~ is not working in mypy.ini/cache_dir

[jolaf]

I'd like to create a unified mypy cache for all my projects and store it in my home directory.

Moreover, I'd like other developers, as well as CI scripts, to do the same - storing cache in THEIR home directories on their local machines.

For that, I specify in mypy.ini:

[mypy]
cache_dir=~/.mypy_cache

But that's not working as mypy creates directory ~ in the current directory instead of creating .mypy_cache in my home directory.

I'm using mypy 0.670 from pip on Ubuntu.

[gvanrossum]

This seems a simple enough fix. Can you try your hand at sending us a PR?

[jolaf]

Unfortunately, I couldn't find the clear place in the code to easily fix this.

[jolaf]

Thank you very much!!

[weilbith]

The documentation states to support home (I guess this means ~) and environment variables. But the code only expands the ~. So instead of only calling os.path.expanduser(), I would also expect a os.path.expandvars() call. This would be really neat, since then I can use $XDG_CACHE_HOME/mypy.

[ilevkivskyi]

@weilbith What do you mean by "would be", this was already added several weeks ago https://github.com/python/mypy/blob/master/mypy/config_parser.py#L42, why are you pointing to a 5-month old code in someones fork?

[weilbith]

Okay my fault. Should researches this better. Apparently this does not work for me. ☹️ Have to checkout why not in more detail. Sry for this useless comment. 🙏

[weilbith]

Okay, just because the most recent version is from Jul 12 and this has been just implemented 15 days ago.

[ilevkivskyi]

The next release will happen soon (likely this month or early September).