Create a way to add extra ingredients in the API (not at runtime)

CommonApi/src/main/java/mezz/jei/api/IModPlugin.java

@@ -8,6 +8,7 @@
 import net.minecraft.resources.ResourceLocation;
 
 import mezz.jei.api.registration.IAdvancedRegistration;
+import mezz.jei.api.registration.IExtraIngredientRegistration;
 import mezz.jei.api.registration.IGuiHandlerRegistration;
 import mezz.jei.api.registration.IModIngredientRegistration;
 import mezz.jei.api.registration.IRecipeCatalystRegistration;
@@ -54,6 +55,16 @@ default void registerIngredients(IModIngredientRegistration registration) {
 
 	}
 
+	/**
+	 * Register extra ItemStacks that are not in the creative menu,
+	 * or FluidStacks that are different from the default ones available via the fluid registry.
+	 *
+	 * @since 19.18.0
+	 */
+	default void registerExtraIngredients(IExtraIngredientRegistration registration) {
+
+	}
+
 	/**
 	 * Register search aliases for ingredients.
 	 *

CommonApi/src/main/java/mezz/jei/api/registration/IExtraIngredientRegistration.java

@@ -0,0 +1,52 @@
+package mezz.jei.api.registration;
+
+import mezz.jei.api.IModPlugin;
+import mezz.jei.api.constants.VanillaTypes;
+import mezz.jei.api.helpers.IColorHelper;
+import mezz.jei.api.helpers.IPlatformFluidHelper;
+import mezz.jei.api.ingredients.IIngredientHelper;
+import mezz.jei.api.ingredients.IIngredientRenderer;
+import mezz.jei.api.ingredients.IIngredientType;
+import mezz.jei.api.ingredients.subtypes.ISubtypeManager;
+import mezz.jei.api.runtime.IIngredientManager;
+import net.minecraft.world.item.ItemStack;
+
+import java.util.Collection;
+
+/**
+ * Allows adding extra ingredients (including ItemStack and FluidStack) for any registered ingredient type.
+ *
+ * This is intended to be used to add ingredients to another mod's type.
+ * If you want to add ingredients to your own custom type,
+ * pass them to {@link IModIngredientRegistration#register} instead.
+ *
+ * This is given to your {@link IModPlugin#registerExtraIngredients(IExtraIngredientRegistration)}.
+ *
+ * @since 19.18.0
+ */
+public interface IExtraIngredientRegistration {
+	/**
+	 * Add extra ItemStacks that are not already in the creative menu.
+	 *
+	 * @param extraItemStacks A collection of extra ItemStacks to be displayed in the ingredient list.
+	 *
+	 * @since 19.18.0
+	 */
+	default void addExtraItemStacks(Collection<ItemStack> extraItemStacks) {
+		addExtraIngredients(VanillaTypes.ITEM_STACK, extraItemStacks);
+	}
+
+	/**
+	 * Add extra ingredients to an existing ingredient type.
+	 *
+	 * @param ingredientType     The type of the ingredient.
+	 *                           This must already be registered with {@link IModIngredientRegistration#register} by another mod.
+	 * @param extraIngredients   A collection of extra ingredients to be displayed in the ingredient list.
+	 *
+	 * @since 19.18.0
+	 */
+	<V> void addExtraIngredients(
+		IIngredientType<V> ingredientType,
+		Collection<V> extraIngredients
+	);
+}

CommonApi/src/main/java/mezz/jei/api/runtime/IIngredientManager.java

@@ -11,6 +11,7 @@
 import mezz.jei.api.ingredients.IIngredientTypeWithSubtypes;
 import mezz.jei.api.ingredients.ITypedIngredient;
 import mezz.jei.api.ingredients.subtypes.UidContext;
+import mezz.jei.api.registration.IExtraIngredientRegistration;
 import mezz.jei.api.registration.IIngredientAliasRegistration;
 import net.minecraft.world.item.ItemStack;
 import org.jetbrains.annotations.Unmodifiable;
@@ -86,6 +87,10 @@ default Collection<ItemStack> getAllItemStacks() {
 	/**
 	 * Add new ingredients to JEI at runtime.
 	 * Used by mods that have items created while the game is running, or use the server to define items.
+	 *
+	 * If you just want to add ingredients to an existing type
+	 * (like adding more ItemStacks or FluidStacks, not at runtime),
+	 * use {@link IExtraIngredientRegistration#addExtraIngredients} instead.
 	 */
 	<V> void addIngredientsAtRuntime(IIngredientType<V> ingredientType, Collection<V> ingredients);
 

Library/src/main/java/mezz/jei/library/load/PluginLoader.java

@@ -84,6 +84,7 @@ public PluginLoader(
 
 		IngredientManagerBuilder ingredientManagerBuilder = new IngredientManagerBuilder(subtypeManager, colorHelper);
 		PluginCaller.callOnPlugins("Registering ingredients", plugins, p -> p.registerIngredients(ingredientManagerBuilder));
+		PluginCaller.callOnPlugins("Registering extra ingredients", plugins, p -> p.registerExtraIngredients(ingredientManagerBuilder));
 
 		if (ingredientFilterConfig.getSearchIngredientAliases()) {
 			PluginCaller.callOnPlugins("Registering search ingredient aliases", plugins, p -> p.registerIngredientAliases(ingredientManagerBuilder));

Library/src/main/java/mezz/jei/library/load/registration/IngredientManagerBuilder.java

