autoreload.rb

#!/usr/bin/env ruby
#
#   autoreload
#     reload webkit whenever files in the current directory are modified
#   
#   requires:
#     * RubyCocoa (bundled with Leopard)
#     * gem install fsevents (http://github.com/ymendel/fsevents/tree/master)
#  
require 'fsevents'
require 'osx/foundation'
OSX.require_framework 'ScriptingBridge'

def reload_webkit
  # @browser = OSX::SBApplication.applicationWithBundleIdentifier_("org.apple.Safari")
  @browser = OSX::SBApplication.applicationWithBundleIdentifier_("org.webkit.nightly.WebKit")
  @browser.documents.first.URL = @browser.documents.first.URL
end

def watch_for_events
  stream = FSEvents::Stream.watch('.') do |events|
    puts "#{Time.now} MODIFIED", events.modified_files
    reload_webkit
  end
  stream.run
end

watch_for_events

gistfile2.txt