add Command description

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

@@ -9,6 +9,8 @@ public @interface Command {
 
     String usage() default "No usage specified";
 
+    String description() default "No description specified";
+
     String[] aliases() default {};
 
     String permission() default "";

src/main/java/emu/grasscutter/command/CommandHandler.java

@@ -7,7 +7,7 @@ import java.util.List;
 
 public interface CommandHandler {
 
-    String description();
+    default String description() { return null; };
 
     /**
      * Send a message to the target.

src/main/java/emu/grasscutter/command/commands/HelpCommand.java

@@ -43,7 +43,7 @@ public final class HelpCommand implements CommandHandler {
             } else {
                 Command annotation = handler.getClass().getAnnotation(Command.class);
 
-                builder.append("   ").append(handler.description()).append("\n");
+                builder.append("   ").append(handler.description() == null ? annotation.description(): handler.description()).append("\n");
                 builder.append(translate("commands.help.usage")).append(annotation.usage());
                 if (annotation.aliases().length >= 1) {
                     builder.append("\n").append(translate("commands.help.aliases"));
@@ -65,7 +65,7 @@ public final class HelpCommand implements CommandHandler {
             StringBuilder builder = new StringBuilder("\n" + translate("commands.help.available_commands") + "\n");
             annotations.forEach((annotation, handler) -> {
                 builder.append(annotation.label()).append("\n");
-                builder.append("   ").append(handler.description()).append("\n");
+                builder.append("   ").append(handler.description() == null ? annotation.description() : handler.description()).append("\n");
                 builder.append(translate("commands.help.usage")).append(annotation.usage());
                 if (annotation.aliases().length >= 1) {
                     builder.append("\n").append(translate("commands.help.aliases"));
@@ -82,7 +82,7 @@ public final class HelpCommand implements CommandHandler {
             CommandHandler.sendMessage(player, translate("commands.help.available_commands"));
             annotations.forEach((annotation, handler) -> {
                 StringBuilder builder = new StringBuilder(annotation.label()).append("\n");
-                builder.append("   ").append(handler.description()).append("\n");
+                builder.append("   ").append(handler.description() == null ? annotation.description() : handler.description()).append("\n");
                 builder.append(translate("commands.help.usage")).append(annotation.usage());
                 if (annotation.aliases().length >= 1) {
                     builder.append("\n").append(translate("commands.help.aliases"));

src/main/java/emu/grasscutter/tools/Tools.java

@@ -121,7 +121,7 @@ final class ToolsWithLanguageOption {
 				while (cmdName.length() <= 15) {
 					cmdName = " " + cmdName;
 				}
-				writer.println(cmdName + " : " + handler.description());
+				writer.println(cmdName + " : " + (handler.description() == null ? command.description() : handler.description()));
 			});
 			writer.println();