refactor into modules

nixos/modules/desktop/fonts.nix

@@ -0,0 +1,10 @@
+{ pkgs, ... }:
+
+{
+  fonts.packages = with pkgs; [
+    noto-fonts
+    noto-fonts-cjk-sans
+    noto-fonts-color-emoji
+    nerd-fonts.fira-code
+  ];
+}

nixos/modules/desktop/greetd.nix

@@ -0,0 +1,13 @@
+{ pkgs, ... }:
+
+{
+  services.greetd = {
+    enable = true;
+    settings = {
+      default_session = {
+        command = "${pkgs.tuigreet}/bin/tuigreet --time --cmd niri-session";
+        user = "greeter";
+      };
+    };
+  };
+}

nixos/modules/desktop/xdg.nix

@@ -0,0 +1,22 @@
+{ pkgs, ... }:
+
+{
+  security.polkit.enable = true;
+  services.gnome.gnome-keyring.enable = true;
+  programs.dconf.enable = true;
+
+  xdg.portal = {
+    enable = true;
+    extraPortals = [
+      pkgs.xdg-desktop-portal-gtk
+      pkgs.xdg-desktop-portal-gnome
+    ];
+    config = {
+      common = {
+        default = [ "gtk" ];
+        "org.freedesktop.impl.portal.ScreenCast" = [ "gnome" ];
+        "org.freedesktop.impl.portal.Screenshot" = [ "gnome" ];
+      };
+    };
+  };
+}

nixos/modules/desktop/xwayland.nix

@@ -0,0 +1,9 @@
+{ ... }:
+
+{
+  programs.xwayland.enable = true;
+
+  environment.sessionVariables = {
+    QT_QPA_PLATFORMTHEME = "qt5ct";
+  };
+}