From 5e91efb7e5cb6a3812d67220724b1b343ea142bd 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 73bf74422..a655b3310 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -399,4 +399,14 @@ 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 4ad75468c..ac6e2a9aa 100644
--- a/src/main/java/net/minecraft/server/EntityVillager.java
+++ b/src/main/java/net/minecraft/server/EntityVillager.java
@@ -761,7 +761,8 @@ 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.t_();
-            BlockPosition blockposition = world.a(this.b, imerchant.u_(), true);
+            if (!world.paperConfig.enableTreasureMaps) return; // Paper
+            BlockPosition blockposition = world.a(this.b, imerchant.u_(), !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);
-- 
2.11.0