Declarimg some commands to support proxy tab complete

build.gradle

@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'ru.nanit'
-version '1.2'
+version '1.2.1'
 
 repositories {
     mavenCentral()

src/main/java/ru/nanit/limbo/connection/ClientConnection.java

@@ -28,6 +28,7 @@ import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.security.InvalidKeyException;
 import java.security.MessageDigest;
+import java.util.Collections;
 import java.util.UUID;
 import java.util.concurrent.ThreadLocalRandom;
 
@@ -37,6 +38,7 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
     private static PreRenderedPacket PACKET_JOIN_GAME;
     private static PreRenderedPacket PACKET_PLAYER_ABILITIES;
     private static PreRenderedPacket PACKET_PLAYER_INFO;
+    private static PreRenderedPacket PACKET_DECLARE_COMMANDS;
     private static PreRenderedPacket PACKET_PLAYER_POS;
     private static PreRenderedPacket PACKET_JOIN_MESSAGE;
     private static PreRenderedPacket PACKET_BOSS_BAR;
@@ -191,6 +193,7 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         writePacket(PACKET_PLAYER_ABILITIES);
         writePacket(PACKET_PLAYER_POS);
         writePacket(PACKET_PLAYER_INFO);
+        writePacket(PACKET_DECLARE_COMMANDS);
 
         if (PACKET_BOSS_BAR != null)
             writePacket(PACKET_BOSS_BAR);
@@ -312,11 +315,15 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         info.setGameMode(server.getConfig().getGameMode());
         info.setUuid(uuid);
 
+        PacketDeclareCommands declareCommands = new PacketDeclareCommands();
+        declareCommands.setCommands(Collections.singletonList("limbo"));
+
         PACKET_LOGIN_SUCCESS = PreRenderedPacket.of(loginSuccess);
         PACKET_JOIN_GAME = PreRenderedPacket.of(joinGame);
         PACKET_PLAYER_ABILITIES = PreRenderedPacket.of(playerAbilities);
         PACKET_PLAYER_POS = PreRenderedPacket.of(positionAndLook);
         PACKET_PLAYER_INFO = PreRenderedPacket.of(info);
+        PACKET_DECLARE_COMMANDS = PreRenderedPacket.of(declareCommands);
 
         if (server.getConfig().isUseJoinMessage()){
             PacketChatMessage joinMessage = new PacketChatMessage();

src/main/java/ru/nanit/limbo/protocol/packets/play/PacketDeclareCommands.java

@@ -0,0 +1,52 @@
+package ru.nanit.limbo.protocol.packets.play;
+
+import ru.nanit.limbo.protocol.ByteMessage;
+import ru.nanit.limbo.protocol.PacketOut;
+
+import java.util.List;
+
+public class PacketDeclareCommands implements PacketOut {
+
+    private List<String> commands;
+
+    public void setCommands(List<String> commands) {
+        this.commands = commands;
+    }
+
+    @Override
+    public void encode(ByteMessage msg) {
+        msg.writeVarInt(commands.size() * 2 + 1); // +1 because declaring root node
+
+        // Declare root node
+
+        msg.writeByte(0);
+        msg.writeVarInt(commands.size());
+
+        for (int i = 1; i <= commands.size() * 2; i++){
+            msg.writeVarInt(i++);
+        }
+
+        // Declare other commands
+
+        int i = 1;
+        for (String cmd : commands){
+            msg.writeByte(1 | 0x04);
+            msg.writeVarInt(1);
+            msg.writeVarInt(i + 1);
+            msg.writeString(cmd);
+            i++;
+
+            msg.writeByte(2 | 0x04 | 0x10);
+            msg.writeVarInt(1);
+            msg.writeVarInt(i);
+            msg.writeString("arg");
+            msg.writeString("brigadier:string");
+            msg.writeVarInt(0);
+            msg.writeString("minecraft:ask_server");
+            i++;
+        }
+
+        msg.writeVarInt(0);
+    }
+
+}

src/main/java/ru/nanit/limbo/protocol/registry/State.java

@@ -39,6 +39,7 @@ public enum State {
     PLAY(3){
         {
             serverBound.register(0x10, PacketKeepAlive::new);
+            clientBound.register(0x10, PacketDeclareCommands::new);
             clientBound.register(0x24, PacketJoinGame::new);
             clientBound.register(0x30, PacketPlayerAbilities::new);
             clientBound.register(0x34, PacketPlayerPositionAndLook::new);