Hook mechanizm for route_added [help from rtomayko]

Example:

module Sinatra
  module RouteAddedExtSample
    def self.route_added(verb, path)
      p [verb, path]
    end
  end

  register RouteAddedExtSample
end

post '/' do
  do_something
  'ok'
end

Output:

["POST", "/"]

move superclass logic into extensions attr reader

test/route_added_hook_test.rb

@@ -0,0 +1,47 @@
+require File.dirname(__FILE__) + '/helper'
+
+module RouteAddedTest
+  @routes = []
+  def self.routes ; @routes ; end
+  def self.route_added(verb, path)
+    @routes << [verb, path]
+  end
+end
+
+describe "route_added Hook" do
+
+  before { RouteAddedTest.routes.clear }
+
+  it "should be notified of an added route" do
+    mock_app(Class.new(Sinatra::Base)) {
+      register RouteAddedTest
+      get('/') {}
+    }
+
+    assert_equal [["GET", "/"], ["HEAD", "/"]],
+      RouteAddedTest.routes
+  end
+
+  it "should include hooks from superclass" do
+    a = Class.new(Class.new(Sinatra::Base))
+    b = Class.new(a)
+
+    a.register RouteAddedTest
+    b.class_eval { post("/sub_app_route") {} }
+
+    assert_equal [["POST", "/sub_app_route"]],
+      RouteAddedTest.routes
+  end
+
+  it "should only run once per extension" do
+    mock_app(Class.new(Sinatra::Base)) {
+      register RouteAddedTest
+      register RouteAddedTest
+      get('/') {}
+    }
+
+    assert_equal [["GET", "/"], ["HEAD", "/"]],
+      RouteAddedTest.routes
+  end
+
+end