http-interceptor to add the location of a directives template.

template-identifier.js

app.config(function($provide, $httpProvider) {
    labelDirectiveTemplates();
})

function labelDirectiveTemplates() {
    $provide.decorator('$templateCache', function($delegate) {
        var get = $delegate.get;

        $delegate.get = decorateTemplateWithComment;
        return $delegate;

        function decorateTemplateWithComment(key) {
            var value = get.call($delegate, key);
            console.log('template::', key, value);
            return addComment(key, value);
        }
    });

    $httpProvider.interceptors.push(function($q) {
        return {
            'response': function(response) {
                var url = response.config.url;
                var isTemplate = url.indexOf('.html') > -1;
                if (isTemplate) {
                    response.data = addComment(url, response.data);
                }

                return $q.when(response);
            }
        };
    });

    function addComment(url, template) {
        if (!template)
            return undefined;

        if (angular.isArray(template))
            template = template[1];

        var commentBegin = '<!-- TEMPLATE-LOCATION: "';
        var commentEnd = '" -->\n';
        var comment = commentBegin + url + commentEnd;

        if (template.indexOf(commentBegin) == -1)
            return comment + template;
        return template;
    }
}