added analyzer tool: right click on a block show its address. for computers it also shows the last error message, if any (if the computer crashed). for multi screens it always shows the address of the origin. shift-rightclick copies the address to the clipboard.

assets/opencomputers/lang/de_DE.lang

@@ -9,8 +9,8 @@ oc.block.ScreenBasic.name=Einfacher Bildschirm
 oc.block.ScreenProfessional.name=Professioneller Bildschirm
 oc.container.Computer=Computer
 oc.container.DiskDrive=Diskettenlaufwerk
+oc.item.Analyzer.name=Messgerät
 oc.item.Disk.name=Diskette
-oc.item.GraphicsCard.name=
 oc.item.GraphicsCardAdvanced.name=Hochwertige Grafikkarte
 oc.item.GraphicsCardBasic.name=Einfache Grafikkarte
 oc.item.GraphicsCardProfessional.name=Professionelle Grafikkarte

assets/opencomputers/lang/en_US.lang

@@ -9,6 +9,7 @@ oc.block.ScreenBasic.name=Basic Screen
 oc.block.ScreenProfessional.name=Professional Screen
 oc.container.Computer=Computer
 oc.container.DiskDrive=Disk Drive
+oc.item.Analyzer.name=Analyzer
 oc.item.Disk.name=Floppy Disk
 oc.item.GraphicsCardAdvanced.name=Advanced Graphics Card
 oc.item.GraphicsCardBasic.name=Basic Graphics Card

li/cil/oc/Items.scala

@@ -23,6 +23,8 @@ object Items {
   var hdd3: item.HardDiskDrive = null
   var disk: item.Disk = null
 
+  var analyzer: item.Analyzer = null
+
   def init() {
     multi = new item.Delegator(Config.itemId)
 
@@ -44,5 +46,7 @@ object Items {
 
     psu = new item.PowerSupply(multi)
     wlan = new item.WirelessNetworkCard(multi)
+
+    analyzer = new item.Analyzer(multi)
   }
 }

li/cil/oc/client/PacketHandler.scala

@@ -5,6 +5,7 @@ import li.cil.oc.common.PacketType
 import li.cil.oc.common.tileentity.{PowerDistributor, Computer, Rotatable, Screen}
 import li.cil.oc.common.{PacketHandler => CommonPacketHandler}
 import li.cil.oc.server.component.Redstone
+import net.minecraft.client.gui.GuiScreen
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.tileentity.TileEntity
 import net.minecraftforge.common.ForgeDirection
@@ -18,6 +19,7 @@ class PacketHandler extends CommonPacketHandler {
 
   override def dispatch(p: PacketParser) =
     p.packetType match {
+      case PacketType.Clipboard => onClipboard(p)
       case PacketType.ComputerStateResponse => onComputerStateResponse(p)
       case PacketType.PowerStateResponse => onPowerStateResponse(p)
       case PacketType.RedstoneStateResponse => onRedstoneStateResponse(p)
@@ -30,6 +32,11 @@ class PacketHandler extends CommonPacketHandler {
       case _ => // Invalid packet.
     }
 
+  def onClipboard(p: PacketParser) = {
+    GuiScreen.setClipboardString(p.readUTF())
+    p.player.asInstanceOf[EntityPlayer].addChatMessage("Copied to clipboard.")
+  }
+
   def onComputerStateResponse(p: PacketParser) =
     p.readTileEntity[Computer]() match {
       case Some(t) => {

li/cil/oc/common/block/Delegator.scala

@@ -2,10 +2,9 @@ package li.cil.oc.common.block
 
 import cpw.mods.fml.common.registry.GameRegistry
 import java.util
-import li.cil.oc.Config
-import li.cil.oc.CreativeTab
 import li.cil.oc.api.network.Environment
 import li.cil.oc.common.tileentity.Rotatable
+import li.cil.oc.{Items, Config, CreativeTab}
 import net.minecraft.block.Block
 import net.minecraft.block.material.Material
 import net.minecraft.client.renderer.texture.IconRegister
@@ -234,6 +233,10 @@ class Delegator[Child <: Delegate](id: Int) extends Block(id, Material.iron) {
     }
 
   override def onBlockActivated(world: World, x: Int, y: Int, z: Int, player: EntityPlayer, side: Int, hitX: Float, hitY: Float, hitZ: Float): Boolean = {
+    // Do nothing if we have an analyzer in hand.
+    if (Items.analyzer.equals(player.getCurrentEquippedItem))
+      return false
+
     // Helper method to detect items that can be used to rotate blocks, such as
     // wrenches. This structural type is compatible with the BuildCraft wrench
     // interface.

