build: Add util.mkApplication

[adisbladis]

This helper takes a virtual environment and a derivation to use as a structure template & outputs a derivation without venv cruft.

See pyproject-nix/uv2nix#80
cc @jfly

[jfly]

Thanks for picking this up!

I'm not sure I'm totally grok-ing the from argument to mkApplication. Is the idea that the derivation we pass to from will have just the stuff we want (namely the [project.scripts]) we need, and so that's a convinient way to figure out what to include in the final application, rather than re-parsing a pyproject.toml file to deduce the scripts? If so, that's clever, but it does include other stuff we don't need (as you call out your post).

from might be a weird name for the parameter? project/package/application might be less weird?

[adisbladis]

it does include other stuff we don't need (as you call out your post).

And this is by design. You might want to include things that have no standardised notion in pyproject.toml such as systemd units & man pages.

from might be a weird name for the parameter? project/package/application might be less weird?

Yeah I totally agree. package feels like the best of these options:

• project is overloaded with https://pyproject-nix.github.io/pyproject.nix/lib/project.html
• package has no current distinct meaning within pyproject.nix
• application is what we're producing

[jfly]

I like this. Thanks again =)