with-temp-buffer and undo [was: Big desktop undo buffer crashes Emacs]

with-temp-buffer and undo [was: Big desktop undo buffer crashes Emacs]

[Lars Hansen]

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Lars Hansen wrote:

>I suggest to use with-temp-buffer (and buffer-disable-undo)
>  
>
Does it ever make sense to save undo information in a temporary buffer?
If not, I suggest to disable it in with-temp-buffer.
Patch attached.

[-- Attachment #2: subr.diff --]
[-- Type: text/x-patch, Size: 761 bytes --]

*** subr.el~	2006-05-12 08:24:10.000000000 +0200
--- subr.el	2006-05-12 12:40:59.575290323 +0200
***************
*** 2220,2226 ****
  See also `with-temp-file' and `with-output-to-string'."
    (declare (indent 0) (debug t))
    (let ((temp-buffer (make-symbol "temp-buffer")))
!     `(let ((,temp-buffer (generate-new-buffer " *temp*")))
         (unwind-protect
  	   (with-current-buffer ,temp-buffer
  	     ,@body)
--- 2220,2227 ----
  See also `with-temp-file' and `with-output-to-string'."
    (declare (indent 0) (debug t))
    (let ((temp-buffer (make-symbol "temp-buffer")))
!     `(let ((,temp-buffer (generate-new-buffer " *temp*"))
!            (buffer-undo-list t))
         (unwind-protect
  	   (with-current-buffer ,temp-buffer
  	     ,@body)

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Re: with-temp-buffer and undo [was: Big desktop undo buffer crashes Emacs]

[Eli Zaretskii]

> Date: Fri, 12 May 2006 12:50:23 +0200
> From: Lars Hansen <lists@soem.dk>
> Cc: emacs-pretest-bug@gnu.org, Luc Teirlinck <teirllm@dms.auburn.edu>,
> 	rms@gnu.org, wohler@newt.com
> 
> Does it ever make sense to save undo information in a temporary buffer?

Why not?  The fact that it's temporary doesn't necessarily mean it
cannot be used interactively.  For example, I could imagine some
specialized mode that pops up a temporary buffer where the user is
supposed to type some text that the mode then uses.  Some VC-related
feature could, for example, ask for a comment or descriptive text that
way.

Re: with-temp-buffer and undo [was: Big desktop undo buffer crashes Emacs]

[Andreas Schwab]

Lars Hansen <lists@soem.dk> writes:

> Lars Hansen wrote:
>
>>I suggest to use with-temp-buffer (and buffer-disable-undo)
>>  
>>
> Does it ever make sense to save undo information in a temporary buffer?
> If not, I suggest to disable it in with-temp-buffer.
> Patch attached.
> *** subr.el~	2006-05-12 08:24:10.000000000 +0200
> --- subr.el	2006-05-12 12:40:59.575290323 +0200
> ***************
> *** 2220,2226 ****
>   See also `with-temp-file' and `with-output-to-string'."
>     (declare (indent 0) (debug t))
>     (let ((temp-buffer (make-symbol "temp-buffer")))
> !     `(let ((,temp-buffer (generate-new-buffer " *temp*")))
>          (unwind-protect
>   	   (with-current-buffer ,temp-buffer
>   	     ,@body)
> --- 2220,2227 ----
>   See also `with-temp-file' and `with-output-to-string'."
>     (declare (indent 0) (debug t))
>     (let ((temp-buffer (make-symbol "temp-buffer")))
> !     `(let ((,temp-buffer (generate-new-buffer " *temp*"))
> !            (buffer-undo-list t))
>          (unwind-protect
>   	   (with-current-buffer ,temp-buffer
>   	     ,@body)

This won't disable undo in the temp buffer, you'd need to move that below
with-current-buffer.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."

Re: with-temp-buffer and undo [was: Big desktop undo buffer crashes Emacs]

[Lars Hansen]

Andreas Schwab wrote:

>This won't disable undo in the temp buffer, you'd need to move that below
>with-current-buffer.
>  
>
Oops.

