How to disable line-length formatter rule for a specific file?

[lypwig]

I have one file in my code base containing long lines that I want to keep as is.

I added # ruff: noqa: E501 at the top to disable warnings about long lines, but the formatter still splits the line.

Also maybe the line-length formatter rule should be disabled when E501 is disabled.

[ntBre]

Hmm, I don't think the formatter has any mechanism for setting configuration options on a per-file basis like the linter's per-file-ignores, for example. If the file is in a separate directory, you could use a ruff.toml file in that directory that would apply to any files in the same directory. Otherwise, I think the only options are to exclude the file from formatting or to use suppression comments around the lines you want to allow to be longer.

[lypwig]

Ok thank you. I will use fmt: skip in my case.
Does it make sense for you to disable line-length formatter rule when E501 is disabled?

[ntBre]

Does it make sense for you to disable line-length formatter rule when E501 is disabled?

I don't think this would make sense because the formatter and linter are actually quite separate, and the formatter doesn't know about lint rules or their suppression comments. I also don't think it's actually possible to disable the formatter's line length setting, you can only set it to a maximum value of 320. The formatter isn't structured as a collection of isolated rules like the linter.