li/cil/oc/common/item/Analyzer.scala

@@ -0,0 +1,54 @@
+package li.cil.oc.common.item
+
+import cpw.mods.fml.common.network.Player
+import li.cil.oc.Config
+import li.cil.oc.api.network.Environment
+import li.cil.oc.common.tileentity
+import li.cil.oc.server.PacketSender
+import net.minecraft.client.renderer.texture.IconRegister
+import net.minecraft.entity.player.EntityPlayer
+import net.minecraft.item.ItemStack
+import net.minecraft.world.World
+
+class Analyzer(val parent: Delegator) extends Delegate {
+  val unlocalizedName = "Analyzer"
+
+  override def onItemUse(item: ItemStack, player: EntityPlayer, world: World, x: Int, y: Int, z: Int, side: Int, hitX: Float, hitY: Float, hitZ: Float) = {
+    world.getBlockTileEntity(x, y, z) match {
+      case computer: tileentity.Computer =>
+        if (!world.isRemote) {
+          computer.instance.lastError match {
+            case Some(value) => player.addChatMessage("Last error: " + value)
+            case _ =>
+          }
+          processAddress(computer, player)
+        }
+        true
+      case screen: tileentity.Screen =>
+        if (!world.isRemote) {
+          processAddress(screen.origin, player)
+        }
+        true
+      case environment: Environment =>
+        if (!world.isRemote) {
+          processAddress(environment, player)
+        }
+        true
+      case _ => super.onItemUse(item, player, world, x, y, z, side, hitX, hitY, hitZ)
+    }
+  }
+
+  private def processAddress(environment: Environment, player: EntityPlayer) {
+    val address = environment.node.address()
+    player.addChatMessage("Address: " + address)
+    if (player.isSneaking) {
+      PacketSender.sendClipboard(address, player.asInstanceOf[Player])
+    }
+  }
+
+  override def registerIcons(iconRegister: IconRegister) {
+    super.registerIcons(iconRegister)
+
+    icon = iconRegister.registerIcon(Config.resourceDomain + ":analyzer")
+  }
+}

li/cil/oc/common/item/Delegate.scala

@@ -30,4 +30,7 @@ trait Delegate {
   def onItemUse(item: ItemStack, player: EntityPlayer, world: World, x: Int, y: Int, z: Int, side: Int, hitX: Float, hitY: Float, hitZ: Float): Boolean = false
 
   def registerIcons(iconRegister: IconRegister) {}
+
+  def equals(item: ItemStack) =
+    item != null && item.itemID == parent.itemID && parent.subItem(item).exists(_.itemId == itemId)
 }

li/cil/oc/common/tileentity/Computer.scala

@@ -75,8 +75,7 @@ class Computer(isClient: Boolean) extends Rotatable with ComputerEnvironment wit
       // otherwise loose track of its screen).
       instance.update()
       if (isRunning && !node.changeBuffer(-Config.computerBaseCost)) {
-        // TODO try to print to screen? sound effect? particle effect?
-        println("not enough power, shutting down... ")
+        instance.lastError = "not enough power"
         turnOff()
       }
       if (hasChanged) {

li/cil/oc/server/PacketSender.scala

@@ -10,7 +10,15 @@ import net.minecraftforge.common.ForgeDirection
 
 /** Centralized packet dispatcher for sending updates to the client. */
 object PacketSender {
-  def sendComputerState(t: TileEntity, value: Boolean, player: Option[Player] = None) = {
+  def sendClipboard(value: String, player: Player) {
+    val pb = new PacketBuilder(PacketType.Clipboard)
+
+    pb.writeUTF(value)
+
+    pb.sendToPlayer(player)
+  }
+
+  def sendComputerState(t: TileEntity, value: Boolean, player: Option[Player] = None) {
     val pb = new PacketBuilder(PacketType.ComputerStateResponse)
 
