Make pip-compile compatible with parse_requirements() from setuptools

[jwygoda]

What's the problem this feature will solve?

I'd like pip-compile to be compatible with parse_requirements from setuptools. It doesn't support multiple line continuations in hashes.

Describe the solution you'd like

I'd like to add a cli option to generate hashes without line continuations. Would patch with additional cli option be accepted?

Alternative Solutions

• Use sed ':a;N;$!ba;s/\\\n/ /g' requirements.txt before passing requirements to parse_requirements.
• Convince setuptools maintainers to support multiple line continuations in requirements files.

Additional context

https://github.com/pypa/setuptools/issues/2422

[atugushev]

Hello @jwygoda,

Thanks for the issue! Currently, pip-compile is compatible with pip's requirements file format (see related discussion in #1063). While I'm not sure it should support parse_requirements from setuptools also, but I'd like to see how would be resolved pypa/setuptools#2422 issue.

[jwygoda]

Hi @atugushev, Your link to the requirements file format was really helpful, thanks. I'll follow up on it in setuptools issue.