From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sun, 23 Aug 2020 20:59:00 +0200
Subject: [PATCH] Climbing should not bypass cramming gamerule


diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 79229cb327e931443d23255720cb4d0716831c69..eb8d3d911f3fc5b6fc6ac892a95ae12e58d0540d 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -74,6 +74,11 @@ public class PaperWorldConfig {
         wanderingTraderSpawnChanceMax = getInt("wandering-trader.spawn-chance-max", wanderingTraderSpawnChanceMax);
     }
 
+    public boolean fixClimbingBypassingCrammingRule = false;
+    private void fixClimbingBypassingCrammingRule() {
+        fixClimbingBypassingCrammingRule = getBoolean("fix-climbing-bypassing-cramming-rule", fixClimbingBypassingCrammingRule);
+    }
+
     public short keepLoadedRange;
     private void keepLoadedRange() {
         keepLoadedRange = (short) (getInt("keep-spawn-loaded-range", Math.min(spigotConfig.viewDistance, 10)) * 16);
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index ae2937e6b6b0ac150f6f608459d2b75a05e16c36..3e52bdd450c5af9a455b627dc8997cbcc7dd1f59 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -1726,6 +1726,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
     }
 
     public boolean isPushable() {
+        // Paper start
+        return isCollidable(false);
+    }
+
+    public boolean isCollidable(boolean ignoreClimbing) {
+        // Paper end
         return false;
     }
 
diff --git a/src/main/java/net/minecraft/world/entity/EntitySelector.java b/src/main/java/net/minecraft/world/entity/EntitySelector.java
index 8fb89326395a7e70982c0d757b506565e98b12a4..a060cca08631fb42041e3a79a9abc422fe7757af 100644
--- a/src/main/java/net/minecraft/world/entity/EntitySelector.java
+++ b/src/main/java/net/minecraft/world/entity/EntitySelector.java
@@ -44,11 +44,17 @@ public final class EntitySelector {
     }
 
     public static Predicate<Entity> pushableBy(Entity entity) {
+        // Paper start - ignoreClimbing param
+        return pushable(entity, false);
+    }
+
+    public static Predicate<Entity> pushable(Entity entity, boolean ignoreClimbing) {
+        // Paper end
         Team scoreboardteambase = entity.getTeam();
         Team.CollisionRule scoreboardteambase_enumteampush = scoreboardteambase == null ? Team.CollisionRule.ALWAYS : scoreboardteambase.getCollisionRule();
 
         return (Predicate) (scoreboardteambase_enumteampush == Team.CollisionRule.NEVER ? Predicates.alwaysFalse() : EntitySelector.NO_SPECTATORS.and((entity1) -> {
-            if (!entity1.canCollideWithBukkit(entity) || !entity.canCollideWithBukkit(entity1)) { // CraftBukkit - collidable API
+            if (!entity1.isCollidable(ignoreClimbing) || !entity1.canCollideWithBukkit(entity) || !entity.canCollideWithBukkit(entity1)) { // CraftBukkit - collidable API // Paper - isCollidable
                 return false;
             } else if (entity.level.isClientSide && (!(entity1 instanceof Player) || !((Player) entity1).isLocalPlayer())) {
                 return false;
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 0c7ed53964675c81185644549898369cdda80377..3227ce58391b93c12dd01e2b73a3a6c5d6062827 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3277,7 +3277,7 @@ public abstract class LivingEntity extends Entity {
             return;
         }
         // Paper end - don't run getEntities if we're not going to use its result
-        List<Entity> list = this.level.getEntities(this, this.getBoundingBox(), EntitySelector.pushableBy(this));
+        List<Entity> list = this.level.getEntities(this, this.getBoundingBox(), EntitySelector.pushable(this, level.paperConfig.fixClimbingBypassingCrammingRule)); // Paper - fix climbing bypassing cramming rule
 
         if (!list.isEmpty()) {
             // Paper - move up
@@ -3444,9 +3444,16 @@ public abstract class LivingEntity extends Entity {
         return !this.isRemoved() && this.collides; // CraftBukkit
     }
 
