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/commands/GameRuleCommand.java b/src/main/java/net/minecraft/server/commands/GameRuleCommand.java
index f2e53fbb067a3909f386386eb3b89dfe090ee096..6f6292e7945cec1bdc69632dbfb950d6af53df42 100644
--- a/src/main/java/net/minecraft/server/commands/GameRuleCommand.java
+++ b/src/main/java/net/minecraft/server/commands/GameRuleCommand.java
@@ -33,7 +33,7 @@ public class GameRuleCommand {
         CommandSourceStack commandlistenerwrapper = (CommandSourceStack) context.getSource();
         T t0 = commandlistenerwrapper.getLevel().getGameRules().getRule(key); // CraftBukkit
 
-        t0.setFromArgument(context, "value");
+        t0.setFromArgument(context, "value", key); // Paper
         commandlistenerwrapper.sendSuccess(new TranslatableComponent("commands.gamerule.set", new Object[]{key.getId(), t0.toString()}), true);
         return t0.getCommandResult();
     }
diff --git a/src/main/java/net/minecraft/world/level/GameRules.java b/src/main/java/net/minecraft/world/level/GameRules.java
index 74e10d581f8c1b0b026d8f940194971efbdef434..798afc145c54306fcf0838d8daef2bdf17763da9 100644
--- a/src/main/java/net/minecraft/world/level/GameRules.java
+++ b/src/main/java/net/minecraft/world/level/GameRules.java
@@ -261,10 +261,10 @@ public class GameRules {
             this.type = type;
         }
 
-        protected abstract void updateFromArgument(CommandContext<CommandSourceStack> context, String name);
+        protected abstract void updateFromArgument(CommandContext<CommandSourceStack> context, String name, GameRules.Key<T> gameRuleKey); // Paper
 
-        public void setFromArgument(CommandContext<CommandSourceStack> context, String name) {
-            this.updateFromArgument(context, name);
+        public void setFromArgument(CommandContext<CommandSourceStack> context, String name, GameRules.Key<T> gameRuleKey) { // Paper
+            this.updateFromArgument(context, name, gameRuleKey); // Paper
             this.onChanged(((CommandSourceStack) context.getSource()).getServer());
         }
 
@@ -322,8 +322,11 @@ public class GameRules {
         }
 
         @Override
-        protected void updateFromArgument(CommandContext<CommandSourceStack> context, String name) {
-            this.value = BoolArgumentType.getBool(context, name);
+        protected void updateFromArgument(CommandContext<CommandSourceStack> context, String name, GameRules.Key<BooleanValue> gameRuleKey) { // Paper start
+            io.papermc.paper.event.world.WorldGameRuleChangeEvent event = new io.papermc.paper.event.world.WorldGameRuleChangeEvent(context.getSource().getBukkitWorld(), context.getSource().getBukkitSender(), (org.bukkit.GameRule<Boolean>) org.bukkit.GameRule.getByName(gameRuleKey.toString()), String.valueOf(BoolArgumentType.getBool(context, name)));
+            if (!event.callEvent()) return;
+            this.value = Boolean.parseBoolean(event.getValue());
+            // Paper end
         }
 
         public boolean get() {
@@ -387,8 +390,11 @@ public class GameRules {
         }
 
         @Override
-        protected void updateFromArgument(CommandContext<CommandSourceStack> context, String name) {
-            this.value = IntegerArgumentType.getInteger(context, name);
+        protected void updateFromArgument(CommandContext<CommandSourceStack> context, String name, GameRules.Key<IntegerValue> gameRuleKey) { // Paper start
+            io.papermc.paper.event.world.WorldGameRuleChangeEvent event = new io.papermc.paper.event.world.WorldGameRuleChangeEvent(context.getSource().getBukkitWorld(), context.getSource().getBukkitSender(), (org.bukkit.GameRule<Integer>) org.bukkit.GameRule.getByName(gameRuleKey.toString()), String.valueOf(IntegerArgumentType.getInteger(context, name)));
+            if (!event.callEvent()) return;
+            this.value = Integer.parseInt(event.getValue());
+            // Paper end
         }
 
         public int get() {
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 2c93624bda6919ce0a291d8855cb6e176b010e0c..5cc1de91e2ccc0d3f0d6ab9adcf39f2f72bdeb9d 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1797,8 +1797,13 @@ public class CraftWorld extends CraftRegionAccessor implements World {
 
         if (!this.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.Value<?> handle = this.getHandle().getGameRules().getRule(CraftWorld.getGameRulesNMS().get(rule));
-        handle.deserialize(value);
+        handle.deserialize(event.getValue()); // Paper
         handle.onChanged(this.getHandle().getServer());
         return true;
     }
@@ -1833,8 +1838,12 @@ public class CraftWorld extends CraftRegionAccessor implements World {
 
         if (!this.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.Value<?> handle = this.getHandle().getGameRules().getRule(CraftWorld.getGameRulesNMS().get(rule.getName()));
-        handle.deserialize(newValue.toString());
+        handle.deserialize(event.getValue()); // Paper
         handle.onChanged(this.getHandle().getServer());
         return true;
     }