timer

#!/usr/bin/env ruby -w

# timer continuation function
def make_timer
  start_time = Time.now.to_f
  lambda { Time.now.to_f - start_time }
end

def duration(string)
  begin
    if string =~ /:/
      parts = string.split(':').map{|s| s.to_f.round(2)}.reverse
      factors = [1, 60, 60 * 60, 60 * 60 * 24]
      seconds = 0

      while parts.size > 0 && factors.size > 0
        seconds += parts.shift * factors.shift
      end

      seconds
    else
      string.to_f.round(2)
    end
  rescue
    0
  end
end

if ARGV[0]
  total_time = duration(ARGV[0])
  direction = :down
  puts "Counting down from #{total_time} seconds..."
else
  direction = :up
  puts "Couting up..."
end


timer = make_timer

begin
  sleep 0.01

  elapsed = timer.call.round(2)

  if direction == :up
    reporting = elapsed
  else
    reporting = total_time - elapsed
  end

  seconds = reporting.truncate
  subseconds = ((reporting - seconds.to_f) * 100.0).truncate
  minutes = 0
  hours   = 0

  if seconds >= 60
    minutes = (seconds / 60).truncate
    seconds %= 60
  end

  if minutes >= 60
    hours = (minutes / 60).truncate
    minutes %= 60
  end

  print "    \r%02d:%02d:%02d.%02d (%0.2fs)" %
    [hours, minutes, seconds, subseconds, reporting]
end while direction == :up or elapsed < total_time

puts ""
puts "Done!"