Fix registering error & implement handling

src/main/java/emu/grasscutter/Grasscutter.java

@@ -16,7 +16,6 @@ import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 
 import ch.qos.logback.classic.Logger;
-import emu.grasscutter.commands.ServerCommands;
 import emu.grasscutter.data.ResourceLoader;
 import emu.grasscutter.database.DatabaseManager;
 import emu.grasscutter.server.dispatch.DispatchServer;
@@ -103,7 +102,11 @@ public final class Grasscutter {
 		String input;
 		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
 			while ((input = br.readLine()) != null) {
-				CommandMap.getInstance().invoke(null, input);
+				try {
+					CommandMap.getInstance().invoke(null, input);
+				} catch (Exception e) {
+					Grasscutter.getLogger().error("Command error: " + e.getMessage());
+				}
 			}
 		} catch (Exception e) {
 			Grasscutter.getLogger().error("An error occurred.", e);

src/main/java/emu/grasscutter/commands/Command.java

@@ -7,7 +7,7 @@ import java.lang.annotation.RetentionPolicy;
 public @interface Command {
 	String label() default "";
 	
-	String[] aliases() default "";
+	String[] aliases() default {""};
 	
 	int gmLevel() default 1;
 	

src/main/java/emu/grasscutter/commands/CommandMap.java

@@ -21,7 +21,15 @@ public final class CommandMap {
      * @return Instance chaining.
      */
     public CommandMap registerCommand(String label, CommandHandler command) {
-        this.commands.put(label, command); return this;
+        Grasscutter.getLogger().debug("Registered command: " + label);
+        
+        Command annotation = command.getClass().getAnnotation(Command.class);
+        if(annotation.aliases().length > 0) {
+            for (String alias : annotation.aliases())
+                this.commands.put(alias, command);
+        } this.commands.put(label, command);
+        
+        return this;
     }
 
     /**
@@ -30,7 +38,17 @@ public final class CommandMap {
      * @return Instance chaining.
      */
     public CommandMap unregisterCommand(String label) {
-        this.commands.remove(label); return this;
+        Grasscutter.getLogger().debug("Unregistered command: " + label);
+        CommandHandler handler = this.commands.get(label);
+        if(handler == null) return this;
+        
+        Command annotation = handler.getClass().getAnnotation(Command.class);
+        if(annotation.aliases().length > 0) {
+            for (String alias : annotation.aliases())
+                this.commands.remove(alias);
+        } this.commands.remove(label); 
+        
+        return this;
     }
 
     /**
@@ -39,13 +57,18 @@ public final class CommandMap {
      * @param rawMessage The messaged used to invoke the command.
      */
     public void invoke(GenshinPlayer player, String rawMessage) {
+        rawMessage = rawMessage.trim();
+        if(rawMessage.length() == 0) {
+            CommandHandler.sendMessage(player, "No command specified.");
+        }
+        
         // Remove prefix if present.
         if(!Character.isLetter(rawMessage.charAt(0)))
             rawMessage = rawMessage.substring(1);
         
         // Parse message.
         String[] split = rawMessage.split(" ");
-        List<String> args = Arrays.asList(split);
+        List<String> args = new LinkedList<>(Arrays.asList(split));
         String label = args.remove(0);
         
         // Get command handler.
@@ -73,15 +96,17 @@ public final class CommandMap {
      */
     private void scan() {
         Reflections reflector = Grasscutter.reflector;
-        Set<?> classes = reflector.getTypesAnnotatedWith(Command.class);
+        Set<Class<?>> classes = reflector.getTypesAnnotatedWith(Command.class);
         classes.forEach(annotated -> {
             try {
-                Class<?> cls = annotated.getClass();
-                Command cmdData = cls.getAnnotation(Command.class);
-                Object object = cls.getDeclaredConstructors()[0].newInstance();
+                Command cmdData = annotated.getAnnotation(Command.class);
+                Object object = annotated.newInstance();
                 if (object instanceof CommandHandler)
                     this.registerCommand(cmdData.label(), (CommandHandler) object);
-            } catch (Exception ignored) { }
+                else Grasscutter.getLogger().error("Class " + annotated.getName() + " is not a CommandHandler!");
+            } catch (Exception exception) {
+                Grasscutter.getLogger().error("Failed to register command handler for " + annotated.getSimpleName(), exception);
+            }
         });
     }
 }

src/main/java/emu/grasscutter/game/managers/ChatManager.java

 package emu.grasscutter.game.managers;
 
 import emu.grasscutter.commands.CommandMap;
-import emu.grasscutter.commands.PlayerCommands;
 import emu.grasscutter.game.GenshinPlayer;
 import emu.grasscutter.net.packet.GenshinPacket;
 import emu.grasscutter.server.game.GameServer;