ItemGroup info on getItemDetail (#1127)

src/main/java/dan200/computercraft/shared/peripheral/generic/data/ItemData.java

@@ -10,6 +10,7 @@ import dan200.computercraft.shared.util.NBTUtil;
 import net.minecraft.enchantment.Enchantment;
 import net.minecraft.enchantment.EnchantmentHelper;
 import net.minecraft.item.EnchantedBookItem;
+import net.minecraft.item.ItemGroup;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.CompoundNBT;
 import net.minecraft.nbt.INBT;
@@ -67,6 +68,7 @@ public class ItemData
         }
 
         data.put( "tags", DataHelpers.getTags( stack.getItem().getTags() ) );
+        data.put( "itemGroups", getItemGroups( stack ) );
 
         CompoundNBT tag = stack.getTag();
         if( tag != null && tag.contains( "display", Constants.NBT.TAG_COMPOUND ) )
@@ -116,6 +118,30 @@ public class ItemData
         }
     }
 
+    /**
+     * Retrieve all item groups an item stack pertains to.
+     *
+     * @param stack Stack to analyse
+     * @return A filled list that contains pairs of item group IDs and their display names.
+     */
+    @Nonnull
+    private static List<Map<String, Object>> getItemGroups( @Nonnull ItemStack stack )
+    {
+        List<Map<String, Object>> groups = new ArrayList<>( 1 );
+
+        for( ItemGroup group : stack.getItem().getCreativeTabs() )
+        {
+            if( group == null ) continue;
+
+            Map<String, Object> groupData = new HashMap<>( 2 );
+            groupData.put( "id", group.langId );
+            groupData.put( "displayName", group.displayName.getString() );
+            groups.add( groupData );
+        }
+
+        return groups;
+    }
+
     /**
      * Retrieve all visible enchantments from given stack. Try to follow all tooltip rules : order and visibility.
      *

src/main/java/dan200/computercraft/shared/peripheral/generic/methods/InventoryMethods.java

@@ -107,7 +107,9 @@ public class InventoryMethods implements GenericPeripheral
      *
      * The returned information contains the same information as each item in
      * {@link #list}, as well as additional details like the display name
-     * (`displayName`) and item durability (`damage`, `maxDamage`, `durability`).
+     * (`displayName`), item groups (`itemGroups`), which are the creative tabs
+     * an item will appear under, and item and item durability (`damage`,
+     * `maxDamage`, `durability`).
      *
      * Some items include more information (such as enchantments) - it is
      * recommended to print it out using @{textutils.serialize} or in the Lua
@@ -127,6 +129,11 @@ public class InventoryMethods implements GenericPeripheral
      *
      * print(("%s (%s)"):format(item.displayName, item.name))
      * print(("Count: %d/%d"):format(item.count, item.maxCount))
+     *
+     * for _, group in pairs(item.itemGroups) do
+     *   print(("Group: %s"):format(group.displayName))
+     * end
+     *
      * if item.damage then
      *   print(("Damage: %d/%d"):format(item.damage, item.maxDamage))
      * end

src/main/resources/META-INF/accesstransformer.cfg

@@ -11,3 +11,7 @@ public net.minecraft.client.Minecraft field_71462_r # currentScreen
 # SpeakerInstance/SpeakerManager
 public net.minecraft.client.audio.SoundSource func_216421_a(I)V # pumpBuffers
 public net.minecraft.client.audio.SoundEngine field_217940_j # executor
+
+# ItemData
+public net.minecraft.item.ItemGroup field_78034_o # langId
+public net.minecraft.item.ItemGroup field_242391_q # displayName