Consider not requiring checking in generated code

[CobaltCause]

Currently, npins/default.nix is generated by npins for projects using it. I wonder if it would be possible to fetch npins itself as a library from npins/sources.json in default.nix with a small amount of code and call into the fetched library to do the work instead. flake-compat works this way, for example.

[Janik-Haag]

The npins/default.nix is already relatively small and only implements the fetching of the sources.json. What benefit would you get from special casing a npins source fetch?

[CobaltCause]

I would like this pretty much entirely for aesthetic reasons:

• Less noise in the git history
• Less chance for bugs relating to the exact format of npins/default.nix (e.g. if the format were to be changed by an autoformatter)
• It would probably make it possible to choose the name of npins/sources.json, which is currently required to be sources.json by npins/default.nix

To be clear, I don't think these things are a big deal, and I think it would be reasonable to not attempt to implement this and just close this issue.

[piegamesde]

Basically all you need is #48 and then implement the desired Nix code yourself. In theory one could provide the code as lib code on the Nixpkgs npins package, but that has an obvious bootstrapping problem