#SearchEngineReferer Get meta information from search engine`s referer for

• google.com
• bing.com
• yandex.ru
• go.mail.ru
• nova.rambler.ru

##Instalation Add the folowing line to Gemfile and then run bundle command.

gem 'search_engine_referer'

##Usage In your code use:

referer = SearchEngineReferer.parse('http://google.com?q=ruby&start=20')
referef.search_engine # => :google
referer.page # => 3
referer.query # => 'ruby'

non_search_enfine_referer = SearchEngineReferer.parse('http://example.com?q=ruby')
non_search_enfine_referef # => nil

##Middleware Tiny middleware provided. It adds search_engine_referer key to env with found referer. Examples:

• Uses HTTP_REFERER from env

  use SearchEngineReferer::Middleware

• Uses CUSTOM_ENV_KEY for referer lookup

  use SearchEngineReferer::Middleware, 'CUSTOM_ENV_KEY'

• Uses provided proc for referer lookup

  use SearchEngineReferer::Middleware do |env|
    env['action_pack.cookies']['referer']
  end

##Controller Helpers Its add helpers for controllers and views: search_engine_referer and search_engine_query. search_engine_referer_source method for referer source manipulations. By default it returns request.referer. It can be overwritten in controller, for example:

def search_engine_referer_source
  cookies[:search_engine_referer] || super
end

Note that helpers will use env['search_engine_referer'] if it provided by middleware

##Development Fully tested pull requests are welcome.