minecraft-tweaks-2a03/src/main/java/party/_2a03/mc/mixin/MixinGameModeCommand.java

package party._2a03.mc.mixin;

import java.util.Collection;
import com.mojang.brigadier.context.CommandContext;
import net.minecraft.server.command.ServerCommandSource;
import net.minecraft.server.command.GameModeCommand;
import net.minecraft.server.network.ServerPlayerEntity;
import net.minecraft.text.Text;
import net.minecraft.world.GameMode;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;

@Mixin(GameModeCommand.class)
public class MixinGameModeCommand {
	@Inject(method = "execute", at = @At("HEAD"))
	private static void OnExecute(CommandContext<ServerCommandSource> context, Collection<ServerPlayerEntity> targets, GameMode gameMode, CallbackInfoReturnable cir) {
		if (gameMode == GameMode.CREATIVE) {
			context.getSource().sendFeedback(Text.of("<Server> Creative mode? What are you, a cheater?"), false);
		}
		return;
	}
}