initial refactoring

platforms/nixos/modules/nmasur/presets/services/grub.nix

@@ -0,0 +1,56 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.nmasur.presets.services.grub;
+in
+
+{
+
+  options.nmasur.presets.services.grub.enable = lib.mkEnableOption "Grub bootloader";
+
+  config = lib.mkIf cfg.enable {
+
+    boot.loader = {
+      grub = {
+        enable = true;
+
+        # Not sure what this does, but it involves the UEFI/BIOS
+        efiSupport = true;
+
+        # Check for other OSes and make them available
+        useOSProber = true;
+
+        # Attempt to display GRUB on widescreen monitor
+        gfxmodeEfi = "1920x1080";
+
+        # Limit the total number of configurations to rollback
+        configurationLimit = 25;
+
+        # Install GRUB onto the boot disk
+        # device = config.fileSystems."/boot".device;
+
+        # Don't install GRUB, required for UEFI?
+        device = "nodev";
+
+        # Display menu indefinitely if holding shift key
+        extraConfig = ''
+          if keystatus --shift ; then
+              set timeout=-1
+          else
+              set timeout=3
+          fi
+        '';
+      };
+
+      # Always display menu indefinitely; default is 5 seconds
+      # timeout = null;
+
+      # Allows GRUB to interact with the UEFI/BIOS I guess
+      efi.canTouchEfiVariables = true;
+    };
+  };
+}