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 = "custom";
    /*
    Guide: https://github.com/be5invis/Iosevka/blob/main/doc/custom-build.md

    Use `term` spacing to avoid dashed arrow issue
    https://github.com/ryanoasis/nerd-fonts/issues/1018
    */
    privateBuildPlan = {
      family = "Iosevka";
      noLigation = true;
      serifs = "sans";
      spacing = "term";

      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";
        };
        italic = {
          v = "cursive-serifless";
          w = "cursive-serifless";
        };
      };

      weights = {
        Bold = {
          shape = 680;
          menu = 680;
          css = 680;
        };
        Regular = {
          shape = 480;
          menu = 480;
          css = 480;
        };
      };

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

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