[feature] Use by-name

[Freed-Wu]

Now nixpkgs use pkgs/by-name. Is it possible this template use it, too?

[sikmir]

Just an example: https://github.com/nagy/nur-packages/blob/master/default.nix#L4-L11

[Mic92]

Overlays are expensive evaluation wise. Is there maybe an alternative that works without creating 1 nixpkgs instead for every NUR repository?

[Mic92]

From matrix:

│122507   joerg │ So there is this step: pkgs-overlay = import by-name-overlay ./pkgs/by-name;                               
│122518   joerg │ can the result not be just passed pkgs?                                                                    
│122526   joerg │ like pkgs-overlay pkgs pkgs                                                                                
│122544   joerg │ Than it should just return the nur package set.                                                            
│122610   joerg │ Otherwise we would re-export all 80k nixpkgs pkgs in each nur repository                                   
│122626   joerg │ And one would be not able to tell what packages are actually comming from the NUR repository

[bbjubjub2494]

So I achieved this the stupid and simple way with readDir and mapAttrs.
I don't think it incurs the same cost as the overlay solution but I could be wrong.
We can also ad-hoc a "super"/"prev" argument with a let-binding.

Red-Flake/packages@7945783