Implement saved tracks, albums, and artists

src/playlist.rs

@@ -0,0 +1,47 @@
+use std::iter::Iterator;
+use std::sync::Arc;
+
+use queue::Queue;
+use track::Track;
+use traits::ListItem;
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct Playlist {
+    pub id: String,
+    pub name: String,
+    pub snapshot_id: String,
+    pub tracks: Vec<Track>,
+}
+
+impl ListItem for Playlist {
+    fn is_playing(&self, queue: Arc<Queue>) -> bool {
+        let playing: Vec<String> = queue
+            .queue
+            .read()
+            .unwrap()
+            .iter()
+            .map(|t| t.id.clone())
+            .collect();
+        let ids: Vec<String> = self.tracks.iter().map(|t| t.id.clone()).collect();
+        !ids.is_empty() && playing == ids
+    }
+
+    fn display_left(&self) -> String {
+        self.name.clone()
+    }
+
+    fn display_right(&self) -> String {
+        format!("{} tracks", self.tracks.len())
+    }
+
+    fn play(&mut self, queue: Arc<Queue>) {
+        let index = queue.append_next(self.tracks.iter().collect());
+        queue.play(index, true);
+    }
+
+    fn queue(&mut self, queue: Arc<Queue>) {
+        for track in self.tracks.iter() {
+            queue.append(track);
+        }
+    }
+}