Show tracks + duration of album, playlist, queue

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Fixes #475

src/ui/album.rs

@@ -66,6 +66,17 @@ impl ViewExt for AlbumView {
         format!("{} ({})", self.album.title, self.album.year)
     }
 
+    fn title_sub(&self) -> String {
+        if let Some(tracks) = &self.album.tracks {
+            let duration_secs: u64 = tracks.iter().map(|t| t.duration as u64 / 1000).sum();
+            let duration = std::time::Duration::from_secs(duration_secs);
+            let duration_str = crate::utils::format_duration(&duration);
+            format!("{} tracks, {}", tracks.len(), duration_str)
+        } else {
+            "".to_string()
+        }
+    }
+
     fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
         self.tabs.on_command(s, cmd)
     }

src/ui/layout.rs

@@ -219,6 +219,11 @@ impl View for Layout {
                 printer.print((offset, 0), &view.title());
             });
 
+            printer.with_color(ColorStyle::secondary(), |printer| {
+                let offset = HAlign::Right.get_offset(view.title_sub().width(), printer.size.x);
+                printer.print((offset, 0), &view.title_sub());
+            });
+
             // screen content
             let printer = &printer
                 .offset((0, 1))

src/ui/playlist.rs

@@ -62,6 +62,20 @@ impl ViewExt for PlaylistView {
         self.playlist.name.clone()
     }
 
+    fn title_sub(&self) -> String {
+        if let Some(tracks) = self.playlist.tracks.as_ref() {
+            let duration_secs = tracks.iter().map(|p| p.duration as u64 / 1000).sum();
+            let duration = std::time::Duration::from_secs(duration_secs);
+            format!(
+                "{} tracks, {}",
+                tracks.len(),
+                crate::utils::format_duration(&duration)
+            )
+        } else {
+            "".to_string()
+        }
+    }
+
     fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
         if let Command::Delete = cmd {
             let pos = self.list.get_selected_index();

src/ui/queue.rs

@@ -93,6 +93,29 @@ impl ViewExt for QueueView {
         "Queue".to_string()
     }
 
+    fn title_sub(&self) -> String {
+        let track_count = self.queue.len();
+        let duration_secs: u64 = self
+            .queue
+            .queue
+            .read()
+            .unwrap()
+            .iter()
+            .map(|p| p.duration() as u64 / 1000)
+            .sum();
+
+        if duration_secs > 0 {
+            let duration = std::time::Duration::from_secs(duration_secs);
+            format!(
+                "{} tracks, {}",
+                track_count,
+                crate::utils::format_duration(&duration)
+            )
+        } else {
+            "".to_string()
+        }
+    }
+
     fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
         match cmd {
             Command::Play => {