Add SWCommand.subCommandTabCompletes

SpigotCore_Main/src/de/steamwar/command/SWCommand.java

@@ -35,6 +35,7 @@ public abstract class SWCommand {
 
     private final Set<InternalCommand> commandSet = new HashSet<>();
     private final Set<InternalTabComplete> tabCompleteSet = new HashSet<>();
+    private final Map<Integer, Set<String>> subCommandTabCompletes = new HashMap<>();
     private Consumer<CommandSender> helpMessage = sender -> {};
 
     protected SWCommand(String command) {
@@ -55,19 +56,30 @@ public abstract class SWCommand {
 
             @Override
             public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
-                List<String> strings = new ArrayList<>();
+                List<String> strings = new ArrayList<>(subCommandTabCompletes.getOrDefault(args.length, new HashSet<>()));
                 for (InternalTabComplete internalTabComplete : tabCompleteSet) {
                     SWCommandUtils.TabComplete tabComplete = internalTabComplete.invoke(sender, args);
                     if (tabComplete != null) {
                         strings.addAll(tabComplete.tabCompletes);
                     }
                 }
+                strings = new ArrayList<>(strings);
+                for (int i = strings.size() - 1; i >= 0; i--) {
+                    if (!strings.get(i).startsWith(args[args.length - 1])) {
+                        strings.remove(i);
+                    }
+                }
                 return strings;
             }
         });
 
         for (Method method : getClass().getDeclaredMethods()) {
-            if (method.getDeclaredAnnotation(Register.class) == null) continue;
+            Register register = method.getDeclaredAnnotation(Register.class);
+            if (register == null) continue;
+            for (int i = 0; i < register.subCommand().length; i++) {
+                subCommandTabCompletes.computeIfAbsent(i, integer -> new HashSet<>()).add(register.subCommand()[i]);
+            }
+
             if (!validMethod(method)) continue;
             if (method.getReturnType() == Void.TYPE) {
                 commandSet.add(new InternalCommand(this, method));