more progress on custom options config

modules/global/options.nix

@@ -0,0 +1,41 @@
+{ inputs, self, ... }: {
+  flake.nixosModules.global = { pkgs, config, lib, ... }: {
+    options = {
+      info = {
+        rootPath = lib.mkOption {
+          type = lib.types.str;
+          default = "/home/grey/nixos";
+        };
+
+        hostName = lib.mkOption {
+          type = lib.types.str;
+          default = "";
+        };
+
+        stateVersion = lib.mkOption {
+          type = lib.types.str;
+          default = "";
+        };
+      };
+
+      components.bootLoader = lib.mkOption {
+        type = lib.types.enum (map (name: lib.removeSuffix ".nix" name) (
+          builtins.attrNames (builtins.readDir "${self}/modules/components/boot-loaders")
+        ));
+        default = "grub";
+      };
+
+      features.applications = {
+        extraPackages = lib.mkOption {
+          type = lib.types.listOf (lib.types.package);
+          default = [];
+        };
+
+        extraUserPackages = lib.mkOption {
+          type = lib.types.listOf (lib.types.package);
+          default = [];
+        };
+      };
+    };
+  };
+}