initial refactoring

platforms/nixos/modules/nmasur/profiles/gui.nix

@@ -0,0 +1,96 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.nmasur.profiles.gui;
+in
+
+{
+
+  options.nmasur.profiles.gui.enable = lib.mkEnableOption "GUI machine";
+
+  config = lib.mkIf cfg.enable {
+
+    # Mouse customization
+    services.ratbagd.enable = lib.mkDefault true;
+
+    environment.systemPackages = lib.mkDefault [
+      pkgs.libratbag # Mouse adjustments
+      pkgs.piper # Mouse adjustments GUI
+      pkgs.ddcutil # Monitor brightness control
+    ];
+
+    services.libinput.mouse = {
+      # Disable mouse acceleration
+      accelProfile = lib.mkDefault "flat";
+      accelSpeed = lib.mkDefault "1.15";
+    };
+
+    # Enable touchpad support
+    services.libinput.enable = true;
+
+    services.xserver = {
+
+      xkb.layout = lib.mkDefault "us";
+
+      # Keyboard responsiveness
+      autoRepeatDelay = lib.mkDefault 250;
+      autoRepeatInterval = lib.mkDefault 40;
+
+      windowManager = {
+        i3 = {
+          enable = lib.mkDefault true;
+        };
+      };
+
+    };
+
+    # Detect monitors (brightness) for ddcutil
+    hardware.i2c.enable = lib.mkDefault true;
+
+    # Grant main user access to external monitors
+    users.users.${config.user}.extraGroups = lib.mkDefault [ "i2c" ];
+
+    services.xserver.displayManager = {
+
+      # Put the login screen on the left monitor
+      lightdm.greeters.gtk.extraConfig = lib.mkDefault ''
+        active-monitor=0
+      '';
+
+      # Set up screen position and rotation
+      setupCommands = lib.mkDefault ''
+        ${pkgs.xorg.xrandr}/bin/xrandr --output DisplayPort-1 \
+                                            --primary \
+                                            --rotate normal \
+                                            --mode 2560x1440 \
+                                            --rate 165 \
+                                        --output DisplayPort-2 \
+                                            --right-of DisplayPort-1 \
+                                            --rotate left \
+                                        --output DVI-0 --off \
+                                        --output DVI-1 --off \
+                                        || echo "xrandr failed"
+      '';
+    };
+
+    # Required for setting GTK theme (for preferred-color-scheme in browser)
+    services.dbus.packages = [ pkgs.dconf ];
+    programs.dconf.enable = true;
+
+    # Make the login screen dark
+    services.xserver.displayManager.lightdm.greeters.gtk.theme = {
+      name = config.gtk.theme.name;
+      package = config.gtk.theme.package;
+    };
+
+    environment.sessionVariables = {
+      GTK_THEME = config.gtk.theme.name;
+    };
+
+  };
+}