domain problem based javascript, css and html

_widget.erb

<% widget_coffee :my_widget do %>
  ... some coffeescript excluding closure wrapping
  ... this content gets compiled into application.js once.
<% end %>

<% widget_sass :my_widget do %>
  ... namespaced styling for my_widget
  ... this gets compiled into application.css once.
<% end %>

<div class='widget'>
  ... html for my_widget, appears like a standard rails partial and is widgetized by the code above.
</div>

the problem domain is 'my_widget', my widget does something simple, but having the code in three separate areas in the source directory is clumsy, so including all the code for the widget in one place makes it simple until in grows (once that happens you can put the related code in the same directory)