xah talk show 2020-09-13 emacs lisp xah-remove-console-log, live coding + tutorial

• Escher Chameleon Polyhedron
• Math in Second Life
• write a elisp command to remove text console.log(body) but keep body.

(defun xah-remove-console-log ()
  "Remove the 「console.log(‹body›)」 but keep ‹body›, in current text block or text selection.

Version 2020-09-13 "
  (interactive)
  (let (p1 p2 posBeginConsole posLeftParen)
    (if (use-region-p)
        (setq p1 (region-beginning) p2 (region-end))
      (save-excursion
        (search-backward "\n\n" nil "NOERROR" )
        (search-forward "\n\n" nil "NOERROR" )
        (setq p1 (point))
        (search-forward "\n\n" nil "NOERROR" )
        (search-backward "\n\n" nil "NOERROR" )
        (setq p2 (point))))
    (save-restriction
      (narrow-to-region p1 p2)
      (goto-char (point-min))
      (while
          (re-search-forward "console ?\\. ?log" nil "NOERROR")
        (setq posBeginConsole (match-beginning 0))
        (search-forward "(")
        (setq posLeftParen (point))
        (backward-char 1)
        (forward-sexp)
        (delete-char -1)
        (delete-region posBeginConsole posLeftParen)))))

xah_talk_show_2020-09-13.txt