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path: root/modules/system/fonts/default.nix
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{
  config,
  lib,
  pkgs,
  ...
}: let
  cfg = config.soispha.fonts;
in {
  options.soispha.fonts = {
    enable = lib.mkEnableOption "fonts";

    fonts = lib.mkOption {
      type = lib.types.listOf lib.types.str;
      example = lib.literalExpression ''["SourceCodePro" "Overpass" "FiraCode"]'';
      default = [
        "SourceCodePro"
        "Overpass"
      ];
      description = "The nerd-fonts to install";
    };

    enableEmoji = lib.mkEnableOption "emoji font support";
  };

  config = lib.mkIf cfg.enable {
    fonts = {
      packages = let
        nerdFont = pkgs.nerdfonts.override {
          inherit (cfg) fonts;
        };
      in
        [
          nerdFont
        ]
        ++ (with pkgs; [liberation_ttf])
        ++ lib.optional cfg.enableEmoji pkgs.noto-fonts-emoji;

      fontconfig = {
        # NOTE: This is responsible for color emoji support <2023-08-28>
        # WARNING: This could lead to broken font rendering, if the emoji font is used as
        # a fallback for normal characters <2024-05-16>
        localConf = lib.mkIf cfg.enableEmoji (builtins.readFile ./emoji_font.xml);

        defaultFonts = {
          serif = lib.mkForce (["Liberation Serif"] ++ lib.optional cfg.enableEmoji "Noto Color Emoji");
          sansSerif = lib.mkForce (["Overpass Nerd Font Propo"] ++ lib.optional cfg.enableEmoji "Noto Color Emoji");
          monospace = lib.mkForce (["SauceCodePro Nerd Font Mono"] ++ lib.optional cfg.enableEmoji "Noto Color Emoji");
          emoji = lib.mkIf cfg.enableEmoji (lib.mkForce ["Noto Color Emoji"]);
        };
        allowType1 = false;
        allowBitmaps = false;
      };
    };
  };
}