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 e83216be5a00d5b927d8c2fc364551bd3077c974..2dc58b9f769ea43b737804456aafab47ecc143b8 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -314,4 +314,14 @@ 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/LootItemFunctionExplorationMap.java b/src/main/java/net/minecraft/server/LootItemFunctionExplorationMap.java
index 37ebc9f511479778c131e02b6852b27f63e75bdd..6000c7c2fc68427dea343115183b8faacc985514 100644
--- a/src/main/java/net/minecraft/server/LootItemFunctionExplorationMap.java
+++ b/src/main/java/net/minecraft/server/LootItemFunctionExplorationMap.java
@@ -48,6 +48,15 @@ public class LootItemFunctionExplorationMap extends LootItemFunctionConditional
 
             if (vec3d != null) {
                 WorldServer worldserver = loottableinfo.getWorld();
+                // Paper start
+                if (!worldserver.paperConfig.enableTreasureMaps) {
+                    /*
+                     * NOTE: I fear users will just get a plain map as their "treasure"
+                     * This is preferable to disrespecting the config.
+                     */
+                    return itemstack;
+                }
+                // Paper end
                 BlockPosition blockposition = worldserver.a(this.e, new BlockPosition(vec3d), this.h, this.i);
 
                 if (blockposition != null) {
diff --git a/src/main/java/net/minecraft/server/VillagerTrades.java b/src/main/java/net/minecraft/server/VillagerTrades.java
index 4f7944d7fdaf02bae40ee71a18bd1c9bb4eb891b..49f9ae86512ad679aaa71992de2284e024591101 100644
--- a/src/main/java/net/minecraft/server/VillagerTrades.java
+++ b/src/main/java/net/minecraft/server/VillagerTrades.java
@@ -91,7 +91,8 @@ public class VillagerTrades {
                 return null;
             } else {
                 WorldServer worldserver = (WorldServer) entity.world;
-                BlockPosition blockposition = worldserver.a(this.b, entity.getChunkCoordinates(), 100, true);
+                if (!worldserver.paperConfig.enableTreasureMaps) return null; // Paper
+                BlockPosition blockposition = worldserver.a(this.b, entity.getChunkCoordinates(), 100, !worldserver.paperConfig.treasureMapsAlreadyDiscovered); // Paper
 
                 if (blockposition != null) {
                     ItemStack itemstack = ItemWorldMap.createFilledMapView(worldserver, blockposition.getX(), blockposition.getZ(), (byte) 2, true, true);