From 3a135ada91f3d50eaf21c0e006fe20e605edc348 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Fri, 31 May 2024 08:46:42 -0700
Subject: [PATCH] Fire TabCompleteEvent for legacy commands (#10834)

---
 patches/api/Brigadier-based-command-API.patch    | 13 +++++++++++++
 patches/server/Brigadier-based-command-API.patch | 13 +++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/patches/api/Brigadier-based-command-API.patch b/patches/api/Brigadier-based-command-API.patch
index 4be5e07741..e6208fc939 100644
--- a/patches/api/Brigadier-based-command-API.patch
+++ b/patches/api/Brigadier-based-command-API.patch
@@ -1974,3 +1974,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          Command.broadcastCommandMessage(sender, ChatColor.GREEN + "Reload complete.");
  
          return true;
+diff --git a/src/main/java/org/bukkit/event/server/TabCompleteEvent.java b/src/main/java/org/bukkit/event/server/TabCompleteEvent.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/event/server/TabCompleteEvent.java
++++ b/src/main/java/org/bukkit/event/server/TabCompleteEvent.java
+@@ -0,0 +0,0 @@ import org.jetbrains.annotations.NotNull;
+  * themselves. Plugins wishing to remove commands from tab completion are
+  * advised to ensure the client does not have permission for the relevant
+  * commands, or use {@link PlayerCommandSendEvent}.
++ * @apiNote Only called for bukkit API commands {@link org.bukkit.command.Command} and
++ * {@link org.bukkit.command.CommandExecutor} and not for brigadier commands ({@link io.papermc.paper.command.brigadier.Commands}).
+  */
+ public class TabCompleteEvent extends Event implements Cancellable {
+ 
diff --git a/patches/server/Brigadier-based-command-API.patch b/patches/server/Brigadier-based-command-API.patch
index ef780f83b1..e9ec61aafd 100644
--- a/patches/server/Brigadier-based-command-API.patch
+++ b/patches/server/Brigadier-based-command-API.patch
@@ -1845,6 +1845,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import com.mojang.brigadier.suggestion.SuggestionsBuilder;
 +import com.mojang.brigadier.tree.LiteralCommandNode;
 +import io.papermc.paper.command.brigadier.CommandSourceStack;
++import java.util.ArrayList;
++import java.util.Collections;
 +import net.minecraft.commands.CommandSource;
 +import org.bukkit.Bukkit;
 +import org.bukkit.ChatColor;
@@ -1857,6 +1859,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import java.util.List;
 +import java.util.concurrent.CompletableFuture;
 +import java.util.logging.Level;
++import org.bukkit.entity.Entity;
++import org.bukkit.entity.Player;
++import org.bukkit.event.server.TabCompleteEvent;
 +
 +public class BukkitCommandNode extends LiteralCommandNode<CommandSourceStack> {
 +
@@ -1951,6 +1956,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +                Bukkit.getServer().getLogger().log(Level.SEVERE, "Exception when " + sender.getName() + " attempted to tab complete " + builder.getRemaining(), ex);
 +            }
 +
++            if (sender instanceof final Player player) {
++                TabCompleteEvent tabEvent = new org.bukkit.event.server.TabCompleteEvent(player, builder.getInput(), results != null ? results : new ArrayList<>(), true, pos); // Paper - AsyncTabCompleteEvent
++                if (!tabEvent.callEvent()) {
++                    results = null;
++                } else {
++                    results = tabEvent.getCompletions();
++                }
++            }
 +            // Paper end
 +            if (results == null) {
 +                return builder.buildFuture();