chore: refactor system modules

system/desktop/default.nix

@@ -0,0 +1,3 @@
+{
+  imports = [./hyprland.nix ./niri.nix ./xserver.nix];
+}

system/desktop/hyprland.nix

@@ -0,0 +1,14 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.system.desktop.hyprland;
+in {
+  options.system.desktop.hyprland.enable = mkEnableOption "Enables Hyprland";
+  config.programs.hyprland = mkIf cfg.enable {
+    inherit (cfg) enable;
+    withUWSM = true;
+  };
+}

system/desktop/niri.nix

@@ -0,0 +1,13 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.system.desktop.niri;
+in {
+  options.system.desktop.niri.enable = mkEnableOption "Enables Niri";
+  config.programs.niri = mkIf cfg.enable {
+    inherit (cfg) enable;
+  };
+}

system/desktop/xserver.nix

@@ -0,0 +1,45 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.system.desktop.xserver;
+in {
+  options.system.desktop.xserver = {
+    enable = mkEnableOption "Enables xserver";
+    de = mkOption {
+      type = types.enum ["gnome" "kde"];
+      default = "gnome";
+      example = "kde";
+      description = "Which DE to enable";
+    };
+  };
+  config.services = mkIf cfg.enable {
+    displayManager = {
+      sddm.enable = mkIf (cfg.de == "kde") true;
+      gdm.enable = mkIf (cfg.de == "gnome") true;
+    };
+    desktopManager = {
+      plasma6.enable = mkIf (cfg.de == "kde") true;
+      gnome.enable = mkIf (cfg.de == "gnome") true;
+    };
+
+    gnome = mkIf (cfg.de == "gnome") {
+      gnome-browser-connector.enable = true;
+      games.enable = false;
+      gnome-remote-desktop.enable = true;
+      gnome-online-accounts.enable = true;
+      sushi.enable = true;
+    };
+
+    xserver = {
+      inherit (cfg) enable;
+      videoDrivers = lists.optional config.system.hardware.amdgpu.enable "amdgpu";
+      xkb = {
+        layout = "fr";
+        variant = "bepo_afnor";
+      };
+    };
+  };
+}