nixos/qt: multiple fixes

{ config, lib, pkgs, ... }:

with lib;

let

  cfg = config.qt;

  isQGnome = cfg.platformTheme == "gnome" && builtins.elem cfg.style ["adwaita" "adwaita-dark"];

  isQtStyle = cfg.platformTheme == "gtk2" && !(builtins.elem cfg.style ["adwaita" "adwaita-dark"]);

  isQt5ct = cfg.platformTheme == "qt5ct";

  isLxqt = cfg.platformTheme == "lxqt";

  isKde = cfg.platformTheme == "kde";

  packages =

    if isQGnome then [

      pkgs.qgnomeplatform

      pkgs.adwaita-qt

      pkgs.qgnomeplatform-qt6

      pkgs.adwaita-qt6

    ]

    else if isQtStyle then [ pkgs.libsForQt5.qtstyleplugins pkgs.qt6Packages.qt6gtk2 ]

    else if isQt5ct then [ pkgs.libsForQt5.qt5ct pkgs.qt6Packages.qt6ct ]

    else if isLxqt then [ pkgs.lxqt.lxqt-qtplugin pkgs.lxqt.lxqt-config ]

    else if isKde then [ pkgs.libsForQt5.plasma-integration pkgs.libsForQt5.systemsettings ]

    else throw "`qt.platformTheme` ${cfg.platformTheme} and `qt.style` ${cfg.style} are not compatible.";

  platformPackages = with pkgs; {

    gnome = [ qgnomeplatform qgnomeplatform-qt6 ];

    gtk2 = [ libsForQt5.qtstyleplugins qt6Packages.qt6gtk2 ];

    kde = [ libsForQt5.plasma-integration libsForQt5.systemsettings ];

    lxqt = [ lxqt.lxqt-qtplugin lxqt.lxqt-config ];

    qt5ct = [ libsForQt5.qt5ct qt6Packages.qt6ct ];

  };

in

  stylePackages = with pkgs; {

    bb10bright = [ libsForQt5.qtstyleplugins ];

    bb10dark = [ libsForQt5.qtstyleplugins ];

    cde = [ libsForQt5.qtstyleplugins ];

    cleanlooks = [ libsForQt5.qtstyleplugins ];

    gtk2 = [ libsForQt5.qtstyleplugins qt6Packages.qt6gtk2 ];

    motif = [ libsForQt5.qtstyleplugins ];

    plastique = [ libsForQt5.qtstyleplugins ];

    adwaita = [ adwaita-qt adwaita-qt6 ];

    adwaita-dark = [ adwaita-qt adwaita-qt6 ];

    adwaita-highcontrast = [ adwaita-qt adwaita-qt6 ];

    adwaita-highcontrastinverse = [ adwaita-qt adwaita-qt6 ];

    breeze = [ libsForQt5.breeze-qt5 ];

    kvantum = [ libsForQt5.qtstyleplugin-kvantum qt6Packages.qtstyleplugin-kvantum ];

  };

in

{

  meta.maintainers = [ maintainers.romildo ];

  meta.maintainers = with lib.maintainers; [ romildo thiagokokada ];

  imports = [

    (mkRenamedOptionModule ["qt5" "enable" ] ["qt" "enable" ])

    (mkRenamedOptionModule ["qt5" "platformTheme" ] ["qt" "platformTheme" ])

    (mkRenamedOptionModule ["qt5" "style" ] ["qt" "style" ])

    (lib.mkRenamedOptionModule [ "qt5" "enable" ] [ "qt" "enable" ])

    (lib.mkRenamedOptionModule [ "qt5" "platformTheme" ] [ "qt" "platformTheme" ])

    (lib.mkRenamedOptionModule [ "qt5" "style" ] [ "qt" "style" ])

  ];

  options = {

    qt = {

      enable = lib.mkEnableOption (lib.mdDoc "Qt theming configuration");

      enable = mkEnableOption (lib.mdDoc "Qt theming configuration");

      platformTheme = mkOption {

        type = types.enum [

          "gtk2"

          "gnome"

          "lxqt"

          "qt5ct"

          "kde"

        ];

      platformTheme = lib.mkOption {

        type = with lib.types; nullOr (enum (lib.attrNames platformPackages));

        default = null;

        example = "gnome";

        relatedPackages = [

          "qgnomeplatform"

          "qgnomeplatform-qt6"

          ["libsForQt5" "qtstyleplugins"]

          [ "libsForQt5" "plasma-integration" ]

          [ "libsForQt5" "qt5ct" ]

          [ "libsForQt5" "qtstyleplugins" ]

          [ "libsForQt5" "systemsettings" ]

          [ "lxqt" "lxqt-config" ]

          [ "lxqt" "lxqt-qtplugin" ]

          ["libsForQt5" "plasma-integration"]

          [ "qt6Packages" "qt6ct" ]

          [ "qt6Packages" "qt6gtk2" ]

        ];

        description = lib.mdDoc ''

          Selects the platform theme to use for Qt applications.

