Function bliss_audio::playlist::song_to_song_by_key

pub fn song_to_song_by_key<F, T: PartialEq + Clone>(
    first_song: &T,
    songs: &mut Vec<T>,
    distance: impl DistanceMetric,
    key_fn: F
)
where
    F: Fn(&T) -> Song,

Sort songs in place using the distance metric and ordering by the smallest distance between each song.

If the generated playlist is [song1, song2, song3, song4], it means song2 is closest to song1, song3 is closest to song2, and song4 is closest to song3.

Note that this has a tendency to go from one style to the other very fast, and it can be slow on big libraries.

Sort songs with a key extraction function, useful for when you have a structure like CustomSong { bliss_song: Song, something_else: bool }