recvgrowl.rb

#!/usr/bin/ruby
require 'rubygems'
require 'ruby-growl'
require 'socket'
require 'shellwords'
require 'cgi'

UDPSocket.open do |u|
  u.bind('localhost', Growl::GROWL_UDP_PORT)
  loop do
    packet = u.readpartial(1500)
    digest = packet.slice!(-16, 16)
    next if digest != Digest::MD5.digest(packet)
    version, type, flags, *sizes = packet.unpack(Growl::GNN_FORMAT)
    next if version != Growl::GROWL_PROTOCOL_VERSION
    next if type != Growl::GROWL_TYPE_NOTIFICATION
    data = sizes.pop
    name, title, desciption, app_name = sizes.map do |size|
      data.slice!(0, size)
    end
    system Shellwords.join(['notify-send', title, CGI.escapeHTML(desciption)])
  end
end