Add IChiselItem#canChisel for stacks in the GUI

src/main/java/com/cricketcraft/chisel/api/IChiselItem.java

@@ -40,6 +40,25 @@ public interface IChiselItem extends IChiselMode {
 	 */
 	void onChisel(World world, IInventory inv, int slot, ItemStack chisel, ItemStack target);
 
+	/**
+	 * Called to check if this {@link ItemStack} can be chiseled in this chisel. If not, there will be no possible variants displayed in the GUI.
+	 * <p>
+	 * It is not necessary to take into account whether this item <i>has</i> any variants, this method will only be called after that check.
+	 * 
+	 * @param world
+	 *            {@link World} object
+	 * @param inv
+	 *            The inventory this chisel is currently in
+	 * @param slot
+	 *            The slot index of the chisel in the inventory
+	 * @param chisel
+	 *            The {@link ItemStack} representing the chisel
+	 * @param target
+	 *            The {@link ItemStack} representing the target item
+	 * @return True if the current target can be chiseled into anything. False otherwise.
+	 */
+	boolean canChisel(World world, IInventory inv, int slot, ItemStack chisel, ItemStack target);
+
 	/**
 	 * Allows you to control if your item can chisel this block in the world.
 	 * 

src/main/java/com/cricketcraft/chisel/inventory/InventoryChiselSelection.java

@@ -8,6 +8,7 @@ import net.minecraft.inventory.IInventory;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 
+import com.cricketcraft.chisel.api.IChiselItem;
 import com.cricketcraft.chisel.item.chisel.ItemChisel;
 
 public class InventoryChiselSelection implements IInventory {
@@ -119,6 +120,9 @@ public class InventoryChiselSelection implements IInventory {
 		if (Block.getBlockFromItem(item) == null)
 			return;
 
+		if (!((IChiselItem) chisel.getItem()).canChisel(container.playerInventory.player.worldObj, this, container.playerInventory.currentItem, chisel, chiseledItem))
+			return;
+
 		ArrayList<ItemStack> list = container.carving.getItems(chiseledItem);
 
 		activeVariations = 0;

src/main/java/com/cricketcraft/chisel/item/chisel/ItemChisel.java

@@ -17,6 +17,7 @@ import com.cricketcraft.chisel.api.ChiselMode;
 import com.cricketcraft.chisel.api.IChiselItem;
 import com.cricketcraft.chisel.carving.Carving;
 import com.cricketcraft.chisel.config.Configurations;
+import com.cricketcraft.chisel.init.ChiselBlocks;
 import com.cricketcraft.chisel.utils.GeneralClient;
 
 public class ItemChisel extends Item implements IChiselItem {
@@ -82,12 +83,17 @@ public class ItemChisel extends Item implements IChiselItem {
 	public ChiselMode getChiselMode(ItemStack itemStack) {
 		return ChiselMode.SINGLE;
 	}
-	
+
 	@Override
 	public boolean canOpenGui(World world, EntityPlayer player, ItemStack chisel) {
 		return true;
 	}
 
+	@Override
+	public boolean canChisel(World world, IInventory inv, int slot, ItemStack chisel, ItemStack target) {
+		return Block.getBlockFromItem(target.getItem()) != ChiselBlocks.marble;
+	}
+
 	@Override
 	public void onChisel(World world, IInventory inv, int slot, ItemStack chisel, ItemStack target) {
 		if (Configurations.allowChiselDamage) {

src/main/java/com/cricketcraft/chisel/network/ChiselGuiHandler.java

@@ -22,7 +22,7 @@ public class ChiselGuiHandler implements IGuiHandler {
 	public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
 		switch (ID) {
 		case 0:
-			return new ContainerChisel(player.inventory, new InventoryChiselSelection(null));
+			return new ContainerChisel(player.inventory, new InventoryChiselSelection(player.getCurrentEquippedItem()));
 		case 1:
 			TileEntity tileentity = world.getTileEntity(x, y, z);
 			if (tileentity instanceof TileEntityAutoChisel)
@@ -40,7 +40,7 @@ public class ChiselGuiHandler implements IGuiHandler {
 	public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
 		switch (ID) {
 		case 0:
-			return new GuiChisel(player.inventory, new InventoryChiselSelection(null));
+			return new GuiChisel(player.inventory, new InventoryChiselSelection(player.getCurrentEquippedItem()));
 		case 1:
 			TileEntity tileentity = world.getTileEntity(x, y, z);
 			if (tileentity instanceof TileEntityAutoChisel)