github_status_hipchat_notify.rb

#!/usr/bin/env ruby

require 'httparty'
require 'hipchat'
require 'yaml'

LAST_MESSAGE_FILE = 'tmp/last_github_status.yml'
HIPCHAT_API_KEY = 'secret'
HIPCHAT_ROOM = 'Notifications'

class GithubStatus
  include HTTParty
  base_uri 'https://status.github.com/api'

  def current_status
    self.class.get('/status.json')
  end

  def last_message
    self.class.get('/last-message.json')
  end

  def messages
    self.class.get('/messages.json')
  end
end

hipchat_client  = HipChat::Client.new(HIPCHAT_API_KEY)
github_client   = GithubStatus.new
last_message    = YAML.load(File.read(LAST_MESSAGE_FILE))
current_message = github_client.last_message

should_notify   = last_message['created_on'] != current_message['created_on'] &&
                  (current_message['status'] != 'good' || last_message['status'] != 'good')

if should_notify
  message = current_message['body']

  color = case current_message['status']
    when 'good': 'green'
    when 'minor': 'yellow'
    when 'major': 'red'
  end

  hipchat_client[HIPCHAT_ROOM].send('GitHub Status', message, :color => color)
end

File.open(LAST_MESSAGE_FILE, 'w') do |message_file|
  message_file.write(current_message.to_yaml)
end