A simple ruby program for measuring time duration.

simple_stop_watch.rb

#!/usr/bin/env ruby

class SimpleStopWatch
  def initialize()
    @base = Time.now
    @pausing = false
    @pausing_secs = 0
    @min = 0
    @sec = 0
    @rem = 0
  end

  def start()
    @base = Time.now
    @pausing = false
    @pausing_secs = 0
    @min = 0
    @sec = 0
    @rem = 0
  end

  def pause()
    unless @pausing
      update()
      @pause_time = Time.now
      @pausing = true
    end
  end

  def resume()
    if @pausing
      @resume_time = Time.now
      @pausing_secs += @resume_time - @pause_time
      @pausing = false
    end
  end

  def update()
    unless @pausing
      cur = Time.now
      diff = ((cur - @base - @pausing_secs) * 100).to_i
      @min = (diff / (60 * 100))
      @sec = (diff % (60 * 100)) / 100
      @rem = (diff % (60 * 100)) % 100
    end
  end

  def to_s()
    "%.2d:%.2d.%.2d" % [@min, @sec, @rem]
  end
end

i=0
ssw = SimpleStopWatch.new()
print ("%4d %s" % [i, ssw.to_s])
i+=1

while (l = STDIN.readline)
  case l[0,1]
    when "q" then exit(0)
    when "p" then ssw.pause()
    when "r" then ssw.resume()
    when "s" then ssw.start()
    else ssw.update()
  end
  print ("%4d %s" % [i, ssw.to_s])
  i+=1
end