update filler to use fabric transfer api

src/dev/kotlin/badasintended/slotlink/dev/SlotlinkDev.kt

@@ -6,7 +6,7 @@ import net.minecraft.util.registry.Registry
 object SlotlinkDev {
 
     fun main() {
-        Registry.register(Registry.ITEM, modId("inventory_filler"), InventoryFillerItem)
+        Registry.register(Registry.ITEM, modId("storage_filler"), StorageFillerItem)
     }
 
 }

src/dev/kotlin/badasintended/slotlink/dev/InventoryFillerItem.kt → src/dev/kotlin/badasintended/slotlink/dev/StorageFillerItem.kt

@@ -1,43 +1,43 @@
 package badasintended.slotlink.dev
 
 import badasintended.slotlink.item.ModItem
-import net.minecraft.block.InventoryProvider
-import net.minecraft.inventory.Inventory
+import kotlin.random.Random
+import kotlin.random.asJavaRandom
+import net.fabricmc.fabric.api.transfer.v1.item.ItemStorage
+import net.fabricmc.fabric.api.transfer.v1.item.ItemVariant
+import net.fabricmc.fabric.api.transfer.v1.transaction.Transaction
 import net.minecraft.item.Item
 import net.minecraft.item.ItemStack
 import net.minecraft.item.ItemUsageContext
 import net.minecraft.text.LiteralText
 import net.minecraft.util.ActionResult
+import net.minecraft.util.math.Direction
 import net.minecraft.util.registry.Registry
-import kotlin.random.Random
-import kotlin.random.asJavaRandom
 
-object InventoryFillerItem : Item(ModItem.SETTINGS) {
+object StorageFillerItem : Item(ModItem.SETTINGS) {
 
     private val random = Random.asJavaRandom()
 
     override fun hasGlint(stack: ItemStack?): Boolean {
         return true
     }
 
+    @Suppress("DEPRECATION", "UnstableApiUsage")
     override fun useOnBlock(context: ItemUsageContext): ActionResult {
         val world = context.world
         val player = context.player ?: return ActionResult.FAIL
 
         if (world.isClient) return ActionResult.SUCCESS
 
         val pos = context.blockPos
-        val state = world.getBlockState(pos)
-        val block = state.block
-
-        val inv = if (block is InventoryProvider) block.getInventory(state, world, pos) else world.getBlockEntity(pos) as? Inventory
+        val storage = ItemStorage.SIDED.find(world, pos, Direction.UP)
 
-        inv?.apply {
-            for (i in 0 until size()) {
+        if (storage != null) Transaction.openOuter().use { transaction ->
+            while (true) {
                 val item = Registry.ITEM.getRandom(random)
-                inv.setStack(i, ItemStack(item, item.maxCount))
+                if (storage.insert(ItemVariant.of(item), item.maxCount.toLong(), transaction) == 0L) break
             }
-
+            transaction.commit()
             player.sendMessage(LiteralText("Filled (${pos.x}, ${pos.y}, ${pos.z})"), true)
         }