growl_server.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'sinatra/base'
require 'ruby-growl'
require 'launchy'

class GrowlServer < Sinatra::Base
  set :port, 5678

  def initialize(app = nil, &block)
    super(app, &block)

    @name = 'growl server'
    @growl = Growl::GNTP.new('localhost', @name, [$0])
    @growl.register
  end

  get '/' do
    text = params[:text]
    url = params[:url]

    if text
      notify(text, url)
    end

    'ok'
  end

  def notify(text, url)
    @growl.notify($0, @name, text, 0, false, nil, nil) do |res|
      if url && res['Notification-Callback-Result'] == 'CLICKED'
        Launchy.open(url)
      end
    end
  end

  run! if app_file == $0
end