Xah Talk Show 2024-01-08 Ep528 Trackball, Write Emacs Lisp Command to Change Link to Dead Link

• https://youtube.com/live/6_4mlsSxpuQ

• 0:42 keyboard intro
• 1:54 nulea trackball
• 4:40 trackball history
• 5:43 thumb trackball vs index finger
• 12:15 kinesis 360 vs glove80
• 14:07 bloggin and dead links
• 15:05 nushell
• 22:10 coding elisp
• 31:19 code complete
• 32:24 API design issue

• Nulea M505 Trackball
• Trackball Controller
• Trackballs Review
• Trackball History
• Logitech Trackman 1989 Trackball
• Logitech Trackman Marble Wheel Optical Trackball
• History of Kensington Expert Mouse
• Kensington Expert Mouse Pink

• ELisp: URL to HTML Link
• ELisp: HTML Link to Dead Link
• ELisp: HTML Amazon URL Linkify
• ELisp: URL to HTML Link + Date

• HTML Link Problem, _blank noopener noreferrer

(defun xah-html-make-iframe-defunct ()
  "Make the HTML iframe under cursor to a defunct form.

for example
<iframe src=\"https://www.youtube.com/abc\" allowfullscreen></iframe>
becomes
<s>https://www.youtube.com/abc</s>

Version: 2024-01-08"
  (interactive)
  (let (xp1 xp2 xwholeLinkStr xresultStr xurl)
    (progn
      (forward-word)
      (progn
        ;; get the boundary of opening tag
        ;; <iframe src="https://www.youtube.com/embed/-vbvIJrF5dk" allowfullscreen></iframe>
        (search-backward "<iframe ")
        (setq xp1 (point))
        (search-forward "</iframe>")
        (setq xp2 (point))
        (setq xwholeLinkStr (buffer-substring-no-properties xp1 xp2))
        (with-temp-buffer
          ;; generate replacement text
          (insert xwholeLinkStr)
          (goto-char (point-min))
          (re-search-forward "src=\"\\([^\"]+?\\)\"")
          (setq xurl (match-string 1))
          (setq xresultStr (format "<s>%s</s>" xurl)))))
    (delete-region xp1 xp2)
    (goto-char xp1)
    (insert xresultStr)))