middleware reloading

sinatra-contrib/lib/sinatra/reloader.rb

@@ -194,6 +194,17 @@ module Sinatra
         Watcher::List.for(self).watch_inline_templates(file)
         super
       end
+
+      # Does everything Sinatra::Base#use does, but it also tells the
+      # +Watcher::List+ for the Sinatra application to watch the
+      # middleware beign used.
+      def use(middleware, *args, &block)
+        path = caller_files[1] || File.expand_path($0)
+        Watcher::List.for(self).watch(path, Watcher::Element.new(
+          :middleware, [middleware, args, block]
+        ))
+        super
+      end
     end
 
     # Contains the methods that the extension adds to the Sinatra
@@ -206,6 +217,8 @@ module Sinatra
           verb      = element.representation[:verb]
           signature = element.representation[:signature]
           (routes[verb] ||= []).delete(signature)
+        when :middleware then
+          @middleware.delete(element.representation)
         end
       end
 

sinatra-contrib/spec/reloader/app.rb.erb

@@ -4,6 +4,10 @@ class <%= name %> < Sinatra::Base
   enable :inline_templates
 <% end %>
 
+<% middlewares.each do |middleware| %>
+  use <%= middleware %>
+<% end %>
+
 <% routes.each do |route| %>
   <%= route %>
 <% end %>

sinatra-contrib/spec/reloader_spec.rb

@@ -40,6 +40,7 @@ describe Sinatra::Reloader do
   def write_app_file(options={})
     options[:routes] ||= ['get("/foo") { erb :foo }']
     options[:inline_templates] ||= nil
+    options[:middlewares] ||= []
     options[:name] ||= app_name
 
     update_file(app_file_path) do |f|
@@ -148,6 +149,28 @@ describe Sinatra::Reloader do
     end
   end
 
+  describe "default middleware reloading mechanism" do
+    it "knows when a middleware has been added" do
+      setup_example_app(:routes => ['get("/foo") { "foo" }'])
+      update_app_file(
+        :routes => ['get("/foo") { "foo" }'],
+        :middlewares => [Rack::Head]
+      )
+      get('/foo') # ...to perform the reload
+      app_const.middleware.should_not be_empty
+    end
+
+    it "knows when a middleware has been removed" do
+      setup_example_app(
+        :routes => ['get("/foo") { "foo" }'],
+        :middlewares => [Rack::Head]
+      )
+      update_app_file(:routes => ['get("/foo") { "foo" }'])
+      get('/foo') # ...to perform the reload
+      app_const.middleware.should be_empty
+    end
+  end
+
   describe ".dont_reload" do
     before(:each) do
       setup_example_app(