nixfiles/modules/home/base16.nix

{
  config,
  pkgs,
  lib,
  ...
}: let
  inherit (lib.types) attrsOf str enum;
  inherit (lib.modules) mkIf;
  cfg = config.base16;
in
  with lib; {
    options.base16 = {
      palette = mkOption {
        type = attrsOf str;
      };
      sass = {
        variables = mkOption {
          type = attrsOf str;
          default =
            cfg.palette
            // {
              term_font = "Iosevka";
              font = "Iosevka";
              font_size = "12px";
            };
        };
        css_style = mkOption {
          type = enum ["nested" "compressed" "compact" "expanded"];
          default = "expanded";
        };
      };
    };
    config = mkIf (cfg.schemes != {}) {
      base16 = {
        # TODO: convert to std
        palette =
          lib.mapAttrs' (k: v:
            lib.nameValuePair
            k
            "#${v.hex}")
          (lib.filterAttrs (n: _: lib.hasInfix "base" n)
            cfg.defaultScheme);
      };

      lib.kittywitch.sassTemplate = {
        name,
        src,
      }: let
        variables = pkgs.writeText "base-variables.sass" ''
          ${(concatStringsSep "\n" (mapAttrsToList (var: con: "\$${var}: ${con}") cfg.sass.variables))}
        '';
        source =
          pkgs.callPackage
          ({
            sass,
            stdenv,
          }:
            stdenv.mkDerivation {
              inherit name src variables;
              nativeBuildInputs = lib.singleton pkgs.sass;
              phases = ["buildPhase"];
              buildPhase = ''
                cat $variables $src > src-mut.sass
                sass src-mut.sass $out --sourcemap=none --trace --style=${cfg.sass.css_style}
              '';
            })
          {};
      in {
        inherit source;
        text = builtins.readFile source;
      };
      _module.args = {inherit (config.lib) kittywitch;};
    };
  }