Re: better than read-hide-char

["Clément Pit-Claudel" <cpitclaudel@gmail.com>]

On 2018-07-30 22:25, Richard Stallman wrote:
> How about a feature whereby instead of ******************* or .............
> the password echoes as 012345678901234567890123456789...
> That way, you could tell how many characters you have successfully typed
> even when they are 20, 30, 40, 50, 60 or 70 characters.
> That would help people notice some mistakes in long passwords.

This sounds like a good idea, but I think it'd be even better to put that information in the modeline of the window above the minibuffer, rather than in the minibuffer itself. Something like this, partly copied from eldoc:

(progn
  (defvar passwd-mode-line nil)
  (put 'passwd-mode-line 'risky-local-variable t)

  (minibuffer-with-setup-hook
      (lambda ()
        (add-hook 'minibuffer-exit-hook (lambda () (setq passwd-mode-line nil)) nil t)
        (let ((prefix-len (buffer-size)))
          (with-current-buffer
              (window-buffer
               (or (window-in-direction 'above (minibuffer-window))
	           (minibuffer-selected-window)
	           (get-largest-window)))
            (when mode-line-format
              (unless (and (listp mode-line-format)
		           (assq 'passwd-mode-line mode-line-format))
	        (setq mode-line-format
	              `("" (passwd-mode-line passwd-mode-line) ,mode-line-format))))
            (setq passwd-mode-line
                  (concat (make-string (1+ prefix-len) ?\s)
                          "0123456789012345678901234567890"))
            (force-mode-line-update))))
    (read-passwd "Test: ")))

Clément.