// ==UserScript==
// @name         Pop Facebook Hash Tags
// @namespace    http://www.emsquared-inc.com/
// @version      1.5.5 beta
// @description  Makes hashtag links open in a new window or tab
// @author       Eric Mintz
// @oujs:author  emsquared-inc
// @license      GNU GPL v3.0; https://github.com/emsquared-inc/PopFacebookHashTags/blob/gh-pages/LICENSE
// @homepageURL  http://www.emsquared-inc.com
// @supportURL   https://github.com/emsquared-inc/PopFacebookHashTags
// @match        https://www.facebook.com/*
// @match        https://www.facebook.com
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {

    var addListener = function(element,eventName,listener){
        if(element.addEventListener){
            element.addEventListener(eventName, listener);
        }else{
            element.attachEvent('on'+eventName, listener);
        }
    };

    var removeListener = function(element, eventName, listener){
        if(element.removeEventListener){
            element.removeEventListener(eventName, listener);
        }else{
            element.detachEvent('on'+eventName, listener);
        }
    };

    // Manage handlers
    addEventListeners = function() {
        addListener(document,'load',fixFacebookLinks);
        addListener(document,'DOMNodeInserted',fixFacebookLinks);
    };
    removeEventListeners = function() {
        removeListener(document,'load',fixFacebookLinks);
        removeListener(document,'DOMNodeInserted',fixFacebookLinks);
    };

    // Modify hashtag links
    var fixFacebookLinks = function() {

        // remove handlers to prevent recursion
        removeEventListeners();

        // find hashtag links
        var allLinks = document.getElementsByTagName('a');
        for (var i = 0; i < allLinks.length; i++) {
            if (allLinks[i].href && allLinks[i].href.contains('/hashtag/')) {

                // make the linke pop open a new brower window/tab
                allLinks[i].setAttribute('target','_blank');
            }
        }

        // restore the handlers
        setTimeout(function() {addEventListeners();},3000);
    };

    // Add listeners
    addEventListeners();
})();