Add function to add items with the same behavior as the pumpkin for enderman (#6890)

patches/minecraft/net/minecraft/entity/monster/EndermanEntity.java.patch

@@ -16,6 +16,15 @@
     }
  
     protected void func_70088_a() {
+@@ -188,7 +188,7 @@
+ 
+    private boolean func_70821_d(PlayerEntity p_70821_1_) {
+       ItemStack itemstack = p_70821_1_.field_71071_by.field_70460_b.get(3);
+-      if (itemstack.func_77973_b() == Blocks.field_196625_cS.func_199767_j()) {
++      if (itemstack.isEnderMask(p_70821_1_, this)) {
+          return false;
+       } else {
+          Vector3d vector3d = p_70821_1_.func_70676_i(1.0F).func_72432_b();
 @@ -267,7 +267,9 @@
        boolean flag = blockstate.func_185904_a().func_76230_c();
        boolean flag1 = blockstate.func_204520_s().func_206884_a(FluidTags.field_206959_a);

src/main/java/net/minecraftforge/common/extensions/IForgeItem.java

@@ -28,6 +28,7 @@ import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Multimap;
 
 import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
 import net.minecraft.client.renderer.entity.model.BipedModel;
 import net.minecraft.client.renderer.tileentity.ItemStackTileEntityRenderer;
 import net.minecraft.entity.Entity;
@@ -36,6 +37,7 @@ import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.ai.attributes.Attribute;
 import net.minecraft.entity.ai.attributes.AttributeModifier;
 import net.minecraft.entity.item.ItemEntity;
+import net.minecraft.entity.monster.EndermanEntity;
 import net.minecraft.entity.monster.piglin.PiglinTasks;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ArmorItem;
@@ -814,4 +816,18 @@ public interface IForgeItem
     default <T extends LivingEntity> int damageItem(ItemStack stack, int amount, T entity, Consumer<T> onBroken) {
         return amount;
     }
+
+    /**
+     * Whether this Item can be used to hide player head for enderman.
+     *
+     * @param stack the ItemStack
+     * @param player The player watching the enderman
+     * @param endermanEntity The enderman that the player look
+     * @return true if this Item can be used to hide player head for enderman
+     */
+    default boolean isEnderMask(ItemStack stack, PlayerEntity player, EndermanEntity endermanEntity)
+    {
+        return stack.getItem() == Blocks.CARVED_PUMPKIN.asItem();
+    }
+
 }

src/main/java/net/minecraftforge/common/extensions/IForgeItemStack.java

@@ -23,6 +23,7 @@ import java.util.Set;
 
 import javax.annotation.Nullable;
 
+import net.minecraft.entity.monster.EndermanEntity;
 import net.minecraft.util.CachedBlockInfo;
 import net.minecraft.block.BlockState;
 import net.minecraft.enchantment.Enchantment;
@@ -473,4 +474,16 @@ public interface IForgeItemStack extends ICapabilitySerializable<CompoundNBT>
     {
         return getStack().getItem().makesPiglinsNeutral(getStack(), wearer);
     }
+
+    /**
+     * Whether this Item can be used to hide player head for enderman.
+     *
+     * @param player The player watching the enderman
+     * @param endermanEntity The enderman that the player look
+     * @return true if this Item can be used.
+     */
+    default boolean isEnderMask(PlayerEntity player, EndermanEntity endermanEntity)
+    {
+        return getStack().getItem().isEnderMask(getStack(), player, endermanEntity);
+    }
 }

src/test/java/net/minecraftforge/debug/item/EnderMaskTest.java

@@ -0,0 +1,36 @@
+package net.minecraftforge.debug.item;
+
+import net.minecraft.entity.monster.EndermanEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.inventory.EquipmentSlotType;
+import net.minecraft.item.*;
+import net.minecraftforge.eventbus.api.IEventBus;
+import net.minecraftforge.fml.RegistryObject;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
+import net.minecraftforge.registries.DeferredRegister;
+import net.minecraftforge.registries.ForgeRegistries;
+
+@Mod(EnderMaskTest.MODID)
+public class EnderMaskTest
+{
+    public static final String MODID = "ender_mask_test";
+    public static final DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, MODID);
+
+    public static RegistryObject<Item> ender_mask = ITEMS.register("ender_mask", () ->
+            new ArmorItem(ArmorMaterial.LEATHER, EquipmentSlotType.HEAD, (new Item.Properties().group(ItemGroup.MISC)))
+            {
+                @Override
+                public boolean isEnderMask(ItemStack stack, PlayerEntity player, EndermanEntity endermanEntity)
+                {
+                    return player.experienceLevel > 10;
+                }
+            }
+    );
+
+    public EnderMaskTest()
+    {
+        IEventBus modEventBus = FMLJavaModLoadingContext.get().getModEventBus();
+        ITEMS.register(modEventBus);
+    }
+}

src/test/resources/META-INF/mods.toml

@@ -67,4 +67,6 @@ loaderVersion="[28,)"
 [[mods]]
     modId="deferred_registry_test"
 [[mods]]
-    modId="create_entity_classification_test"
+    modId="create_entity_classification_test"
+[[mods]]
+    modId="ender_mask_test"