class Rufus::CronLine

def next_time (now = Time.now)
  #
  # position now to the next cron second
  if @seconds
    next_sec = @seconds.find { |s| s > now.sec } || 60 + @seconds.first
    now += next_sec - now.sec
  else
    now += 1
  end
  #
  # prepare sec jump array
  sjarray = nil
  if @seconds
    sjarray = []
    i = @seconds.index(now.sec)
    ii = i
    loop do
      cur = @seconds[ii]
      ii += 1
      ii = 0 if ii == @seconds.size
      nxt = @seconds[ii]
      nxt += 60 if ii == 0
      sjarray << (nxt - cur)
      break if ii == i
    end
  else
    sjarray = [ 1 ]
  end
  #
  # ok, seek...
  i = 0
  loop do
    return now if matches?(now)
    now += sjarray[i]
    i += 1
    i = 0 if i == sjarray.size
    # danger... potentially no exit...
  end
  nil
end