Add uv init --from-project <path> to import from other tools

[zanieb]

As previously discussed for uv add -r pyproject.toml but without any of the controversy about what to do with extras. We can copy all of the dependencies as reported by the build backend.

[charliermarsh]

I'll look into this tonight unless someone beats me to it.

[charliermarsh]

I have no idea why I closed this.

[charliermarsh]

Related: #6164

[blueraft]

Is this up for grabs?

[charliermarsh]

Yes!

[charliermarsh]

You can use SourceTreeResolver to get the metadata. But one challenge is... we probably need to preserve extras rather than resolving them. For example, if the user's pyproject.toml has:

[project.optional-dependencies]
foo = "bar"

Then in the project we create, we'd also want to create a foo extra with bar in it.

[blueraft]

I'll take a look soon.

we'd also want to create a foo extra with bar in it.

This makes sense, a similar PR would then resolve #6164 right?

[charliermarsh]

Yeah, it's possible that we want to skip #6164 for now since it brings up some confusing questions, like what does --extra mean in uv add --extra baz -r pyproject.toml. So let's start with support here in uv init.

[mrijken]

What is needed to get this merged/released? It will help converting a lot of users from Poetry to UV, at least for companies which have large number of repo's.

[mrcljx]

Shameless plug (in case someone stumbles over this issue here and --from-project is still WIP): I wrote a script to migrate our Poetry monorepo project to uv (keeping versions pinned). I doubt it will work immediately on other projects, but could be a good start.

https://gist.github.com/mrcljx/8e99a7f9fb924a573416f4365ee15873