Writing a helper that produces bound results?

Question

I have a date/time formatting helper but what it produces does not update when the underlying property changes. This is not a surprise, but does anyone know how to produce

Answer 1

It is now possible to create bound Handlebars helpers using a public Ember API.

Handlebars.registerBoundHelper('timestamp', function(date, options) {
  var formatter        = options.hash['format'] ? options.hash['format'] : 'hh:mm a MM-DD-YYYY';
  var parsed_date      = moment(date);
  var formatted_date   = parsed_date.format(formatter);

  return new Handlebars.SafeString("" + formatted_date + "");
});

The parameter passed to the helper will have already been resolved, and the helper will be called again whenever the path changes.