cosmic module

modules/de_cosmic.nix

@@ -0,0 +1,34 @@
+{
+  cosmic,
+  config,
+  lib,
+  settings,
+  ...
+}:
+with lib;
+let
+  # name = "de_cosmic";
+  # cfg = config.my_modules.${name};
+in
+{
+
+  options = {
+    my_modules.de_cosmic = {
+      enable = mkEnableOption (lib.mdDoc "Enable COSMIC desktop environment");
+    };
+  };
+
+  # Import the module from nix flake https://github.com/lilyinstarlight/nixos-cosmic
+  imports = optional settings.uses_cosmic cosmic.nixosModules.default;
+
+  config = mkIf config.my_modules.de_cosmic.enable {
+    # Use cosmic binary cache
+    nix.settings = {
+      substituters = [ "https://cosmic.cachix.org/" ];
+      trusted-public-keys = [ "cosmic.cachix.org-1:Dya9IyXD4xdBehWjrkPv6rtxpmMdRel02smYzA85dPE=" ];
+    };
+
+    services.desktopManager.cosmic.enable = true;
+    services.displayManager.cosmic-greeter.enable = true;
+  };
+}

modules/de_gnome_wayland.nix

@@ -0,0 +1,21 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib;
+let
+  name = "de_gnome_wayland";
+  cfg = config.my_modules.${name};
+in
+{
+  options = {
+    my_modules.${name} = {
+      enable = mkEnableOption (lib.mdDoc "Enable GNOME with wayland desktop environment");
+    };
+  };
+
+  config = mkIf cfg.enable {
+    # TODO
+  };
+}

modules/de_gnome_xorg.nix

@@ -0,0 +1,22 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib;
+let
+  name = "de_gnome_xorg";
+  cfg = config.my_modules.${name};
+in
+{
+  options = {
+    my_modules.${name} = {
+      enable = mkEnableOption "Enable GNOME with wayland desktop environment";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    # TODO
+  };
+}
+

modules/validations.nix

@@ -0,0 +1,22 @@
+{ lib, config, ... }:
+{
+  # config.assertions = [
+  #   {
+  #     assertion =
+  #       lib.length (
+  #         lib.filter (x: x) [
+  #           config.my_modules.de_cosmic.enable
+  #           config.my_modules.de_gnome_xorg.enable
+  #           config.my_modules.de_gnome_wayland.enable
+  #         ]
+  #       ) <= 1;
+  #     message = ''
+  #       Configuration Error: Multiple desktop environments are enabled.
+  #       Please enable only one of the following:
+  #         - my_modules.de_cosmic.enable
+  #         - my_modules.de_gnome_xorg.enable
+  #         - my_modules.de_gnome_wayland.enable
+  #     '';
+  #   }
+  # ];
+}