home/fuji: add river wm

fuji/configuration.nix

@@ -8,6 +8,19 @@
 }:
 let
   USER = "akill";
+
+  river-session = pkgs.runCommand "river-session"
+    { passthru.providedSessions = [ "river" ]; }
+    ''
+      install -Dm444 ${pkgs.writeText "river.desktop" ''
+        [Desktop Entry]
+        Name=River
+        Comment=A non-monolithic Wayland compositor
+        Exec=${lib.getExe pkgs.river}
+        Type=Application
+        DesktopNames=river
+      ''} $out/share/wayland-sessions/river.desktop
+    '';
 in
 {
   imports = [ ./wireguard.nix ];
@@ -206,6 +219,7 @@ in
     systemPackages = with pkgs; [
       maliit-keyboard
       android-tools
+      river
     ];
 
     sessionVariables = {
@@ -242,7 +256,6 @@ in
       enable = true;
       enableSSHSupport = true;
     };
-    hyprland.enable = true;
     steam = {
       enable = true;
       remotePlay.openFirewall = true;
@@ -262,6 +275,7 @@ in
   xdg.portal = {
     enable = true;
     wlr.enable = true;
+    config.river.default = [ "wlr" "gtk" ];
   };
 
   documentation.dev.enable = true;
@@ -318,6 +332,8 @@ in
     upower.enable = lib.mkForce false;
     userborn.enable = true;
 
+    displayManager.sessionPackages = [ river-session ];
+
     greetd = {
       enable = true;
       settings = {
@@ -328,6 +344,7 @@ in
               --remember \
               --remember-session \
               --greeting 'Welcome to NixOS' \
+              --sessions ${config.services.displayManager.sessionData.desktops}/share/wayland-sessions \
               --cmd sway
           '';
           user = "greeter";