implement deletion of playlists

closes #11

README.md

@@ -44,6 +44,7 @@ have them configurable.
     * `s` opens a dialog to save the queue to a playlist
   * `F2`: Search
   * `F3`: Playlists
+    * `d` deletes the currently selected playlist
 * Tracks and playlists can be played using `Return` and queued using `Space`
 * `Shift-p` toggles playback of a track
 * `Shift-s` stops a track

src/commands.rs

@@ -288,6 +288,16 @@ impl CommandManager {
                         });
                     }
 
+                    {
+                        if let Some(Some(dialog)) = s
+                            .call_on_id("playlists", |v: &mut ui::playlists::PlaylistView| {
+                                v.delete_dialog()
+                            })
+                        {
+                            s.add_layer(dialog);
+                        }
+                    }
+
                     Ok(None)
                 }),
             );

src/main.rs

@@ -160,7 +160,7 @@ fn main() {
 
     let mut layout = ui::layout::Layout::new(status, &event_manager, theme)
         .view("search", search.with_id("search"), "Search")
-        .view("playlists", playlistsview, "Playlists")
+        .view("playlists", playlistsview.with_id("playlists"), "Playlists")
         .view("queue", queueview, "Queue");
 
     // initial view is queue

src/playlists.rs

@@ -150,6 +150,16 @@ impl Playlists {
         store.len() - 1
     }
 
+    pub fn delete_playlist(&self, id: &str) {
+        let mut store = self.store.write().expect("can't writelock playlists");
+        if let Some(position) = store.iter().position(|ref i| i.meta.id == id) {
+            if self.spotify.delete_playlist(id) {
+                store.remove(position);
+                self.save_cache();
+            }
+        }
+    }
+
     pub fn overwrite_playlist(&self, id: &str, tracks: &[Track]) {
         debug!("saving {} tracks to {}", tracks.len(), id);
         self.spotify.overwrite_playlist(id, &tracks);

src/spotify.rs

@@ -404,6 +404,11 @@ impl Spotify {
         }
     }
 
+    pub fn delete_playlist(&self, id: &str) -> bool {
+        self.api_with_retry(|api| api.user_playlist_unfollow(&self.user, id))
+            .is_some()
+    }
+
     pub fn create_playlist(
         &self,
         name: &str,

src/ui/playlists.rs

@@ -2,14 +2,17 @@ use std::sync::Arc;
 
 use cursive::traits::Identifiable;
 use cursive::view::ViewWrapper;
-use cursive::views::IdView;
+use cursive::views::{Dialog, IdView};
+use cursive::Cursive;
 
 use playlists::{Playlist, Playlists};
 use queue::Queue;
 use ui::listview::ListView;
+use ui::modal::Modal;
 
 pub struct PlaylistView {
     list: IdView<ListView<Playlist>>,
+    playlists: Playlists,
 }
 
 pub const LIST_ID: &str = "playlist_list";
@@ -17,7 +20,32 @@ impl PlaylistView {
     pub fn new(playlists: &Playlists, queue: Arc<Queue>) -> PlaylistView {
         let list = ListView::new(playlists.store.clone(), queue).with_id(LIST_ID);
 
-        PlaylistView { list }
+        PlaylistView {
+            list,
+            playlists: playlists.clone(),
+        }
+    }
+
+    pub fn delete_dialog(&mut self) -> Option<Modal<Dialog>> {
+        let list = self.list.get_mut();
+        let store = self.playlists.items();
+        let current = store.get(list.get_selected_index());
+
+        if let Some(playlist) = current {
+            let playlists = self.playlists.clone();
+            let id = playlist.meta.id.clone();
+            let dialog = Dialog::text("Are you sure you want to delete this playlist?")
+                .padding((1, 1, 1, 0))
+                .title("Delete playlist")
+                .dismiss_button("No")
+                .button("Yes", move |s: &mut Cursive| {
+                    playlists.delete_playlist(&id);
+                    s.pop_layer();
+                });
+            Some(Modal::new(dialog))
+        } else {
+            None
+        }
     }
 }