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bug#8948: 24.0.50; y-or-n-p doesn't support scroll-o-w like yes-or-no-p


From: Thierry Volpiatto
Subject: bug#8948: 24.0.50; y-or-n-p doesn't support scroll-o-w like yes-or-no-p
Date: Thu, 30 Jun 2011 16:57:40 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Thierry Volpiatto <address@hidden> writes:

> Hi,
> after discussion about bug#8927, i discover that 
> from a yes-or-no-p i can scroll-other-window, but not from a
> y-or-n-p.

This allow scrolling from a y-or-n-p:


#+BEGIN_SRC lisp
(defun y-or-n-p (prompt)
  "Ask user a \"y or n\" question.  Return t if answer is \"y\".
PROMPT is the string to display to ask the question.  It should
end in a space; `y-or-n-p' adds \"(y or n) \" to it.

No confirmation of the answer is requested; a single character is enough.
Also accepts Space to mean yes, or Delete to mean no.  \(Actually, it uses
the bindings in `query-replace-map'; see the documentation of that variable
for more information.  In this case, the useful bindings are `act', `skip',
`recenter', and `quit'.\)

Under a windowing system a dialog box will be used if `last-nonmenu-event'
is nil and `use-dialog-box' is non-nil."
  ;; ¬°Beware! when I tried to edebug this code, Emacs got into a weird state
  ;; where all the keys were unbound (i.e. it somehow got triggered
  ;; within read-key, apparently).  I had to kill it.
  (let ((answer 'recenter))
    (if (and (display-popup-menus-p)
             (listp last-nonmenu-event)
             use-dialog-box)
        (setq answer
              (x-popup-dialog t `(,prompt ("yes" . act) ("No" . skip))))
      (setq prompt (concat prompt
                           (if (eq ?\s (aref prompt (1- (length prompt))))
                               "" " ")
                           "(y or n) "))
      (while
          (let* ((key
                  (let ((cursor-in-echo-area t))
                    (when minibuffer-auto-raise
                      (raise-frame (window-frame (minibuffer-window))))
                    (read-key (propertize (if (or (eq answer 'recenter)
                                                  (eq com 'scroll-other-window)
                                                  (eq com 
'scroll-other-window-down))
                                              prompt
                                            (concat "Please answer y or n.  "
                                                    prompt))
                                          'face 'minibuffer-prompt)))))
            (setq answer (lookup-key query-replace-map (vector key) t))
            (setq com (lookup-key global-map (vector key) t))
            (cond
              ((eq com 'scroll-other-window)
               (with-selected-window (minibuffer-window)
                 (scroll-other-window 1)) t)
              ((eq com 'scroll-other-window-down)
               (with-selected-window (minibuffer-window)
                 (scroll-other-window -1)) t)
              ((memq answer '(skip act)) nil)
              ((eq answer 'recenter) (recenter) t)
              ((memq answer '(exit-prefix quit)) (signal 'quit nil) t)
              (t t)))
        (ding)
        (discard-input)))
    (let ((ret (eq answer 'act)))
      (unless noninteractive
        (message "%s %s" prompt (if ret "y" "n")))
      ret)))

#+END_SRC

>
>
> In GNU Emacs 24.0.50.17 (i686-pc-linux-gnu, GTK+ Version 2.24.4)
>  of 2011-06-27 on thierry-MM061
> Windowing system distributor `The X.Org Foundation', version 11.0.11001000
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>   display-time-mode: t
>   diff-auto-refine-mode: t
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-- 
A+ Thierry
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