From 960bf7841f506ecc2d545186199d23b6852ee8db Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 20 Dec 2016 15:26:27 -0500
Subject: [PATCH] Configurable Cartographer Treasure Maps

Allow configuring for cartographers to return the same map location

Also allow turning off treasure maps all together as they can eat up Map ID's
which are limited in quantity.

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 513c4b020..631aa6eb9 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -393,4 +393,14 @@ public class PaperWorldConfig {
             Bukkit.getLogger().warning("Spawn Egg and Armor Stand NBT filtering disabled, this is a potential security risk");
         }
     }
+
+    public boolean enableTreasureMaps = true;
+    public boolean treasureMapsAlreadyDiscovered = false;
+    private void treasureMapsAlreadyDiscovered() {
+        enableTreasureMaps = getBoolean("enable-treasure-maps", true);
+        treasureMapsAlreadyDiscovered = getBoolean("treasure-maps-return-already-discovered", false);
+        if (treasureMapsAlreadyDiscovered) {
+            log("Treasure Maps will return already discovered locations");
+        }
+    }
 }
diff --git a/src/main/java/net/minecraft/server/EntityVillager.java b/src/main/java/net/minecraft/server/EntityVillager.java
index 09b466fcb..df009e190 100644
--- a/src/main/java/net/minecraft/server/EntityVillager.java
+++ b/src/main/java/net/minecraft/server/EntityVillager.java
@@ -767,7 +767,8 @@ public class EntityVillager extends EntityAgeable implements NPC, IMerchant {
         public void a(IMerchant imerchant, MerchantRecipeList merchantrecipelist, Random random) {
             int i = this.a.a(random);
             World world = imerchant.u_();
-            BlockPosition blockposition = world.a(this.b, imerchant.v_(), true);
+            if (!world.paperConfig.enableTreasureMaps) return; //Paper
+            BlockPosition blockposition = world.a(this.b, imerchant.v_(), world.paperConfig.treasureMapsAlreadyDiscovered); // Paper - pass false to return first structure, regardless of if its been discovered. true returns only undiscovered.
 
             if (blockposition != null) {
                 ItemStack itemstack = ItemWorldMap.a(world, (double) blockposition.getX(), (double) blockposition.getZ(), (byte) 2, true, true);
-- 
2.16.1