Make distance functions coherent

Cargo.lock

@@ -85,7 +85,7 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bliss-audio"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "anyhow",
  "bliss-audio-aubio-rs",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "bliss-audio"
-version = "0.5.1"
+version = "0.5.2"
 authors = ["Polochon-street <polochonstreet@gmx.fr>"]
 edition = "2018"
 license = "GPL-3.0-only"

src/playlist.rs

@@ -39,7 +39,11 @@ pub fn cosine_distance(a: &Array1<f32>, b: &Array1<f32>) -> f32 {
 
 /// Sort `songs` in place by putting songs close to `first_song` first
 /// using the `distance` metric.
-pub fn closest_to_first_song(first_song: &Song, songs: &mut [Song], distance: impl DistanceMetric) {
+pub fn closest_to_first_song(
+    first_song: &Song,
+    #[allow(clippy::ptr_arg)] songs: &mut Vec<Song>,
+    distance: impl DistanceMetric,
+) {
     songs.sort_by_cached_key(|song| n32(first_song.custom_distance(song, &distance)));
 }
 
@@ -115,6 +119,8 @@ pub fn dedup_playlist_custom_distance(
 /// songs in `group`, discarding songs that don't belong to an album.
 /// It basically makes an "album" playlist from the `pool` of songs.
 ///
+/// `group` should be ordered by track number.
+///
 /// Songs from `group` would usually just be songs from an album, but not
 /// necessarily - they are discarded from `pool` no matter what.
 ///