Add add command for adding song to playlist (#1232)

* Add command for adding song to playlist

* edits for code style

* Return playlist dialog via `CommandResult::Modal`

---------

Co-authored-by: Henrik Friedrichsen <henrik@affekt.org>

src/ui/listview.rs

@@ -520,6 +520,25 @@ impl<I: ListItem + Clone> ViewExt for ListView<I> {
 
                 return Ok(CommandResult::Consumed(None));
             }
+            Command::Add => {
+                let item = {
+                    let content = self.content.read().unwrap();
+                    content.get(self.selected).cloned()
+                };
+
+                if let Some(track) = item {
+                    if let Some(track) = track.track() {
+                        let dialog = ContextMenu::add_track_dialog(
+                            self.library.clone(),
+                            self.queue.get_spotify(),
+                            track,
+                        );
+                        return Ok(CommandResult::Modal(Box::new(dialog)));
+                    }
+                }
+
+                return Ok(CommandResult::Consumed(None));
+            }
             Command::Delete => {
                 let mut item = {
                     let content = self.content.read().unwrap();