Add initial legacy configuration

nixos-modules/desktop/desktop-environment.nix

@@ -0,0 +1,81 @@
+{
+  pkgs,
+  lib,
+  ...
+}:
+let
+  mkDefault = lib.mkDefault;
+in
+{
+
+  environment.systemPackages = with pkgs; [
+    freetype
+    lxappearance
+    sound-theme-freedesktop
+
+    qt5.qtwayland # Required for qt applications
+  ];
+  environment.sessionVariables.NIXOS_OZONE_WL = "1";
+  environment.sessionVariables.DO_NOT_TRACK = "1";
+
+  programs = {
+    gnome-terminal.enable = false;
+    evolution = {
+      enable = true;
+      #plugins = [ pkgs.evolution-ews ];
+    };
+    geary.enable = false;
+    light.enable = true;
+
+    dconf.enable = true;
+
+    sway.enable = true;
+  };
+
+  services.gnome = {
+    # TODO: Do this manually and not all at once.
+    core-utilities.enable = true;
+    core-os-services.enable = false;
+
+    gnome-keyring.enable = true;
+    evolution-data-server.enable = true;
+    gnome-online-accounts.enable = true;
+    gnome-remote-desktop.enable = true;
+    sushi.enable = false;
+  };
+
+  ##########
+  # gnome.core-os-services excerpt
+
+  security.polkit.enable = true;
+  services.power-profiles-daemon.enable = false; # TODO: Remove
+
+  # Explicitly enabled since GNOME will be severely broken without these.
+  xdg.mime.enable = true;
+  xdg.icons.enable = true;
+
+  # Harmonize Qt5 application style and also make them use the portal for file chooser dialog.
+  qt = {
+    enable = mkDefault true;
+    platformTheme = mkDefault "gnome";
+    style = mkDefault "adwaita";
+  };
+
+  # Needed for themes and backgrounds
+  environment.pathsToLink = [
+    "/share" # TODO: https://github.com/NixOS/nixpkgs/issues/47173
+  ];
+
+  # GVFS
+  services.gvfs.enable = true;
+
+  # Flatpak
+  services.flatpak.enable = true;
+
+  # Portals
+  xdg.portal = {
+    enable = true;
+    wlr.enable = true;
+    extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
+  };
+}