From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 20 Dec 2020 16:41:44 -0800
Subject: [PATCH] Added WorldGameRuleChangeEvent


diff --git a/src/main/java/net/minecraft/server/CommandGamerule.java b/src/main/java/net/minecraft/server/CommandGamerule.java
index 1ae60aae1d2017226c1f3ea39148d24aaf40cdde..f8ce9be8527111786c233c98e45f6d8fe183c70e 100644
--- a/src/main/java/net/minecraft/server/CommandGamerule.java
+++ b/src/main/java/net/minecraft/server/CommandGamerule.java
@@ -27,7 +27,7 @@ public class CommandGamerule {
         CommandListenerWrapper commandlistenerwrapper = (CommandListenerWrapper) commandcontext.getSource();
         T t0 = commandlistenerwrapper.getWorld().getGameRules().get(gamerules_gamerulekey); // CraftBukkit
 
-        t0.b(commandcontext, "value");
+        t0.setValue(commandcontext, "value", gamerules_gamerulekey); // Paper
         commandlistenerwrapper.sendMessage(new ChatMessage("commands.gamerule.set", new Object[]{gamerules_gamerulekey.a(), t0.toString()}), true);
         return t0.getIntValue();
     }
diff --git a/src/main/java/net/minecraft/server/GameRules.java b/src/main/java/net/minecraft/server/GameRules.java
index b245428604e2a432fa3bab4836a5ca1fb35c3f64..53b40f8947c9380ef57ecc7edca203c5bc894013 100644
--- a/src/main/java/net/minecraft/server/GameRules.java
+++ b/src/main/java/net/minecraft/server/GameRules.java
@@ -18,6 +18,7 @@ import java.util.function.Supplier;
 import javax.annotation.Nullable;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import io.papermc.paper.event.world.WorldGameRuleChangeEvent; // Paper
 
 public class GameRules {
 
@@ -170,8 +171,11 @@ public class GameRules {
         }
 
         @Override
-        protected void a(CommandContext<CommandListenerWrapper> commandcontext, String s) {
-            this.b = BoolArgumentType.getBool(commandcontext, s);
+        protected void a(CommandContext<CommandListenerWrapper> commandcontext, String s, GameRules.GameRuleKey<GameRuleBoolean> gameRuleKey) { // Paper start
+            WorldGameRuleChangeEvent event = new WorldGameRuleChangeEvent(commandcontext.getSource().getBukkitWorld(), commandcontext.getSource().getBukkitSender(), (org.bukkit.GameRule<Boolean>) org.bukkit.GameRule.getByName(gameRuleKey.toString()), String.valueOf(BoolArgumentType.getBool(commandcontext, s)));
+            if (!event.callEvent()) return;
+            this.b = Boolean.parseBoolean(event.getValue());
+            // Paper end
         }
 
         public boolean a() {
@@ -230,8 +234,11 @@ public class GameRules {
         }
 
         @Override
-        protected void a(CommandContext<CommandListenerWrapper> commandcontext, String s) {
-            this.b = IntegerArgumentType.getInteger(commandcontext, s);
+        protected void a(CommandContext<CommandListenerWrapper> commandcontext, String s, GameRules.GameRuleKey<GameRuleInt> gameRuleKey) { // Paper start
+            WorldGameRuleChangeEvent event = new WorldGameRuleChangeEvent(commandcontext.getSource().getBukkitWorld(), commandcontext.getSource().getBukkitSender(), (org.bukkit.GameRule<Integer>) org.bukkit.GameRule.getByName(gameRuleKey.toString()), String.valueOf(IntegerArgumentType.getInteger(commandcontext, s)));
+            if (!event.callEvent()) return;
+            this.b = Integer.parseInt(event.getValue());
+            // Paper end
         }
 
         public int a() {
@@ -284,10 +291,12 @@ public class GameRules {
             this.a = gamerules_gameruledefinition;
         }
 
-        protected abstract void a(CommandContext<CommandListenerWrapper> commandcontext, String s);
+        protected void updateValue(CommandContext<CommandListenerWrapper> commandcontext, String s, GameRules.GameRuleKey<T> gameRuleKey) { this.a(commandcontext, s, gameRuleKey); } // Paper - OBFHELPER
+        protected abstract void a(CommandContext<CommandListenerWrapper> commandcontext, String s, GameRules.GameRuleKey<T> gameRuleKey); // Paper
 
-        public void b(CommandContext<CommandListenerWrapper> commandcontext, String s) {
-            this.a(commandcontext, s);
+        public void setValue(CommandContext<CommandListenerWrapper> commandcontext, String s, GameRules.GameRuleKey<T> gameRuleKey) { this.b(commandcontext, s, gameRuleKey); } // Paper - OBFHELPER
+        public void b(CommandContext<CommandListenerWrapper> commandcontext, String s, GameRules.GameRuleKey<T> gameRuleKey) { // Paper
+            this.updateValue(commandcontext, s, gameRuleKey); // Paper
             this.onChange(((CommandListenerWrapper) commandcontext.getSource()).getServer());
         }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index b71316cce3bdbf3485be456f0260c6b3463cff8e..0314cb1270803265dc4bf4268697b09aabf2c612 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -2345,8 +2345,13 @@ public class CraftWorld implements World {
 
         if (!isGameRule(rule)) return false;
 
+        // Paper start
+        GameRule<?> gameRule = GameRule.getByName(rule);
+        io.papermc.paper.event.world.WorldGameRuleChangeEvent event = new io.papermc.paper.event.world.WorldGameRuleChangeEvent(this, null, gameRule, value);
+        if (!event.callEvent()) return false;
+        // Paper end
         GameRules.GameRuleValue<?> handle = getHandle().getGameRules().get(getGameRulesNMS().get(rule));
-        handle.setValue(value);
+        handle.setValue(event.getValue().toString()); // Paper
         handle.onChange(getHandle().getMinecraftServer());
         return true;
     }
@@ -2381,8 +2386,12 @@ public class CraftWorld implements World {
 
         if (!isGameRule(rule.getName())) return false;
 
+        // Paper start
+        io.papermc.paper.event.world.WorldGameRuleChangeEvent event = new io.papermc.paper.event.world.WorldGameRuleChangeEvent(this, null, rule, String.valueOf(newValue));
+        if (!event.callEvent()) return false;
+        // Paper end
         GameRules.GameRuleValue<?> handle = getHandle().getGameRules().get(getGameRulesNMS().get(rule.getName()));
-        handle.setValue(newValue.toString());
+        handle.setValue(event.getValue().toString()); // Paper
         handle.onChange(getHandle().getMinecraftServer());
         return true;
     }