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Add Site Search Links To Google Search Result

Add a "Site Results" link onto each Google search result entries to search from that site. The link will be added either in the search result entry's popup menu, or after the green URL below the entry's title.

Versión del día 01/10/2020. Echa un vistazo a la versión más reciente.

// ==UserScript==
// @name         Add Site Search Links To Google Search Result
// @namespace    https://greasyfork.runtimutd.eu.org/en/users/85671-jcunews
// @version      1.0.7
// @license      AGPL v3
// @author       jcunews
// @description  Add a "Site Results" link onto each Google search result entries to search from that site. The link will be added either in the search result entry's popup menu, or after the green URL below the entry's title.
// @include      *://www.google.*/search*
// @include      *://www.google.*.*/search*
// @grant        none
// ==/UserScript==

(function(a) {
  function dropdownClick(a) {
    this.setAttribute("aria-expanded", a = this.classList.toggle("selected"));
    this.parentNode.querySelector(".action-menu-panel").style.visibility = a ? "inherit" : "";
  }
  location.search.substring(1).split("&").some(function(v) {
    if (v.indexOf("q=") === 0) {
      if (a = decodeURIComponent(v.substr(2).trim().replace(/\+/g, " ")).match(/(?:^|\s)site:([^\s]+)/)) {
        a = a[1];
      } else a = "";
      return true;
    }
  });
  if (!a) document.querySelectorAll("#ires .g,#search .g").forEach(function(entry, menu, point, e) {
    if (!(point = entry.querySelector(".r>a,.yuRUbf>a"))) return;
    if (menu = entry.querySelector(".action-menu-item")) { //v2: has menu
      if ((/:\/\/webcache/).test(menu.firstElementChild.href)) {
        e = menu.nextElementSibling;
      } else if ((/=related:http/).test(menu.firstElementChild.href)) {
        e = menu;
      } else e = null;
      menu = menu.parentNode.insertBefore(menu.cloneNode(true), e).firstElementChild;
    } else if (menu = entry.querySelector(".f")) { //v1
      menu.insertAdjacentHTML("beforeend", ' - <a class="fl"></a>');
      menu = menu.lastElementChild;
    } else { //v2: no menu
      point.parentNode.insertBefore(menu = document.createElement("SPAN"), point.nextSibling);
      menu.innerHTML = `\
<div class="action-menu ac_ctl">
  <a class="GHDvEf ab_button" href="#" aria-label="Result Options" aria-expanded="false" aria-haspopup="true" role="button" jsaction="m.tdd;keydown:m.hbke;keypress:m.mskpe"><span class="mn-dwn-arw"></span></a>
  <div class="action-menu-panel ab_dropdown" role="menu" tabindex="-1" jsaction="keydown:m.hdke;mouseover:m.hdhne;mouseout:m.hdhue">
    <ol><li class="action-menu-item ab_dropdownitem" role="menuitem"><a class="fl"></a></li></ol>
  </div>
</div>`;
      menu.querySelector("a").onclick = dropdownClick;
      menu = menu.querySelector(".fl");
    }
    menu.textContent = "Site Results";
    if (point.pathname === "/url") {
      point = unescape(point.search.match(/&url=([^&]+)/)[1]).match(/:\/\/([^:/]+)/)[1];
    } else point = point.hostname;
    menu.href = location.href.replace(/([&?]q=[^&]+)/, "$1+site:" + escape(point));
    menu.onmousedown = null;
  });
})();