +46,6 @@ class MainCommand extends Command {
                 final CommandSender c = cs.get();
                 return c != null && c.hasPermission(node);
             }
-        }, Arrays.asList(args));
+        };
     }
 }