feat: browse channel playlists

tests/unit/app.rs

@@ -3749,6 +3749,78 @@ fn back_history_uses_source_identity_after_config_reorders_or_removes_views() {
     assert!(app.job.is_none());
 }
 
+#[test]
+fn channel_playlists_filter_open_in_provider_order_and_retain_history_and_config() {
+    let mut app = app(&["tubular"]);
+    let press = |app: &mut App, code| {
+        app.key(KeyEvent::new(code, KeyModifiers::NONE));
+    };
+    press(&mut app, KeyCode::Char('L'));
+    assert!(app.browser.is_none());
+    let channel = ViewSource::Channel("https://www.youtube.com/@RustVideos".into());
+    let mut view = View::new("@RustVideos".into(), channel.clone());
+    view.loaded = true;
+    app.views.push(view);
+    app.switch_view(app.views.len() - 1);
+    press(&mut app, KeyCode::Char('L'));
+    assert_eq!(app.browser.as_ref().unwrap().kind, BrowserKind::Playlists);
+    app.finish_playlists(Ok(r#"{"entries":[{"id":"PLJ5MFiMfElFA","title":"Conference"},{"id":"PLJ5MFiMfElFB","title":"Tutorials"}]}"#.into()));
+    press(&mut app, KeyCode::Char('i'));
+    app.paste("tutor");
+    assert_eq!(
+        app.browser.as_ref().unwrap().selected_choice().unwrap().0,
+        "Tutorials"
+    );
+    press(&mut app, KeyCode::Enter);
+    assert!(app.browser.is_none());
+    let playlist = ViewSource::Playlist("PLJ5MFiMfElFB".into());
+    assert_eq!(app.views[app.view_index].source, playlist);
+    app.finish_page(Ok(r#"{"entries":[{"id":"jNQXAC9IVRw","title":"First","timestamp":100},{"id":"rQ_J9WH6CGk","title":"Second","timestamp":200}]}"#.into()));
+    let view = &app.views[app.view_index];
+    assert_eq!(
+        view.videos
+            .iter()
+            .map(|video| video.title.as_str())
+            .collect::<Vec<_>>(),
+        ["First", "Second"]
+    );
+    assert!(!view.has_more);
+    press(&mut app, KeyCode::Char('j'));
+    press(&mut app, KeyCode::Char(' '));
+    assert_eq!(
+        app.views[app.view_index].playback_videos()[0].id,
+        "rQ_J9WH6CGk"
+    );
+    press(&mut app, KeyCode::Char('-'));
+    assert_eq!(app.views[app.view_index].source, channel);
+    press(&mut app, KeyCode::Char('+'));
+    assert_eq!(app.views[app.view_index].source, playlist);
+    assert_eq!(app.views[app.view_index].selection.selected(), Some(1));
+    app.apply_config(config::Config {
+        categories: [("Unrelated".into(), Vec::new())].into(),
+        ..Default::default()
+    });
+    assert_eq!(app.views[app.view_index].source, playlist);
+    assert_eq!(app.temporary_view, Some(playlist));
+    assert_eq!(app.views[app.view_index].selection.selected(), Some(1));
+    assert!(app.config.subscriptions().is_empty());
+    press(&mut app, KeyCode::Char('-'));
+    press(&mut app, KeyCode::Char('L'));
+    app.finish_playlists(Err("Extractor failed".into()));
+    assert_eq!(
+        app.browser.as_ref().unwrap().error.as_deref(),
+        Some("Extractor failed")
+    );
+    press(&mut app, KeyCode::Esc);
+    assert!(app.browser.is_none());
+    press(&mut app, KeyCode::Char('L'));
+    app.finish_playlists(Ok(r#"{"entries":[]}"#.into()));
+    assert!(app.browser.as_ref().unwrap().choices.is_empty());
+    assert!(app.browser.as_ref().unwrap().error.is_none());
+    press(&mut app, KeyCode::Esc);
+    assert_eq!(app.views[app.view_index].source, channel);
+}
+
 #[test]
 fn video_channel_shortcut_reuses_saved_views_and_requires_valid_identity() {
     let mut app = app(&["tubular"]);