{ pkgs, ... }:
pkgs.stdenv.mkDerivation {
  name = "SAX2";

  sax2 = (pkgs.fetchurl {
    url = "https://abrudz.github.io/SAX2/SAX2.ttf";
    sha256 = "sha256-t7Se4Hkojznrret/gb1y1uVnecENTuKtQv11ygafMPY=";
  });

  patcher = (pkgs.fetchzip {
    url = "https://github.com/ryanoasis/nerd-fonts/releases/download/v3.0.2/FontPatcher.zip";
    sha256 = "sha256-ZJpF/Q5lfcW3srb2NbJk+/QEuwaFjdzboa+rl9L7GGE=";
    stripRoot = false;
  });

  dontUnpack = true;

  nativeBuildInputs = [ pkgs.fontforge (pkgs.python3.withPackages (p: [ p.fontforge ])) ];

  buildPhase = ''
    mkdir -p $out/share/fonts/truetype
    python3 -OO $patcher/font-patcher --complete --careful --custom ${pkgs.fira-code}/share/fonts/truetype/FiraCode-VF.ttf -out $out/share/fonts/truetype $sax2
  '';
}