Make REI optional

src/main/kotlin/util/HoveredItemStack.kt

@@ -1,31 +1,27 @@
-
-
 package moe.nea.firmament.util
 
-import me.shedaniel.math.impl.PointHelper
-import me.shedaniel.rei.api.client.REIRuntime
-import me.shedaniel.rei.api.client.gui.widgets.Slot
-import me.shedaniel.rei.api.client.registry.screen.ScreenRegistry
-import net.minecraft.client.gui.Element
-import net.minecraft.client.gui.ParentElement
+import com.google.auto.service.AutoService
 import net.minecraft.client.gui.screen.ingame.HandledScreen
 import net.minecraft.item.ItemStack
 import moe.nea.firmament.mixins.accessor.AccessorHandledScreen
+import moe.nea.firmament.util.compatloader.CompatLoader
 
+interface HoveredItemStackProvider {
+	fun provideHoveredItemStack(screen: HandledScreen<*>): ItemStack?
+
+	companion object : CompatLoader<HoveredItemStackProvider>(HoveredItemStackProvider::class)
+}
+
+@AutoService(HoveredItemStackProvider::class)
+class VanillaScreenProvider : HoveredItemStackProvider {
+	override fun provideHoveredItemStack(screen: HandledScreen<*>): ItemStack? {
+		screen as AccessorHandledScreen
+		val vanillaSlot = screen.focusedSlot_Firmament?.stack
+		return vanillaSlot
+	}
+}
 
 val HandledScreen<*>.focusedItemStack: ItemStack?
-    get() {
-        this as AccessorHandledScreen
-        val vanillaSlot = this.focusedSlot_Firmament?.stack
-        if (vanillaSlot != null) return vanillaSlot
-        val focusedSlot = ScreenRegistry.getInstance().getFocusedStack(this, PointHelper.ofMouse())
-        if (focusedSlot != null) return focusedSlot.cheatsAs().value
-        var baseElement: Element? = REIRuntime.getInstance().overlay.orElse(null)
-        val mx = PointHelper.getMouseFloatingX()
-        val my = PointHelper.getMouseFloatingY()
-        while (true) {
-            if (baseElement is Slot) return baseElement.currentEntry.cheatsAs().value
-            if (baseElement !is ParentElement) return null
-            baseElement = baseElement.hoveredElement(mx, my).orElse(null)
-        }
-    }
+	get() =
+		HoveredItemStackProvider.allValidInstances
+			.firstNotNullOfOrNull { it.provideHoveredItemStack(this) }