module Middleman::Sitemap

def registered(app)

  app.register Middleman::Sitemap::Extensions::Proxies
  app.register Middleman::Sitemap::Extensions::Ignores

  # Setup callbacks which can exclude paths from the sitemap
  app.set :ignored_sitemap_matchers, {
    # dotfiles and folders in the root
    :root_dotfiles => proc { |file, path| file.match(/^\./) },
  
    # Files starting with an dot, but not .htaccess
    :source_dotfiles => proc { |file, path| 
      (file.match(/\/\./) && !file.match(/\/\.htaccess/)) 
    },
  
    # Files starting with an underscore, but not a double-underscore
    :partials => proc { |file, path| (file.match(/\/_/) && !file.match(/\/__/)) },
  
    :layout => proc { |file, path| 
      file.match(/^source\/layout\./) || file.match(/^source\/layouts\//)
    },
  
    # Files without any output extension (layouts, partials)
    # :extensionless => proc { |file, path| !path.match(/\./) },
  }

  # Include instance methods
  app.send :include, InstanceMethods

  # Initialize Sitemap
  app.before_configuration do
    sitemap
  end
end