pub fn extractors_by_id(
ids: &[&str],
libraries: &[Library],
) -> Vec<&'static Extractor>Expand description
The extractors with any of these ids, from these libraries, in the
libraries’ own order: music21’s extractorsById. An id is read without
regard to case, hyphens or spaces, so p-20 finds P20; the id all,
first, finds every extractor. Both libraries have a P22, so asking for
it in both finds two.