From 0000000000000000000000000000000000000000 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 bff2e9d26dc8057c3950d1b57ee2e7469e7f943c..f164844f339793860e773c499443ce160d0a6830 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -312,4 +312,14 @@ 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 3bcf0b385d1f707176dae9c3ee49370e2e6dd481..4764ffef77bf0a73018017a07103186a9ce55b8f 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);