private static async Task <int> Index(IndexOptions options)
        {
            options.Init();

            var youtubeService = await GetYouTubeService();

            Log.Logger.Information("Getting channel info for {channelId}...", options.ChannelId);
            var channel = await GetChannel(options.ChannelId, youtubeService);

            Log.Logger.Information("Getting uploaded videos for channel {channel}...", channel.Title);
            var videos = await GetVideos(channel, youtubeService);

            Log.Logger.Information("Saving index.json...");
            var destinationFile = Path.Combine(options.IndexDirectory, "index.json");

            if (File.Exists(destinationFile))
            {
                File.Delete(destinationFile);
            }

            File.WriteAllText(destinationFile, JsonConvert.SerializeObject(new YouTubeDumpChannelIndex
            {
                Channel = channel,
                Videos  = videos
            }, Formatting.Indented));

            Log.Logger.Information("Indexed!");

            return(0);
        }