Github BMO Linker GreaseMonkey script

GitHub BMO Linker.js

// ==UserScript==
// @name     GitHub BMO Linker
// @version  3
// @author   Olivier Mehani <[email protected]>
// @downloadURL https://gist.github.com/shtrom/e9c25e103aaf2f8ede6f740787b50e33
// @grant    none
// @match    https://github.com/*
// @run-at   document-idle
// ==/UserScript==

const baseUrl = "https://bugzilla.mozilla.org/show_bug.cgi?id=";
const bugRE = /bug ([0-9]+)/i;

const logName = "GreaseMonkey GBL"; 
let debugLog = function() {} ;
//debugLog = console.debug;

let count = 0;
const skippableTags = [
  //"A",
  "IMG",
  "INPUT",
  "OBJECT",
  "PRE"
];

function linkifyBugs(s) {
  return s.replace(bugRE, '<a href="' + baseUrl + '$1">$&</a>');
}
function bugUrl(s) {
  return s.replace(bugRE, baseUrl + '$1');
}

function recursiveLinkifyBugs(el) {


  if (el.childNodes === undefined) {
    //debugLog(logName + ": no child nodes in", el);
    return;
  }
  
  let i = el.childNodes.length;

  while (n = el.childNodes[--i]) {    
    //debugLog(logName + ": processing node", i, n, "from", el);
    if (n.nodeType == n.TEXT_NODE) {
      // https://stackoverflow.com/a/12212700
      while (r = bugRE.exec(n.textContent)) {
        debugLog(logName + ": found bug string in", n, "from", el);
        n = n.splitText(r.index);
        n = n.splitText(r[0].length);
        linkTextNode = n.previousSibling;
        linkNode = document.createElement('a');
        linkNode.href = bugUrl(linkTextNode.textContent);
        linkNode.appendChild(linkTextNode);
        debugLog(logName + ": replacement", linkNode);
        el.insertBefore(linkNode, n);
      }
      
    } else if (n.nodeType == n.ELEMENT_NODE
               && !skippableTags.includes(n.tagName)) {
      //debugLog(logName + ": going deeper into", n);
      recursiveLinkifyBugs(n);
    }
  }
  //debugLog(logName + ": finished for", el);
}


function callback (mutations) {
  me = logName + "[" + (++count) + "]";
  //debugLog(me + ": mutations detected", mutations);
  let addedNodes = [];
  
  for (let m of mutations) {
    //debugLog(me + ": mutation", m);

    for (let n of m.addedNodes) {
      if (n.innerHTML?.length && !skippableTags.includes(n.tagName)) {
        //debugLog(me + ": added node", n);  
        addedNodes.push(n);
      }
    }
  } 
  
  if (addedNodes.length > 0) {
    //debugLog(me +  ": linkifying new content from", addedNodes);  
    recursiveLinkifyBugs(addedNodes);
  }
}

let observer = new MutationObserver(callback);
let observerOptions = {
  childList: true,
  subtree: true
};

recursiveLinkifyBugs(document.body);

observer.observe(document.body, observerOptions);

console.info(logName + ": ready");
  return s.replace(bugRE, '<a href="' + baseUrl + '$1">$&</a>');
}
function bugUrl(s) {
  return s.replace(bugRE, baseUrl + '$1');
}

function recursiveLinkifyBugs(el) {


  if (el.childNodes === undefined) {
    //debugLog(logName + ": no child nodes in", el);
    return;
  }
  
  let i = el.childNodes.length;

  while (n = el.childNodes[--i]) {    
    //debugLog(logName + ": processing node", i, n, "from", el);
    if (n.nodeType == n.TEXT_NODE) {
      // https://stackoverflow.com/a/12212700
      while (r = bugRE.exec(n.textContent)) {
        debugLog(logName + ": found bug string in", n, "from", el);
        n = n.splitText(r.index);
        n = n.splitText(r[0].length);
        linkTextNode = n.previousSibling;
        linkNode = document.createElement('a');
        linkNode.href = bugUrl(linkTextNode.textContent);
        linkNode.appendChild(linkTextNode);
        debugLog(logName + ": replacement", linkNode);
        el.insertBefore(linkNode, n);
      }
      
    } else if (n.nodeType == n.ELEMENT_NODE
               && !skippableTags.includes(n.tagName)) {
      //debugLog(logName + ": going deeper into", n);
      recursiveLinkifyBugs(n);
    }
  }
  //debugLog(logName + ": finished for", el);
}


function callback (mutations) {
  me = logName + "[" + (++count) + "]";
  //debugLog(me + ": mutations detected", mutations);
  let addedNodes = [];
  
  for (let m of mutations) {
    //debugLog(me + ": mutation", m);

    for (let n of m.addedNodes) {
      if (n.innerHTML?.length && !skippableTags.includes(n.tagName)) {
        //debugLog(me + ": added node", n);  
        addedNodes.push(n);
      }
    }
  } 
  
  if (addedNodes.length > 0) {
    //debugLog(me +  ": linkifying new content from", addedNodes);  
    recursiveLinkifyBugs(addedNodes);
  }
}

let observer = new MutationObserver(callback);
let observerOptions = {
  childList: true,
  subtree: true
};

recursiveLinkifyBugs(document.body);

observer.observe(document.body, observerOptions);

console.info(logName + ": ready");