From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Encode42 <me@encode42.dev>
Date: Sun, 8 Aug 2021 22:50:23 -0400
Subject: [PATCH] Config to allow mobs to pathfind over rails


diff --git a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
index d7bdf3c2a5b99ff7adb3e960ff356a1fad169de0..3ca846cc78ec2ac8c9f840a9ac7f0b87b871f8d7 100644
--- a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
+++ b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
@@ -240,7 +240,7 @@ public class WalkNodeEvaluator extends NodeEvaluator {
             }
 
             if (blockPathTypes != BlockPathTypes.WALKABLE && (!this.isAmphibious() || blockPathTypes != BlockPathTypes.WATER)) {
-                if ((node == null || node.costMalus < 0.0F) && maxYStep > 0 && blockPathTypes != BlockPathTypes.FENCE && blockPathTypes != BlockPathTypes.UNPASSABLE_RAIL && blockPathTypes != BlockPathTypes.TRAPDOOR && blockPathTypes != BlockPathTypes.POWDER_SNOW) {
+                if ((node == null || node.costMalus < 0.0F) && maxYStep > 0 && blockPathTypes != BlockPathTypes.FENCE && !(!this.mob.level.purpurConfig.mobsIgnoreRails && blockPathTypes == BlockPathTypes.UNPASSABLE_RAIL) && blockPathTypes != BlockPathTypes.TRAPDOOR && blockPathTypes != BlockPathTypes.POWDER_SNOW) { // Purpur
                     node = this.findAcceptedNode(x, y + 1, z, maxYStep - 1, prevFeetY, direction, nodeType);
                     if (node != null && (node.type == BlockPathTypes.OPEN || node.type == BlockPathTypes.WALKABLE) && this.mob.getBbWidth() < 1.0F) {
                         double g = (double)(x - direction.getStepX()) + 0.5D;
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index b8cf6e9037184d5945887748fb9fbfc8bcbc0f2a..a6909960d14de6c0ecea4f47902d73def5441ffa 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -132,6 +132,7 @@ public class PurpurWorldConfig {
     public double voidDamageDealt = 4.0D;
     public int raidCooldownSeconds = 0;
     public int animalBreedingCooldownSeconds = 0;
+    public boolean mobsIgnoreRails = false;
     private void miscGameplayMechanicsSettings() {
         useBetterMending = getBoolean("gameplay-mechanics.use-better-mending", useBetterMending);
         alwaysTameInCreative = getBoolean("gameplay-mechanics.always-tame-in-creative", alwaysTameInCreative);
@@ -153,6 +154,7 @@ public class PurpurWorldConfig {
         voidDamageDealt = getDouble("gameplay-mechanics.void-damage-dealt", voidDamageDealt);
         raidCooldownSeconds = getInt("gameplay-mechanics.raid-cooldown-seconds", raidCooldownSeconds);
         animalBreedingCooldownSeconds = getInt("gameplay-mechanics.animal-breeding-cooldown-seconds", animalBreedingCooldownSeconds);
+        mobsIgnoreRails = getBoolean("gameplay-mechanics.mobs-ignore-rails", mobsIgnoreRails);
     }
 
     public int daytimeTicks = 12000;