Allow inserting tablets into disk drives to access their first internal drive.

src/main/scala/li/cil/oc/common/Proxy.scala

@@ -83,6 +83,7 @@ class Proxy {
     api.Driver.add(driver.item.Keyboard)
     api.Driver.add(driver.item.RedstoneCard)
     api.Driver.add(driver.item.Screen)
+    api.Driver.add(driver.item.Tablet)
     api.Driver.add(driver.item.UpgradeAngel)
     api.Driver.add(driver.item.UpgradeBattery)
     api.Driver.add(driver.item.UpgradeChunkloader)

src/main/scala/li/cil/oc/server/driver/item/Tablet.scala

@@ -0,0 +1,32 @@
+package li.cil.oc.server.driver.item
+
+import li.cil.oc.api.driver.{Container, Slot}
+import li.cil.oc.util.ItemUtils
+import li.cil.oc.{Settings, api}
+import net.minecraft.item.ItemStack
+import net.minecraft.nbt.NBTTagCompound
+
+object Tablet extends Item {
+  override def worksWith(stack: ItemStack) = isOneOf(stack, api.Items.get("tablet"))
+
+  override def createEnvironment(stack: ItemStack, container: Container) = {
+    val data = new ItemUtils.TabletData(stack)
+    data.items.collect {
+      case Some(fs) if FileSystem.worksWith(fs) => fs
+    }.headOption.map(FileSystem.createEnvironment(_, container)).orNull
+  }
+
+  override def slot(stack: ItemStack) = Slot.Disk
+
+  override def dataTag(stack: ItemStack) = {
+    val data = new ItemUtils.TabletData(stack)
+    val index = data.items.indexWhere {
+      case Some(fs) => FileSystem.worksWith(fs)
+      case _ => false
+    }
+    if (index >= 0 && stack.hasTagCompound && stack.getTagCompound.hasKey(Settings.namespace + "items")) {
+      stack.getTagCompound.getTagList(Settings.namespace + "items").tagAt(index).asInstanceOf[NBTTagCompound].getCompoundTag("tag")
+    }
+    else new NBTTagCompound()
+  }
+}