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Update pre-commit documentation (#57)

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I got some feedback on Mastodon that it wasn't clear how to use the
linter and formatter together in pre-commit.

This also removes `--exit-non-zero-on-fix`, since pre-commit already
exits if files are changed, and changes our recommendation to always put
the formatter after the linter, since if a previous tool ends up
committing changes, pre-commit should fail anyway.
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Charlie Marsh 2023-11-07 10:33:28 -08:00 committed by GitHub
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README.md
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@ -13,67 +13,59 @@ Distributed as a standalone repository to enable installing Ruff via prebuilt wh
### Using Ruff with pre-commit
Add this to your `.pre-commit-config.yaml`:
To run Ruff's [linter](https://docs.astral.sh/ruff/linter) and [formatter](https://docs.astral.sh/ruff/formatter)
(available as of Ruff v0.0.289) via pre-commit, add the following to your `.pre-commit-config.yaml`:
```yaml
- repo: https://github.com/astral-sh/ruff-pre-commit
# Ruff version.
rev: v0.1.4
hooks:
# Run the linter.
- id: ruff
# Run the formatter.
- id: ruff-format
```
Or, to enable autofix:
To enable lint fixes, add the `--fix` argument to the lint hook:
```yaml
- repo: https://github.com/astral-sh/ruff-pre-commit
# Ruff version.
rev: v0.1.4
hooks:
# Run the linter.
- id: ruff
args: [--fix, --exit-non-zero-on-fix]
args: [ --fix ]
# Run the formatter.
- id: ruff-format
```
To run the hook on Jupyter Notebooks too:
To run the hooks over Jupyter Notebooks too, add `jupyter` to the list of allowed filetypes:
```yaml
- repo: https://github.com/astral-sh/ruff-pre-commit
# Ruff version.
rev: v0.1.4
hooks:
# Run the linter.
- id: ruff
types_or: [ python, pyi, jupyter ]
args: [ --fix ]
# Run the formatter.
- id: ruff-format
types_or: [ python, pyi, jupyter ]
```
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.
When running with `--fix`, Ruff's lint hook should be placed _before_ Ruff's formatter hook, and
_before_ Black, isort, and other formatting tools, as Ruff's fix behavior can output code changes
that require reformatting.
### Using Ruff's formatter (unstable)
When running without `--fix`, Ruff's formatter hook can be placed before or after Ruff's lint hook.
[Ruff's formatter](https://docs.astral.sh/ruff/formatter) can used with pre-commit by adding the `ruff-format` hook:
```yaml
- repo: https://github.com/astral-sh/ruff-pre-commit
# Ruff version.
rev: v0.1.4
hooks:
- id: ruff-format
```
To check formatting without changing files, use `--check`:
```yaml
- repo: https://github.com/astral-sh/ruff-pre-commit
# Ruff version.
rev: v0.1.4
hooks:
- id: ruff-format
args: [--check]
```
Note `v0.0.290` is the minimum version that provides the `ruff-format` hook.
(As long as your Ruff configuration avoids any [linter-formatter incompatibilities](https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules),
`ruff format` should never introduce new lint errors, so it's safe to run Ruff's format hook _after_
`ruff check --fix`.)
## License