added creply / cr

src/main/java/net/earthcomputer/clientcommands/ClientCommands.java

@@ -158,6 +158,7 @@ public static void registerCommands(CommandDispatcher<FabricClientCommandSource>
         PosCommand.register(dispatcher);
         RelogCommand.register(dispatcher);
         RenderCommand.register(dispatcher);
+        ReplyCommand.register(dispatcher);
         ShrugCommand.register(dispatcher);
         SignSearchCommand.register(dispatcher);
         SnakeCommand.register(dispatcher);

src/main/java/net/earthcomputer/clientcommands/Configs.java

@@ -176,4 +176,10 @@ public enum PacketDumpMethod {
 
     @Config
     public static int maximumPacketFieldDepth = 10;
+
+    @Config(temporary = true, setter = @Config.Setter("setMinimumReplyDelaySeconds"))
+    public static float minimumReplyDelaySeconds = 0.5f;
+    public static void setMinimumReplyDelaySeconds(float minimumReplyDelaySeconds) {
+        Configs.minimumReplyDelaySeconds = Math.clamp(minimumReplyDelaySeconds, 0.0f, 10.0f);
+    }
 }

src/main/java/net/earthcomputer/clientcommands/command/ReplyCommand.java

@@ -0,0 +1,82 @@
+package net.earthcomputer.clientcommands.command;
+
+import com.mojang.brigadier.Command;
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import com.mojang.brigadier.exceptions.Dynamic2CommandExceptionType;
+import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
+import net.earthcomputer.clientcommands.Configs;
+import net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource;
+import net.minecraft.SharedConstants;
+import net.minecraft.network.chat.Component;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static dev.xpple.clientarguments.arguments.CMessageArgument.getMessage;
+import static dev.xpple.clientarguments.arguments.CMessageArgument.message;
+import static net.fabricmc.fabric.api.client.command.v2.ClientCommandManager.argument;
+import static net.fabricmc.fabric.api.client.command.v2.ClientCommandManager.literal;
+
+public class ReplyCommand {
+    public static final float MAXIMUM_REPLY_DELAY_SECONDS = 10.0f;
+
+    private static final SimpleCommandExceptionType NO_TARGET_FOUND_EXCEPTION = new SimpleCommandExceptionType(Component.translatable("commands.creply.noTargetFound"));
+    private static final Dynamic2CommandExceptionType MESSAGE_TOO_LONG_EXCEPTION = new Dynamic2CommandExceptionType((a, b) -> Component.translatable("commands.creply.messageTooLong", a, b));
+
+    private static final List<ReplyCandidate> replyCandidates = new ArrayList<>();
+
+    @Nullable
+    public static String getCurrentTarget() {
+        long now = System.currentTimeMillis();
+
+        for (int i = 0; i < replyCandidates.size(); i++) {
+            ReplyCandidate candidate = replyCandidates.get(i);
+            if ((now - candidate.timestampMs) / 1_000.0f > MAXIMUM_REPLY_DELAY_SECONDS) {
+                replyCandidates.remove(i--);
+            }
+        }
+
+        for (int i = replyCandidates.size() - 1; i >= 0; i--) {
+            ReplyCandidate candidate = replyCandidates.get(i);
+            if ((now - candidate.timestampMs) / 1_000.0f >= Configs.minimumReplyDelaySeconds) {
+                return candidate.username;
+            }
+        }
+
+        return null;
+    }
+
+    public static void addReplyCandidate(String username, long timestamp) {
+        replyCandidates.add(new ReplyCandidate(username, timestamp));
+    }
+
+    public static void register(CommandDispatcher<FabricClientCommandSource> dispatcher) {
+        var command = dispatcher.register(literal("creply")
+            .then(argument("message", message())
+                .executes(ctx -> reply(ctx.getSource(), getMessage(ctx, "message")))));
+        dispatcher.register(literal("cr").redirect(command));
+    }
+
+    public static int reply(FabricClientCommandSource source, Component message) throws CommandSyntaxException {
+        @Nullable String target = ReplyCommand.getCurrentTarget();
+        if (target == null) {
+            throw NO_TARGET_FOUND_EXCEPTION.create();
+        }
+
+        String text = message.getString();
+        String command = String.format("w %s %s", target, text);
+
+        if (command.length() > SharedConstants.MAX_CHAT_LENGTH) {
+            throw MESSAGE_TOO_LONG_EXCEPTION.create(SharedConstants.MAX_CHAT_LENGTH - (command.length() - text.length()), text.length());
+        }
+
+        source.getClient().getConnection().sendCommand(command);
+
+        return Command.SINGLE_SUCCESS;
+    }
+
+    private record ReplyCandidate(String username, long timestampMs) {
+    }
+}

src/main/java/net/earthcomputer/clientcommands/mixin/commands/reply/ClientPacketListenerMixin.java

@@ -0,0 +1,30 @@
+package net.earthcomputer.clientcommands.mixin.commands.reply;
+
+import net.earthcomputer.clientcommands.command.ReplyCommand;
+import net.minecraft.client.multiplayer.ClientPacketListener;
+import net.minecraft.client.multiplayer.PlayerInfo;
+import net.minecraft.network.chat.ChatType;
+import net.minecraft.network.protocol.game.ClientboundPlayerChatPacket;
+import org.jetbrains.annotations.Nullable;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.UUID;
+
+@Mixin(ClientPacketListener.class)
+public abstract class ClientPacketListenerMixin {
+    @Shadow public abstract @Nullable PlayerInfo getPlayerInfo(UUID uniqueId);
+
+    @Inject(method = "handlePlayerChat", at = @At(value = "INVOKE", target = "Lnet/minecraft/network/protocol/PacketUtils;ensureRunningOnSameThread(Lnet/minecraft/network/protocol/Packet;Lnet/minecraft/network/PacketListener;Lnet/minecraft/util/thread/BlockableEventLoop;)V", shift = At.Shift.AFTER))
+    private void onHandlePlayerChat(ClientboundPlayerChatPacket packet, CallbackInfo ci) {
+        if (packet.chatType().chatType().is(ChatType.MSG_COMMAND_INCOMING) || packet.chatType().chatType().is(ChatType.MSG_COMMAND_OUTGOING)) {
+            PlayerInfo info = getPlayerInfo(packet.sender());
+            if (info != null) {
+                ReplyCommand.addReplyCandidate(info.getProfile().getName(), System.currentTimeMillis());
+            }
+        }
+    }
+}

src/main/resources/assets/clientcommands/lang/en_us.json

@@ -182,6 +182,9 @@
 
   "commands.crender.entities.success": "Entity rendering rules have been updated",
 
+  "commands.creply.noTargetFound": "Could not find a target to reply to",
+  "commands.creply.messageTooLong": "Your reply was too long (maximum: %d, given: %d)",
+
   "commands.csignsearch.starting": "Searching signs",
 
   "commands.csnap.airborne": "You cannot snap while airborne",

src/main/resources/mixins.clientcommands.json

@@ -66,6 +66,7 @@
     "commands.alias.ClientSuggestionProviderMixin",
     "commands.enchant.MultiPlayerGameModeMixin",
     "commands.findblock.ClientLevelMixin",
+    "commands.reply.ClientPacketListenerMixin",
     "commands.generic.CommandSuggestionsMixin",
     "commands.glow.LivingEntityRenderStateMixin",
     "commands.snap.MinecraftMixin",