Analyze extra requirements recursively

[mcarnerero]

Hi!

It could be interesting to be able of writing extra requirements based on other extra requirements. I work in a complex project containing several modules. The use of each of those modules depends on the configuration. Also, each module requires different libraries. I defined extra dependencies as follows:

[tool.poetry.extras]
mod-a = ["lib-1", "lib-2"]
mod-b = ["lib-1", "lib-3"]
mod-c = ["lib-2", "lib-4"]
collectors = ["mod-a", "mod-b"]
generators = ["mod-c"]
all = ["collectors", "generators"]

That way I could install my app with the modules related with collection executing the command:

pip install my-app[collectors]

What do you think?

[dimbleby]

duplicate #3369, #7646, #8639

[mcarnerero]

Sorry, I did not see them.