A progress column for Spectre.Console that shows download progress

DownloadedColumn.cs

    /// <summary>
    /// A column showing download progress.
    /// </summary>
    public sealed class DownloadedColumn : ProgressColumn
    {
        private static readonly string[] _suffixes = new[] { "B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
        private static readonly int _base = 1024;

        /// <summary>
        /// Gets or sets the <see cref="CultureInfo"/> to use.
        /// </summary>
        public CultureInfo? Culture { get; set; }

        /// <inheritdoc/>
        public override IRenderable Render(RenderContext context, ProgressTask task, TimeSpan deltaTime)
        {
            var (unit, suffix, precision) = GetUnitAndSuffix(task.MaxValue);

            var completed = Format(task.Value / unit, precision);
            var totalString = Format(task.MaxValue / unit, precision);

            return new Text($"{completed}/{totalString} {suffix}");
        }

        private string Format(double value, int precision)
        {
            return precision == 0
                ? ((int)value).ToString(Culture ?? CultureInfo.CurrentCulture)
                : value.ToString("0.#", Culture ?? CultureInfo.CurrentCulture);
        }

        private (double Unit, string Suffix, int Precision) GetUnitAndSuffix(double size)
        {
            var unit = 0D;
            var suffix = string.Empty;
            var precision = 0;

            for (var index = 0; index < _suffixes.Length; index++)
            {
                unit = Math.Pow(_base, index);
                if (size < (unit * _base))
                {
                    suffix = _suffixes[index];
                    precision = index == 0 ? 0 : 1;
                    break;
                }
            }

            if (string.IsNullOrWhiteSpace(suffix))
            {
                suffix = _suffixes[0];
                precision = 0;
            }

            return (unit, suffix, precision);
        }
    }