Support dependency groups from poetry

[joshbrooks]

What's the problem this feature will solve?

Is it possible to support Poetry groups via --extra? It seems that they are not (yet) supported

Poetry supports both "extras" and "dependency groups". pip-compile supports "extras" but (afaik) does not support "dependency groups".

Poetry encourages the use of "dependency groups" for e.g. dev requirements.

Describe the solution you'd like

Poetry encourages the use of a "dev" group for dependencies. From the Poetry docs

you might have dependencies that are only needed to test your project or to build the documentation.

Further, poetry encourages dev dependencies to be put into a group:

$ poetry add --dev black
The --dev option is deprecated, use the `--group dev` notation instead.

An an example, if I include isort in "extras" via pip-compile -v --extra dev -o dev-requirements.txt pyproject.toml isort will be included in requirements

[tool.poetry.dependencies]
python = "^3.7"
isort = "^5.9.3"

[tool.poetry.extras]
dev = [
  "isort",
]

However when I use the dev group it will not be inlcuded

[tool.poetry.dependencies]
python = "^3.7"

[tool.poetry.group.dev.dependencies]
isort = "^5.10.1"

Alternative Solutions

As a workaround, I can use extra with a list of dev dependencies.

Additional context

[q0w]

Currently not, because it seems pip-tools builds wheels to get metadata['Provides-Extra'], and poetry group dependencies are not exposable to wheel metadata. So to do it, pip-tools needs to manually parse pyproject

[RonnyPfannschmidt]

As this is a poetry extension, I believe it's fair not to support it until a pep is accepted

[merwok]

Some discussion here: https://discuss.python.org/t/adding-a-non-metadata-installer-only-dev-dependencies-table-to-pyproject-toml/20106