Use nix for caching about stackage2nix HOT 2 CLOSED

This could be useful, but I don't think this should be implemented as a part of this project. Mixing in a state management would complicate things a lot (you know, caching and naming things). Also, stackage2nix does not duplicate build definition, I like to think of it as a function that translates Stack build definition into Nix. And I want to keep the property of idempotence when with fixed inputs we get the same output.

Also, I believe the problem of managing (fixing) inputs can be done separately using pure Nix. The only thing is missing is the ability to generate stackage packages (packages.nix and configuration-packages.nix) and package overrides (default.nix) separately. This could be done by adding a couple of configuration flags, in a much less invasive way.

What you can do now is to create such proof of concept build definition manually in Nix, as an example of stackage2nix usage. And then it would be more clear if stackage2nix can adapt something from it.

from stackage2nix.

Makes sense, and I had started thinking the same way about splitting this functionality out. I'll work on that and raise separate issues for allowing generation of stackage and project packages separately.

from stackage2nix.