From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Fri, 13 Mar 2020 22:29:10 -0500
Subject: [PATCH] Add ping command


diff --git a/src/main/java/net/minecraft/commands/Commands.java b/src/main/java/net/minecraft/commands/Commands.java
index a5829f0726fd92faae04f978c82b2f0736bcd50b..32fbe67a2dceda1a165edc7397a64beffc537488 100644
--- a/src/main/java/net/minecraft/commands/Commands.java
+++ b/src/main/java/net/minecraft/commands/Commands.java
@@ -230,6 +230,7 @@ public class Commands {
             SetPlayerIdleTimeoutCommand.register(this.dispatcher);
             StopCommand.register(this.dispatcher);
             WhitelistCommand.register(this.dispatcher);
+            org.purpurmc.purpur.command.PingCommand.register(this.dispatcher); // Purpur
         }
 
         if (environment.includeIntegrated) {
diff --git a/src/main/java/org/purpurmc/purpur/PurpurConfig.java b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
index e2edbb0842862b8ffdf30cec104a1d71a71e92e0..35400f352d44be9a32eb69eb87a3ffdeef9a20b3 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
@@ -179,6 +179,7 @@ public class PurpurConfig {
     public static boolean afkBroadcastUseDisplayName = false;
     public static String afkTabListPrefix = "[AFK] ";
     public static String afkTabListSuffix = "";
+    public static String pingCommandOutput = "<green>%s's ping is %sms";
     private static void messages() {
         cannotRideMob = getString("settings.messages.cannot-ride-mob", cannotRideMob);
         afkBroadcastAway = getString("settings.messages.afk-broadcast-away", afkBroadcastAway);
@@ -186,6 +187,7 @@ public class PurpurConfig {
         afkBroadcastUseDisplayName = getBoolean("settings.messages.afk-broadcast-use-display-name", afkBroadcastUseDisplayName);
         afkTabListPrefix = MiniMessage.miniMessage().serialize(MiniMessage.miniMessage().deserialize(getString("settings.messages.afk-tab-list-prefix", afkTabListPrefix)));
         afkTabListSuffix = MiniMessage.miniMessage().serialize(MiniMessage.miniMessage().deserialize(getString("settings.messages.afk-tab-list-suffix", afkTabListSuffix)));
+        pingCommandOutput = getString("settings.messages.ping-command-output", pingCommandOutput);
     }
 
     public static String serverModName = "Purpur";
diff --git a/src/main/java/org/purpurmc/purpur/command/PingCommand.java b/src/main/java/org/purpurmc/purpur/command/PingCommand.java
new file mode 100644
index 0000000000000000000000000000000000000000..f202b98a194604e39798fdb8e417c6d2835f71c8
--- /dev/null
+++ b/src/main/java/org/purpurmc/purpur/command/PingCommand.java
@@ -0,0 +1,33 @@
+package org.purpurmc.purpur.command;
+
+import com.mojang.brigadier.CommandDispatcher;
+import net.minecraft.commands.CommandSourceStack;
+import net.minecraft.commands.Commands;
+import net.minecraft.commands.arguments.EntityArgument;
+import net.minecraft.server.level.ServerPlayer;
+import org.purpurmc.purpur.PurpurConfig;
+import org.bukkit.craftbukkit.util.CraftChatMessage;
+
+import java.util.Collection;
+import java.util.Collections;
+
+public class PingCommand {
+    public static void register(CommandDispatcher<CommandSourceStack> dispatcher) {
+        dispatcher.register(Commands.literal("ping")
+                .requires((listener) -> listener.hasPermission(2, "bukkit.command.ping"))
+                .executes((context) -> execute(context.getSource(), Collections.singleton(context.getSource().getPlayerOrException())))
+                .then(Commands.argument("targets", EntityArgument.players())
+                        .requires(listener -> listener.hasPermission(2, "bukkit.command.ping.other"))
+                        .executes((context) -> execute(context.getSource(), EntityArgument.getPlayers(context, "targets")))
+                )
+        );
+    }
+
+    private static int execute(CommandSourceStack sender, Collection<ServerPlayer> targets) {
+        for (ServerPlayer player : targets) {
+            String output = String.format(PurpurConfig.pingCommandOutput, player.getGameProfile().getName(), player.connection.latency());
+            sender.sendSuccess(output, false);
+        }
+        return targets.size();
+    }
+}