add option to download and keep playlist order

src/main.rs

@@ -2,25 +2,28 @@ mod file_sink;
 
 extern crate rpassword;
 
-use std::{path::PathBuf};
+use std::path::PathBuf;
 
-use librespot::{core::authentication::Credentials, metadata::Playlist};
 use librespot::core::config::SessionConfig;
 use librespot::core::session::Session;
 use librespot::core::spotify_id::SpotifyId;
 use librespot::playback::config::PlayerConfig;
+use librespot::{core::authentication::Credentials, metadata::Playlist};
 
+use librespot::playback::audio_backend::Open;
 use librespot::playback::player::Player;
-use librespot::playback::audio_backend::{Open};
 
-use librespot::metadata::{Track, Artist, Metadata, Album};
+use librespot::metadata::{Album, Artist, Metadata, Track};
 
 use structopt::StructOpt;
 
 use indicatif::{ProgressBar, ProgressStyle};
 
 #[derive(Debug, StructOpt)]
-#[structopt(name = "spotify-dl", about = "A commandline utility to download music directly from Spotify")]
+#[structopt(
+    name = "spotify-dl",
+    about = "A commandline utility to download music directly from Spotify"
+)]
 struct Opt {
     #[structopt(help = "A list of Spotify URIs (songs, podcasts or playlists)")]
     tracks: Vec<String>,
@@ -28,8 +31,19 @@ struct Opt {
     username: String,
     #[structopt(short = "p", long = "password", help = "Your Spotify password")]
     password: Option<String>,
-    #[structopt(short = "d", long = "destination", default_value = ".", help = "The directory where the songs will be downloaded")]
-    destination: String
+    #[structopt(
+        short = "d",
+        long = "destination",
+        default_value = ".",
+        help = "The directory where the songs will be downloaded"
+    )]
+    destination: String,
+    #[structopt(
+        short = "o",
+        long = "ordered",
+        help = "Download songs in the order they are in the playlist, prfixing the filename with the track number"
+    )]
+    ordered: bool,
 }
 
 #[derive(Clone)]
@@ -41,11 +55,18 @@ pub struct TrackMetadata {
 
 async fn create_session(credentials: Credentials) -> Session {
     let session_config = SessionConfig::default();
-    let session = Session::connect(session_config, credentials, None).await.unwrap();
+    let session = Session::connect(session_config, credentials, None)
+        .await
+        .unwrap();
     session
 }
 
-async fn download_tracks(session: &Session, destination: PathBuf, tracks: Vec<SpotifyId>) {
+async fn download_tracks(
+    session: &Session,
+    destination: PathBuf,
+    tracks: Vec<SpotifyId>,
+    ordered: bool,
+) {
     let player_config = PlayerConfig::default();
     let bar_style = ProgressStyle::default_bar()
         .template("[{elapsed_precise}] {bar:40.cyan/blue} {pos:>7}/{len:7} (ETA: {eta}) {msg}")
@@ -54,14 +75,14 @@ async fn download_tracks(session: &Session, destination: PathBuf, tracks: Vec<Sp
     bar.set_style(bar_style);
     bar.enable_steady_tick(500);
 
-    for track in tracks {
-        let track_item = Track::get(&session, track).await.unwrap();
+    for (i, track) in tracks.iter().enumerate() {
+        let track_item = Track::get(&session, *track).await.unwrap();
         let artist_name: String;
 
         let mut metadata = TrackMetadata {
             artists: Vec::new(),
             track_name: track_item.name,
-            album: Album::get(session, track_item.album).await.unwrap().name
+            album: Album::get(session, track_item.album).await.unwrap().name,
         };
         if track_item.artists.len() > 1 {
             let mut tmp: String = String::new();
@@ -72,22 +93,33 @@ async fn download_tracks(session: &Session, destination: PathBuf, tracks: Vec<Sp
                 tmp.push_str(", ");
             }
             artist_name = String::from(tmp.trim_end_matches(", "));
-        }
-        else {
-            artist_name = Artist::get(&session, track_item.artists[0]).await.unwrap().name;
+        } else {
+            artist_name = Artist::get(&session, track_item.artists[0])
+                .await
+                .unwrap()
+                .name;
             metadata.artists.push(artist_name.clone());
         }
         let full_track_name = format!("{} - {}", artist_name, metadata.track_name);
-        let filename = format!("{}.flac", full_track_name);
+        let filename: String;
+        if ordered {
+            filename = format!("{:02} - {}.flac", i + 1, full_track_name);
+        } else {
+            filename = format!("{}.flac", full_track_name);
+        }
         let joined_path = destination.join(&filename);
         let path = joined_path.to_str().unwrap();
         bar.set_message(full_track_name.as_str());
-        let mut file_sink = file_sink::FileSink::open(Some(path.to_owned()), librespot::playback::config::AudioFormat::S16);
+        let mut file_sink = file_sink::FileSink::open(
+            Some(path.to_owned()),
+            librespot::playback::config::AudioFormat::S16,
+        );
         file_sink.add_metadata(metadata);
-        let (mut player, _) = Player::new(player_config.clone(), session.clone(), None, move || {
-            Box::new(file_sink)
-        });
-        player.load(track, true, 0);
+        let (mut player, _) =
+            Player::new(player_config.clone(), session.clone(), None, move || {
+                Box::new(file_sink)
+            });
+        player.load(*track, true, 0);
         player.await_end_of_track().await;
         player.stop();
         bar.inc(1);
@@ -97,11 +129,12 @@ async fn download_tracks(session: &Session, destination: PathBuf, tracks: Vec<Sp
 
 #[tokio::main]
 async fn main() {
-
     let opt = Opt::from_args();
 
     let username = opt.username;
-    let password = opt.password.unwrap_or_else(|| rpassword::read_password_from_tty(Some("Password: ")).unwrap());
+    let password = opt
+        .password
+        .unwrap_or_else(|| rpassword::read_password_from_tty(Some("Password: ")).unwrap());
     let credentials = Credentials::with_password(username, password);
 
     let session = create_session(credentials.clone()).await;
@@ -120,7 +153,10 @@ async fn main() {
             librespot::core::spotify_id::SpotifyAudioType::NonPlayable => {
                 match Playlist::get(&session, track).await {
                     Ok(mut playlist) => {
-                        println!("Adding all songs from playlist {} (by {}) to the queue", &playlist.name, &playlist.user);
+                        println!(
+                            "Adding all songs from playlist {} (by {}) to the queue",
+                            &playlist.name, &playlist.user
+                        );
                         tracks.append(&mut playlist.tracks);
                     }
                     Err(_) => {
@@ -131,6 +167,11 @@ async fn main() {
         }
     }
 
-    download_tracks(&session, PathBuf::from(opt.destination), tracks).await;
-
+    download_tracks(
+        &session,
+        PathBuf::from(opt.destination),
+        tracks,
+        opt.ordered,
+    )
+    .await;
 }