poetry 1.0.0 incompatibility change

[bdouxx]

Hi,

I want to use the last version of ansible-lint which require dev-python/rich
gentoo/gentoo#18100

There is a incompatibility change in recents versions of poetry an poetry-core
python-poetry/poetry#2212

This PR extracts the core utilities of Poetry (like the building of distributions) into a separate package (poetry-core) that is lightweight and without any declared dependency, the dependencies are vendored instead.

So some recent package like : https://github.com/willmcgugan/rich/blob/master/pyproject.toml
need

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

and not

build-backend = "poetry.masonry.api"

[mgorny]

I presume that are no real API changes, besides changed backend name?

[mgorny]

I've did a quick test but if you could do a full test, I'd appreciate that. Please let me know and then I'll make a release.

[bdouxx]

hi, with your patch, I can compile rich without problem, thank.