From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zero <zero@cock.li>
Date: Sat, 22 Feb 2020 16:10:31 -0500
Subject: [PATCH] Configurable chance of villager zombie infection

This allows you to solve an issue in vanilla behavior where:
* On easy difficulty your villagers will NEVER get infected, meaning they will always die.
* On normal difficulty they will have a 50% of getting infected or dying.

diff --git a/src/main/java/net/minecraft/world/entity/monster/Zombie.java b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
index 2be074ecbc131b68574cf77ba9cab96424715522..4215c45aa1073b3c70eb58a06eb3dce26f389c90 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Zombie.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
@@ -452,12 +452,8 @@ public class Zombie extends Monster {
     public boolean killedEntity(ServerLevel world, LivingEntity other) {
         boolean flag = super.killedEntity(world, other);
 
-        if ((world.getDifficulty() == Difficulty.NORMAL || world.getDifficulty() == Difficulty.HARD) && other instanceof Villager) {
-            Villager entityvillager = (Villager) other;
-
-            if (world.getDifficulty() != Difficulty.HARD && this.random.nextBoolean()) {
-                return flag;
-            }
+        final double fallbackChance = world.getDifficulty() == Difficulty.HARD ? 1d : world.getDifficulty() == Difficulty.NORMAL ? 0.5d : 0d; // Paper
+        if (this.random.nextDouble() < world.paperConfig().entities.behavior.zombieVillagerInfectionChance.or(fallbackChance) && other instanceof Villager entityvillager) { // Paper
             // CraftBukkit start
             flag = Zombie.zombifyVillager(world, entityvillager, this.blockPosition(), this.isSilent(), CreatureSpawnEvent.SpawnReason.INFECTION) == null;
         }