nixos-configs/modules/desktop/theme/qt.nix

self: {
  lib,
  osConfig,
  pkgs,
  ...
}: {
  config = let
    inherit (self.scopedPackages.${pkgs.system}) dracula;

    cfg = osConfig.roles.desktop;
  in {
    home.packages = [
      pkgs.libsForQt5.qtstyleplugin-kvantum
      pkgs.kdePackages.qtstyleplugin-kvantum
    ];

    qt = {
      enable = true;
      style.name = "kvantum";
      platformTheme.name = "qtct";
    };

    xdg.configFile = let
      floatFont = lib.strings.floatToString cfg.fontSize;
      qtconf =
        # ini
        ''
          [Fonts]
          fixed="Sans Serif,${floatFont},-1,5,50,0,0,0,0,0"
          general="Sans Serif,${floatFont},-1,5,50,0,0,0,0,0"

          [Appearance]
          icon_theme=Flat-Remix-Violet-Dark
          style='';
      # The newline before this must be there
    in {
      "Kvantum/Dracula/Dracula.kvconfig".source = "${dracula.gtk}/share/Kvantum/Dracula-purple-solid/Dracula-purple-solid.kvconfig";
      "Kvantum/Dracula/Dracula.svg".source = "${dracula.gtk}/share/Kvantum/Dracula-purple-solid/Dracula-purple-solid.svg";
      "Kvantum/kvantum.kvconfig".text = "[General]\ntheme=Dracula";

      "qt5ct/qt5ct.conf".text = qtconf + "kvantum";
      "qt6ct/qt6ct.conf".text = qtconf + "kvantum";
    };
  };

  # For accurate stack trace
  _file = ./qt.nix;
}