Show detailed fluid amount tooltip for Fluid Drop and Packet item (#127)

* Show detailed fluid amount tooltip for Fluid Drop and Packet item

* Guard against division by zero

src/main/java/com/glodblock/github/nei/FCStackStringifyHandler.java

@@ -0,0 +1,35 @@
+package com.glodblock.github.nei;
+
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraftforge.fluids.FluidStack;
+
+import com.glodblock.github.common.item.ItemFluidDrop;
+import com.glodblock.github.common.item.ItemFluidPacket;
+
+import codechicken.nei.api.IStackStringifyHandler;
+
+public class FCStackStringifyHandler implements IStackStringifyHandler {
+
+    @Override
+    public NBTTagCompound convertItemStackToNBT(ItemStack stack, boolean saveStackSize) {
+        return null;
+    }
+
+    @Override
+    public ItemStack convertNBTToItemStack(NBTTagCompound nbtTag) {
+        return null;
+    }
+
+    @Override
+    public FluidStack getFluid(ItemStack item) {
+        if (item.getItem() instanceof ItemFluidDrop) {
+            FluidStack fluid = ItemFluidDrop.getFluidStack(item);
+            fluid.amount /= Math.max(item.stackSize, 1);
+            return fluid;
+        } else if (item.getItem() instanceof ItemFluidPacket) {
+            return ItemFluidPacket.getFluidStack(item);
+        }
+        return null;
+    }
+}

src/main/java/com/glodblock/github/nei/NEI_FC_Config.java

@@ -8,12 +8,14 @@ import com.glodblock.github.util.ModAndClassUtil;
 import codechicken.nei.api.API;
 import codechicken.nei.api.IConfigureNEI;
 
+@SuppressWarnings("unused")
 public class NEI_FC_Config implements IConfigureNEI {
 
     @Override
     public void loadConfig() {
         API.registerNEIGuiHandler(new NEIGuiHandler());
         API.addSearchProvider(new NEIItemFilter());
+        API.registerStackStringifyHandler(new FCStackStringifyHandler());
 
         if (ModAndClassUtil.AVARITIA) {
             API.registerGuiOverlay(GuiFluidPatternWireless.class, "extreme", null);