A simple progress bar class

progress_bar.rb

class ProgressBar
  def initialize max
    @max     = max
    @current = 0.0
  end

  def draw
    progress     = @current/@max
    wipe         = "\r"
    bar_length   = 20
    progress_bar = (progress * bar_length).to_i
    bar          = "[" +  "*" * progress_bar + " " * (bar_length - progress_bar) + "]"
    count        = "[#{@current}/#{@max}]"
    percent      = "[#{(progress * 100).to_i} %]"

    print wipe, bar, count, percent
  end

  def increment! by=1
    @current += by
    @current = @max if @current > @max
    draw
  end
end