          The options are

          - `gtk`: Use GTK theme with [qtstyleplugins](https://github.com/qt/qtstyleplugins)

          - `gnome`: Use GNOME theme with [qgnomeplatform](https://github.com/FedoraQt/QGnomePlatform)

          - `gtk2`: Use GTK theme with [qtstyleplugins](https://github.com/qt/qtstyleplugins)

          - `kde`: Use Qt settings from Plasma.

          - `lxqt`: Use LXQt style set using the [lxqt-config-appearance](https://github.com/lxqt/lxqt-config)

             application.

          - `qt5ct`: Use Qt style set using the [qt5ct](https://sourceforge.net/projects/qt5ct/)

             application.

          - `kde`: Use Qt settings from Plasma.

             and [qt6ct](https://github.com/trialuser02/qt6ct) applications.

        '';

      };

      style = mkOption {

        type = types.enum [

          "adwaita"

          "adwaita-dark"

          "cleanlooks"

          "gtk2"

          "motif"

          "plastique"

        ];

      style = lib.mkOption {

        type = with lib.types; nullOr (enum (lib.attrNames stylePackages));

        default = null;

        example = "adwaita";

        relatedPackages = [

          "adwaita-qt"

          "adwaita-qt6"

          [ "libsForQt5" "breeze-qt5" ]

          [ "libsForQt5" "qtstyleplugin-kvantum" ]

          [ "libsForQt5" "qtstyleplugins" ]

          [ "qt6Packages" "qt6gtk2" ]

          [ "qt6Packages" "qtstyleplugin-kvantum" ]

        ];

        description = lib.mdDoc ''

          Selects the style to use for Qt applications.

          The options are

          - `adwaita`, `adwaita-dark`: Use Adwaita Qt style with

          - `adwaita`, `adwaita-dark`, `adwaita-highcontrast`, `adawaita-highcontrastinverse`:

            Use Adwaita Qt style with

            [adwaita](https://github.com/FedoraQt/adwaita-qt)

          - `cleanlooks`, `gtk2`, `motif`, `plastique`: Use styles from

          - `breeze`: Use the Breeze style from

            [breeze](https://github.com/KDE/breeze)

          - `bb10bright`, `bb10dark`, `cleanlooks`, `gtk2`, `motif`, `plastique`:

            Use styles from

            [qtstyleplugins](https://github.com/qt/qtstyleplugins)

          - `kvantum`: Use styles from

            [kvantum](https://github.com/tsujan/Kvantum)

        '';

      };

    };

  };

  config = mkIf cfg.enable {

  config = lib.mkIf cfg.enable {

    assertions =

      let

        gnomeStyles = [

          "adwaita"

          "adwaita-dark"

          "adwaita-highcontrast"

          "adwaita-highcontrastinverse"

          "breeze"

        ];

      in

      [

        {

          assertion = cfg.platformTheme == "gnome" -> (builtins.elem cfg.style gnomeStyles);

          message = ''

            `qt.platformTheme` "gnome" must have `qt.style` set to a theme that supports both Qt and Gtk,

            for example: ${lib.concatStringsSep ", " gnomeStyles}.

          '';

        }

      ];

    environment.variables = {

      QT_QPA_PLATFORMTHEME = cfg.platformTheme;

      QT_STYLE_OVERRIDE = mkIf (! (isQt5ct || isLxqt || isKde)) cfg.style;

      QT_QPA_PLATFORMTHEME = lib.mkIf (cfg.platformTheme != null) cfg.platformTheme;

      QT_STYLE_OVERRIDE = lib.mkIf (cfg.style != null) cfg.style;

    };

    environment.profileRelativeSessionVariables = let

    environment.profileRelativeSessionVariables =

      let

        qtVersions = with pkgs; [ qt5 qt6 ];

    in {

      in

      {

        QT_PLUGIN_PATH = map (qt: "/${qt.qtbase.qtPluginPrefix}") qtVersions;

        QML2_IMPORT_PATH = map (qt: "/${qt.qtbase.qtQmlPrefix}") qtVersions;

      };

    environment.systemPackages = packages;

    environment.systemPackages =

      lib.optionals (cfg.platformTheme != null) (platformPackages.${cfg.platformTheme})

      ++ lib.optionals (cfg.style != null) (stylePackages.${cfg.style});

  };

}