export_list const &exlist)

{

if (options->tag_transform_script) {

#ifdef HAVE_LUA

fmt::print(stderr,

"Using lua based tag processing pipeline with script {}\n",

options->tag_transform_script.get());

return std::unique_ptr<tagtransform_t>(new lua_tagtransform_t{options});

#else

throw std::runtime_error{"Error: Could not init lua tag transform, as "

"lua support was not compiled into this "

"version"};

#endif

}

fmt::print(stderr, "Using built-in tag processing pipeline\n");

return std::unique_ptr<tagtransform_t>(

new c_tagtransform_t{options, exlist});