add recrafting option to link 2 link cards

also, clean up the net_splitter.getSides() return, it should use the
exact same index values you need to use in setSides.

added getChannel() on link cards. Link cards of the same channel are
linked in the same network. Also inventory controllers can read this as
the `linkChannel` from the item

closes #2400

src/main/scala/li/cil/oc/common/recipe/Recipes.scala

@@ -210,6 +210,7 @@ object Recipes {
       val robot = api.Items.get(Constants.BlockName.Robot)
       val switch = api.Items.get(Constants.BlockName.Switch)
       val tablet = api.Items.get(Constants.ItemName.Tablet)
+      val linkedCard = api.Items.get(Constants.ItemName.LinkedCard)
 
       // Navigation upgrade recrafting.
       GameRegistry.addRecipe(new ExtendedShapelessOreRecipe(
@@ -342,6 +343,12 @@ object Recipes {
       if (Settings.get.lootRecrafting) {
         GameRegistry.addRecipe(new LootDiskCyclingRecipe())
       }
+
+      // link card copying via crafting.
+      GameRegistry.addRecipe(new ExtendedShapelessOreRecipe(
+        linkedCard.createItemStack(2),
+        linkedCard.createItemStack(1), linkedCard.createItemStack(1)))
+
     }
     catch {
       case e: Throwable => OpenComputers.log.error("Error parsing recipes, you may not be able to craft any items from this mod!", e)

src/main/scala/li/cil/oc/common/tileentity/NetSplitter.scala

@@ -15,6 +15,7 @@ import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.util.ForgeDirection
 
 import scala.collection.convert.WrapAsJava._
+import scala.collection.mutable
 
 class NetSplitter extends traits.Environment with traits.OpenSides with traits.RedstoneAware with api.network.SidedEnvironment with DeviceInfo {
   private lazy val deviceInfo: util.Map[String, String] = Map(
@@ -112,12 +113,12 @@ class NetSplitter extends traits.Environment with traits.OpenSides with traits.R
   }
 
   // component api
-  def currentStatus(): Array[Boolean] = {
-    val openSidesCopy = Array.fill(ForgeDirection.VALID_DIRECTIONS.length)(false)
+  def currentStatus(): mutable.Map[Int, Boolean] = {
+    val openSides = mutable.Map[Int, Boolean]()
     for (side <- ForgeDirection.VALID_DIRECTIONS) {
-      openSidesCopy(side.ordinal()) = isSideOpen(side)
+      openSides += side.ordinal() -> isSideOpen(side)
     }
-    openSidesCopy
+    openSides
   }
 
   def setSide(side: ForgeDirection, state: Boolean): Boolean = {

src/main/scala/li/cil/oc/integration/opencomputers/ConverterLinkedCard.scala

@@ -0,0 +1,23 @@
+package li.cil.oc.integration.opencomputers
+
+import java.util
+
+import li.cil.oc.Constants
+import li.cil.oc.api
+import li.cil.oc.api.detail.ItemInfo
+import li.cil.oc.api.driver.Converter
+import li.cil.oc.server.component
+import net.minecraft.item.ItemStack
+
+import scala.collection.convert.WrapAsScala._
+
+object ConverterLinkedCard extends Converter {
+  lazy val linkedCard: ItemInfo = api.Items.get(Constants.ItemName.LinkedCard)
+
+  override def convert(value: scala.Any, output: util.Map[AnyRef, AnyRef]): Unit = value match {
+    case stack: ItemStack if api.Items.get(stack) == linkedCard =>
+      val card = new component.LinkedCard()
+      output += "linkChannel" -> card.tunnel
+    case _ => // Ignore.
+  }
+}

src/main/scala/li/cil/oc/integration/opencomputers/ModOpenComputers.scala

@@ -117,6 +117,7 @@ object ModOpenComputers extends ModProxy {
     MinecraftForge.EVENT_BUS.register(li.cil.oc.server.ComponentTracker)
 
     api.Driver.add(ConverterNanomachines)
+    api.Driver.add(ConverterLinkedCard)
 
     api.Driver.add(DriverAPU)
     api.Driver.add(DriverComponentBus)

src/main/scala/li/cil/oc/server/component/LinkedCard.scala

@@ -26,7 +26,7 @@ class LinkedCard extends prefab.ManagedEnvironment with QuantumNetwork.QuantumNo
     withConnector().
     create()
 
-  var tunnel = "creative"
+  var tunnel: String = "creative"
 
   // ----------------------------------------------------------------------- //
 
@@ -57,7 +57,7 @@ class LinkedCard extends prefab.ManagedEnvironment with QuantumNetwork.QuantumNo
     else result(Unit, "not enough energy")
   }
 
-  @Callback(direct = true, doc = """function():number -- Gets the maximum packet size (config setting).""")
+  @Callback(direct = true, doc = "function():number -- Gets the maximum packet size (config setting).")
   def maxPacketSize(context: Context, args: Arguments): Array[AnyRef] = result(Settings.get.maxNetworkPacketSize)
 
   def receivePacket(packet: Packet) {
@@ -65,6 +65,11 @@ class LinkedCard extends prefab.ManagedEnvironment with QuantumNetwork.QuantumNo
     node.sendToReachable("computer.signal", Seq("modem_message", packet.source, Int.box(packet.port), Double.box(distance)) ++ packet.data: _*)
   }
 
+  @Callback(direct = true, doc = "function():string -- Gets this link card's shared channel address")
+  def getChannel(context: Context, args: Arguments): Array[AnyRef] = {
+    result(this.tunnel)
+  }
+
   // ----------------------------------------------------------------------- //
 
   override def onConnect(node: Node) {