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 c84fd369d92932903c76bb2012602617d3e2d213..f6291ff377b38cb84692a9fd564b4b1a9780cf4f 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 ((node == null || node.costMalus < 0.0F)
                     && maxYStep > 0
                     && (pathType != PathType.FENCE || this.canWalkOverFences())
-                    && pathType != PathType.UNPASSABLE_RAIL
+                    && (this.mob.level().purpurConfig.mobsIgnoreRails || pathType != PathType.UNPASSABLE_RAIL) // Purpur
                     && pathType != PathType.TRAPDOOR
                     && pathType != PathType.POWDER_SNOW) {
                     node = this.tryJumpOn(x, y, z, maxYStep, prevFeetY, direction, nodeType, mutableBlockPos);
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index 4f3a1e897834f1ea7c4de04651489351f6407be3..aa49d0b5c1e21172af898648a0fe1ff65da7d7a9 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -138,6 +138,7 @@ public class PurpurWorldConfig {
     public boolean imposeTeleportRestrictionsOnEndPortals = false;
     public boolean tickFluids = true;
     public double mobsBlindnessMultiplier = 1;
+    public boolean mobsIgnoreRails = false;
     private void miscGameplayMechanicsSettings() {
         useBetterMending = getBoolean("gameplay-mechanics.use-better-mending", useBetterMending);
         alwaysTameInCreative = getBoolean("gameplay-mechanics.always-tame-in-creative", alwaysTameInCreative);
@@ -158,6 +159,7 @@ public class PurpurWorldConfig {
         imposeTeleportRestrictionsOnEndPortals = getBoolean("gameplay-mechanics.impose-teleport-restrictions-on-end-portals", imposeTeleportRestrictionsOnEndPortals);
         tickFluids = getBoolean("gameplay-mechanics.tick-fluids", tickFluids);
         mobsBlindnessMultiplier = getDouble("gameplay-mechanics.entity-blindness-multiplier", mobsBlindnessMultiplier);
+        mobsIgnoreRails = getBoolean("gameplay-mechanics.mobs-ignore-rails", mobsIgnoreRails);
     }
 
     public int daytimeTicks = 12000;