// jQuery plugin for setting the class of a particular element to "current" based on the current page.
// Useful for navigation menus that are part of a server side include for the whole site.
//
// By Rob Watts, http://tractionsys.com
// Version 1.2, April 25, 2011
// Provided under the MIT license. Feel free to use it however you like.
//
// Example:
// $("ul.nav a").currentPage();
//
// To override defaults, pass in a defaults object:
// $("ul.nav a").currentPage({
//    attr: "href",
//    defaultClass: "selected",
//    indexPage: ""
// });

function getPage() {
  var href = window.location.href;
  var host = window.location.host;
  var pos = href.indexOf(host);
  var url = href.substring(pos + host.length);


  if ( url.charAt(0) == "/" )
    url = url.substring(1, url.length);

  return url;
}


jQuery.fn.currentPage = function(options) {
    var currentPage = "";
    var thisClass = "";
    var thisHref = "";
    var settings = jQuery.extend({
        defaultClass: "selected",       // Default class to add to current link
        attr: "href",              // Default attribute to compare with current page URL (not usually used)
        appendToFirstClass: false, // Append the defaultClass to the first class on the element.
        // E.g. class="monkey" becomes class="monkey monkeycurrent"
        indexPage: "/",            // Default index page (to make current when page is not shown in URL)
        anyPath: true             // Ignore the path (supports pages in subfolders, and triggers on filename alone)
    }, options);

    currentPage = getPage();
    if ((currentPage == "") || (settings.anyPath && (currentPage.indexOf("/") == currentPage.length - 1)))
        currentPage = settings.indexPage;

    this.each(function() {
        thisHref = $(this).attr(settings.attr);
        if ((thisHref == currentPage) || (settings.anyPath && ((thisHref.indexOf(currentPage) > -1) && (thisHref.indexOf(currentPage) + currentPage.length == thisHref.length)))) {
            if (settings.appendToFirstClass) {
                thisClass = $(this).attr("class").split(" ")[0];  // Choose the first class (if multiple classes defined)
                thisClass = thisClass + settings.defaultClass;    // Append the default current class to the first class class
            }
            else
                thisClass = settings.defaultClass;

            $(this).addClass(thisClass);
        }
    });
};