[PATCH stable] hghave: make black version regex work with newer versions of black

[Joerg Sonnenberger]

Am Sun, May 22, 2022 at 02:13:03AM +0200 schrieb Manuel Jacob:
> # HG changeset patch
> # User Manuel Jacob <me at manueljacob.de>
> # Date 1653176900 -7200
> #      Sun May 22 01:48:20 2022 +0200
> # Branch stable
> # Node ID 29f2716c5c54c7e0f7aa6d91979893f5d2078862
> # Parent  477b5145e1a02715f846ce017b460858a58e03b1
> # EXP-Topic black_version_regex
> hghave: make black version regex work with newer versions of black
> 
> Black commit 117891878e5be4d6b771ae5de299e51b679cea27 (included in black >=
> 21.11b0) dropped the string "version " from the output of "black --version". To
> make the regex work with newer black versions, make matching of "version "
> optional.

I had a patch like this locally, but newer black versions insist on
incompatible output and that's where I stopped. There is also the issue
that the regex itself seems wrong, e.g. the unescaped "." in the [].

Joerg