Add SubCommand.tabComplete

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

@@ -21,10 +21,13 @@ package de.steamwar.command;
 
 import org.bukkit.command.CommandSender;
 
+import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Parameter;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.function.Function;
 
@@ -103,8 +106,33 @@ class SubCommand {
     }
 
     List<String> tabComplete(CommandSender commandSender, String[] args) {
-        // TODO: implement tabCompleting for SubCommand
-        return null;
+        List<String> argsList = Arrays.asList(args);
+        for (int i = 0; i < subCommand.length; i++) {
+            String s = argsList.remove(0);
+            if (argsList.isEmpty()) return Collections.singletonList(subCommand[i]);
+            if (!subCommand[i].equals(s)) return Collections.emptyList();
+        }
+        for (int i = 0; i < arguments.length; i++) {
+            String s = argsList.remove(0);
+            if (argsList.isEmpty()) return arguments[i].tabCompletes(s);
+            try {
+                arguments[i].map(s);
+            } catch (Exception e) {
+                return Collections.emptyList();
+            }
+        }
+        if (varArgs && !argsList.isEmpty()) {
+            while (!argsList.isEmpty()) {
+                String s = argsList.remove(0);
+                if (argsList.isEmpty()) return arguments[arguments.length - 1].tabCompletes(s);
+                try {
+                    arguments[arguments.length - 1].map(s);
+                } catch (Exception e) {
+                    return Collections.emptyList();
+                }
+            }
+        }
+        return Collections.emptyList();
     }
 
 }