Wrap coffeescript in a closure

latte_script.rb

require 'coffee-script'

code = DATA.read
magic_code = <<_EOJS_
_magic_code = ($) ->
  #{code}
_magic_code(jQuery);
_EOJS_
puts CoffeeScript.compile magic_code
__END__
$ -> alert "hi from coffee script town"

(function() {
  var _magic_code;

  _magic_code = function($) {
    return $(function() {
      return alert("hi from coffee script town");
    });
  };

  _magic_code(jQuery);

}).call(this);