Implement NIX_PATH

[gytis-ivaskevicius]

This is more of a question than an issue.
@blaggacao @Pacman99 - if we were to compare master vs staging branches - currently NIX_PATH implementation does not exist there. (https://github.com/gytis-ivaskevicius/flake-utils-plus/blob/master/modules/saneFlakeDefaults.nix)

I am considering re-adding it with nixpkgs definition only. What are your guy's thoughts on it? And how should it be implemented?

Note: I'd like to avoid linking nixpkgs via environment.etc

Related: #5

[Pacman99]

I think there are some conveniences to nix path, like nix repl "<nixpkgs>", that I use. So I think it would be nice.

[blaggacao]

I have no opinion, other than I guess we agree, it should go away at some point in the future.

[gytis-ivaskevicius]

from my point of view its mostly used for nix-shell -p :D

Also, not sure if you guys noticed but there is a pretty cool nix repl implemented as part of this flake

[gytis-ivaskevicius]

Closing due to lack of interest from pretty much everybody

[noonien]

If anyone else is wondering, after setting nix.linkInputs = true;, setting nix. nixPath = [ "/etc/nix/inputs" ]; is enough to make all inputs available to nix. This makes nix-shell -p work again, even after updating.