require 'rubygems'
require 'autotest'
require 'sys/uname'

include Sys

##
# Autotest::FSEvent
#
# == FEATUERS:
# * Use FSEvent (on Mac OS X 10.5 or higher) instead of filesystem polling
#
# == SYNOPSIS:
# ~/.autotest
#   require 'autotest/fsevent'
module Autotest::FSEvent

  GEM_PATH = File.expand_path(File.join(File.dirname(__FILE__), '..', '..')) unless defined?(GEM_PATH)

  ##
  # Use FSEvent if possible 
  # Add waiting hook to prevent fallback to polling after ignored files have changed
  if Uname.sysname == 'Darwin' && Uname.release.to_i >= 9
    Autotest.add_hook :initialize do
      class ::Autotest
        remove_method :wait_for_changes
        def wait_for_changes
          hook :waiting
          begin
            `cd '#{Dir.pwd}'; #{File.join(GEM_PATH, 'bin', 'fsevent_sleep')} . 2>&1`
            Kernel.sleep self.sleep
          end until find_files_to_test
        end
      end
    end
  end

end