D5064: style: run black on a subset of mercurial

[durin42 (Augie Fackler)]

durin42 added a comment.


  In https://phab.mercurial-scm.org/D5064#78994, @mharbison72 wrote:
  
  > In https://phab.mercurial-scm.org/D5064#78990, @durin42 wrote:
  >
  > > Does anyone strongly object, or do we want to embrace black and the formatting changes it implies?
  >
  >
  > Is there a fix extension configuration (and I guess precommit hook- I've never used it) for this?  If so, maybe it should go on the ContributingChanges page.
  
  
  My plan was to put an `hg fix` configuration in contrib and mention it in ContributingChanges. I'd advise against a hook for this, but if someone else wanted to write one I'd at least drop it in contrib as an example...

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D5064

To: mjpieters, indygreg, durin42, #hg-reviewers
Cc: mharbison72, av6, mercurial-devel