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import importlib
import inspect
import pkgutil
from typing import Iterator, NoReturn
from bot import exts
def unqualify(name: str) -> str:
"""Return an unqualified name given a qualified module/package `name`."""
return name.rsplit(".", maxsplit=1)[-1]
def walk_extensions() -> Iterator[str]:
"""Yield extension names from the bot.exts subpackage."""
def on_error(name: str) -> NoReturn:
raise ImportError(name=name) # pragma: no cover
for module in pkgutil.walk_packages(exts.__path__, f"{exts.__name__}.", onerror=on_error):
if unqualify(module.name).startswith("_"):
# Ignore module/package names starting with an underscore.
continue
if module.ispkg:
imported = importlib.import_module(module.name)
if not inspect.isfunction(getattr(imported, "setup", None)):
# If it lacks a setup function, it's not an extension.
continue
yield module.name
EXTENSIONS = frozenset(walk_extensions())
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