Fix crash when opening Inserter/Redstone Emitter GUI in non-dev env

src/main/kotlin/net/shadowfacts/phycon/block/inserter/InserterBlockEntity.kt

@@ -19,6 +19,7 @@ import net.shadowfacts.phycon.init.PhyBlockEntities
 import net.shadowfacts.phycon.packet.*
 import net.shadowfacts.phycon.util.ActivationMode
 import net.shadowfacts.phycon.util.ClientConfigurableDevice
+import net.shadowfacts.phycon.util.GhostInv
 import kotlin.math.min
 
 /**
@@ -27,7 +28,8 @@ import kotlin.math.min
 class InserterBlockEntity: DeviceBlockEntity(PhyBlockEntities.INSERTER),
 	ItemStackPacketHandler,
 	ActivationController.ActivatableDevice,
-	ClientConfigurableDevice {
+	ClientConfigurableDevice,
+	GhostInv {
 
 	companion object {
 		val SLEEP_TIME = 40L
@@ -40,6 +42,9 @@ class InserterBlockEntity: DeviceBlockEntity(PhyBlockEntities.INSERTER),
 	private var inventory: ItemInsertable? = null
 	private var currentRequest: PendingExtractRequest? = null
 	var stackToExtract: ItemStack = ItemStack.EMPTY
+	override var ghostSlotStack: ItemStack
+		get() = stackToExtract
+		set(value) { stackToExtract = value }
 	var amountToExtract = 1
 	override val controller = ActivationController(SLEEP_TIME, this)
 

src/main/kotlin/net/shadowfacts/phycon/block/inserter/InserterScreenHandler.kt

@@ -37,7 +37,7 @@ class InserterScreenHandler(
 
 	init {
 		// fake slot
-		addSlot(GhostSlot(inserter::stackToExtract, 31, 20))
+		addSlot(GhostSlot(inserter, 31, 20))
 
 		// player inv
 		for (y in 0 until 3) {

src/main/kotlin/net/shadowfacts/phycon/block/redstone_emitter/RedstoneEmitterBlockEntity.kt

@@ -13,19 +13,24 @@ import net.shadowfacts.phycon.packet.DeviceRemovedPacket
 import net.shadowfacts.phycon.packet.ReadInventoryPacket
 import net.shadowfacts.phycon.packet.RequestInventoryPacket
 import net.shadowfacts.phycon.util.ClientConfigurableDevice
+import net.shadowfacts.phycon.util.GhostInv
 import kotlin.math.round
 
 /**
  * @author shadowfacts
  */
 class RedstoneEmitterBlockEntity: DeviceBlockEntity(PhyBlockEntities.REDSTONE_EMITTER),
-	ClientConfigurableDevice {
+	ClientConfigurableDevice,
+	GhostInv {
 
 	private val inventoryCache = mutableMapOf<IPAddress, GroupedItemInvView>()
 	var cachedEmittedPower: Int = 0
 		private set
 
 	var stackToMonitor: ItemStack = ItemStack.EMPTY
+	override var ghostSlotStack: ItemStack
+		get() = stackToMonitor
+		set(value) { stackToMonitor = value }
 	var maxAmount = 64
 	var mode = Mode.ANALOG
 		set(value) {

src/main/kotlin/net/shadowfacts/phycon/block/redstone_emitter/RedstoneEmitterScreenHandler.kt

@@ -36,7 +36,7 @@ class RedstoneEmitterScreenHandler(
 
 	init {
 		// fake slot
-		addSlot(GhostSlot(emitter::stackToMonitor, 31, 20))
+		addSlot(GhostSlot(emitter, 31, 20))
 
 		// player inv
 		for (y in 0 until 3) {

src/main/kotlin/net/shadowfacts/phycon/util/GhostSlot.kt

@@ -4,12 +4,11 @@ import net.minecraft.entity.player.PlayerEntity
 import net.minecraft.inventory.Inventory
 import net.minecraft.item.ItemStack
 import net.minecraft.screen.slot.Slot
-import kotlin.reflect.KMutableProperty
 
 /**
  * @author shadowfacts
  */
-class GhostSlot(prop: KMutableProperty<ItemStack>, x: Int, y: Int): Slot(GhostInv(prop), 0, x, y) {
+class GhostSlot(inv: net.shadowfacts.phycon.util.GhostInv, x: Int, y: Int): Slot(GhostInv(inv), 0, x, y) {
 
 	override fun canInsert(stack: ItemStack) = false
 
@@ -18,17 +17,17 @@ class GhostSlot(prop: KMutableProperty<ItemStack>, x: Int, y: Int): Slot(GhostIn
 
 	override fun canTakeItems(player: PlayerEntity) = false
 
-	class GhostInv(private val prop: KMutableProperty<ItemStack>): Inventory {
+	private class GhostInv(private val inv: net.shadowfacts.phycon.util.GhostInv): Inventory {
 		override fun clear() {
-			prop.setter.call(ItemStack.EMPTY)
+			inv.ghostSlotStack = ItemStack.EMPTY
 		}
 
 		override fun size() = 1
 
-		override fun isEmpty() = prop.getter.call().isEmpty
+		override fun isEmpty() = inv.ghostSlotStack.isEmpty
 
 		override fun getStack(i: Int): ItemStack {
-			return if (i == 0) prop.getter.call()
+			return if (i == 0) inv.ghostSlotStack
 			else ItemStack.EMPTY
 		}
 
@@ -43,3 +42,7 @@ class GhostSlot(prop: KMutableProperty<ItemStack>, x: Int, y: Int): Slot(GhostIn
 		override fun canPlayerUse(playerEntity: PlayerEntity?) = true
 	}
 }
+
+interface GhostInv {
+	var ghostSlotStack: ItemStack
+}