You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: artists.rs
    path of file: ./repos/spotify-tui/src/handlers
    
    the code of the file until where you have to start completion: use super::common_key_events;
use crate::{
  app::{ActiveBlock, App, RecommendationsContext, RouteId},
  event::Key,
  network::IoEvent,
};

pub fn handler(key: Key, app: &mut App) {
  match key {
    k if common_key_events::left_event(k) => common_key_events::handle_left_event(app),
    k if common_key_events::down_event(k) => {
      if let Some(artists) = &mut app.library.saved_artists.ge
    
pub fn handler(key: Key, app: &mut App) {
  match key {
    k if common_key_events::left_event(k) => common_key_events::handle_left_event(app),
    k if common_key_events::down_event(k) => {
      if let Some(artists) = &mut app.library.saved_artists.get_results(None) {
        let next_index =
          common_key_events::on_down_press_handler(&artists.items, Some(app.artists_list_index));
        app.artists_list_index = next_index;
      }
    }
    k if common_key_events::up_event(k) => {
      if let Some(artists) = &mut app.library.saved_artists.get_results(None) {
        let next_index =
          common_key_events::on_up_press_handler(&artists.items, Some(app.artists_list_index));
        app.artists_list_index = next_index;
      }
    }
    k if common_key_events::high_event(k) => {
      if let Some(_artists) = &mut app.library.saved_artists.get_results(None) {
        let next_index = common_key_events::on_high_press_handler();
        app.artists_list_index = next_index;
      }
    }
    k if common_key_events::middle_event(k) => {
      if let Some(artists) = &mut app.library.saved_artists.get_results(None) {
        let next_index = common_key_events::on_middle_press_handler(&artists.items);
        app.artists_list_index = next_index;
      }
    }
    k if common_key_events::low_event(k) => {
      if let Some(artists) = &mut app.library.saved_artists.get_results(None) {
        let next_index = common_key_events::on_low_press_handler(&artists.items);
        app.artists_list_index = next_index;
      }
    }
    Key::Enter => {
      let artists = app.artists.to_owned();
      if !artists.is_empty() {
        let artist = &artists[app.artists_list_index];
        app.get_artist(artist.id.clone(), artist.name.clone());
        app.push_navigation_stack(RouteId::Artist, ActiveBlock::ArtistBlock);
      }
    }
    Key::Char('D') => app.user_unfollow_artists(ActiveBlock::AlbumList),
    Key::Char('e') => {
      let artists = app.artists.to_owned();
      let artist = artists.get(app.artists_list_index);
      if let Some(artist) = artist {
        app.dispatch(IoEvent::StartPlayback(
          Some(artist.uri.to_owned()),
          None,
          None,
        ));
      }
    }
    Key::Char('r') => {
      let artists = app.artists.to_owned();
      let artist = artists.get(app.artists_list_index);
      if let Some(artist) = artist {
        let artist_name = artist.name.clone();
        let artist_id_list: Option<Vec<String>> = Some(vec![artist.id.clone()]);

        app.recommendations_context = Some(RecommendationsContext::Artist);
        app.recommendations_seed = artist_name;
        app.get_recommendations_for_seed(artist_id_list, None, None);
      }
    }
    k if k == app.user_config.keys.next_page => app.get_current_user_saved_artists_next(),
    k if k == app.user_config.keys.previous_page => app.get_current_user_saved_artists_previous(),
    _ => {}
  }
}