os/modules/graphical/default.nix

{
  lib,
  config,
  pkgs,
  ...
}:
with lib; let
  psCfg = config.pub-solar;
  cfg = config.pub-solar.graphical;
  yamlFormat = pkgs.formats.yaml {};
  recursiveMerge = attrList: let
    f = attrPath:
      zipAttrsWith (
        n: values:
          if tail values == []
          then head values
          else if all isList values
          then unique (concatLists values)
          else if all isAttrs values
          then f (attrPath ++ [n]) values
          else last values
      );
  in
    f [] attrList;
in {
  options.pub-solar.graphical = {
    enable = mkEnableOption "Life in color";
    alacritty = {
      settings = mkOption {
        type = yamlFormat.type;
        default = {};
      };
    };
    autologin.enable = mkOption {
      type = types.bool;
      default = true;
      description = "Feature flag enabling autologin after boot.";
    };
    wayland.software-renderer.enable = mkOption {
      type = types.bool;
      default = false;
      description = "Feature flag enabling wlroots software renderer, useful in VMs";
    };
  };

  config = mkIf cfg.enable {
    hardware.opengl.enable = true;
    environment = {
      systemPackages = with pkgs; [
        gtk-engine-murrine
        gtk_engines
        gsettings-desktop-schemas

        matcha-gtk-theme
        papirus-maia-icon-theme

        glib
      ];
      etc = {
        "xdg/PubSolar.conf".text = ''
          [Qt]
          style=GTK+
        '';
      };
    };

    services.getty.autologinUser = mkIf cfg.autologin.enable (mkForce "${psCfg.user.name}");

    qt = {
      enable = true;
      platformTheme = "gtk2";
      style = "gtk2";
    };

    # Required for running Gnome apps outside the Gnome DE, see https://nixos.wiki/wiki/GNOME#Running_GNOME_programs_outside_of_GNOME
    programs.dconf.enable = true;
    services.udev.packages = with pkgs; [gnome3.gnome-settings-daemon];
    # Enable Sushi, a quick previewer for nautilus
    services.gnome.sushi.enable = true;
    # Enable GVfs, a userspace virtual filesystem
    services.gvfs.enable = true;

    fonts.enableDefaultPackages = true;
    fonts.packages = with pkgs; [
      fira-code
      fira-code-symbols
      google-fonts
      lato
      montserrat
      nerdfonts
      noto-fonts
      noto-fonts-cjk
      open-sans
      powerline-fonts
      source-sans-pro
    ];

    home-manager = with pkgs;
      setAttrByPath ["users" psCfg.user.name] {
        home.packages = [
          alacritty
          foot
          ungoogled-chromium
          firefox-wayland

          flameshot
          libnotify
          gnome.adwaita-icon-theme
          gnome.eog
          gnome.nautilus
          gnome.yelp
          hicolor-icon-theme
          toggle-kbd-layout
        ];

        xdg.configFile."alacritty/alacritty.yml" = {
          source = yamlFormat.generate "alacritty.yml" (recursiveMerge [(import ./alacritty.nix) cfg.alacritty.settings]);
        };

        gtk = {
          enable = true;
          font.name = "Lato";
          iconTheme = {
            package = pkgs.papirus-icon-theme;
            name = "Papirus-Adapta-Nokto-Maia";
          };
          theme = {
            package = pkgs.matcha-gtk-theme;
            name = "Matcha-dark-aliz";
          };

          gtk3.extraConfig = {
            gtk-xft-antialias = "1";
            gtk-xft-hinting = "1";
            gtk-xft-hintstyle = "hintfull";
            gtk-xft-rgba = "rgb";
            gtk-application-prefer-dark-theme = "true";
          };
        };

        # Fix KeepassXC rendering issue
        # https://github.com/void-linux/void-packages/issues/23517
        systemd.user.sessionVariables.QT_AUTO_SCREEN_SCALE_FACTOR = "0";

        xresources.extraConfig = builtins.readFile ./.Xdefaults;

        systemd.user.services.network-manager-applet = import ./network-manager-applet.service.nix pkgs;
      };
  };
}