mypy: fix "unused type ignore" issue on windows

[radoering]

At the moment the mypy pre-commit hooks fails on windows with:

src\poetry\utils\appdirs.py:211: error: Unused "type: ignore" comment

[dimbleby]

poetry.utils._compat has WINDOWS = sys.platform == "win32". With that in mind I am pretty suspicious about whether the more elaborate definition in this file is actually useful.

It looks as though sys.platform == "cli" was a thing IronPython did, but not since IronLanguages/ironpython3#395, which seems to have gone into their version 3.4.0 - so that surely is not something we need to worry about any more.

Therefore suggest it would be cleaner to change all of the if WINDOWS in this file to if sys.platform == "win32", and also put everything from the definition of _get_win_folder_from_registry() downwards inside an if sys.platform == "win32" block? That would satisfy mypy I think.

[branchvincent]

it would be cleaner to change all of the if WINDOWS in this file to if sys.platform == "win32"

agreed, this code originated from appdirs, which has been superseded by platformdirs which does exactly that

https://github.com/platformdirs/platformdirs/blob/60fc40c294d90f7687f779487b8c19679fb73255/src/platformdirs/__init__.py#L20-L21

[dimbleby]

platformdirs is already in poetry's dependency tree (via virtualenv), perhaps it would be better just to use that directly, rather than maintaining an old copy of it

[radoering]

You are probably right but that requires further investigation. The docstring says "modified to suit our purposes". I suppose we should check what modifications were made and if these are obsolete when using platformdirs.

For now, I'm satisfied with fixing mypy but feel free to check if platformdirs can be used safely and draft a PR.

[dimbleby]

#5527

per comment in that MR, this does change the behaviour on MacOS, in a way that seems to be a straight bug fix. I look forward to learning whether poetry feels able to take such things.

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