Now that we have target-version = "py310" in [tool.ruff] in
pyproject.toml, ruff check complains about using typing.Optional and
typing.Union instead of newer syntax. Run the tool to fix it.
By using a TypeVar we can make mypy give proper hints for the arguments
and return type of cached functions, rather than just showing "Wrapper"
as the type.
Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
Generalise pmb.helpers.other.cache with a more python decorator.
The Cache decorator takes a list of function arguments to use as cache
keys, keyword args can be used to restrict caching so that it is skipped
entirely unless the attribute has a specific value.
For example, pmb.helpers.pmaports.get() has the decorator:
@Cache("pkgname", subpackages=True)
This means the return value will be cached only when subpackages is
True, otherwise it will always miss.
Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
