public static async Task SaveLyrics(this Audio audio, int i, VkApi vkApi, FilesystemTools filesystemTools, DirectoryInfo dir, CancellationToken token, ILog log)
{
if (audio.LyricsId != null)
{
var filename = $"{i} {audio.GetName()}.txt";
await filesystemTools.WriteFileWithCompletionMark(dir, filename, async() =>
{
var lyrics = await vkApi.Audio.GetLyricsAsync(audio.LyricsId.Value);
return(lyrics.Text);
}, token, log);
}
}