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 2dce801e06687c218be3333ac9f000bae09f0caf..ed9548341eb226cf5a5d2370419a01208cf0f742 100644
--- a/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
+++ b/src/main/java/net/minecraft/world/item/crafting/Ingredient.java
@@ -45,6 +45,7 @@ public final class Ingredient implements Predicate<ItemStack> {
     // CraftBukkit start
     @Nullable
     private List<ItemStack> itemStacks;
+    public Predicate<org.bukkit.inventory.ItemStack> predicate; // Purpur
 
     public boolean isExact() {
         return this.itemStacks != null;
@@ -100,6 +101,11 @@ public final class Ingredient implements Predicate<ItemStack> {
 
             return false;
         }
+        // Purpur start
+        if (predicate != null) {
+            return predicate.test(itemstack.asBukkitCopy());
+        }
+        // Purpur end
         // CraftBukkit end
         List<Holder<Item>> list = this.items();
 
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
index 3592091c6d1371224e82e1f95b003951ad2f8779..4fdc78a9c74b42a8894030221e0452493d68020e 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftRecipe.java
@@ -38,6 +38,7 @@ public interface CraftRecipe extends Recipe {
             stack = Ingredient.of(((RecipeChoice.MaterialChoice) bukkit).getChoices().stream().map((mat) -> CraftItemType.bukkitToMinecraft(mat)));
         } else if (bukkit instanceof RecipeChoice.ExactChoice) {
             stack = Ingredient.ofStacks(((RecipeChoice.ExactChoice) bukkit).getChoices().stream().map((mat) -> CraftItemStack.asNMSCopy(mat)).toList());
+            stack.predicate = ((RecipeChoice.ExactChoice) bukkit).getPredicate(); // Purpur
             // Paper start - support "empty" choices - legacy method that spigot might incorrectly call
             // Their impl of Ingredient.of() will error, ingredients need at least one entry.
             // Callers running into this exception may have passed an incorrect empty() recipe choice to a non-empty slot or