Show require calls with timing

require_timings.rb

require 'benchmark'
$require_level = 0
module Kernel
  alias require_without_timing require

  def require(path)
    result = seconds = nil
    
    begin
      $require_level += 1 
      seconds = Benchmark.realtime { result = require_without_timing(path) }
    ensure
      $require_level -= 1 
    end

    puts "#{'%.5f' % seconds} #{' '*$require_level}#{path}" if result
    result
  end
end