Create exception-handler.py

cogs/exception-handler.py

@@ -0,0 +1,40 @@
+from discord.ext import commands
+from discord import Interaction
+from discord.app_commands import AppCommandError
+import logging
+
+
+class ExceptionHandler(commands.Cog):
+    def __init__(self, bot: commands.Bot) -> None:
+        self.bot = bot
+
+    @commands.Cog.listener()
+    async def on_command_error(self, ctx: commands.Context, error) -> None:
+        await ctx.send(f'Hmm...do you know what this error means:\n\n{error}')
+
+    # attaching the handler when the cog is loaded
+    # and storing the old handler
+    # this is required for option 1
+    def cog_load(self):
+        tree = self.bot.tree
+        self._old_tree_error = tree.on_error
+        tree.on_error = self.on_app_command_error
+
+    # detaching the handler when the cog is unloaded
+    # this is optional for option 1
+    def cog_unload(self):
+        tree = self.bot.tree
+        tree.on_error = self._old_tree_error
+
+    # the global error handler for all app commands (slash & ctx menus)
+    async def on_app_command_error(
+            self,
+            interaction: Interaction,
+            error: AppCommandError
+    ):
+        logging.error(f'interaction: {interaction} / error: {error}')
+        await interaction.channel.send(f'Hmm...do you know what this error means:\n\n{error}')
+
+
+async def setup(bot: commands.Bot) -> None:
+    await bot.add_cog(ExceptionHandler(bot))