Grasscutter/src/main/java/emu/grasscutter/command/commands/KillAllCommand.java

package emu.grasscutter.command.commands;

import emu.grasscutter.command.Command;
import emu.grasscutter.command.CommandHandler;
import emu.grasscutter.game.entity.EntityMonster;
import emu.grasscutter.game.entity.GameEntity;
import emu.grasscutter.game.player.Player;
import emu.grasscutter.game.world.Scene;

import java.util.List;

import static emu.grasscutter.utils.Language.translate;

@Command(label = "killall", usage = {"[<sceneId>]"}, permission = "server.killall", permissionTargeted = "server.killall.others")
public final class KillAllCommand implements CommandHandler {

    @Override
    public void execute(Player sender, Player targetPlayer, List<String> args) {
        Scene scene = targetPlayer.getScene();
        try {
            switch (args.size()) {
                case 0: // *No args*
                    break;
                case 1: // [sceneId]
                    scene = targetPlayer.getWorld().getSceneById(Integer.parseInt(args.get(0)));
                    break;
                default:
                    sendUsageMessage(sender);
                    return;
            }
        } catch (NumberFormatException ignored) {
            CommandHandler.sendMessage(sender, translate(sender, "commands.execution.argument_error"));
        }
        if (scene == null) {
            CommandHandler.sendMessage(sender, translate(sender, "commands.killall.scene_not_found_in_player_world"));
            return;
        }

        // Separate into list to avoid concurrency issue
        final Scene sceneF = scene;
        List<GameEntity> toKill = sceneF.getEntities().values().stream()
            .filter(entity -> entity instanceof EntityMonster)
            .toList();
        toKill.forEach(entity -> sceneF.killEntity(entity, 0));
        CommandHandler.sendMessage(sender, translate(sender, "commands.killall.kill_monsters_in_scene", toKill.size(), scene.getId()));
    }
}