add extension that keeps track of route pattern

Gemfile.lock

@@ -66,7 +66,7 @@ GIT
 
 GIT
   remote: git://github.com/travis-ci/travis-core.git
-  revision: aecd4e464e4c18d0e77e1e44deac75e4f1054efe
+  revision: 259e48ffc68a67eff32848334025ef17ab58a3b3
   specs:
     travis-core (0.0.1)
       actionmailer (~> 3.2.11)

lib/travis/api/app/base.rb

@@ -27,7 +27,7 @@ class Travis::Api::App
       disable  :protection, :logging, :setup
       enable   :raise_errors
       # disable  :dump_errors
-      register :subclass_tracker
+      register :subclass_tracker, :expose_pattern
       helpers  :respond_with, :mime_types
     end
 

lib/travis/api/app/extensions/expose_pattern.rb

@@ -0,0 +1,12 @@
+require 'travis/api/app'
+
+class Travis::Api::App
+  module Extensions
+    module ExposePattern
+      def route(verb, path, *)
+        condition { headers('X-Endpoint' => settings.name.to_s, 'X-Pattern' => path.to_s) }
+        super
+      end
+    end
+  end
+end

spec/unit/extensions/expose_pattern_spec.rb

@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+class Foo < Sinatra::Base
+  register Travis::Api::App::Extensions::ExposePattern
+
+  get '/:id' do
+    "ok"
+  end
+end
+
+describe Travis::Api::App::Extensions::ExposePattern do
+  before { set_app(Foo) }
+
+  example "it exposes the pattern" do
+    get('/foo').should be_ok
+    headers['X-Pattern'].should be == '/:id'
+  end
+
+  example "it exposes the app class" do
+    get('/foo').should be_ok
+    headers['X-Endpoint'].should be == 'Foo'
+  end
+end