81 lines
2.5 KiB
Markdown
81 lines
2.5 KiB
Markdown
# The basics
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An overview on contributing to the _Black_ project.
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## Technicalities
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Development on the latest version of Python is preferred. You can use any operating
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system.
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Install development dependencies inside a virtual environment of your choice, for
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example:
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```console
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$ python3 -m venv .venv
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$ source .venv/bin/activate
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(.venv)$ pip install -r test_requirements.txt
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(.venv)$ pip install -e .[d]
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(.venv)$ pre-commit install
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```
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Before submitting pull requests, run lints and tests with the following commands from
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the root of the black repo:
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```console
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# Linting
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(.venv)$ pre-commit run -a
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# Unit tests
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(.venv)$ tox -e py
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# Optional Fuzz testing
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(.venv)$ tox -e fuzz
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```
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### News / Changelog Requirement
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`Black` has CI that will check for an entry corresponding to your PR in `CHANGES.md`. If
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you feel this PR does not require a changelog entry please state that in a comment and a
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maintainer can add a `skip news` label to make the CI pass. Otherwise, please ensure you
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have a line in the following format:
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```md
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- `Black` is now more awesome (#X)
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```
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Note that X should be your PR number, not issue number! To workout X, please use
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[Next PR Number](https://ichard26.github.io/next-pr-number/?owner=psf&name=black). This
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is not perfect but saves a lot of release overhead as now the releaser does not need to
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go back and workout what to add to the `CHANGES.md` for each release.
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### Style Changes
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If a change would affect the advertised code style, please modify the documentation (The
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_Black_ code style) to reflect that change. Patches that fix unintended bugs in
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formatting don't need to be mentioned separately though. If the change is implemented
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with the `--preview` flag, please include the change in the future style document
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instead and write the changelog entry under a dedicated "Preview changes" heading.
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### Docs Testing
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If you make changes to docs, you can test they still build locally too.
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```console
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(.venv)$ pip install -r docs/requirements.txt
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(.venv)$ pip install [-e] .[d]
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(.venv)$ sphinx-build -a -b html -W docs/ docs/_build/
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```
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## Hygiene
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If you're fixing a bug, add a test. Run it first to confirm it fails, then fix the bug,
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run it again to confirm it's really fixed.
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If adding a new feature, add a test. In fact, always add a test. But wait, before adding
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any large feature, first open an issue for us to discuss the idea first.
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## Finally
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Thanks again for your interest in improving the project! You're taking action when most
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people decide to sit and watch.
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