Add dialog for adding duplicate tracks to a playlist (#299)

* Add dialog for adding duplicate tracks to a playlist

* use local playlist store to check for duplicates

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

src/ui/contextmenu.rs

@@ -36,7 +36,28 @@ impl ContextMenu {
         }
 
         list_select.set_on_submit(move |s, selected| {
-            library.playlist_append_tracks(selected, &[track.clone()]);
+            let track = track.clone();
+
+            if library.playlist_has_track(selected, &track.id.as_ref().unwrap_or(&"".to_string())) {
+                let mut already_added_dialog = Self::track_already_added();
+
+                let lib = Arc::clone(&library);
+                let selected = selected.to_string();
+                already_added_dialog.add_button("Add anyway", move |c| {
+                    lib.playlist_append_tracks(&selected.clone(), &[track.clone()]);
+                    c.pop_layer();
+
+                    // Close add_track_dialog too
+                    c.pop_layer();
+                });
+
+                let modal = Modal::new(already_added_dialog);
+                s.add_layer(modal);
+
+                return;
+            }
+
+            library.playlist_append_tracks(selected, &[track]);
             s.pop_layer();
         });
 
@@ -48,6 +69,13 @@ impl ContextMenu {
         Modal::new(dialog)
     }
 
+    fn track_already_added() -> Dialog {
+        Dialog::text("This track is already in your playlist")
+            .title("Track already exists")
+            .padding(Margins::lrtb(1, 1, 1, 0))
+            .dismiss_button("Cancel")
+    }
+
     pub fn new(item: &dyn ListItem, queue: Arc<Queue>, library: Arc<Library>) -> NamedView<Self> {
         let mut content: SelectView<ContextMenuAction> = SelectView::new().autojump();
         if let Some(a) = item.artist() {