From f7eff332be0609f9709deb2b058ea77ff4cdd998 Mon Sep 17 00:00:00 2001
From: Riley Park <rileysebastianpark@gmail.com>
Date: Fri, 9 Jun 2017 07:24:24 -0700
Subject: [PATCH] Add configuration option to prevent player names from being
 suggested

---
 paper-api/src/main/java/org/bukkit/Bukkit.java         | 10 ++++++++++
 paper-api/src/main/java/org/bukkit/Server.java         | 10 ++++++++++
 .../src/main/java/org/bukkit/command/Command.java      |  2 +-
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/paper-api/src/main/java/org/bukkit/Bukkit.java b/paper-api/src/main/java/org/bukkit/Bukkit.java
index 5660aa59d..29e13fd7c 100644
--- a/paper-api/src/main/java/org/bukkit/Bukkit.java
+++ b/paper-api/src/main/java/org/bukkit/Bukkit.java
@@ -2412,6 +2412,16 @@ public final class Bukkit {
     public static boolean reloadCommandAliases() {
         return server.reloadCommandAliases();
     }
+
+    /**
+     * Checks if player names should be suggested when a command returns {@code null} as
+     * their tab completion result.
+     *
+     * @return true if player names should be suggested
+     */
+    public static boolean suggestPlayerNamesWhenNullTabCompletions() {
+        return server.suggestPlayerNamesWhenNullTabCompletions();
+    }
     // Paper end
 
     @NotNull
diff --git a/paper-api/src/main/java/org/bukkit/Server.java b/paper-api/src/main/java/org/bukkit/Server.java
index 2c0e3ce1e..4225105fe 100644
--- a/paper-api/src/main/java/org/bukkit/Server.java
+++ b/paper-api/src/main/java/org/bukkit/Server.java
@@ -2100,4 +2100,14 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
     void reloadPermissions(); // Paper
 
     boolean reloadCommandAliases(); // Paper
+
+    // Paper start - allow preventing player name suggestions by default
+    /**
+     * Checks if player names should be suggested when a command returns {@code null} as
+     * their tab completion result.
+     *
+     * @return true if player names should be suggested
+     */
+    boolean suggestPlayerNamesWhenNullTabCompletions();
+    // Paper end
 }
diff --git a/paper-api/src/main/java/org/bukkit/command/Command.java b/paper-api/src/main/java/org/bukkit/command/Command.java
index cee16db36..0ee08b6cd 100644
--- a/paper-api/src/main/java/org/bukkit/command/Command.java
+++ b/paper-api/src/main/java/org/bukkit/command/Command.java
@@ -107,7 +107,7 @@ public abstract class Command {
         Preconditions.checkArgument(args != null, "Arguments cannot be null");
         Preconditions.checkArgument(alias != null, "Alias cannot be null");
 
-        if (args.length == 0) {
+        if (args.length == 0 || !sender.getServer().suggestPlayerNamesWhenNullTabCompletions()) { // Paper - allow preventing player name suggestions by default) {
             return ImmutableList.of();
         }