You can use _Black_ within a GitHub Actions workflow without setting your own Python
environment. Great for enforcing that your code matches the _Black_ code style.
+## Compatibility
+
+This action is known to support all GitHub-hosted runner OSes. In addition, only
+published versions of _Black_ are supported (i.e. whatever is available on PyPI).
+
+Finally, this action installs _Black_ with the `colorama` extra so the `--color` flag
+should work fine.
+
## Usage
Create a file named `.github/workflows/black.yml` inside your repository with:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- - uses: actions/setup-python@v2
- uses: psf/black@stable
```
We recommend the use of the `@stable` tag, but per version tags also exist if you prefer
-that.
+that. Note that the action's version you select is independent of the version of _Black_
+the action will use.
+
+The version of _Black_ the action will use can be configured via `version`. This can be
+any
+[valid version specifier](https://packaging.python.org/en/latest/glossary/#term-Version-Specifier)
+or just the version number if you want an exact version. The action defaults to the
+latest release available on PyPI. Only versions available from PyPI are supported, so no
+commit SHAs or branch names.
+
+You can also configure the arguments passed to _Black_ via `options` (defaults to
+`'--check --diff'`) and `src` (default is `'.'`)
+
+Here's an example configuration:
+
+```yaml
+- uses: psf/black@stable
+ with:
+ options: "--check --verbose"
+ src: "./src"
+ version: "21.5b1"
+```
-You may use `options` (Default is `'--check --diff'`) and `src` (Default is `'.'`) as
-follows:
+If you want to match versions covered by Black's
+[stability policy](labels/stability-policy), you can use the compatible release operator
+(`~=`):
```yaml
- uses: psf/black@stable
with:
options: "--check --verbose"
src: "./src"
+ version: "~= 22.0"
```