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 06fe5b056d78d42cdf78437eeabe1786d596b7f8..3532db21cee82c18f95c540d24b2071585d71c4e 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; // Purpur
     public static final Codec<Ingredient> CODEC = Ingredient.codec(true);
     public static final Codec<Ingredient> CODEC_NONEMPTY = Ingredient.codec(false);
 
@@ -70,6 +71,12 @@ 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);
         }