Use src-layout instead of flat-layout

[chrysle]

Any reason why this project doesn't adhere to src-layout? One should still be able to invoke pip-tools through runpy afterwards.

[webknjaz]

Probably historic state of things. It doesn't matter, really. And I don't see any reason to change it.

[chrysle]

Hmm, it would help to prevent any accidental importing of the code when it should be installed (also when developing, for that we have tox devenv). Besides, I found this line, it seems to have been intended:

pip-tools/pyproject.toml

Line 118 in 347fec5

# needed only because we did not adopt src layout yet

[macro1]

I wonder if that comment is wrong.. Explicitly setting includes is needed due to the distribution package name not matching the import package name isn't it?

edit: I see. src-layout is supported directly by "Automatic discovery" in setuptools. Interesting.
https://setuptools.pypa.io/en/latest/userguide/package_discovery.html#auto-discovery

[chrysle]

I wonder if that comment is wrong..

I don't think custom discovery is needed, anyway, as setuptools will also try its best at detecting packages with flat-layout, and we don't have any that we would want to exclude.