fix: arcane workbench

fixes #3

build.gradle

@@ -24,7 +24,7 @@ apply from: './gradle/scripts/mixins.gradle'
 sourceCompatibility = JavaVersion.VERSION_1_8
 targetCompatibility = JavaVersion.VERSION_1_8
 
-version = "1.7.4"
+version = "1.7.5"
 group= "dev.tilera"
 archivesBaseName = "auracore"
 

src/main/java/dev/tilera/auracore/container/ContainerWorkbench.java

@@ -27,7 +27,7 @@ public class ContainerWorkbench extends Container {
         this.tileEntity.eventHandler = this;
         this.ip = par1InventoryPlayer;
         this.addSlotToContainer((Slot)new SlotCraftingArcaneWorkbench(par1InventoryPlayer.player, this.tileEntity, this.tileEntity, 9, 124, 29));
-        this.addSlotToContainer(new SlotWorkbenchWand(this.tileEntity, 10, 124, 61));
+        this.addSlotToContainer(new SlotWorkbenchWand(this.tileEntity, 10, 124, 61, par1InventoryPlayer.player));
         for (var6 = 0; var6 < 3; ++var6) {
             for (var7 = 0; var7 < 3; ++var7) {
                 this.addSlotToContainer(new Slot(this.tileEntity, var7 + var6 * 3, 30 + var7 * 18, 17 + var6 * 18));

src/main/java/dev/tilera/auracore/container/SlotWorkbenchWand.java

@@ -1,18 +1,37 @@
 package dev.tilera.auracore.container;
 
 import dev.tilera.auracore.api.IWand;
-import net.minecraft.inventory.IInventory;
+import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.inventory.Slot;
 import net.minecraft.item.ItemStack;
+import thaumcraft.common.Thaumcraft;
 import thaumcraft.common.items.wands.ItemWandCasting;
+import thaumcraft.common.tiles.TileArcaneWorkbench;
 
 class SlotWorkbenchWand extends Slot {
-    public SlotWorkbenchWand(IInventory par2IInventory, int par3, int par4, int par5) {
+    TileArcaneWorkbench workbench;
+    EntityPlayer player;
+
+    public SlotWorkbenchWand(TileArcaneWorkbench par2IInventory, int par3, int par4, int par5, EntityPlayer player) {
         super(par2IInventory, par3, par4, par5);
+        this.workbench = par2IInventory;
+        this.player = player;
     }
 
     @Override
     public boolean isItemValid(ItemStack par1ItemStack) {
         return par1ItemStack.getItem() instanceof ItemWandCasting || par1ItemStack.getItem() instanceof IWand;
     }
+
+    @Override
+    public void onSlotChanged() {
+        super.onSlotChanged();
+        if (
+            !this.workbench.getWorldObj().isRemote && 
+            this.inventory.getStackInSlot(this.getSlotIndex()) != null &&
+            this.inventory.getStackInSlot(this.getSlotIndex()).getItem() instanceof ItemWandCasting) {
+                player.openGui(Thaumcraft.instance, 13, this.workbench.getWorldObj(), this.workbench.xCoord, this.workbench.yCoord, this.workbench.zCoord);
+            }
+    }
+
 }

src/main/java/dev/tilera/auracore/helper/Utils.java

@@ -124,6 +124,7 @@ public class Utils {
     }
 
     public static boolean spendCharge(final ItemStack itemstack, final EntityPlayer player, int amount) {
+        if (itemstack == null) return false;
         final int discount = 100 - Math.min(50, getTotalVisDiscount(player));
         amount = Math.round(amount * (discount / 100.0f));
         return ((IWand) itemstack.getItem()).consumeVis(itemstack, amount);