How do you tell Jade to keep code format when compiling

I am using Jade with nodejs and express. When I call res.render on my jade code, it converts it to html. However, the html has no line breaks. Can I tell jade to preserve code formatting?

express 2.x

app.set('view options', { pretty: true });

express 3.x

app.locals.pretty = true;

Scroll down to "View Options" in this wiki page.

Also see this answer.