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/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 19e0532ea296d6862ab6508658726e96e05346c9..b57d9c84db5685b86cb077e3b42db7a8578d6f62 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -451,6 +451,11 @@ public class PaperWorldConfig {
         nerfNetherPortalPigmen = getBoolean("game-mechanics.nerf-pigmen-from-nether-portals", nerfNetherPortalPigmen);
     }
 
+    public double zombieVillagerInfectionChance = -1.0;
+    private void zombieVillagerInfectionChance() {
+        zombieVillagerInfectionChance = getDouble("zombie-villager-infection-chance", zombieVillagerInfectionChance);
+    }
+
     public int lightQueueSize = 20;
     private void lightQueueSize() {
         lightQueueSize = getInt("light-queue-size", lightQueueSize);
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 ee17cba501e0cc4822bd1278d18b561c77fe9674..b036cbb9a1b6bcac91ffc8ee659fc95d6e04d5d4 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Zombie.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
@@ -453,10 +453,13 @@ public class Zombie extends Monster {
     @Override
     public void killed(ServerLevel world, LivingEntity other) {
         super.killed(world, other);
-        if ((world.getDifficulty() == Difficulty.NORMAL || world.getDifficulty() == Difficulty.HARD) && other instanceof Villager) {
-            if (world.getDifficulty() != Difficulty.HARD && this.random.nextBoolean()) {
+        if (level.paperConfig.zombieVillagerInfectionChance != 0.0 && (level.paperConfig.zombieVillagerInfectionChance != -1.0 || world.getDifficulty() == Difficulty.NORMAL || world.getDifficulty() == Difficulty.HARD) && other instanceof Villager) {
+            if (level.paperConfig.zombieVillagerInfectionChance == -1.0 && world.getDifficulty() != Difficulty.HARD && this.random.nextBoolean()) {
                 return;
             }
+            if (level.paperConfig.zombieVillagerInfectionChance != -1.0 && (this.random.nextDouble() * 100.0) > level.paperConfig.zombieVillagerInfectionChance) {
+                return;
+            } // Paper end
 
             Villager entityvillager = (Villager) other;
             // CraftBukkit start