From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <Blake.Galbreath@GMail.com>
Date: Sat, 3 Oct 2020 17:40:52 -0500
Subject: [PATCH] Add predicate to recipe's ExactChoice ingredient


diff --git a/src/main/java/net/minecraft/world/item/crafting/Ingredient.java b/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
index cd7ea0c16f9ddcb84b5d7e8a2533e6e84f3879c7..3ca086418ad037c48775db73d2b9c410acf1e326 100644
--- a/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
+++ b/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
@@ -39,6 +39,7 @@ public final class Ingredient implements Predicate<ItemStack> {
     @Nullable
     private IntList stackingIds;
     public boolean exact; // CraftBukkit
+    public Predicate<org.bukkit.inventory.ItemStack> predicate;
 
     public Ingredient(Stream<? extends Ingredient.Value> entries) {
         this.values = (Ingredient.Value[]) entries.toArray((i) -> {
@@ -64,6 +65,12 @@ public final class Ingredient implements Predicate<ItemStack> {
         } else if (this.isEmpty()) {
             return itemstack.isEmpty();
         } else {
+            // Purpur start
+            if (predicate != null) {
+                return predicate.test(itemstack.asBukkitCopy());
+            }
+            // Purpur end
+
             ItemStack[] aitemstack = this.getItems();
             int i = aitemstack.length;
 
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
index 13d25d118eb4d3ef35a4cdfb9bbde9ed83f6c04b..553ecc9b5631ffc0848a798bb3295f16d1722c1f 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
@@ -30,6 +30,7 @@ public interface CraftRecipe extends Recipe {
         } else if (bukkit instanceof RecipeChoice.ExactChoice) {
             stack = new Ingredient(((RecipeChoice.ExactChoice) bukkit).getChoices().stream().map((mat) -> new net.minecraft.world.item.crafting.Ingredient.ItemValue(CraftItemStack.asNMSCopy(mat))));
             stack.exact = true;
+            stack.predicate = ((RecipeChoice.ExactChoice) bukkit).getPredicate(); // Purpur
         } else {
             throw new IllegalArgumentException("Unknown recipe stack instance " + bukkit);
         }