Some HB handlers which extend template functions.

hb-includes.js

/* assume you have a HB template compiled called 'question_btn'
   which contains {{outlet}} within it as optional embedded content

# example of question_btn.hbs

<a target="_blank" href="{{question_url}}">
  <button type="button" class="pull-right btn question" title="ask seller a question">
    {{#if outlet}}{{outlet}}{{else}}<i class="icon-question-sign"></i>{{/if}}
  </button>
</a>

// Usage
{{include 'question_btn' this}}

{{#layout 'question_btn' this}}
  <i class="icon-user"></i>
{{/layout}}

*/

/* you can change this to lazy-load/recompile your templates if you are in DEVELOPMENT mode,
   assumes you are pre-compiling these templates in PRODUCTION mode */
var build_template = function(template_name, context) {
  return new Handlebars.SafeString(HandlebarsTemplates[template_name](context));
};

// includes a snippet without any embedded content
Handlebars.registerHelper('include', function(template_name, context) {
  return build_template(template_name, context);
});

// like include but as a block helper, you can pass HTML within the templates {{outlet}}
Handlebars.registerHelper('layout', function (template_name, context, options) {
  context = _.extend({outlet: new Handlebars.SafeString(options.fn(this))}, options);
  return build_template(template_name, context);
});