nixos-config/modules/fonts.nix

{ config, lib, pkgs, ... }:
let
  iosevka-sbruder = pkgs.iosevka.override {
    privateBuildPlan = {
      family = "Iosevka sbruder";
      spacing = "term";
      serifs = "sans";
      no-cv-ss = false;
      export-glyph-names = true;

      variants = {
        inherits = "ss20";

        design = {
          capital-g = "toothless-rounded-serifless-hooked";
          four = "closed";
          six = "closed-contour";
          nine = "closed-contour";
          number-sign = "upright-tall";
          at = "short";
          cent = "open";
          percent = "dots";
          lig-ltgteq = "slanted";
        };
      };

      weights = {
        regular = {
          shape = 400;
          menu = 400;
          css = 400;
        };
        bold = {
          shape = 700;
          menu = 700;
          css = 700;
        };
      };

      slopes = {
        upright = {
          angle = 0;
          shape = "upright";
          menu = "upright";
          css = "normal";
        };
        italic = {
          angle = 9.4;
          shape = "italic";
          menu = "italic";
          css = "italic";
        };
      };

      widths = {
        # ensures that extended won’t get built
        normal = {
          shape = 500;
          menu = 5;
          css = "normal";
        };
      };
    };

    set = "sbruder";
  };

  iosevka-sbruder-nerd-font = pkgs.runCommand "iosevka-sbruder-nerd-font" { } ''
    ${pkgs.parallel}/bin/parallel \
      ${pkgs.nerd-font-patcher}/bin/nerd-font-patcher \
        --adjust-line-height \
        --complete \
        --careful \
        --outputdir $out \
      ::: ${iosevka-sbruder}/share/fonts/truetype/*.ttf
  '';
in
lib.mkIf config.sbruder.gui.enable {
  fonts = {
    fonts = with pkgs; [
      iosevka-sbruder-nerd-font
    ] ++ lib.optionals config.sbruder.full [
      google-fonts # google font collection (free)
      lmodern # Latin Modern for non-latex applications
      noto-fonts-emoji-blob-bin # The most owo emojis (thanks google for killing them)
      source-han-sans
      source-han-serif # CJK fonts
    ] ++ lib.optionals (!config.sbruder.full) [
      roboto # default sans-serif font (normally included in google-fonts)
    ] ++ lib.optionals config.sbruder.unfree.allowAssets [
      corefonts # good ol’ microsoft fonts
      vistafonts # newer microsoft fonts
    ];

    enableDefaultFonts = true;

    fontconfig = {
      defaultFonts = {
        emoji = [ "Blobmoji" ];
        monospace = [ "IosevkaSbruder Nerd Font" "Source Han Sans" ];
        sansSerif = [ "Roboto" "Source Han Sans" ];
        serif = [ "Georgia" "Source Han Serif" ];
      };
      localConf = /* xml */ ''
        <?xml version="1.0" encoding="UTF-8"?>
        <!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
        <fontconfig>
          <alias>
            <family>system-ui</family>
            <prefer>
              <family>sans-serif</family>
            </prefer>
          </alias>
        </fontconfig>
      '';
    };
  };
}