add vwo handler

README.md

@@ -126,8 +126,16 @@ Will result in the following:
 ```javascript
   window._fbq.push(["track", "123456789", {'value': 1, 'currency': 'EUR'}]);
 ```
+### Visual website Optimizer (VWO)
+Just integrate the handler with your matching account_id and you will be ready to go
 
-#### Custom Handlers
+```ruby
+  use Rack::Tracker do
+    handler :vwo, { account_id: 'YOUR_ACCOUNT_ID' }
+  end
+```
+
+### Custom Handlers
 
 Tough we give you Google Analytics and Facebook right out of the box, you might
 be interested adding support for your custom tracking/analytics service.

lib/rack/tracker.rb

@@ -12,6 +12,7 @@
 require "rack/tracker/controller"
 require "rack/tracker/google_analytics/google_analytics"
 require "rack/tracker/facebook/facebook"
+require "rack/tracker/vwo/vwo"
 
 module Rack
   class Tracker

lib/rack/tracker/vwo/template/vwo.erb

@@ -0,0 +1,10 @@
+<!-- Start Visual Website Optimizer Asynchronous Code -->
+<script type='text/javascript'>
+var _vwo_code=(function(){
+settings_tolerance=2000,
+library_tolerance=2500,
+use_existing_jquery=false,
+// DO NOT EDIT BELOW THIS LINE
+f=false,d=document;return{use_existing_jquery:function(){return use_existing_jquery;},library_tolerance:function(){return library_tolerance;},finish:function(){if(!f){f=true;var a=d.getElementById('_vis_opt_path_hides');if(a)a.parentNode.removeChild(a);}},finished:function(){return f;},load:function(a){var b=d.createElement('script');b.src=a;b.type='text/javascript';b.innerText;b.onerror=function(){_vwo_code.finish();};d.getElementsByTagName('head')[0].appendChild(b);},init:function(){settings_timer=setTimeout('_vwo_code.finish()',settings_tolerance);this.load('//dev.visualwebsiteoptimizer.com/j.php?a='+ '<%= options[:account_id] %>' + '&u='+encodeURIComponent(d.URL)+'&r='+Math.random());var a=d.createElement('style'),b='body{opacity:0 !important;filter:alpha(opacity=0) !important;background:none !important;}',h=d.getElementsByTagName('head')[0];a.setAttribute('id','_vis_opt_path_hides');a.setAttribute('type','text/css');if(a.styleSheet)a.styleSheet.cssText=b;else a.appendChild(d.createTextNode(b));h.appendChild(a);return settings_timer;}};}());_vwo_settings_timer=_vwo_code.init();
+</script>
+<!-- End Visual Website Optimizer Asynchronous Code -->

lib/rack/tracker/vwo/vwo.rb

@@ -0,0 +1,5 @@
+class Vwo <  Rack::Tracker::Handler
+  def render
+    Tilt.new( File.join( File.dirname(__FILE__), 'template', 'vwo.erb') ).render(self)
+  end
+end

spec/handler/vwo_spec.rb

@@ -0,0 +1,12 @@
+RSpec.describe Rack::Tracker::Vwo do
+
+  def env
+    {misc: 'foobar'}
+  end
+
+  it 'will be placed in the head' do
+    expect(described_class.position).to eq(:head)
+    expect(described_class.new(env).position).to eq(:head)
+  end
+
+end

spec/integration/vwo_integration_spec.rb

@@ -0,0 +1,21 @@
+require 'support/metal_controller'
+require 'support/fake_handler'
+
+RSpec.describe "VWO Integration" do
+  before do
+    Capybara.app = Rack::Builder.new do
+      use Rack::Tracker do
+        handler :vwo, { account_id: '123456' }
+      end
+      run MetalController.action(:vwo)
+    end
+
+    visit '/'
+  end
+
+  subject { page }
+
+  it "embeds the script tag" do
+    expect(page).to have_content("this.load('//dev.visualwebsiteoptimizer.com/j.php?a='+ '123456'")
+  end
+end

spec/support/metal_controller.rb

@@ -29,4 +29,8 @@ def google_analytics
     end
     render "metal/index"
   end
+
+  def vwo
+    render "metal/index"
+  end
 end