TheaninovOS/modules/nixos/fonts/fira-code.nix

{ pkgs, lib, config, ... }:
with lib;

let cfg = config.fonts.fira-code;

in {
  options.fonts.fira-code = {
    enable = mkEnableOption "Enable the preset for Fira Code";
    stylisticSets = mkOption {
      type = types.listOf types.str;
      description = mdDoc
        "[Stylistic sets](https://github.com/tonsky/FiraCode/wiki/How-to-enable-stylistic-sets) for Fira Code";
      default =
        [ "zero" "onum" "ss04" "cv19" "cv23" "ss09" "ss06" "ss07" "ss10" ];
    };
    default = mkOption {
      type = types.bool;
      description = "Make Fira Code the default monospace font";
      default = false;
    };
  };

  config = mkIf cfg.enable {
    fonts = {
      packages = with pkgs; [ fira-code ];
      nerdfonts.additionalFonts = [ "FiraCode" ];
      fontconfig = {
        defaultFonts.monospace = mkIf cfg.default [
          (if (config.fonts.nerdfonts.enable) then
            "Fira Code Nerd Font"
          else
            "FiraCode")
        ];
        localConf = ''
          <match target="font">
            <test name="family" compare="contains">
              <string>Fira</string>
            </test>
            <edit name="fontfeatures" mode="append">
              ${
                lib.concatStringsSep " "
                (map (set: "<string>${set}</string>") cfg.stylisticSets)
              }
            </edit>
          </match>
        '';
      };
    };
  };
}