Running black only on committed python files

Question

I am just trying to use precommit as a git hook on my python project. What I want to do is to run black only on the committed files. I am also running black through poetry.

At the moment my config looks like:

fail_fast: true
repos:
  - repo: local
    hooks:
      - id: system
        name: Black
        entry: poetry run black .
        pass_filenames: false
        language: system

This, of course, runs black on the whole project structure and this is not what I want.

Is it possible to just run black on the committed files.

Answer 1

If you are not constrained by using poetry, you can use the following that will solve your purpose:

  - repo: https://github.com/psf/black
    rev: 22.6.0
    hooks:
      - id: black
        language_version: python3.9 # Change this with your python version
        args:
          - --target-version=py39 # Change this with your python version

This will respect any and all settings you may have defined in pyproject.toml.