How to make a command ask "You *really* want to do this?"

How to make a command ask "You *really* want to do this?"

[David Combs]

I just discovered, to my horror, that C-x C-c does
a save-buffers-exit-emacs (I've always exited by
doing that "by hand", ie M-x save-buff...).

It was only via C-h l (ell) and then C-h k that
I discovered this (yeah, rtfm, David).

Anyway, I do like how C-x n asks if I'm sure that
I really want to narrow; I'd like to get
eg C-x C-c to do the same thing (requiring a
fully-typed-in "yes", maybe even two of them!),

Especially when it's late late at night, eg
4am, and I'm dead tired, and don't want
some knee-jerk <return> or "y", etc, to
result in a sometimes very-unpleasant surprise.

(Especially since (1) I tend to keep emacs "up" for
days at a time, and (2) I often keep various things
*scratch*.)

What methods do *you* use for installing such
protections-from-oneself?

Thanks

David

Re: How to make a command ask "You *really* want to do this?"

[Jesper Harder]

dkcombs@panix.com (David Combs) writes:

> Especially when it's late late at night, eg 4am, and I'm dead tired,
> and don't want some knee-jerk <return> or "y", etc, to result in a
> sometimes very-unpleasant surprise.
>
> (Especially since (1) I tend to keep emacs "up" for days at a time,
> and (2) I often keep various things *scratch*.)
>
> What methods do *you* use for installing such
> protections-from-oneself?

Yeah, I like to protect *scratch*, too.  I have this in my .emacs
to make Emacs query before killing *scratch*:

(defun jh-setup-scratch ()
  (with-current-buffer "*scratch*"
    (setq buffer-offer-save t)
    (make-local-variable 'kill-buffer-query-functions)
    (setq kill-buffer-query-functions
	  (list (lambda ()
		  (if (buffer-modified-p) 
		      (y-or-n-p "Really kill buffer? ")
		    t))))))
(add-hook 'emacs-startup-hook 'jh-setup-scratch)

Change `y-or-n-p' to `yes-or-no-p' if you'd prefer to answer
"yes"/"no".

Re: How to make a command ask "You *really* want to do this?"

[Heinz Rommerskirchen]

dkcombs@panix.com (David Combs) writes:

 
> What methods do *you* use for installing such
> protections-from-oneself?

Years ago I copied the following from the usenet into my .emacs

(setq kill-emacs-query-functions
      (cons (lambda () (yes-or-no-p "Really kill Emacs? "))
	    kill-emacs-query-functions))

But since 21.1 (?) there is the variable confirm-kill-emacs

-- 
Regards

Heinz

Re: How to make a command ask "You *really* want to do this?"

[Stefan Monnier]

>>>>> "Heinz" == Heinz Rommerskirchen <Heinrich.Rommerskirchen@siemens.com> writes:
> Years ago I copied the following from the usenet into my .emacs
> (setq kill-emacs-query-functions
>       (cons (lambda () (yes-or-no-p "Really kill Emacs? "))
> 	    kill-emacs-query-functions))

The proper way to write it nowadays is:

  (add-hook 'kill-emacs-query-functions
            (lambda () (yes-or-no-p "Really kill Emacs? ")))


-- Stefan

Re: How to make a command ask "You *really* want to do this?"

[Henrik Enberg]

"Stefan Monnier" <monnier+gnu.emacs.help/news/@flint.cs.yale.edu> writes:

>>>>>> "Heinz" == Heinz Rommerskirchen <Heinrich.Rommerskirchen@siemens.com> writes:
>> Years ago I copied the following from the usenet into my .emacs
>> (setq kill-emacs-query-functions
>>       (cons (lambda () (yes-or-no-p "Really kill Emacs? "))
>> 	    kill-emacs-query-functions))
>
> The proper way to write it nowadays is:
>
>   (add-hook 'kill-emacs-query-functions
>             (lambda () (yes-or-no-p "Really kill Emacs? ")))

Or in this particular case: 

        (setq confirm-kill-emacs 'yes-or-no-p)

Re: How to make a command ask "You *really* want to do this?"

[Eric Hanchrow]

>>>>> "David" == David Combs <dkcombs@panix.com> writes:

    David> Anyway, I do like how C-x n asks if I'm sure that I really
    David> want to narrow; I'd like to get eg C-x C-c to do the same
    David> thing (requiring a fully-typed-in "yes", maybe even two of
    David> them!),

Simply "disable" the command, like so:

        (put 'save-buffers-kill-emacs 'disabled 
                "Nobody in their right mind would ever want to kill Emacs.\n")

-- 

      |\      _,,,---,,_
ZZZzz /,`.-'`'    -.  ;-;;,_
     |,4-  ) )-,_. ,\ (  `'-'
    '---''(_/--'  `-'\_) fL
        -- Igor Pechtchanski

Re: How to make a command ask "You *really* want to do this?"

[Chris McMahan]

Here's some code to do just that...

;;;======================================================================
;;; ask if you REALLY want to quit emacs
;;;======================================================================
(defun ask-before-quit ()
  "Ask if the user really wants to quit Emacs."
  (interactive)
  (y-or-n-p "Really quit emacs? "))

(add-hook 'kill-emacs-query-functions 'ask-before-quit)



Eric Hanchrow <offby1@blarg.net> writes:

> >>>>> "David" == David Combs <dkcombs@panix.com> writes:
> 
>     David> Anyway, I do like how C-x n asks if I'm sure that I really
>     David> want to narrow; I'd like to get eg C-x C-c to do the same
>     David> thing (requiring a fully-typed-in "yes", maybe even two of
>     David> them!),
> 
> Simply "disable" the command, like so:
> 
> (put 'save-buffers-kill-emacs 'disabled 
>         "Nobody in their right mind would ever want to kill Emacs.\n")
> 
> -- 
> 
>       |\      _,,,---,,_
> ZZZzz /,`.-'`'    -.  ;-;;,_
>      |,4-  ) )-,_. ,\ (  `'-'
>     '---''(_/--'  `-'\_) fL
>         -- Igor Pechtchanski

-- 
     (.   .)
  =ooO=(_)=Ooo========================
  Chris McMahan | cmcmahan-AT-one.net
  ====================================

Re: How to make a command ask "You *really* want to do this?"

[Per Abrahamsen]

dkcombs@panix.com (David Combs) writes:

> Anyway, I do like how C-x n asks if I'm sure that
> I really want to narrow; I'd like to get
> eg C-x C-c to do the same thing (requiring a
> fully-typed-in "yes", maybe even two of them!),

M-x disable-command <ret> save-buffers-exit-emacs <ret>

Re: How to make a command ask "You *really* want to do this?"

[David Combs]

Thanks for all the suggestions!

David