From c9189373d0a6be8feecbbf1ce54c9ba3c893d538 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Tue, 22 Mar 2016 12:04:28 -0500
Subject: [PATCH] Configurable spawn chances for skeleton horses


diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 26c1b72..55b211e 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -291,4 +291,9 @@ public class PaperWorldConfig {
         }
         log("Non Player Arrow Despawn Rate: " + nonPlayerArrowDespawnRate);
     }
+
+    public double skeleHorseSpawnChance;
+    private void skeleHorseSpawnChance() {
+        skeleHorseSpawnChance = getDouble("skeleton-horse-thunder-spawn-chance", -1.0D); // -1.0D represents a "vanilla" state
+    }
 }
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index c5b08f9..7239f99 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -429,7 +429,10 @@ public class WorldServer extends World implements IAsyncTaskHandler {
                     if (this.isRainingAt(blockposition)) {
                         DifficultyDamageScaler difficultydamagescaler = this.D(blockposition);
 
-                        if (this.random.nextDouble() < (double) difficultydamagescaler.b() * 0.05D) {
+                        // Paper start - Configurable skeleton horse spawn chance
+                        double chance = this.paperConfig.skeleHorseSpawnChance == -1.0D ? (double) difficultydamagescaler.b() * 0.05D : this.paperConfig.skeleHorseSpawnChance;
+                        if (this.random.nextDouble() < chance) {
+                            // Paper end
                             EntityHorse entityhorse = new EntityHorse(this);
 
                             entityhorse.setType(EnumHorseType.SKELETON);
-- 
2.8.0