add asdf support to python + poetry

[iloveitaly]

Feature request

The idea here is to support asdf/.tool-versions for specifying python + poetry versions. This could then
be extended to support node, go, etc in the future but my initial use case is scoped to python.

Motivation

No response

Contribution

#1026

[github-actions]

Hello, @iloveitaly! Thanks for your submission.

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[zuchka]

@iloveitaly sorry about the delays--I'm looking into this...

[zuchka]

folks seem to like this proposal. Are you interested in finishing your PR? It looks like it's not quite done...

[zuchka]

@iloveitaly also check this out:
#1017 (comment)

maybe worth hopping on that thread? how would this PR interface with that solution?

[coffee-cup]

Hi @iloveitaly,
I think having a full on asdf provider could be a good idea. Basically if .tool-versions file is found at the root, then we install asdf and all packages defined. Would you be interested in creating a PR for this?

The problem with #1026 is that Nix does not support specifying the exact version of packages. It only supports the latest major/minor version. So parsing a tool-version file and then passing the version to Nix does not make a lot of sense in that case.

[iloveitaly]

@coffee-cup That makes sense—What do you think about just extracting the major/minor version from asdf and passing that down to the Python builder?

[coffee-cup]

That works as a good first step!