title: Shortcuts with Symfony2 Twig forms : form_widget
body: <p>I would like to replace:</p>
  
  <pre><code>{{ form_errors(form.name) }}
  {{ form_widget(form.name, { 'attr': {'placeholder': 'Nom'} }) }}
  </code></pre>
  
  <p>By:</p>
  
  <pre><code>{{ form.name|field('Nom') }}
  </code></pre>
  
  <p>How could I do that? I tried to do it in a Twig extension but I don't have access to the form_widget function.</p>
  
  <p><strong>Edit</strong>: I could do it with the <code>form.name</code> properties (that include the parent form) but I would repeat symfony code, it would be a very ugly big hack</p>