     pb.writeTileEntity(t)
@@ -22,7 +30,7 @@ object PacketSender {
     }
   }
 
-  def sendPowerState(t: PowerDistributor, player: Option[Player] = None) = {
+  def sendPowerState(t: PowerDistributor, player: Option[Player] = None) {
     val pb = new PacketBuilder(PacketType.PowerStateResponse)
 
     pb.writeTileEntity(t)
@@ -34,7 +42,7 @@ object PacketSender {
     }
   }
 
-  def sendRedstoneState(t: TileEntity with Redstone, player: Option[Player] = None) = {
+  def sendRedstoneState(t: TileEntity with Redstone, player: Option[Player] = None) {
     val pb = new PacketBuilder(PacketType.RedstoneStateResponse)
 
     pb.writeTileEntity(t)
@@ -49,7 +57,7 @@ object PacketSender {
     }
   }
 
-  def sendRotatableState(t: Rotatable, player: Option[Player] = None) = {
+  def sendRotatableState(t: Rotatable, player: Option[Player] = None) {
     val pb = new PacketBuilder(PacketType.RotatableStateResponse)
 
     pb.writeTileEntity(t)
@@ -62,7 +70,7 @@ object PacketSender {
     }
   }
 
-  def sendScreenBufferState(t: TileEntity, w: Int, h: Int, text: String, player: Option[Player] = None) = {
+  def sendScreenBufferState(t: TileEntity, w: Int, h: Int, text: String, player: Option[Player] = None) {
     val pb = new PacketBuilder(PacketType.ScreenBufferResponse)
 
     pb.writeTileEntity(t)
@@ -76,7 +84,7 @@ object PacketSender {
     }
   }
 
-  def sendScreenCopy(t: TileEntity, col: Int, row: Int, w: Int, h: Int, tx: Int, ty: Int) = {
+  def sendScreenCopy(t: TileEntity, col: Int, row: Int, w: Int, h: Int, tx: Int, ty: Int) {
     val pb = new PacketBuilder(PacketType.ScreenCopy)
 
     pb.writeTileEntity(t)
@@ -90,7 +98,7 @@ object PacketSender {
     pb.sendToAllPlayers()
   }
 
-  def sendScreenFill(t: TileEntity, col: Int, row: Int, w: Int, h: Int, c: Char) = {
+  def sendScreenFill(t: TileEntity, col: Int, row: Int, w: Int, h: Int, c: Char) {
     val pb = new PacketBuilder(PacketType.ScreenFill)
 
     pb.writeTileEntity(t)
@@ -103,7 +111,7 @@ object PacketSender {
     pb.sendToAllPlayers()
   }
 
-  def sendScreenResolutionChange(t: TileEntity, w: Int, h: Int) = {
+  def sendScreenResolutionChange(t: TileEntity, w: Int, h: Int) {
     val pb = new PacketBuilder(PacketType.ScreenResolutionChange)
 
     pb.writeTileEntity(t)
@@ -113,7 +121,7 @@ object PacketSender {
     pb.sendToAllPlayers()
   }
 
-  def sendScreenSet(t: TileEntity, col: Int, row: Int, s: String) = {
+  def sendScreenSet(t: TileEntity, col: Int, row: Int, s: String) {
     val pb = new PacketBuilder(PacketType.ScreenSet)
 
     pb.writeTileEntity(t)

li/cil/oc/server/component/Computer.scala

@@ -77,6 +77,10 @@ class Computer(val owner: Computer.Environment) extends Persistable with Runnabl
       lua.setTotalMemory(kernelMemory + owner.installedMemory)
   })
 
+  def lastError = message
+
+  def lastError_=(value: String) = message = Option(value)
+
   // ----------------------------------------------------------------------- //
 
   def start() = state.synchronized(owner.node.network != null &&