From 6a2c7cb959467d46b721e83a2f25eef3a9a12cf5 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 ba8edcf7e..bf11448bc 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -310,4 +310,14 @@ 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/VillagerTrades.java b/src/main/java/net/minecraft/server/VillagerTrades.java
index 3bcf0b385..4764ffef7 100644
--- a/src/main/java/net/minecraft/server/VillagerTrades.java
+++ b/src/main/java/net/minecraft/server/VillagerTrades.java
@@ -92,7 +92,8 @@ public class VillagerTrades {
                 return null;
             } else {
                 WorldServer worldserver = (WorldServer) entity.world;
-                BlockPosition blockposition = worldserver.a(this.b, new BlockPosition(entity), 100, true);
+                if (!worldserver.paperConfig.enableTreasureMaps) return null; //Paper
+                BlockPosition blockposition = worldserver.a(this.b, new BlockPosition(entity), 100, !worldserver.paperConfig.treasureMapsAlreadyDiscovered); //Paper
 
                 if (blockposition != null) {
                     ItemStack itemstack = ItemWorldMap.createFilledMapView(worldserver, blockposition.getX(), blockposition.getZ(), (byte) 2, true, true);
-- 
2.17.1