ExampleCommands.java

package com.example.examplemod;

import com.mojang.brigadier.arguments.IntegerArgumentType;
import net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback;
import net.minecraft.command.argument.EntityArgumentType;
import net.minecraft.entity.Entity;
import net.minecraft.server.command.CommandManager;
import net.minecraft.server.command.ServerCommandSource;
import net.minecraft.text.Text;

/**
 * Brigadier command registration via Fabric's CommandRegistrationCallback.
 * Unchanged across 1.21.7 - 1.21.11.
 */
public final class ExampleCommands {

    private ExampleCommands() {}

    public static void register() {
        CommandRegistrationCallback.EVENT.register((dispatcher, registryAccess, environment) -> {

            dispatcher.register(CommandManager.literal("examplemod")
                    .then(CommandManager.literal("hello")
                            .executes(ExampleCommands::executeHello))
                    .then(CommandManager.literal("give")
                            .then(CommandManager.argument("amount", IntegerArgumentType.integer(1, 64))
                                    .executes(ExampleCommands::executeGive)))
                    .then(CommandManager.literal("ping")
                            .then(CommandManager.argument("target", EntityArgumentType.player())
                                    .executes(ExampleCommands::executePing)))
            );
        });
    }

    private static int executeHello(com.mojang.brigadier.context.CommandContext<ServerCommandSource> ctx) {
        ctx.getSource().sendFeedback(() -> Text.literal("Hello from ExampleMod!"), false);
        return 1;
    }

    private static int executeGive(com.mojang.brigadier.context.CommandContext<ServerCommandSource> ctx) {
        int amount = IntegerArgumentType.getInteger(ctx, "amount");
        var player = ctx.getSource().getPlayerOrThrow();
        player.giveItemStack(new net.minecraft.item.ItemStack(ExampleMod.EXAMPLE_GEM, amount));
        ctx.getSource().sendFeedback(() -> Text.literal("Gave " + amount + " example gems."), true);
        return 1;
    }

    private static int executePing(com.mojang.brigadier.context.CommandContext<ServerCommandSource> ctx)
            throws com.mojang.brigadier.exceptions.CommandSyntaxException {
        Entity target = EntityArgumentType.getPlayer(ctx, "target");
        ctx.getSource().sendFeedback(() -> Text.literal("Pinged " + target.getName().getString()), false);
        return 1;
    }
}