Add generic dependency handler

src/main/kotlin/xyz/alexcrea/cuanvil/dependency/DependencyManager.kt

@@ -35,6 +35,8 @@ object DependencyManager {
     var disenchantmentCompatibility: DisenchantmentDependency? = null
     var havenBagsCompatibility: HavenBagsDependency? = null
 
+    val genericDependencies = ArrayList<GenericPluginDependency>()
+
     fun loadDependency() {
         val pluginManager = Bukkit.getPluginManager()
 
@@ -103,6 +105,7 @@ object DependencyManager {
         // Then handle plugin reload
         ecoEnchantCompatibility?.handleConfigReload()
     }
+
     // Return true if should bypass (either by a dependency or error)
     // called before immutability test
     fun earlyTryEventPreAnvilBypass(event: PrepareAnvilEvent, player: HumanEntity): Boolean {
@@ -165,6 +168,10 @@ object DependencyManager {
         // Test excellent enchantments used prepare anvil
         if (!bypass && (excellentEnchantsCompatibility?.testPrepareAnvil(event) == true)) bypass = true
 
+        for (genericDependency in genericDependencies) {
+            genericDependency.testPrepareAnvil(event)
+        }
+
         return bypass
     }
 
@@ -225,6 +232,10 @@ object DependencyManager {
         // Test if disenchantment used event click
         if (!bypass && (excellentEnchantsCompatibility?.testAnvilResult(event) == true)) bypass = true
 
+        for (genericDependency in genericDependencies) {
+            if (!bypass && genericDependency.testAnvilResult(event)) bypass = true
+        }
+
         // Test if the inventory is a gui(version specific)
         if (!bypass && (externGuiTester?.testIfGui(event.view) == true)) bypass = true
 

src/main/kotlin/xyz/alexcrea/cuanvil/dependency/plugins/ExcellentEnchantsDependency.kt

@@ -146,7 +146,7 @@ class ExcellentEnchantsDependency {
             return event.inventory.getItem(2) == null
         }
 
-        return false;
+        return false
     }
 
     private fun treatInput(item: ItemStack?): ItemStack {

src/main/kotlin/xyz/alexcrea/cuanvil/dependency/plugins/GenericPluginDependency.kt

@@ -0,0 +1,51 @@
+package xyz.alexcrea.cuanvil.dependency.plugins
+
+import org.bukkit.event.inventory.InventoryClickEvent
+import org.bukkit.event.inventory.PrepareAnvilEvent
+import org.bukkit.plugin.Plugin
+import org.bukkit.plugin.RegisteredListener
+
+abstract class GenericPluginDependency(private val plugin: Plugin) {
+
+    protected val preAnvil = ArrayList<RegisteredListener>()
+    protected val postAnvil = ArrayList<RegisteredListener>()
+
+    fun redirectListeners() {
+        // get PreAnvil and PostAnvil listeners
+        for (registeredListener in PrepareAnvilEvent.getHandlerList().registeredListeners) {
+
+            if (registeredListener.plugin != plugin) continue
+            preAnvil.add(registeredListener)
+        }
+
+        postAnvil.addAll(postAnvilEvents())
+
+        // get required PrepareAnvilEvent listener
+        for (listener in preAnvil) {
+            PrepareAnvilEvent.getHandlerList().unregister(listener)
+        }
+
+        for (listener in postAnvil) {
+            InventoryClickEvent.getHandlerList().unregister(listener)
+        }
+
+    }
+
+    protected abstract fun postAnvilEvents(): Collection<RegisteredListener>
+
+    fun testPrepareAnvil(event: PrepareAnvilEvent) {
+        for (registeredListener in preAnvil) {
+            registeredListener.callEvent(event)
+        }
+    }
+
+    fun testAnvilResult(event: InventoryClickEvent): Boolean {
+        for (registeredListener in postAnvil) {
+            registeredListener.callEvent(event)
+        }
+
+        return event.inventory.getItem(2) == null
+    }
+
+
+}