format_str() doesn't have line_length argument anymore

[daureg]

Howdy! Sorry you're having trouble. To expedite your experience,
provide some basics for me:

Operating system: Linux
Python version: 3.7
Black version: 19.3b0
Does also happen on master: probably

commit 36d3c51 removed the line_length argument of format_str() but didn't update its documentation. It's also breaking the blackcellmagic jupyter notebook extension.

[peterjc]

It wasn't just format_str() which lost the line_length argument, also format_file_contents() changed which broke my flake8 plugin:

peterjc/flake8-black#3
peterjc/flake8-black@d75a7e8

You now have to create a FileMode object, and that holds the line length (see my workaround, link above).

[ichard26]

Yeah, sorry about breaking the "public" API. We should start thinking about a documented abstract public API since Black is getting ever closer to its first stable release. Related: #779