const lisp::Lisp* config_lisp = root->get_lisp("supertux-config");
if(!config_lisp)
throw std::runtime_error("File is not a supertux-config file");
config_lisp->get("show_fps", show_fps);
const lisp::Lisp* config_lisp = root->get_lisp("supertux-config");
if(!config_lisp)
throw std::runtime_error("File is not a supertux-config file");
config_lisp->get("show_fps", show_fps);