with import <stockholm/lib>; let eval = _file: source: evalModules { modules = singleton { inherit _file; imports = map (source: { inherit source; }) (toList source); options.source = mkOption { type = types.attrsOf types.source; default = {}; }; }; }; in # This function's return value can be used as pkgs.populate input. _file: source: (eval _file source).config.source