ConsoleProgressBar

ConsoleProgressBar.cs

class ProgressBar
{
    private const char Start = '[';
    private const char End = ']';
    private const char InProgress = '>';
    private const char Done = '-';

    private readonly int totalSize;
    private readonly int progressLength;
    private readonly int chunkSize;
    private readonly ConsoleColor color;
    private readonly DateTime started;

    public ProgressBar(int totalSize, int progressLength, ConsoleColor color)
    {
        this.color = color;
        this.totalSize = totalSize;
        this.progressLength = progressLength;

        chunkSize = totalSize / progressLength;
        started = DateTime.UtcNow;

        var whitespace = string.Join("", Enumerable.Range(0, progressLength).Select(_ => " "));
        Colour(() => Console.Write("{0}{1}{2}", Start, whitespace, End));
        var progressNumbers = string.Format(" {0} of {1} {2}%", 0, totalSize, 0);
        Colour(() => Console.Write(progressNumbers), ConsoleColor.Green);
    }

    public void UpdateProgress(int pos)
    {
        Colour(() =>
        {
            // progress bar
            Console.SetCursorPosition(1, Console.CursorTop);
            var arrow = new string(Enumerable.Range(0, pos/chunkSize).Select(_ => Done).ToArray());
            Console.Write("{0}{1}", arrow, InProgress);
        });

        Colour(() =>
        {
            // progress numbers
            Console.SetCursorPosition(progressLength + 3, Console.CursorTop);
            double perc = Math.Round((pos / (double) totalSize) * 100, 2);
            string remaining = "";
            if (pos > 0)
            {
                var perEvent = (DateTime.UtcNow - started).Ticks / pos;
                var timeleft = TimeSpan.FromTicks((totalSize - pos) * perEvent);
                remaining = string.Format("{0} remaining", timeleft.ToString(@"hh\:mm\:ss"));
            }
            Console.Write(" {0} of {1} {2}% {3}", pos, totalSize, perc, remaining);
        }, ConsoleColor.Green);
    }

    private void Colour(Action print)
    {
        Colour(print, color);
    }

    private void Colour(Action print, ConsoleColor consoleColor)
    {
        Console.ForegroundColor = consoleColor;
        print();
        Console.ForegroundColor = ConsoleColor.White;
    }
}