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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -0,0 +0,0 @@ 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/world/entity/npc/VillagerTrades.java b/src/main/java/net/minecraft/world/entity/npc/VillagerTrades.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/entity/npc/VillagerTrades.java
+++ b/src/main/java/net/minecraft/world/entity/npc/VillagerTrades.java
@@ -0,0 +0,0 @@ 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);
diff --git a/src/main/java/net/minecraft/world/level/storage/loot/functions/LootItemFunctionExplorationMap.java b/src/main/java/net/minecraft/world/level/storage/loot/functions/LootItemFunctionExplorationMap.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/level/storage/loot/functions/LootItemFunctionExplorationMap.java
+++ b/src/main/java/net/minecraft/world/level/storage/loot/functions/LootItemFunctionExplorationMap.java
@@ -0,0 +0,0 @@ public class LootItemFunctionExplorationMap extends LootItemFunctionConditional
 
             if (vec3d != null) {
                 WorldServer worldserver = loottableinfo.getWorld();
-                BlockPosition blockposition = worldserver.a(this.e, new BlockPosition(vec3d), this.h, this.i);
+                // 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, !worldserver.paperConfig.treasureMapsAlreadyDiscovered && this.i); // Paper
 
                 if (blockposition != null) {
                     ItemStack itemstack1 = ItemWorldMap.createFilledMapView(worldserver, blockposition.getX(), blockposition.getZ(), this.g, true, true);