Utility functions for MaybeThreadChannels implementations

Not too sure of those methods names though

Author: MayaChen350

core/src/commonMain/kotlin/entity/channel/thread/DeletedThreadChannel.kt

@@ -10,6 +10,14 @@ public class DeletedThreadChannel(
     public override val kord: Kord,
     override val supplier: EntitySupplier = kord.defaultSupplier
 ) : MaybeThreadChannel {
+    override fun <T> MaybeThreadChannel.flatMap(func: () -> T): Result<T> {
+        return Result.failure(Exception("The thread does not exists anymore."))
+    }
+
+    override fun <T> doIfStillExist(func: () -> T) {
+        return;
+    }
+
     override fun withStrategy(strategy: EntitySupplyStrategy<*>): DeletedThreadChannel {
         return DeletedThreadChannel(data, kord, strategy.supply(kord))
     }

core/src/commonMain/kotlin/entity/channel/thread/MaybeThreadChannel.kt

@@ -58,4 +58,16 @@ public sealed interface MaybeThreadChannel : Strategizable {
      * @throws [RequestException] if something went wrong during the request.
      */
     public suspend fun getParentOrNull(): ThreadParentChannel? = supplier.getChannelOfOrNull(parentId)
+
+    /**
+     * Return the value of the function in parameter if the thread is not deleted.
+     *
+     * MIGHT FAIL!
+     */
+    public fun <T> MaybeThreadChannel.flatMap(func: () -> T): Result<T>
+
+    /**
+     * Execute the function in parameter if the thread is not deleted.
+     */
+    public fun <T> doIfStillExist(func: () -> T): Unit
 }

core/src/commonMain/kotlin/entity/channel/thread/ThreadChannel.kt

@@ -131,6 +131,12 @@ public interface ThreadChannel : GuildMessageChannel, ThreadChannelBehavior, May
      */
     public val appliedTags: List<Snowflake> get() = data.appliedTags.value ?: emptyList()
 
+    override fun <T> MaybeThreadChannel.flatMap(func: () -> T): Result<T> = Result.success(func())
+
+    override fun <T> doIfStillExist(func: () -> T) {
+        func()
+    }
+
     override fun withStrategy(strategy: EntitySupplyStrategy<*>): ThreadChannel {
         return ThreadChannel(data, kord, strategy.supply(kord))
     }