Reworked pkgsets implementation again, still not really what I want yet.

options/machine.nix

@@ -1,16 +1,42 @@
-{ lib, ... }:
+{ config, lib, ... }:
 
+with builtins;
 with lib;
 
-{
+let
+  cfg = config.machine;
+  metapkgs = (lists.forEach
+    (attrNames (filterAttrs (n: v: v == "regular" ) (readDir ../pkgs/pkgsets)))
+    (v: replaceStrings [ ".nix" ] [ "" ] v));
+  pkgOption = pname: {
+    name = pname;
+    value = rec {
+      pkgwrap = mkOption {
+        type = types.listOf types.package;
+        default = cfg.pkgsets."${pname}".pkgs;
+        description = ''
+          Package Wrapper for packages using a wrapper function (like python, emacs, haskell, ...)
+        '';
+      };
+      pkgs = mkOption {
+        type = with types; listOf (nullOr attrs);
+        default = [];
+        description = ''
+          ${pname} package list.
+        '';
+      };
+    };
+  };
+in {
   options.machine = {
     pkgs = mkOption {
-      type = types.listOf types.str;
+      type = (types.listOf (types.enum metapkgs));
       default = [ "base" ];
       description = ''
         The list of metapackages to be installed.
       '';
     };
+    pkgsets = listToAttrs (map pkgOption metapkgs);
     services = mkOption {
       type = types.listOf types.str;
       default = [];