Send a message to Mac OSX notification center.

notify.rb

def changed(file_path)
  notify File.open(file_path, "rb").read
end

def notify(result)
  messages = result.split("\n")
  title = messages.shift
  group = messages.shift
  info = messages.join("\n")

  require 'rubygems'
  require 'terminal-notifier'
  TerminalNotifier.notify(info, :title => title, :group => group)
end

changed(ARGV[0])