this post was submitted on 14 Nov 2023
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My code to send raw keystrokes to ansi-term doesn't work with Emacs 29.1 (alien.top)
submitted 11 months ago by jcubic@alien.top to c/emacs@communick.news
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I have this code:

(defun send-raw-key-fun (str)
  (lexical-let ((str str))
    (lambda ()
      (interactive)
      (term-send-raw-string (read-kbd-macro str)))))

 (define-key term-raw-map (kbd "C-c c") (send-raw-key-fun "C-c"))

and it doesn't work anymore with ansi-term. I'm not able to end the process inside.

Got error:

(wrong-type-argument stringp [3])

Does anyone know what to do to make this code work again?

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[–] 7890yuiop@alien.top 1 points 11 months ago

Looks like a bug (whether documentation or code) as read-kbd-macro still claims to return a string if possible, but nowadays it forcibly returns a vector. Please M-x report-emacs-bug to get that clarified.

You could extract a string of characters from the vector:

(mapconcat (lambda (event)
             (and (characterp event)
                  (char-to-string event)))
           (read-kbd-macro "C-c"))

But if you look at the code for read-kbd-macro you'll see that it calls this:

(defun edmacro-parse-keys (string &optional _need-vector)
  (let ((result (kbd string)))
    (if (stringp result)
        (seq-into result 'vector)
      result)))

Hence the string value you wanted is coming from kbd:

(kbd "C-c") => "^C"

There are of course arguments you can pass to kbd which won't return a string, but that would always have been the case for your code, and presumably you're not attempting to use any of those.