swtch displayManager from gdm to greetd

nixos/configurations/Akun/default.nix

@@ -1,5 +1,6 @@
 {pkgs, ...}: {
   imports = [
+    ./gui.nix
     ./hardware-configuration.nix
     ./stylix.nix
     ./users
@@ -21,7 +22,6 @@
       kanata.enable = true;
       tailscale.enable = true;
     };
-    gui.enabled = "niri";
   };
   programs.gnupg.agent = {
     enable = true;

nixos/configurations/Akun/gui.nix

@@ -0,0 +1,20 @@
+{...}: let
+  extraConfig = ''
+    output "eDP-1" {
+      mode "1920x1200@60.018"
+      scale 1.0
+      focus-at-startup
+      position x=0 y=0
+      transform "normal"
+    }
+    window-rule {
+      match app-id="apps.regreet"
+      open-on-output "eDP-1"
+    }
+  '';
+in {
+  youthlic.gui = {
+    enabled = "niri";
+    niri.extraConfig = extraConfig;
+  };
+}

nixos/configurations/Tytonidae/default.nix

@@ -2,6 +2,7 @@
   lib,
   pkgs,
   inputs,
+  config,
   ...
 }: {
   imports =
@@ -11,6 +12,7 @@
     ++ [
       ./users
       ./stylix.nix
+      ./gui.nix
 
       # Include the hardware related config
       ./hardware-configuration.nix
@@ -44,7 +46,6 @@
       owncast.enable = true;
       minio.enable = true;
     };
-    gui.enabled = "niri";
   };
 
   # specialisation = {

nixos/configurations/Tytonidae/gui.nix

@@ -0,0 +1,26 @@
+{pkgs, ...}: let
+  extraConfig = ''
+    output "DP-1" {
+      mode "2560x1440@169.900"
+      scale 1.0
+      position x=0 y=0
+      transform "normal"
+      focus-at-startup
+    }
+    output "eDP-1" {
+      mode "2560x1440@165.003"
+      scale 1.5
+      position x=2560 y=0
+      transform "normal"
+    }
+    window-rule {
+      match app-id="apps.regreet"
+      open-on-output "DP-1"
+    }
+  '';
+in {
+  youthlic.gui = {
+    enabled = "niri";
+    niri.extraConfig = extraConfig;
+  };
+}

nixos/modules/gui/niri.nix

@@ -6,6 +6,13 @@
 }: let
   cfg = config.youthlic.gui;
 in {
+  options = {
+    youthlic.gui.niri = {
+      extraConfig = lib.mkOption {
+        type = lib.types.str;
+      };
+    };
+  };
   config = lib.mkIf (cfg.enabled == "niri") {
     qt = {
       enable = true;
@@ -61,20 +68,49 @@ in {
     hardware.bluetooth = {
       enable = true;
     };
-    services.xserver = {
-      enable = true;
-      xkb = {
-        layout = "cn";
-        variant = "";
-      };
-      displayManager.gdm = {
+    services = {
+      greetd = let
+        niriConfig = pkgs.writeText "greetd-niri-config.kdl" (''
+            binds {}
+            hotkey-overlay {
+              skip-at-startup
+            }
+            gestures {
+              hot-corners {
+                off
+              }
+            }
+            spawn-at-startup "${lib.getExe pkgs.swaybg}" "-i" "${config.stylix.image}"
+          ''
+          + config.youthlic.gui.niri.extraConfig);
+      in {
         enable = true;
-        wayland = true;
+        settings = {
+          default_session = {
+            command = "env GTK_USE_PORTAL=0 GDK_DEBUG=no-portals ${lib.getExe' config.programs.niri.package "niri"} --config ${niriConfig} -- ${lib.getExe config.programs.regreet.package}";
+          };
+        };
+      };
+      xserver = {
+        enable = true;
+        xkb = {
+          layout = "us";
+          variant = "";
+        };
+        # displayManager.gdm = {
+        #   enable = true;
+        #   wayland = true;
+        # };
       };
     };
-    programs.niri = {
-      enable = true;
-      package = pkgs.niri-unstable;
+    programs = {
+      regreet = {
+        enable = true;
+      };
+      niri = {
+        enable = true;
+        package = pkgs.niri-unstable;
+      };
     };
   };
 }