Code/net/minecraft/server/commands/TitleCommand.java

package net.minecraft.server.commands;

import com.mojang.brigadier.CommandDispatcher;
import com.mojang.brigadier.arguments.IntegerArgumentType;
import com.mojang.brigadier.context.CommandContext;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import java.util.Collection;
import java.util.function.Function;
import net.minecraft.commands.CommandBuildContext;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.Commands;
import net.minecraft.commands.arguments.ComponentArgument;
import net.minecraft.commands.arguments.EntityArgument;
import net.minecraft.commands.arguments.TimeArgument;
import net.minecraft.network.chat.Component;
import net.minecraft.network.chat.ComponentUtils;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.protocol.game.ClientboundClearTitlesPacket;
import net.minecraft.network.protocol.game.ClientboundSetActionBarTextPacket;
import net.minecraft.network.protocol.game.ClientboundSetSubtitleTextPacket;
import net.minecraft.network.protocol.game.ClientboundSetTitleTextPacket;
import net.minecraft.network.protocol.game.ClientboundSetTitlesAnimationPacket;
import net.minecraft.server.level.ServerPlayer;

public class TitleCommand {
    public static void register(CommandDispatcher<CommandSourceStack> p_139103_, CommandBuildContext p_327792_) {
        p_139103_.register(
            Commands.literal("title")
                .requires(p_139107_ -> p_139107_.hasPermission(2))
                .then(
                    Commands.argument("targets", EntityArgument.players())
                        .then(Commands.literal("clear").executes(p_139134_ -> clearTitle(p_139134_.getSource(), EntityArgument.getPlayers(p_139134_, "targets"))))
                        .then(Commands.literal("reset").executes(p_139132_ -> resetTitle(p_139132_.getSource(), EntityArgument.getPlayers(p_139132_, "targets"))))
                        .then(
                            Commands.literal("title")
                                .then(
                                    Commands.argument("title", ComponentArgument.textComponent(p_327792_))
                                        .executes(
                                            p_390117_ -> showTitle(
                                                p_390117_.getSource(),
                                                EntityArgument.getPlayers(p_390117_, "targets"),
                                                ComponentArgument.getRawComponent(p_390117_, "title"),
                                                "title",
                                                ClientboundSetTitleTextPacket::new
                                            )
                                        )
                                )
                        )
                        .then(
                            Commands.literal("subtitle")
                                .then(
                                    Commands.argument("title", ComponentArgument.textComponent(p_327792_))
                                        .executes(
                                            p_390121_ -> showTitle(
                                                p_390121_.getSource(),
                                                EntityArgument.getPlayers(p_390121_, "targets"),
                                                ComponentArgument.getRawComponent(p_390121_, "title"),
                                                "subtitle",
                                                ClientboundSetSubtitleTextPacket::new
                                            )
                                        )
                                )
                        )
                        .then(
                            Commands.literal("actionbar")
                                .then(
                                    Commands.argument("title", ComponentArgument.textComponent(p_327792_))
                                        .executes(
                                            p_390118_ -> showTitle(
                                                p_390118_.getSource(),
                                                EntityArgument.getPlayers(p_390118_, "targets"),
                                                ComponentArgument.getRawComponent(p_390118_, "title"),
                                                "actionbar",
                                                ClientboundSetActionBarTextPacket::new
                                            )
                                        )
                                )
                        )
                        .then(
                            Commands.literal("times")
                                .then(
                                    Commands.argument("fadeIn", TimeArgument.time())
                                        .then(
                                            Commands.argument("stay", TimeArgument.time())
                                                .then(
                                                    Commands.argument("fadeOut", TimeArgument.time())
                                                        .executes(
                                                            p_139105_ -> setTimes(
                                                                p_139105_.getSource(),
                                                                EntityArgument.getPlayers(p_139105_, "targets"),
                                                                IntegerArgumentType.getInteger(p_139105_, "fadeIn"),
                                                                IntegerArgumentType.getInteger(p_139105_, "stay"),
                                                                IntegerArgumentType.getInteger(p_139105_, "fadeOut")
                                                            )
                                                        )
                                                )
                                        )
                                )
                        )
                )
        );
    }

    private static int clearTitle(CommandSourceStack p_139109_, Collection<ServerPlayer> p_139110_) {
        ClientboundClearTitlesPacket clientboundcleartitlespacket = new ClientboundClearTitlesPacket(false);

        for (ServerPlayer serverplayer : p_139110_) {
            serverplayer.connection.send(clientboundcleartitlespacket);
        }

        if (p_139110_.size() == 1) {
            p_139109_.sendSuccess(() -> Component.translatable("commands.title.cleared.single", p_139110_.iterator().next().getDisplayName()), true);
        } else {
            p_139109_.sendSuccess(() -> Component.translatable("commands.title.cleared.multiple", p_139110_.size()), true);
        }

        return p_139110_.size();
    }

    private static int resetTitle(CommandSourceStack p_139125_, Collection<ServerPlayer> p_139126_) {
        ClientboundClearTitlesPacket clientboundcleartitlespacket = new ClientboundClearTitlesPacket(true);

        for (ServerPlayer serverplayer : p_139126_) {
            serverplayer.connection.send(clientboundcleartitlespacket);
        }

        if (p_139126_.size() == 1) {
            p_139125_.sendSuccess(() -> Component.translatable("commands.title.reset.single", p_139126_.iterator().next().getDisplayName()), true);
        } else {
            p_139125_.sendSuccess(() -> Component.translatable("commands.title.reset.multiple", p_139126_.size()), true);
        }

        return p_139126_.size();
    }

    private static int showTitle(
        CommandSourceStack p_142781_, Collection<ServerPlayer> p_142782_, Component p_142783_, String p_142784_, Function<Component, Packet<?>> p_142785_
    ) throws CommandSyntaxException {
        for (ServerPlayer serverplayer : p_142782_) {
            serverplayer.connection.send(p_142785_.apply(ComponentUtils.updateForEntity(p_142781_, p_142783_, serverplayer, 0)));
        }

        if (p_142782_.size() == 1) {
            p_142781_.sendSuccess(() -> Component.translatable("commands.title.show." + p_142784_ + ".single", p_142782_.iterator().next().getDisplayName()), true);
        } else {
            p_142781_.sendSuccess(() -> Component.translatable("commands.title.show." + p_142784_ + ".multiple", p_142782_.size()), true);
        }

        return p_142782_.size();
    }

    private static int setTimes(CommandSourceStack p_139112_, Collection<ServerPlayer> p_139113_, int p_139114_, int p_139115_, int p_139116_) {
        ClientboundSetTitlesAnimationPacket clientboundsettitlesanimationpacket = new ClientboundSetTitlesAnimationPacket(p_139114_, p_139115_, p_139116_);

        for (ServerPlayer serverplayer : p_139113_) {
            serverplayer.connection.send(clientboundsettitlesanimationpacket);
        }

        if (p_139113_.size() == 1) {
            p_139112_.sendSuccess(() -> Component.translatable("commands.title.times.single", p_139113_.iterator().next().getDisplayName()), true);
        } else {
            p_139112_.sendSuccess(() -> Component.translatable("commands.title.times.multiple", p_139113_.size()), true);
        }

        return p_139113_.size();
    }
}