1 files changed, 24 insertions, 0 deletions
diff --git a/railties/lib/rails/rack/debugger.rb b/railties/lib/rails/rack/debugger.rb
new file mode 100644
index 0000000000..f7b77bcb3b
--- /dev/null
+++ b/railties/lib/rails/rack/debugger.rb
@@ -0,0 +1,24 @@
+module Rails
+  module Rack
+    class Debugger
+      def initialize(app)
+        @app = app
+
+        ARGV.clear # clear ARGV so that rails server options aren't passed to IRB
+
+        require 'debugger'
+
+        ::Debugger.start
+        ::Debugger.settings[:autoeval] = true if ::Debugger.respond_to?(:settings)
+        puts "=> Debugger enabled"
+      rescue LoadError
+        puts "You're missing the 'debugger' gem. Add it to your Gemfile, bundle it and try again."
+        exit(1)
+      end
+
+      def call(env)
+        @app.call(env)
+      end
+    end
+  end
+end