refactor pkgs/lib -> lib, kw.fw -> network.firewall, ...

lib/module-list.nix

@@ -0,0 +1,28 @@
+{ lib }: { modulesDir, defaultFile ? "default.nix", importAll ? false }:
+
+with builtins;
+
+let
+  isModule = m: lib.isFunction m && (m.isModule or true);
+  filterAttrNamesToList = filter: set:
+    foldl' (a: b: a ++ b) [ ]
+      (map (e: if (filter e set.${e}) then [ e ] else [ ]) (attrNames set));
+  nameValuePair = name: value: { inherit name value; };
+  listToAttrs = foldl' (acc: val: acc // { ${val.name} = val.value; }) { };
+  directories =
+    filterAttrNamesToList (_: type: type == "directory") (readDir modulesDir);
+  files = map (dir: nameValuePair dir (modulesDir + "/${dir}/${defaultFile}"))
+  (filter (f: builtins.pathExists (modulesDir + "/${f}/${defaultFile}")) directories);
+  modules = map
+    ({ name, value }:
+      # if the file contains a function, assume it to be a module and pass the path
+      # (for dedup and such). if it contains anything else, pass that.
+      let m = import value;
+      in
+      {
+        inherit name;
+        value = if lib.isFunction m && ! isModule m then m { inherit lib; } else if isModule m && !importAll then value else m;
+      })
+    files;
+in
+(listToAttrs modules)