Nix Expression for FiraCode nerdfont

default.nix

{ stdenv, fetchzip }:

let
  pname = "FiraCode";
  version = "v2.0.0";
in
stdenv.mkDerivation rec {
  name = "${pname}-nerdfont-${version}";

  src = fetchzip {
    url       = "https://github.com/ryanoasis/nerd-fonts/releases/download/${version}/${pname}.zip";
    sha256    = "1bnai3k3hg6sxbb1646ahd82dm2ngraclqhdygxhh7fqqnvc3hdy";
    stripRoot = false;
  };

  buildCommand = ''
    install --target $out/share/fonts/opentype -D $src/*.otf
  '';

  meta = with stdenv.lib; {
    description = "Nerdfont version of Fira Code";
    homepage = https://github.com/ryanoasis/nerd-fonts;
    license = licenses.mit;
  };
}

This expression is now obsolete by https://github.com/NixOS/nixpkgs/blob/eb54aa1f6cc9a817bad76145894a49722cd0005b/pkgs/data/fonts/nerdfonts/default.nix#L7, where the nerd font package in nixpkgs can select a font by overriding the package

fonts.fonts = with pkgs; [
  (nerdfonts.override {
    fonts = [ 
      "FiraCode"
    ];
  })
];

I, see. Thanks for taking the time to tell me. If I could get just one more question in, what does the fonts.fonts part exactly do? It seems to be a NixOS module. So what would a non-NixOS user do instead, say if it was a dependency of a custom package.

I tried (nerdfonts.override { fonts = [ "FiraCode" ]; }) but that just gives me

error: anonymous function at /nix/store/42s3x72zmvijdjf62ng1091nnhd1ma8g-nixos-20.03.2882.51d115ac89d/nixos/pkgs/data/fonts/nerdfonts/default.nix:1:1 called with unexpected argument 'fonts'

Edit:

Ah I see, it's nerdfonts.override { withFont = "FiraCode"; }), now.

Oh god, that downloads a 2 GB file, rather than the specialized release files for the respective font!