ruff/docs/usage.md
2023-05-05 13:16:05 -04:00

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# Using Ruff
To run Ruff, try any of the following:
```shell
ruff check . # Lint all files in the current directory (and any subdirectories)
ruff check path/to/code/ # Lint all files in `/path/to/code` (and any subdirectories)
ruff check path/to/code/*.py # Lint all `.py` files in `/path/to/code`
ruff check path/to/code/to/file.py # Lint `file.py`
```
You can run Ruff in `--watch` mode to automatically re-run on-change:
```shell
ruff check path/to/code/ --watch
```
## pre-commit
Ruff can also be used as a [pre-commit](https://pre-commit.com) hook:
```yaml
- repo: https://github.com/charliermarsh/ruff-pre-commit
# Ruff version.
rev: 'v0.0.265'
hooks:
- id: ruff
```
Or, to enable autofix:
```yaml
- repo: https://github.com/charliermarsh/ruff-pre-commit
# Ruff version.
rev: 'v0.0.265'
hooks:
- id: ruff
args: [ --fix, --exit-non-zero-on-fix ]
```
Ruff's pre-commit hook should be placed after other formatting tools, such as Black and isort,
_unless_ you enable autofix, in which case, Ruff's pre-commit hook should run _before_ Black, isort,
and other formatting tools, as Ruff's autofix behavior can output code changes that require
reformatting.
## VS Code
Ruff can also be used as a [VS Code extension](https://github.com/charliermarsh/ruff-vscode) or
alongside any other editor through the [Ruff LSP](https://github.com/charliermarsh/ruff-lsp).
## GitHub Action
Ruff can also be used as a GitHub Action via [`ruff-action`](https://github.com/chartboost/ruff-action).
By default, `ruff-action` runs as a pass-fail test to ensure that a given repository doesn't contain
any lint rule violations as per its [configuration](https://github.com/charliermarsh/ruff/blob/main/docs/configuration.md).
However, under-the-hood, `ruff-action` installs and runs `ruff` directly, so it can be used to
execute any supported `ruff` command (e.g., `ruff check --fix`).
`ruff-action` supports all GitHub-hosted runners, and can be used with any published Ruff version
(i.e., any version available on [PyPI](https://pypi.org/project/ruff/)).
To use `ruff-action`, create a file (e.g., `.github/workflows/ruff.yml`) inside your repository
with:
```yaml
name: Ruff
on: [ push, pull_request ]
jobs:
ruff:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: chartboost/ruff-action@v1
```
Alternatively, you can include `ruff-action` as a step in any other workflow file:
```yaml
- uses: chartboost/ruff-action@v1
```
`ruff-action` accepts optional configuration parameters via `with:`, including:
- `version`: The Ruff version to install (default: latest).
- `options`: The command-line arguments to pass to Ruff (default: `"check"`).
- `src`: The source paths to pass to Ruff (default: `"."`).
For example, to run `ruff check --select B ./src` using Ruff version `0.0.259`:
```yaml
- uses: chartboost/ruff-action@v1
with:
src: "./src"
version: 0.0.259
args: --select B
```