added displaymanager.nix

hosts/vali/mars/awesome.nix

@@ -0,0 +1,21 @@
+{ pkgs, lib, config, callPackage, ... }:
+with lib; let
+  cfg = config.myOptions.programs.i3;
+in {
+  options.myOptions.programs.i3.enable = mkEnableOption "i3";
+
+  config = mkIf cfg.enable {
+    services.xserver = {
+      enable = true;
+      xkb.layout =  "de";
+      windowManager = {
+          bspwm.enable = true;
+          i3.enable = true;
+      };
+      displayManager = {
+          gdm.enable = true;
+          defaultSession = "none+i3";
+      };
+    };
+  };
+}

hosts/vali/mars/configuration.nix

@@ -25,6 +25,7 @@
           i3.enable = true;
           schizofox.enable = true;
           obs.enable = true;
+          displaymanager.enable = true;
           #neovim.enable = true;
           #git = {
           #    enable = true;

modules/other/default.nix

@@ -3,5 +3,6 @@ _: {
         ./home-manager.nix
         ./system.nix
         ./xdg.nix
+        ./displaymanager.nix
     ];
 }

modules/other/displaymanager.nix

@@ -0,0 +1,13 @@
+{pkgs, lib, config, ...}:
+with lib; let 
+    cfg = config.myOptions.programs.displaymanager;
+in {
+    options.myOptions.programs.displaymanager.enable = mkEnableOption "displaymanager";
+
+    config = mkIf cfg.enable {
+        services.xserver.displayManager = {
+          gdm.enable = true;
+          defaultSession = "none+i3";
+        }
+      }
+}