Perhaps it is just me. But after so many attempts of trying to getting started with Nix, it is still not clear to me how to *author* Nix packages. My mental model about Nix is that it resembles make, but for the whole dependency graph. I kind of hoped that the Nix language is more sane. I think there is a project of similar goals but the script is in Python? I remember finding it once, but couldn't recall its name.