From: Perry Vargas <perrybvargas@gmail.com>
Date: Sat, 22 Jan 2022 06:00:33 +0000 (-0800)
Subject: Allow setting custom cache directory on all platforms (#2739)
X-Git-Url: https://git.madduck.net/etc/vim.git/commitdiff_plain/10677baa40f818ca06c6a9d5efa0dca052865bfb?ds=sidebyside;hp=10677baa40f818ca06c6a9d5efa0dca052865bfb

Allow setting custom cache directory on all platforms (#2739)

Fixes #2506

``XDG_CACHE_HOME`` does not work on Windows. To allow for users to set a custom cache directory on all systems I added a new environment variable ``BLACK_CACHE_DIR`` to set the cache directory. The default remains the same so users will only notice a change if that environment variable is set.

The specific use case I have for this is I need to run black on in different processes at the same time. There is a race condition with the cache pickle file that made this rather difficult. A custom cache directory will remove the race condition.

I created ``get_cache_dir`` function in order to test the logic. This is only used to set the ``CACHE_DIR`` constant.
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