Add transformers.py for app command argument transformers

snakecore/commands/__init__.py

@@ -11,6 +11,7 @@
 from .bot import *
 from .converters import *
 from .decorators import *
+from .transformers import *
 
 
 def init(global_client: discord.Client | None = None) -> None:

snakecore/commands/transformers.py

@@ -0,0 +1,34 @@
+"""This file is a part of the source code for snakecore.
+This project has been licensed under the MIT license.
+Copyright (c) 2024-present pygame-community.
+
+This file defines some transformers for application command argument parsing.
+"""
+
+import discord
+from discord import app_commands
+from discord.ext import commands
+
+_DECBotT = commands.Bot | commands.AutoShardedBot
+
+
+class MessageTransformer(app_commands.Transformer):
+    "Transforms to a :class:`discord.Message`."
+
+    async def transform(
+        self, interaction: discord.Interaction[_DECBotT], value: str
+    ) -> discord.Message:
+        try:
+            return await commands.MessageConverter().convert(
+                await commands.Context.from_interaction(interaction), value
+            )
+        except commands.BadArgument:
+            raise app_commands.TransformerError(
+                value, discord.AppCommandOptionType.string, self
+            )
+
+
+Message = app_commands.Transform[discord.Message, MessageTransformer]
+"Transforms to a :class:`discord.Message`."
+
+__all__ = ("MessageTransformer", "Message")