added block placer upgrade, still does not work properly in all cases

src/main/resources/assets/opencomputers/recipes/default.recipes

@@ -118,6 +118,11 @@ navigationUpgrade {
           ["oc:circuitTier3", {item=map, subID=any}, "oc:circuitTier3"]
           [ingotGold, potion, ingotGold]]
 }
+blockPlacerAirUpgrade {
+  input: [[ingotIron,  enderPearl, ingotIron]
+          ["oc:circuitTier1", pistonStickyBase, "oc:circuitTier1"]
+          [ingotIron, enderPearl, ingotIron]]
+}
 signUpgrade {
   input: [[ingotIron, dyePowder, ingotIron]
           ["oc:circuitTier1", stickWood, "oc:circuitTier1"]

src/main/scala/li/cil/oc/Items.scala

@@ -45,6 +45,7 @@ object Items {
   var upgradeNavigation: item.UpgradeNavigation = _
   var upgradeSign: item.UpgradeSign = _
   var upgradeSolarGenerator: item.UpgradeSolarGenerator = _
+  var upgradeBlockPlacerAir: item.UpgradeBlockPlacerAir = _
 
   // ----------------------------------------------------------------------- //
   // Crafting
@@ -95,6 +96,7 @@ object Items {
 
     upgradeCrafting = Recipes.addItemDelegate(new item.UpgradeCrafting(multi), "craftingUpgrade")
     upgradeGenerator = Recipes.addItemDelegate(new item.UpgradeGenerator(multi), "generatorUpgrade")
+    upgradeBlockPlacerAir = Recipes.addItemDelegate(new item.UpgradeBlockPlacerAir(multi), "blockPlacerAirUpgrade")
 
     ironNugget = new item.IronNugget(multi)
 

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

@@ -63,6 +63,7 @@ class Proxy {
     api.Driver.add(driver.item.UpgradeNavigation)
     api.Driver.add(driver.item.UpgradeSign)
     api.Driver.add(driver.item.UpgradeSolarGenerator)
+    api.Driver.add(driver.item.UpgradeBlockPlacerAir)
     api.Driver.add(driver.item.WirelessNetworkCard)
 
     if (Mods.ComputerCraft15.isAvailable) {

src/main/scala/li/cil/oc/common/item/UpgradeBlockPlacerAir.scala

@@ -0,0 +1,25 @@
+package li.cil.oc.common.item
+
+import java.util
+import net.minecraft.item.{ItemStack, EnumRarity}
+import net.minecraft.entity.player.EntityPlayer
+import li.cil.oc.Settings
+import li.cil.oc.util.Tooltip
+import net.minecraft.client.renderer.texture.IconRegister
+
+class UpgradeBlockPlacerAir(val parent: Delegator) extends Delegate {
+  val unlocalizedName = "UpgradeBlockPlacerAir"
+
+  override def rarity = EnumRarity.epic
+
+  override def tooltipLines(stack: ItemStack, player: EntityPlayer, tooltip: util.List[String], advanced: Boolean) {
+    tooltip.addAll(Tooltip.get(unlocalizedName))
+    super.tooltipLines(stack, player, tooltip, advanced)
+  }
+
+  override def registerIcons(iconRegister: IconRegister) = {
+    super.registerIcons(iconRegister)
+
+    icon = iconRegister.registerIcon(Settings.resourceDomain + ":upgrade_block_placer_air")
+  }
+}

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

@@ -0,0 +1,17 @@
+package li.cil.oc.server.component
+
+
+import net.minecraft.tileentity.TileEntity
+import li.cil.oc.api.Network
+import li.cil.oc.api.network.Visibility
+
+class UpgradeBlockPlacerAir(val owner: TileEntity) extends ManagedComponent {
+  val node = Network.newNode(this, Visibility.Network).
+    withComponent("airplacer").
+    create()
+
+  // ----------------------------------------------------------------------- //
+
+  override val canUpdate = false
+
+}

src/main/scala/li/cil/oc/server/component/robot/Robot.scala

@@ -1,12 +1,11 @@
 package li.cil.oc.server.component.robot
 
-import li.cil.oc.api
+import li.cil.oc.{Items, api, OpenComputers, Settings}
 import li.cil.oc.api.network._
 import li.cil.oc.common.tileentity
 import li.cil.oc.server.component.ManagedComponent
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
-import li.cil.oc.{OpenComputers, Settings}
 import net.minecraft.block.{BlockFluid, Block}
 import net.minecraft.entity.item.{EntityMinecart, EntityMinecartContainer, EntityItem}
 import net.minecraft.entity.{EntityLivingBase, Entity}
@@ -245,7 +244,7 @@ class Robot(val robot: tileentity.Robot) extends ManagedComponent {
         case Some(hit) if hit.typeOfHit == EnumMovingObjectType.TILE =>
           val (bx, by, bz, hx, hy, hz) = clickParamsFromHit(hit)
           player.placeBlock(robot.selectedSlot, bx, by, bz, hit.sideHit, hx, hy, hz)
-        case None if Settings.get.canPlaceInAir && player.closestEntity[Entity]().isEmpty =>
+        case None if (Items.multi.subItem(robot.getStackInSlot(3)) == Items.upgradeBlockPlacerAir) && player.closestEntity[Entity]().isEmpty =>
           val (bx, by, bz, hx, hy, hz) = clickParamsFromFacing(facing, side)
           player.placeBlock(robot.selectedSlot, bx, by, bz, side.getOpposite.ordinal, hx, hy, hz)
         case _ => false

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

@@ -0,0 +1,20 @@
+package li.cil.oc.server.driver.item
+
+import li.cil.oc.Items
+import li.cil.oc.api.driver.Slot
+import li.cil.oc.api.machine.Robot
+import li.cil.oc.server.component
+import net.minecraft.item.ItemStack
+import net.minecraft.tileentity.TileEntity
+
+object UpgradeBlockPlacerAir extends Item {
+  override def worksWith(stack: ItemStack) = isOneOf(stack, Items.upgradeBlockPlacerAir)
+
+  override def createEnvironment(stack: ItemStack, container: TileEntity) =
+    container match {
+      case robot: Robot => new component.UpgradeBlockPlacerAir(robot)
+      case _ => null
+    }
+
+  override def slot(stack: ItemStack) = Slot.Upgrade
+}