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"""Utilities for loading Discord extensions."""
import importlib
import inspect
import pkgutil
import types
from typing import NoReturn
def unqualify(name: str) -> str:
"""
Return an unqualified name given a qualified module/package ``name``.
Args:
name: The module name to unqualify.
Returns:
The unqualified module name.
"""
return name.rsplit(".", maxsplit=1)[-1]
def walk_extensions(module: types.ModuleType) -> frozenset[str]:
"""
Yield extension names from the given module.
Args:
module (types.ModuleType): The module to look for extensions in.
Returns:
A set of strings that can be passed directly to :obj:`discord.ext.commands.Bot.load_extension`.
"""
def on_error(name: str) -> NoReturn:
raise ImportError(name=name) # pragma: no cover
modules = set()
for module_info in pkgutil.walk_packages(module.__path__, f"{module.__name__}.", onerror=on_error):
if unqualify(module_info.name).startswith("_"):
# Ignore module/package names starting with an underscore.
continue
if module_info.ispkg:
imported = importlib.import_module(module_info.name)
if not inspect.isfunction(getattr(imported, "setup", None)):
# If it lacks a setup function, it's not an extension.
continue
modules.add(module_info.name)
return frozenset(modules)
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