Find duplicates links in OneTab - including optimisation by insectman

findDuplicatesInOnetab.js

(function findDuplicatesInOnetab() {
  const isOneTab = document
    .querySelector("title")
    ?.innerHTML.includes("OneTab"); // cheap OneTab check
  if (!isOneTab) {
    alert("Run this script in a OneTab tab");
    return;
  }

  const getOneTabLinks = () => [
    ...document.querySelectorAll("#contentAreaDiv [href]"),
  ];
  
  const getDuplicateLinks = (links) => {
    const linkMap = new Map();
    let linkList = links || getOneTabLinks();
    linkList.forEach((linkEl) => {
      const link = linkEl.getAttribute("href");
      if (!linkMap.has(link)) {
        linkMap.set(link, [linkEl]);
      } else {
        linkMap.get(link).push(linkEl);
      }
    });
    return Array.from(linkMap.values()).filter((linkEls) => linkEls.length > 1).map((le) => ({ link: le[0].getAttribute("href"), linkEls: le }));
  };

  const scrollToEl = (el) => {
    el.scrollIntoView({ behavior: "smooth", block: "center" });
  };

  const markLink = (el, text) => {
    el.style.backgroundColor = "#DE5918";
    el.style.color = "#fff";

    if (text) {
      const duplicateMarker = document.createElement("span");
      duplicateMarker.innerHTML = text;
      duplicateMarker.classList.add("duplicate-marker");
      duplicateMarker.style.marginRight = "20px";
      el.insertAdjacentElement("afterbegin", duplicateMarker);
    }
  };

  const unMarkLinks = (linkEls = getOneTabLinks()) => {
    linkEls.forEach((el) => {
      el.style.backgroundColor = undefined;
      el.style.color = undefined;

      const duplicateMarker = el.querySelector(".duplicate-marker");
      if (duplicateMarker) duplicateMarker.remove();
    });
  };

  const findDuplicates = (links) => {
    unMarkLinks(links);
    const groupedDuplicates = getDuplicateLinks(links);

    if (!groupedDuplicates.length) {
      alert("No Duplicates Found");
    } else {
      groupedDuplicates.forEach((duplicate, groupIndex) =>
        duplicate.linkEls.forEach((el, duplicateIndex) =>
          markLink(
            el,
            `${groupIndex + 1}/${groupedDuplicates.length} | ${
              duplicateIndex + 1
            }/${duplicate.linkEls.length}`
          )
        )
      );
      alert(`${groupedDuplicates.length} Duplicates Found`);
      scrollToEl(groupedDuplicates[0].linkEls[0]);
    }
  };

  findDuplicates(getOneTabLinks());
})();