@@ -8,6 +8,7 @@
 import mezz.jei.api.ingredients.IIngredientType;
 import mezz.jei.api.ingredients.ITypedIngredient;
 import mezz.jei.api.ingredients.subtypes.ISubtypeManager;
+import mezz.jei.api.registration.IExtraIngredientRegistration;
 import mezz.jei.api.registration.IIngredientAliasRegistration;
 import mezz.jei.api.registration.IModIngredientRegistration;
 import mezz.jei.api.runtime.IIngredientManager;
@@ -20,7 +21,7 @@
 import java.util.LinkedHashMap;
 import java.util.SequencedMap;
 
-public class IngredientManagerBuilder implements IModIngredientRegistration, IIngredientAliasRegistration {
+public class IngredientManagerBuilder implements IModIngredientRegistration, IIngredientAliasRegistration, IExtraIngredientRegistration {
 	private final SequencedMap<IIngredientType<?>, IngredientInfo<?>> ingredientInfos = new LinkedHashMap<>();
 	private final ISubtypeManager subtypeManager;
 	private final IColorHelper colorHelper;
@@ -46,7 +47,7 @@ public <V> void register(IIngredientType<V> ingredientType, Collection<V> allIng
 				"ingredients in the ingredient list, and it must have a height of 16"
 		);
 		if (ingredientInfos.containsKey(ingredientType)) {
-			throw new IllegalArgumentException("Ingredient type has already been registered: " + ingredientType.getIngredientClass());
+			throw new IllegalArgumentException("Ingredient type has already been registered: " + ingredientType.getUid());
 		}
 
 		ingredientInfos.put(ingredientType, new IngredientInfo<>(ingredientType, allIngredients, ingredientHelper, ingredientRenderer, null));
@@ -81,6 +82,20 @@ public <V> void register(
 		ingredientInfos.put(ingredientType, new IngredientInfo<>(ingredientType, allIngredients, ingredientHelper, ingredientRenderer, ingredientCodec));
 	}
 
+	@Override
+	public <V> void addExtraIngredients(IIngredientType<V> ingredientType, Collection<V> extraIngredients) {
+		ErrorUtil.checkNotNull(ingredientType, "ingredientType");
+		ErrorUtil.checkNotNull(extraIngredients, "extraIngredients");
+
+		IngredientInfo<?> ingredientInfo = ingredientInfos.get(ingredientType);
+		if (ingredientInfo == null) {
+			throw new IllegalArgumentException("Ingredient type has not been registered: " + ingredientType.getUid());
+		}
+		@SuppressWarnings("unchecked")
+		IngredientInfo<V> castIngredientInfo = (IngredientInfo<V>) ingredientInfo;
+		castIngredientInfo.addIngredients(extraIngredients);
+	}
+
 	@Override
 	public <I> void addAlias(IIngredientType<I> type, I ingredient, String alias) {
 		ErrorUtil.checkNotNull(type, "type");

Library/src/main/java/mezz/jei/library/plugins/debug/JeiDebugPlugin.java

@@ -13,6 +13,7 @@
 import mezz.jei.api.ingredients.IIngredientTypeWithSubtypes;
 import mezz.jei.api.ingredients.ITypedIngredient;
 import mezz.jei.api.registration.IAdvancedRegistration;
+import mezz.jei.api.registration.IExtraIngredientRegistration;
 import mezz.jei.api.registration.IGuiHandlerRegistration;
 import mezz.jei.api.registration.IIngredientAliasRegistration;
 import mezz.jei.api.registration.IModInfoRegistration;
@@ -90,6 +91,13 @@ public void registerIngredients(IModIngredientRegistration registration) {
 		}
 	}
 
+	@Override
+	public void registerExtraIngredients(IExtraIngredientRegistration registration) {
+		if (DebugConfig.isDebugModeEnabled()) {
+			registration.addExtraIngredients(DebugIngredient.TYPE, DebugIngredientListFactory.create(0, 10));
+		}
+	}
+
 	@Override
 	public void registerIngredientAliases(IIngredientAliasRegistration registration) {
 		registration.addAlias(
@@ -357,7 +365,7 @@ public void onRuntimeAvailable(IJeiRuntime jeiRuntime) {
 				debugRecipeCategory.setRuntime(jeiRuntime);
 			}
 			IIngredientManager ingredientManager = jeiRuntime.getIngredientManager();
-			ingredientManager.addIngredientsAtRuntime(DebugIngredient.TYPE, DebugIngredientListFactory.create());
+			ingredientManager.addIngredientsAtRuntime(DebugIngredient.TYPE, DebugIngredientListFactory.create(10, 20));
 		}
 	}
 }

Library/src/main/java/mezz/jei/library/plugins/debug/ingredients/DebugIngredientListFactory.java

@@ -8,9 +8,9 @@ public final class DebugIngredientListFactory {
 	private DebugIngredientListFactory() {
 	}
 
-	public static Collection<DebugIngredient> create() {
+	public static Collection<DebugIngredient> create(int start, int end) {
 		List<DebugIngredient> ingredients = new ArrayList<>();
-		for (int i = 0; i < 10; i++) {
+		for (int i = start; i < end; i++) {
 			DebugIngredient debugIngredient = new DebugIngredient(i);
 			ingredients.add(debugIngredient);
 		}

gradle.properties

@@ -74,4 +74,4 @@ modrinthId=u6dRKJwZ
 jUnitVersion=5.8.2
 
 # Version
-specificationVersion=19.17.0
+specificationVersion=19.18.0