From 5fde04fa7eb04056763689b50cd583be287fd33c Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Thu, 1 Aug 2019 19:15:12 -0500
Subject: [PATCH] Add blacklist option for grindstone

---
 .../minecraft/server/ContainerGrindstone.java   | 17 +++++++++++++++++
 .../java/net/minecraft/server/ItemStack.java    |  6 ++++++
 src/main/java/net/pl3x/purpur/PurpurConfig.java | 12 ++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/src/main/java/net/minecraft/server/ContainerGrindstone.java b/src/main/java/net/minecraft/server/ContainerGrindstone.java
index ed88e208d0..0a5abd2e10 100644
--- a/src/main/java/net/minecraft/server/ContainerGrindstone.java
+++ b/src/main/java/net/minecraft/server/ContainerGrindstone.java
@@ -57,12 +57,24 @@ public class ContainerGrindstone extends Container {
         this.a(new Slot(this.craftInventory, 0, 49, 19) {
             @Override
             public boolean isAllowed(ItemStack itemstack) {
+                // Purpur start
+                if (net.pl3x.purpur.PurpurConfig.grindstoneBlacklistDisallowPlacement && net.pl3x.purpur.PurpurConfig.grindstoneBlacklist.contains(itemstack.getId())) {
+                    getBukkitView().getTopInventory().getViewers().forEach(viewer -> ((Player) viewer).updateInventory());
+                    return false;
+                }
+                // Purpur end
                 return itemstack.e() || itemstack.getItem() == Items.ENCHANTED_BOOK || itemstack.hasEnchantments();
             }
         });
         this.a(new Slot(this.craftInventory, 1, 49, 40) {
             @Override
             public boolean isAllowed(ItemStack itemstack) {
+                // Purpur start
+                if (net.pl3x.purpur.PurpurConfig.grindstoneBlacklistDisallowPlacement && net.pl3x.purpur.PurpurConfig.grindstoneBlacklist.contains(itemstack.getId())) {
+                    getBukkitView().getTopInventory().getViewers().forEach(viewer -> ((Player) viewer).updateInventory());
+                    return false;
+                }
+                // Purpur end
                 return itemstack.e() || itemstack.getItem() == Items.ENCHANTED_BOOK || itemstack.hasEnchantments();
             }
         });
@@ -106,6 +118,11 @@ public class ContainerGrindstone extends Container {
             }
 
             private int e(ItemStack itemstack) {
+                // Purpur start
+                if (net.pl3x.purpur.PurpurConfig.grindstoneBlacklistReturnsZeroExp && net.pl3x.purpur.PurpurConfig.grindstoneBlacklist.contains(itemstack.getId())) {
+                    return 0;
+                }
+                // Purpur end
                 int j = 0;
                 Map<Enchantment, Integer> map = EnchantmentManager.a(itemstack);
                 Iterator iterator = map.entrySet().iterator();
diff --git a/src/main/java/net/minecraft/server/ItemStack.java b/src/main/java/net/minecraft/server/ItemStack.java
index 43e89b99b1..e538ba3991 100644
--- a/src/main/java/net/minecraft/server/ItemStack.java
+++ b/src/main/java/net/minecraft/server/ItemStack.java
@@ -538,6 +538,12 @@ public final class ItemStack {
         return !this.e() ? this.doMaterialsMatch(itemstack) : !itemstack.isEmpty() && this.getItem() == itemstack.getItem();
     }
 
+    // Purpur start
+    public String getId() {
+        return IRegistry.ITEM.getKey(getItem()).toString();
+    }
+    // Purpur end
+
     public String j() {
         return this.getItem().f(this);
     }
diff --git a/src/main/java/net/pl3x/purpur/PurpurConfig.java b/src/main/java/net/pl3x/purpur/PurpurConfig.java
index 22df3577cc..0fa7faa996 100644
--- a/src/main/java/net/pl3x/purpur/PurpurConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurConfig.java
@@ -1,6 +1,7 @@
 package net.pl3x.purpur;
 
 import com.google.common.base.Throwables;
+import com.google.common.collect.Lists;
 import net.minecraft.server.Block;
 import net.minecraft.server.IRegistry;
 import net.minecraft.server.MinecraftKey;
@@ -171,6 +172,17 @@ public class PurpurConfig {
         updatePermissionsOnWorldChange = getBoolean("settings.update-perms-on-world-change", updatePermissionsOnWorldChange);
     }
 
+    public static boolean grindstoneBlacklistDisallowPlacement = true;
+    public static boolean grindstoneBlacklistReturnsZeroExp = true;
+    public static List<String> grindstoneBlacklist = Lists.newArrayList("minecraft:tripwire_hook");
+    private static void grindstoneBlacklist() {
+        grindstoneBlacklistDisallowPlacement = getBoolean("settings.grindstone.disallow-placement", grindstoneBlacklistDisallowPlacement);
+        grindstoneBlacklistReturnsZeroExp = getBoolean("settings.grindstone.returns-zero-exp", grindstoneBlacklistReturnsZeroExp);
+        List<String> blacklist = getList("settings.grindstone.blacklisted-items", grindstoneBlacklist);
+        grindstoneBlacklist.clear();
+        grindstoneBlacklist.addAll(blacklist);
+    }
+
     public static boolean requireShiftToMount = true;
     private static void requireShiftToMount() {
         requireShiftToMount = getBoolean("settings.mobs.require-shift-to-mount", requireShiftToMount);
-- 
2.24.0.rc1