module Console

# File lib/tumblr/console.rb, line 8
def draw_process_bar(now = 0, total = 1)
  if now < 0 || total <= 0 || (now > total)
    raise "wrong arguments: now => #{now}, total => #{total}"
  end
  rows, cols = IO.console.winsize
  percent = (now * 100.0 / total).round
  header = "#{"% 4d" % percent}% ["
  cols = cols - header.length - 2
  len = (cols / 100.0 * percent).round
  body = if len.zero?
     "#{" " * (cols - len)}] "
  else
    "#{"=" * (len - 1)}#{percent < 100 ? '>' : '='}#{" " * (cols - len)}] "
  end
  print "\r"
  print header + body
  print "\n" if now >= total
end