change only what was changed

pipenv install git+https://github.com/luxresearch/yapf-diff.git@master#egg=yapf-diff 

pip install git+https://github.com/luxresearch/yapf-diff.git@master#egg=yapf-diff 

# requirements.txt: for a fast download https://github.com/luxresearch/yapf-diff/archive/master.tar.gz 

Only if formatting all the lines in your modified file(s) would cause an unacceptably big diff in your revision history. PEP 8 recommends keeping your code consistent with the surrounding code. yapf-diff guarantees consistency only within the lines touched within a diff.

• if you're the the one choosing how and when to lint, choose black for consistency and speed.
• if formatting entire file at a time is an option, use something like

git diff --name-only | xargs black # or yapf, if you need a custom format

# usage: yapf-diff [-h] [-d] [--debug] [-i] [--from-git-diff [BASE_REF]] # # format only changed lines # # optional arguments: # -h, --help show this help message and exit # -d, --diff print the yapf args and produced diff # --debug print the style yapf is picking up # -i, --in-place modify the changed files # --from-git-diff [BASE_REF] # if used as a flag, this indicates that stdin is from # git diff. If used as an argument, it indicates a ref # against which to call git diff # examples: git diff origin/master | python -m yapf-diff --diff python -m yapf-diff --from-git-diff="$(git log --merges -n 1)" --diff

This module modifies a function from pycodestyle, which is under an MIT license. Their license is included within ./src/lib.py. Thanks to the PyCQA team for doing a much better job at unified diff parsing than my initial implementation.

See also:

• https://github.com/hayd/pep8radius
• https://gist.github.com/mwek/59aefeefc812dea39c93c068eb30b491