title: Replace variables in jade without rendering to html
body: <p>I am using jade as a kind of markup language for a thermal printer. That means on the website i render a print preview to html, and i am sending the jade(with custom tags) directly  to the printer which interprets the tags for different text styles. 
  It works pretty well but now i would like to use also locals in that template but render only the locals not to html. </p>
  
  <p>That means </p>
  
  <pre><code>p #{name} 
  </code></pre>
  
  <p>should become </p>
  
  <pre><code>p John Doe
  </code></pre>
  
  <p>instead of </p>
  
  <pre><code>&lt;p&gt;John Doe&lt;/p&gt;
  </code></pre>
  
  <p>Is there a possibility to do this with some function in the jade package ? Or do i need to write that from scratch. I also want to use jade  "each" loop. </p>