From 9f450f16e1e3907c45fd8b045979049fe1f083ae 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 c7cde1d0a0..7ca67a4aa5 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -663,4 +663,9 @@ public class PaperWorldConfig {
     private void nerfNetherPortalPigmen() {
         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);
+    }
 }
diff --git a/src/main/java/net/minecraft/server/EntityZombie.java b/src/main/java/net/minecraft/server/EntityZombie.java
index 8635d4f40c..07ebc1d816 100644
--- a/src/main/java/net/minecraft/server/EntityZombie.java
+++ b/src/main/java/net/minecraft/server/EntityZombie.java
@@ -455,10 +455,14 @@ public class EntityZombie extends EntityMonster {
     @Override
     public void b(EntityLiving entityliving) {
         super.b(entityliving);
-        if ((this.world.getDifficulty() == EnumDifficulty.NORMAL || this.world.getDifficulty() == EnumDifficulty.HARD) && entityliving instanceof EntityVillager) {
-            if (this.world.getDifficulty() != EnumDifficulty.HARD && this.random.nextBoolean()) {
+        // Paper start
+        if (world.paperConfig.zombieVillagerInfectionChance != 0.0 && (world.paperConfig.zombieVillagerInfectionChance != -1.0 || this.world.getDifficulty() == EnumDifficulty.NORMAL || this.world.getDifficulty() == EnumDifficulty.HARD) && entityliving instanceof EntityVillager) {
+            if (world.paperConfig.zombieVillagerInfectionChance == -1.0 && this.world.getDifficulty() != EnumDifficulty.HARD && this.random.nextBoolean()) {
+                 return;
+             }
+            if (world.paperConfig.zombieVillagerInfectionChance != -1.0 && (this.random.nextDouble() * 100.0) > world.paperConfig.zombieVillagerInfectionChance) {
                 return;
-            }
+            } // Paper end
 
             EntityVillager entityvillager = (EntityVillager) entityliving;
             EntityZombieVillager entityzombievillager = (EntityZombieVillager) EntityTypes.ZOMBIE_VILLAGER.a(this.world);
-- 
2.25.1