Use environment markers from setup.py install_requires

[gforcada]

What's the problem this feature will solve?

On a setup.py we have:

setup(
    ...
    install_requires=[
        'stdlib-list; python_version < "3.10"',
        ...
    ]
)

On our requirements.in we have:

-e file:.#z3c.dependencychecker[test]

But the environment marker defined on setup.py does not land in requirements.txt once we run pip-compile requirements.in:

stdlib-list==0.8.0
    # via z3c-dependencychecker

Describe the solution you'd like

Get the environment marker from setup.py land in requirements.txt

stdlib-list==0.8.0 ; python_version < "3.10"
    # via z3c-dependencychecker

Alternative Solutions

The workaround so far is to manually add stdlib-list ; python_version < "3.10" on requirements.in, which is not a big deal, but if defeats the purpose of using -e file:.#z3c.dependencychecker[test] on requirements.in

Additional context

https://peps.python.org/pep-0508/#environment-markers

Thanks for this wonderful package! ✨ ❤️ it saved plenty of work/hobby hours of mine! 🙇🏾

[atugushev]

AFAIK pip-tools don't support transitional env markers. However this pip-compile setup.py should work.