+    // Paper start
     @Override
     public boolean isPushable() {
-        return this.isAlive() && !this.isSpectator() && !this.onClimbable() && this.collides; // CraftBukkit
+        return this.isCollidable(level.paperConfig.fixClimbingBypassingCrammingRule);
+    }
+
+    @Override
+    public boolean isCollidable(boolean ignoreClimbing) {
+        return this.isAlive() && !this.isSpectator() && (ignoreClimbing || !this.onClimbable()) && this.collides; // CraftBukkit
+        // Paper end
     }
 
     // CraftBukkit start - collidable API
diff --git a/src/main/java/net/minecraft/world/entity/ambient/Bat.java b/src/main/java/net/minecraft/world/entity/ambient/Bat.java
index 9cd91a73ae1a6ad550b9482db1fb7d72d7247c6e..153194d937d210e2e4fd8864e4a3c000f85d7e2e 100644
--- a/src/main/java/net/minecraft/world/entity/ambient/Bat.java
+++ b/src/main/java/net/minecraft/world/entity/ambient/Bat.java
@@ -83,7 +83,7 @@ public class Bat extends AmbientCreature {
     }
 
     @Override
-    public boolean isPushable() {
+    public boolean isCollidable(boolean ignoreClimbing) { // Paper
         return false;
     }
 
diff --git a/src/main/java/net/minecraft/world/entity/animal/Parrot.java b/src/main/java/net/minecraft/world/entity/animal/Parrot.java
index 23f87848b42d180c94b5659b184a768a756deed8..345fe87d5d6c3883c28d2c1b34d1020e18864d97 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Parrot.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Parrot.java
@@ -380,8 +380,8 @@ public class Parrot extends ShoulderRidingEntity implements FlyingAnimal {
     }
 
     @Override
-    public boolean isPushable() {
-        return super.isPushable(); // CraftBukkit - collidable API
+    public boolean isCollidable(boolean ignoreClimbing) { // Paper
+        return super.isCollidable(ignoreClimbing); // CraftBukkit - collidable API // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java b/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java
index e9cfe18bc6be3bc6f2d18c25b6b69e67d62ee946..5c104bf219e5e4acb8acfb160bd92f0a0621d864 100644
--- a/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java
+++ b/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java
@@ -239,7 +239,7 @@ public abstract class AbstractHorse extends Animal implements ContainerListener,
     }
 
     @Override
-    public boolean isPushable() {
+    public boolean isCollidable(boolean ignoreClimbing) { // Paper
         return !this.isVehicle();
     }
 
diff --git a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
index 069cdfce085909991a69ebec3004d407526d469d..5fc66d7096afcfe63eba774e1dc330ac3263e4b0 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
@@ -345,7 +345,7 @@ public class ArmorStand extends LivingEntity {
     }
 
     @Override
-    public boolean isPushable() {
+    public boolean isCollidable(boolean ignoreClimbing) { // Paper
         return false;
     }
 
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
index fa889f93a5c6782957bdbf803915cb5e80e05f3e..9653b142c199c068e4d6175bcd3cbecb6465853f 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
@@ -149,7 +149,7 @@ public abstract class AbstractMinecart extends Entity {
     }
 
     @Override
-    public boolean isPushable() {
+    public boolean isCollidable(boolean ignoreClimbing) { // Paper
         return true;
     }
 
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/Boat.java b/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
index 3f1059569da23bd02c00279050bf7bce7a160462..a1b93f2878e22fa1d0cad639416d2dc5b8339c73 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/Boat.java
@@ -158,7 +158,7 @@ public class Boat extends Entity {
     }
 
     @Override
-    public boolean isPushable() {
+    public boolean isCollidable(boolean ignoreClimbing) { // Paper
         return true;
     }
 
