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/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")
+  }
+}