Merge pull request #429 from montchr/add-toplevel-option-lib

Add top-level `lib` option based on NixOS

modules/misc/lib.nix

@@ -0,0 +1,15 @@
+{ lib, ... }:
+
+{
+  options = {
+    lib = lib.mkOption {
+      default = { };
+
+      type = lib.types.attrsOf lib.types.attrs;
+
+      description = ''
+        This option allows modules to define helper functions, constants, etc.
+      '';
+    };
+  };
+}

modules/module-list.nix

@@ -1,6 +1,7 @@
 [
   ./alias.nix
   ./documentation
+  ./misc/lib.nix
   ./security/pki
   ./security/sandbox
   ./system