define(function (require) {

var handlebars = require("handlebars");

handlebars.loadPartial = function loadPartial(name) {

var partial = handlebars.partials[name];

if (typeof partial === "string") {

partial = handlebars.compile(partial);

handlebars.partials[name] = partial;

}

return partial;

};

handlebars.registerHelper("ifNotEmpty", function ifNotEmpty(options) {

var content = options.inverse(this);

if (content.trim() === "") {

content = "";

} else {

handlebars.registerPartial("$content", content);

content = options.fn(this);

}

return content;

});

handlebars.registerHelper("join", function join(list, sep, options) {

return list.map(options.fn).join(sep);

});

handlebars.registerHelper("ul", function ul(list, options) {

if (!list || list.length === 0) return "";

return "<ul>\n" + list.map(function (item) {

return "<li>" + options.fn(item) + "</li>";

}).join("\n") + "\n</ul>";

});

handlebars.registerHelper("partial", function partial(name, options) {

handlebars.registerPartial(name, options.fn);

});

handlebars.registerHelper("block", function block(name, options) {

/* Look for partial by name. */

var partial = handlebars.loadPartial(name) || options.fn;

return partial(this, { data : options.hash });

});

});