allow enchanting pylon items via anvil

rebar/src/main/kotlin/io/github/pylonmc/rebar/Rebar.kt

@@ -87,6 +87,7 @@ import io.github.pylonmc.rebar.recipe.RecipeType
 import io.github.pylonmc.rebar.registry.RebarRegistry
 import io.github.pylonmc.rebar.resourcepack.armor.ArmorTextureEngine
 import io.github.pylonmc.rebar.culling.BlockCullingEngine
+import io.github.pylonmc.rebar.item.base.VanillaAnvilItem
 import io.github.pylonmc.rebar.util.mergeGlobalConfig
 import io.github.pylonmc.rebar.waila.Waila
 import io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder
@@ -239,6 +240,7 @@ object Rebar : JavaPlugin(), RebarAddon {
         RebarSplashPotion.register(this, pm)
         RebarTool.register(this, pm)
         RebarWeapon.register(this, pm)
+        VanillaAnvilItem.register(this, pm)
         VanillaCookingFuel.register(this, pm)
 
         // Rebar Entities

rebar/src/main/kotlin/io/github/pylonmc/rebar/item/base/VanillaAnvilItem.kt

@@ -0,0 +1,35 @@
+package io.github.pylonmc.rebar.item.base
+
+import io.github.pylonmc.rebar.event.api.MultiListener
+import io.github.pylonmc.rebar.event.api.annotation.MultiHandler
+import io.github.pylonmc.rebar.event.api.annotation.UniversalHandler
+import io.github.pylonmc.rebar.item.RebarItem
+import io.github.pylonmc.rebar.item.RebarItemListener
+import org.bukkit.event.EventPriority
+import org.bukkit.event.inventory.PrepareAnvilEvent
+
+interface VanillaAnvilItem {
+    fun onPrepareAnvilCraft(event: PrepareAnvilEvent)
+
+    companion object : MultiListener {
+        @UniversalHandler
+        private fun onPrepareAnvil(event: PrepareAnvilEvent, priority: EventPriority) {
+            val rebarItem1 = RebarItem.fromStack(event.inventory.firstItem)
+            val rebarItem2 = RebarItem.fromStack(event.inventory.secondItem)
+            if (rebarItem1 is VanillaAnvilItem) {
+                try {
+                    MultiHandler.handleEvent(rebarItem1, "onPrepareAnvilCraft", event, priority)
+                } catch (e: Exception) {
+                    RebarItemListener.logEventHandleErr(event, e, rebarItem1)
+                }
+            }
+            if (rebarItem2 is VanillaAnvilItem) {
+                try {
+                    MultiHandler.handleEvent(rebarItem2, "onPrepareAnvil", event, priority)
+                } catch (e: Exception) {
+                    RebarItemListener.logEventHandleErr(event, e, rebarItem2)
+                }
+            }
+        }
+    }
+}

rebar/src/main/kotlin/io/github/pylonmc/rebar/recipe/RecipeListener.kt

@@ -23,6 +23,7 @@ import org.bukkit.inventory.ItemStack
 import org.bukkit.inventory.ShapedRecipe
 import org.bukkit.inventory.ShapelessRecipe
 import org.bukkit.inventory.StonecutterInventory
+import org.bukkit.inventory.meta.Damageable
 
 internal object RebarRecipeListener : Listener {
 
@@ -231,14 +232,15 @@ internal object RebarRecipeListener : Listener {
         val inventory = e.inventory
         val firstItem = inventory.firstItem
         val secondItem = inventory.secondItem
-        val firstRebarItem = RebarItem.fromStack(firstItem)
-        val secondRebarItem = RebarItem.fromStack(secondItem)
-
-        // Disallow using Rebar items but allow renaming them
-        // Have tried to support this. It's really hard because you end up effectively
-        // having to do the repair manually for items that can't usually be repaired.
-        // Gave up after 2 hours or so
-        if ((firstRebarItem != null && (secondItem != null && !secondItem.isEmpty)) || secondRebarItem != null) {
+        // Check if the result is a repaired item and if so, cancel it.
+        if(firstItem != null && e.result != null
+            && firstItem.itemMeta is Damageable && e.result!!.itemMeta is Damageable
+            && (firstItem.itemMeta as Damageable).damage < (e.result!!.itemMeta as Damageable).damage){
+            e.result = null
+            return
+        }
+        // Check if either input is a rebar item without VanillaAnvilItem and if the output is vanilla, cancel it
+        if((firstItem.isRebarAndIsNot<VanillaAnvilItem>() || secondItem.isRebarAndIsNot<VanillaAnvilItem>()) && RebarItem.fromStack(e.result) == null) {
             e.result = null
             return
         }