[IGNORE] setup precommit to play nice with bidsschema CI

[Remi-Gau]

Final splinter from #1219

This PR aims to find a pre-commit config that is compatible with the linting configuration used for the bidsschema tools and does not break anything in CI.

FYI: I am working on my main branch to be able to show the output of pre-commit CI:
for example: https://results.pre-commit.ci/run/github/150988005/1661942215.jTaSkg0fQD2c-OyJfvjqGw

Note that all the changes to files were done through running pre-commit run -a

[Remi-Gau]

Black pre-commit CI is fine:

https://results.pre-commit.ci/run/github/150988005/1661942215.jTaSkg0fQD2c-OyJfvjqGw

black....................................................................Passed

But bidsschematools CI fails:

https://github.com/bids-standard/bids-specification/runs/8111715253?check_suite_focus=true#step:5:21

Run flake8 .
./bidsschematools/validator.py:98:17: BLK100 Black would make changes.
./bidsschematools/render.py:109:13: BLK100 Black would make changes.
./bidsschematools/render.py:473:100: E501 line too long (100 > 99 characters)
./bidsschematools/schema.py:276:38: BLK100 Black would make changes.
./bidsschematools/utils.py:110:20: BLK100 Black would make changes.
./bidsschematools/tests/test_validator.py:163:12: BLK100 Black would make changes.
./bidsschematools/tests/test_make_testdata.py:39:21: BLK100 Black would make changes.
./bidsschematools/tests/test_rules.py:98:38: BLK100 Black would make changes.
./bidsschematools/tests/test_render.py:62:28: BLK100 Black would make changes.

[Remi-Gau]

flake8 pre-commit CI fails:

flake8...................................................................Failed
- hook id: flake8
- exit code: 1

tools/mkdocs_macros_bids/macros.py:5:1: F401 'bidsschematools.utils' imported but unused

This is despite .flake8 telling it to ignore F401 errors

From memory removing the utils will lead to failures of the PDF build.

[Remi-Gau]

Failure in PDF build in circle CI

Traceback (most recent call last):
  File "/root/project/pdf_build_src/process_markdowns.py", line 22, in <module>
    from mkdocs_macros_bids import macros  # noqa: F401
  File "/root/project/pdf_build_src/../tools/mkdocs_macros_bids/__init__.py", line 1, in <module>
    from macros import (
ModuleNotFoundError: No module named 'macros'

Exited with code exit status 1

https://app.circleci.com/pipelines/github/bids-standard/bids-specification/5146/workflows/7d134fa6-96ba-41a2-866f-7a23c209a764/jobs/14716?invite=true#step-104-11

[sappelhoff]

as discussed in the maintainers meeting, we could simply remove flake8-black.

One could also do a "format check" by running pre-commit in CI and complaining if there is a git diff:

pre-commit run --all-files || ( git status --short ; git diff ; exit 1 )

used here for example:

https://github.com/sappelhoff/pyprep/blob/c6b268b90e08af2d4740496414cad649344345fa/.github/workflows/python_tests.yml#L66-L70