formatting: introduce a `test-check-format-black.t` that enforce formatting This should prevent use to drift away from the expect format.

formatting: run black on all file again Apparently, since the blackgnarok, we divergence from the expected formatting. Formatted using:: grey.py -S $(hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**" - hgext/fsmonitor/pywatchman/** - contrib/grey.py') # skip-blame mass-reformatting only # no-check-commit reformats foo_bar functions

formatting: make black --quiet in the example `hg fix` config I do like cake, but I cannot have so many of them.

formatting: remove the data-ogre from the config example Without he final `-`, black ignore the stdin and just looks at file provided as command line argument. Since `hg fix` feeds the file content through stdin and does not pass file argument, this meant black happily exited successful (all files passed as argument were formatted) without any output. Fix picked this "no output" as the new file content, deleting all previous content. I appreciate the fact this effectively removed all buggy code in any files processing that way, but this also ate all my data. The example config is now fixed in that regards.

py3: stop normalizing .encode()/.decode() arguments to unicode Now that we don't byte transform string literals, we no longer need this transform. While we're here, we also drop some superfluous u'' prefix in existing callers. Differential Revision: https://phab.mercurial-scm.org/D7011

py3: manually import pycompat.delattr where it is needed And with this change, we no longer need the auto-inserted import statement in the source transformer, so it has been removed! Differential Revision: https://phab.mercurial-scm.org/D7010

py3: manually import getattr where it is needed The march continues. Differential Revision: https://phab.mercurial-scm.org/D7009