nichts/modules/style/theming.nix

{
  config,
  lib,
  pkgs,
  ...
}: let
  inherit (lib.modules) mkMerge mkIf;
  inherit (lib.options) mkEnableOption;
  cfg = config.modules.theming;
in {
  options.modules.theming = {
    gtk.enable = mkEnableOption "gtk theming";
    qt.enable = mkEnableOption "qt theming";
  };
  config = mkMerge [
    (mkIf cfg.gtk.enable {
      environment = {
        systemPackages = builtins.attrValues {
          inherit (pkgs) rose-pine-cursor;
        };
        etc = {
          "xdg/gtk-4.0/settings.ini".text = ''
            [Settings]
            gtk-application-prefer-dark-theme=true
            gtk-cursor-theme-name=BreezeX-RosePine-Linux
          '';

          "xdg/gtk-3.0/settings.ini".text = ''
            [Settings]
            gtk-application-prefer-dark-theme=true
            gtk-cursor-theme-name=BreezeX-RosePine-Linux
          '';

          "xdg/gtk-2.0/gtkrc".text = ''
            gtk-cursor-theme-name = "BreezeX-RosePine-Linux"
            gtk-cursor-theme-size = 30
          '';

          "xdg/Xresources".text = ''
            Xcursor.size: 30
            Xcursor.theme: BreezeX-RosePine-Linux
          '';
        };
      };
    })
  ];
}