From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <Blake.Galbreath@GMail.com>
Date: Mon, 30 Nov 2020 03:12:04 -0600
Subject: [PATCH] Add demo command


diff --git a/src/main/java/net/minecraft/commands/Commands.java b/src/main/java/net/minecraft/commands/Commands.java
index 0aeee502c60a81e6a9ca765e57ab27f5c588ac1d..2bfcd4222daa7c5b5cc8cfa0545241afd3cb8d15 100644
--- a/src/main/java/net/minecraft/commands/Commands.java
+++ b/src/main/java/net/minecraft/commands/Commands.java
@@ -250,6 +250,7 @@ public class Commands {
             SetPlayerIdleTimeoutCommand.register(this.dispatcher);
             StopCommand.register(this.dispatcher);
             WhitelistCommand.register(this.dispatcher);
+            org.purpurmc.purpur.command.DemoCommand.register(this.dispatcher); // Purpur
             org.purpurmc.purpur.command.PingCommand.register(this.dispatcher); // Purpur
         }
 
diff --git a/src/main/java/org/purpurmc/purpur/PurpurConfig.java b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
index 35400f352d44be9a32eb69eb87a3ffdeef9a20b3..00fb3507118960046a61d8a21f9654f279d53874 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 demoCommandOutput = "<green>%s has been shown the demo screen";
     public static String pingCommandOutput = "<green>%s's ping is %sms";
     private static void messages() {
         cannotRideMob = getString("settings.messages.cannot-ride-mob", cannotRideMob);
@@ -187,6 +188,7 @@ 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)));
+        demoCommandOutput = getString("settings.messages.demo-command-output", demoCommandOutput);
         pingCommandOutput = getString("settings.messages.ping-command-output", pingCommandOutput);
     }
 
diff --git a/src/main/java/org/purpurmc/purpur/command/DemoCommand.java b/src/main/java/org/purpurmc/purpur/command/DemoCommand.java
new file mode 100644
index 0000000000000000000000000000000000000000..235f3cd89f675b70a6152a00534608c0902f19fd
--- /dev/null
+++ b/src/main/java/org/purpurmc/purpur/command/DemoCommand.java
@@ -0,0 +1,35 @@
+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.network.protocol.game.ClientboundGameEventPacket;
+import net.minecraft.server.level.ServerPlayer;
+import org.purpurmc.purpur.PurpurConfig;
+
+import java.util.Collection;
+import java.util.Collections;
+
+public class DemoCommand {
+    public static void register(CommandDispatcher<CommandSourceStack> dispatcher) {
+        dispatcher.register(Commands.literal("demo")
+                .requires((listener) -> listener.hasPermission(2, "bukkit.command.demo"))
+                .executes((context) -> execute(context.getSource(), Collections.singleton(context.getSource().getPlayerOrException())))
+                .then(Commands.argument("targets", EntityArgument.players())
+                        .requires(listener -> listener.hasPermission(2, "bukkit.command.demo.other"))
+                        .executes((context) -> execute(context.getSource(), EntityArgument.getPlayers(context, "targets")))
+                )
+        );
+    }
+
+    private static int execute(CommandSourceStack sender, Collection<ServerPlayer> targets) {
+        for (ServerPlayer player : targets) {
+            ClientboundGameEventPacket packet = new ClientboundGameEventPacket(ClientboundGameEventPacket.DEMO_EVENT, 0);
+            player.connection.send(packet);
+            String output = String.format(PurpurConfig.demoCommandOutput, player.getGameProfile().getName());
+            sender.sendSuccess(output, false);
+        }
+        return targets.size();
+    }
+}