Is there a way to enable

ruff

only for certain targets (in BUILD files)?

is this what you're looking for? https://www.pantsbuild.org/stable/reference/targets/python_sources#skip_ruff

More-so the opposite--leave

black

the default but conditionally use

ruff

for certain projects]

Oops, misunderstood. The ruff configuration discovery seems to work pretty well with pants: https://docs.astral.sh/ruff/configuration/#config-file-discovery So you could have ruff enabled globally with no global rules, and then have a ruff.toml that enables rules certain packages. You can use “extends” to pull in a common config even. Would that help in your case?

hmm yeah that might work--i'll see if i can get that working