curi.us reply/quote js + markdown link handling

// initializeComment blanks out the comment title and the comment author, sets the comment
// body to the given text, focuses the comment body, resizes the comment height to show
// all of the given text, and puts the cursor at the end of the comment body.
function initializeComment(text) {
  document.getElementById("comment_jebra").value = ""; // Title.
  document.getElementById("comment_comment_writer").value = ""; // Author.
  commentBody = document.getElementById("comment_argle"); // Body.
  window.location.href = "#post-comment"
  commentBody.focus();
  commentBody.value = text;
  autogrow()
}

function reply(commentNum) {
  initializeComment("#" + commentNum + " ");
}

function quote(commentNum) {
  reply("")
  var body = "";
  // Find the outer element for the comment to be quoted and get its child of class
  // "comment-body".  (There should be only one.) The innerText of this is what we want to
  // quote.
  var comment = document.getElementById(commentNum);
  for (var i = 0; i < comment.childNodes.length; i++) {
    if (comment.childNodes[i].className == "comment-body") {
      text = innerTextWithMarkdownLinks(comment.childNodes[i]).replace(/^(?=.)/mg, "> ");
      // Append a final pair of newlines if necessary.
      if (text.slice(-2) != "\n\n") {
        text = text + "\n\n";
      }
      initializeComment(text);
      break;
    }
  }
}

// innerTextWithMarkdownLinks returns a version of the innerText of elem
// in which all links ("a" tags) – except for links of one of the types
// below – have been replaced with markdown-style links. The types of
// links which are are left as plain text are:
// - auto-links to comment numbers (i.e., links whose innerText conists
//   of "#" followed by one or more digits)
// - raw http/https links (i.e., links whose innerText matches the
//   regexp "^https?://"
function innerTextWithMarkdownLinks(elem) {
  var orig = elem.innerHTML;
  var links = elem.getElementsByTagName("a");
  for (var i = 0; i < links.length; i++) {
    // Skip #XXXXX links.
    if (links[i].innerText.match(/^#[0-9]+$/)) {
      continue;
    }
    // Skip raw http/https links.
    if (links[i].innerText.match(/^https?:[/][/]/)) {
      continue;
    }
    // Temporarily change link to markdown-style link.
    links[i].innerHTML = "[" + links[i].innerText + "](" + links[i].href + ")"
   }
  text = elem.innerText;
  elem.innerHTML = orig; // Restore the original innerHTML.
  return text;
}