Hi, I have problems setting up the experimental ruff linter. It seems to work but my config gets ignored. I have a the following setup: pyproject.toml

[tool.ruff]
cache_dir = ".cache_and_logs/.ruff"
line-length=40
select = ["E", "F", "B", "Q"]

pants.toml:

[ruff]
lockfile = "lockfiles/ruff.lock"

The line-length limit is set to 40, but when running pants fmt or fix ruff does not throw an error or changes anything. My python file contains a long list in one line (>120 chars)

You're not setting a fixable list, perhaps try that since fmt and fix both imply / need mutation.

So changing

cache_dir

to

cache-dir

changed something. Now ruff seems to make changes e.g. sorting imports. When running pants lint how can I get an output of what needs to be changed?

The

fmt

and

fix

goals fix things; so no output needed, although there may be some, I'm not familiar with either ruff or our integration with it. The

lint

goal does not fix things; so it can only resort to printing issues. Have you run that?

When did the ruff linter become public?

For ruff specifically, there’s a bug with the lint goal (not with fix, though): https://github.com/pantsbuild/pants/issues/18430 Might that be affecting you?

Thanks for you answers. @broad-processor-92400 yes this is affecting me. But even when I have a fixable error when I run

fmt

it fails correctly but I get no output of whats wrong. How can I get an output of what needs to be changed?