final: prev: rec {
  nerd-fonts = let
    mkNerdFont = final.callPackage ../lib/mkNerdFont.nix {};
  in
    prev.nerd-fonts
    // {
      iosevka = mkNerdFont {
        font = iosevka;
        extraArgs = [
          "--name {/.}-NFM"
          "--use-single-width-glyphs"
        ];
      };
    };

  iosevka = prev.iosevka.override {
    set = "";

    # Guide: https://github.com/be5invis/Iosevka/blob/main/doc/custom-build.md
    privateBuildPlan = {
      family = "Iosevka";
      noLigation = true;
      serifs = "sans";
      spacing = "normal";

      variants.design = {
        ampersand = "et-tailed";
        capital-q = "crossing";
        capital-z = "straight-serifless-with-crossbar";
        cent = "open";
        dollar = "open";
        lig-double-arrow-bar = "with-notch";
        lig-equal-chain = "with-notch";
        lig-hyphen-chain = "with-notch";
        lig-plus-chain = "with-notch";
        lig-single-arrow-bar = "with-notch";
        lower-lambda = "tailed-turn";
        number-sign = "slanted";
        percent = "rings-continuous-slash-also-connected";
        seven = "straight-serifless-crossbar";
      };
      variants.italic = {
        v = "cursive-serifless";
        w = "cursive-serifless";
      };

      weights = {
        Regular.shape = 440;
        Regular.menu = 400;
        Regular.css = 400;
        Bold.shape = 680;
        Bold.menu = 700;
        Bold.css = 700;
      };

      widths = {
        Normal.shape = 500;
        Normal.menu = 5;
        Normal.css = "normal";
        Extended.shape = 600;
        Extended.menu = 7;
        Extended.css = "expanded";
      };

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