getting and setting prefs from a plist in macruby

prefs.rb

#!/usr/local/bin/macruby
# nb. http://stackoverflow.com/questions/8738424/macruby-how-to-create-an-app-that-can-be-configured-from-the-outside

framework 'Cocoa'
framework 'Foundation'


def set_prefs(pref)
  if File.exists?(pref)
    @config = load_plist File.read(pref)
    plist = {}
    plist["version"] = "0.4"
    plist["url"] = "http://google.com"
    plist["menuicon"] = "blue.png"
    plist["abouticon"] = "logo.png"
    #plist["date"] = NSDate.date
    unless @config.isEqualToDictionary(plist)
      plist.writeToFile(pref, :atomically => true)
    end
  end
end

def get_prefs(pref)
  @config = load_plist File.read(pref)
end

def get_key(plist,key)
  plist[key]
end

pref = "/tmp/com.rockpapergoat.menu.plist"
set_prefs(pref)

puts get_key(get_prefs(pref),"version")