Twitter bootstrap tab's jQuery plugin to show hash in location string (custom prefix prevent page jumps to links containing hash), keep current tab on page reload and react on hash change event

bootstrap_prefix_tab.js

/*
Usage:

    $(document).ready(function() {
        $('#tabs').prefix_tab({
            prefix: 'settings_',
            default_route: 'general'
        });
    });

*/
;(function($) {
    $.fn.extend({
        prefix_tab : function(custom_options) {

            var defaults,
                options,
                show_tab,
                initialize;

            defaults = {
                sep: '/',
                prefix: "tab_",
                default_route: null
            };

            options = $.extend(defaults, custom_options);

            show_tab = function(tabs) {
                var hash = document.location.hash;
                if (hash) {
                    tabs.find('a[href='+hash.replace(options.sep + options.prefix,"")+']').tab('show');
                } else {
                    if (options.default_route) {
                        window.location.hash = options.sep + options.prefix + options.default_route;
                    }
                }
            };

            initialize = function(tabs) {
                show_tab(tabs);

                tabs.on('shown', 'a', function (e) {
                    window.location.hash = e.target.hash.replace("#", "#" + options.sep + options.prefix);
                });

                if ("onhashchange" in window) {
                    var hash_changed = function() {
                        show_tab(tabs);
                    };
                    window.onhashchange = hash_changed;
                }
            };

            return $(this).each(function(){
                var tabs = $(this);
                initialize(tabs);
            });
        }
    })
})(jQuery);