chef-log-profile.rb

#!/usr/bin/env ruby
require 'date'

prev_dt = nil
prev_line = nil
$stdin.each_line do |line|
  time_str = line[1..25]
  dt = DateTime.parse(time_str) rescue next

  if prev_dt != nil
    #p '---'
    #p prev_dt
    #p dt
    #p line
    secs = ((dt - prev_dt) * 24 * 60 * 60).to_i
    if (secs  > 0)
      puts "(#{secs.to_s.rjust(10, '0')}s) #{line}"
    end
  end

  prev_dt = dt
  prev_line = line
end