add the AbstractCommandErrorHandler interface

this represents an interface that all command handlers will need to implement in order to be able to use them in both app & text command errors

Author: shtlrs

pydis_core/utils/error_handling/commands/__init__.py

@@ -0,0 +1,3 @@
+from .abc import AbstractCommandErrorHandler
+
+__all__ = ["AbstractCommandErrorHandler"]

pydis_core/utils/error_handling/commands/abc.py

@@ -0,0 +1,24 @@
+from abc import ABC, abstractmethod
+from typing import NoReturn
+
+from discord import Interaction
+from discord.ext.commands import Context
+
+
+class AbstractCommandErrorHandler(ABC):
+    """An abstract command error handler."""
+
+    @abstractmethod
+    async def should_handle_error(self, error: Exception) -> bool:
+        """A predicate that determines whether the error should be handled."""
+        raise NotImplementedError
+
+    @abstractmethod
+    async def handle_app_command_error(self, interaction: Interaction, error: Exception) -> NoReturn:
+        """Handle error raised in the context of app commands."""
+        raise NotImplementedError
+
+    @abstractmethod
+    async def handle_text_command_error(self, context: Context, error: Exception) -> NoReturn:
+        """Handle error raised in the context of text commands."""
+        raise NotImplementedError