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GBO / real_url_tooltip

// ==UserScript==
// @name         real_url_tooltip
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  Display the real URL location in a tooltip, allowing user to jump to this URL without any tracker triggering any anchor events. The script saves each domain name status. Default activation status is OFF. Activating is made by using shortcut "Alt+Ctrl+U".
// @author       You
// @include      *
// @require      http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js
// @grant        GM_getValue
// @grant        GM_setValue
// @copyright 2017, GBO (https://openuserjs.org/users/GBO)
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    var dn = document.location.href.replace(/https?:\/\/([^\/]+).*/gi, '$1');
    var activated = GM_getValue(dn);
    var remember;

    function initRUT() {
        // Real URL toolip
        var $rut = $('#real_url_tooltip');
        if (!$rut.length) {
            $('body').append('<span id="real_url_tooltip" style="display: block; position: absolute; z-index: 10000; border: 1px solid grey; border-radius: 5px; background-color: #FFFFE0; padding: 2px 4px; font-family: sans-serif;">...</span>');
            $rut = $('#real_url_tooltip');
            $rut.fadeOut();
            $('body').click(function() { $rut.fadeOut(); remember = ''; });
        }

        // RUT A tag management
        $('a').mouseenter(function() {
            if (activated) {
                var $self = $(this);
                if ($self.attr('href') != remember) {
                    $rut.hide();
                    remember = $self.attr('href');
                    $rut.promise().done(function() {
                        var href = $self.attr('href');
                        if (href) {
                            $rut.html('<a href="' + href + '" style="color: black;">' + href.replace(/(https?:\/\/)([^\/]+)(\/*)/i, '$1<strong>$2</strong>$3') + '</a>');
                        } else {
                            $rut.html('N/A');
                        }
                        $rut.fadeIn();
                        $rut.offset({ top: $self.offset().top + $self.height(), left: $self.offset().left });
                    });
                }
            }
        });

        // RUT Activator
        var $ruta = $('#real_url_tooltip_activator');
        if (!$ruta.length) {
            $('body').append('<a id="real_url_tooltip_activator" style="display: block; position: fixed; z-index: 10000; border: 1px solid grey; border-radius: 8px; background-color: #B0FFB0; width: 16px; height: 16px; cursor: pointer;"></a>');
            $ruta = $('#real_url_tooltip_activator');
            $ruta.offset({ top: $( window ).height() - 40, left: -10 });
            $ruta.click(function() {
                if (activated) {
                    $ruta.css('background-color', '#FFB0B0');
                    activated = false;
                } else {
                    $ruta.css('background-color', '#B0FFB0');
                    activated = true;
                }
                GM_setValue(dn, activated);
            });
            activated = !activated;
            $ruta.click();
        }

    }

    $(document).ready(function() {
        if (activated) {
            initRUT();
        } else {
            document.addEventListener ('keydown', function (zEvent) {
                if (zEvent.ctrlKey  &&  zEvent.altKey  &&  zEvent.code === 'KeyU') {
                    activated = true;
                    initRUT();
                }
            });
        }
    });
})();