App = Webmachine::Application.new do |app|
  app.routes do
    # Will map to /orders
    add ["orders"], OrdersResource

    # Will map to /orders/:id
    # request.path_info[:id] will contain the matched token value
    add ["orders", :id], OrderResource

    # Will map to /person/:person_id/orders/:order_id and
    # provide :person_id and :order_id in request.path_info
    add ["person", :person_id, "orders", :order_id], OrderResource

    # Will map to any path starting with /orders,
    # but will not provide any path_info
    add ["orders", :*], OrderResource

    # Will map to any path that matches the given components and regular expression
    # Any capture groups specified in the regex will be made available in
    # request.path_info[:captures. In this case, you would get one or two
    # values in :captures depending on whether your request looked like:
    # /orders/1/cancel
    # or
    # /orders/1/cancel.json
    add ["orders", :id, /([^.]*)\.?(.*)?/], OrderResource

    # You can even use named captures with regular expressions. This will 
    # automatically put the captures into path_info. In the below example,
    # you would get :id from the symbol, along with :action and :format
    # from the regex. :format in this case would be optional.
    add ["orders", :id, /(?<action>)[^.]*)\.?(?<format>.*)?/], OrderResource

    # will map to any path
    add [:*], DefaultResource
  end
end

App = Webmachine::Application.new do |app|
  app.routes do
    add ["orders"], lambda { |request| request.headers['X-My-App-Version'] == "1" }, OrdersResourceV1
    add ["orders"], lambda { |request| request.headers['X-My-App-Version'] == "2" }, OrdersResourceV2
  end
end

App = Webmachine::Application.new do |app|
  app.routes do
    add ["orders"], OrdersResourceV1 do | request |
      request.headers['X-My-App-Version'] == "1"
    end
  end
end

class VersionGuard

  def initialize version
    @version = version
  end

  def call(request)
    request.headers['X-My-App-Version'] == @version
  end

end

App = Webmachine::Application.new do |app|
  app.routes do
    add ["orders"], VersionGuard.new("1"), OrdersResourceV1
    add ["orders"], VersionGuard.new("2"), OrdersResourceV2
  end
end

App = Webmachine::Application.new do |app|
  app.routes do
    add ["orders"], OrdersResource, :foo => "bar"
  end
end

request.path_info[:foo]
=> "bar"