--fix-only, but for just a specific rule

[jamesbraza]

I like ANN201's autofix because it adds -> None to functions where possible. However, in general, I don't like enforcing a requirement to specify return types.

From my pyproject.toml config file:

[tool.ruff]
unsafe-fixes = true

[tool.ruff.lint]
ignore = [
    "ANN",
]
select = ["ALL"]

[tool.ruff.lint.flake8-annotations]
mypy-init-return = true

This enables the autofixes for ANN201, but also makes it a requirement to always pass.

In general, I am looking for something like --fix-only, but instead of being global, it is scoped to specific rules. Is there some way to have --fix-only for specific rule codes?

[DavidCain]

A way to work around this is to define a custom ruff.toml configuration that you use only for auto-applying ANN201:

extend = "pyproject.toml"

# This special configuration is meant to *only* autofix typing issues.
fix-only = true

[lint]
extend-safe-fixes = ["ANN201"]
select = ["ANN201"]

Then, invoking ruff check --config ruff_ann.toml will autofix ANN201 violations!