UserScript for rewriting pkg.go.dev links to always use sourcegraph.com

pkg-go-dev-sourcegraph.js

// ==UserScript==
// @name         pkg.go.dev links to sourcegraph
// @namespace    https://jorgelbg.me/
// @version      0.1
// @description  Translate all the cs.opensource.google and github.com links to sourcegraph.com on pkg.go.dev.
// @author       Jorge Luis Betancourt <github@jorgelbg.me>
// @match        https://pkg.go.dev/*
// @icon         https://sourcegraph.com/.assets/img/sourcegraph-mark.svg
// @require      https://openuserjs.org/src/libs/sizzle/GM_config.js
// @grant        GM_getValue
// @grant        GM_setValue
// ==/UserScript==

(function () {
  "use strict";

  let sourcegraphLink =
    "https://sourcegraph.com/github.com/$__repo@$__tag/-/blob/$__path?L$__line";
  let googleRegex = new RegExp(
    /cs\.opensource\.google.*\/(?<tag>go.*):(?<path>.*);l=(?<line>\d+)$/i
  );
  let githubRegex = new RegExp(
    /github\.com\/(?<repo>.*)\/blob\/(?<tag>v[\w,\-,\_,\d,\.]+)\/(?<path>.*)#L(?<line>\d+)$/i
  );

  // iterate over links and add template
  let pageLinks = Array.from(document.links);
  let replaced = 0;
  for (let i = 0; i < pageLinks.length; i++) {
    const match =
      googleRegex.exec(pageLinks[i].href) ||
      githubRegex.exec(pageLinks[i].href);

    if (match) {
      let { groups } = match;
      let replacements = {
        $__tag: groups["tag"],
        $__path: groups["path"],
        $__line: groups["line"],
        $__repo: groups["repo"] || "golang/go",
      };

      replaced++;

      pageLinks[i].href = sourcegraphLink.replace(
        /\$__(tag|path|line|repo)/gi,
        function (matched) {
          return replacements[matched];
        }
      );
    }
  }

  if (replaced > 0) {
    console.log(`✅ done! changed ${replaced} links to sourcegraph.com`);
  }
})();