Re: with-temp-buffer and undo

[Stefan Monnier]

> !     `(let ((,temp-buffer (generate-new-buffer " *temp*"))
> !            (buffer-undo-list t))

Buffer whose name start with a space have their undo disabled by default.
I.e. someone thought of that years ago already,


        Stefan

Re: with-temp-buffer and undo

[Lars Hansen]

Stefan Monnier wrote:

>>!     `(let ((,temp-buffer (generate-new-buffer " *temp*"))
>>!            (buffer-undo-list t))
>>    
>>
>
>Buffer whose name start with a space have their undo disabled by default.
>I.e. someone thought of that years ago already,
>  
>
Cool :-)

Re: with-temp-buffer and undo

[Lars Hansen]

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Stefan Monnier wrote:

>>!     `(let ((,temp-buffer (generate-new-buffer " *temp*"))
>>!            (buffer-undo-list t))
>>    
>>
>
>Buffer whose name start with a space have their undo disabled by default.
>I.e. someone thought of that years ago already,
>  
>
Then my previous patch can be simplified.
Any objections?

[-- Attachment #2: with-temp-file.diff --]
[-- Type: text/x-patch, Size: 1498 bytes --]

*** desktop.el.~1.99.~	2006-02-19 15:43:52.000000000 +0100
--- desktop.el	2006-05-12 19:42:09.642918747 +0200
***************
*** 763,773 ****
                          (setq locals (cdr locals)))
                        ll)))
                (buffer-list)))
!           (eager desktop-restore-eager)
!           (buf (get-buffer-create "*desktop*")))
!       (set-buffer buf)
!       (erase-buffer)
! 
        (insert
          ";; -*- mode: emacs-lisp; coding: emacs-mule; -*-\n"
          desktop-header
--- 763,770 ----
                          (setq locals (cdr locals)))
                        ll)))
                (buffer-list)))
!           (eager desktop-restore-eager))
!       (with-temp-buffer
          (insert
           ";; -*- mode: emacs-lisp; coding: emacs-mule; -*-\n"
           desktop-header
***************
*** 801,807 ****
              info)
        (setq default-directory dirname)
        (let ((coding-system-for-write 'emacs-mule))
!         (write-region (point-min) (point-max) filename nil 'nomessage))))
    (setq desktop-dirname dirname))
  
  ;; ----------------------------------------------------------------------------
--- 798,804 ----
                info)
          (setq default-directory dirname)
          (let ((coding-system-for-write 'emacs-mule))
!           (write-region (point-min) (point-max) filename nil 'nomessage)))))
    (setq desktop-dirname dirname))
  
  ;; ----------------------------------------------------------------------------

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Re: with-temp-buffer and undo

[Bill Wohler]

Lars Hansen <lists@soem.dk> wrote:

> Stefan Monnier wrote:
> 
> >>!     `(let ((,temp-buffer (generate-new-buffer " *temp*"))
> >>!            (buffer-undo-list t))
> >>    
> >>
> >
> >Buffer whose name start with a space have their undo disabled by default.
> >I.e. someone thought of that years ago already,
> >  
> >
> Then my previous patch can be simplified.
> Any objections?

None from me. I've applied it and will let you know how it goes. Thanks.

-- 
Bill Wohler <wohler@newt.com>  http://www.newt.com/wohler/  GnuPG ID:610BD9AD
Maintainer of comp.mail.mh FAQ and MH-E. Vote Libertarian!
If you're passed on the right, you're in the wrong lane.

Re: with-temp-buffer and undo

[Bill Wohler]

Bill Wohler <wohler@newt.com> writes:

> Lars Hansen <lists@soem.dk> wrote:
>
>> Stefan Monnier wrote:
>> 
>> >>!     `(let ((,temp-buffer (generate-new-buffer " *temp*"))
>> >>!            (buffer-undo-list t))
>> >>    
>> >>
>> >
>> >Buffer whose name start with a space have their undo disabled by default.
>> >I.e. someone thought of that years ago already,
>> >  
>> >
>> Then my previous patch can be simplified.
>> Any objections?
>
> None from me. I've applied it and will let you know how it goes. Thanks.

So far so good. Thanks.

-- 
Bill Wohler <wohler@newt.com>  http://www.newt.com/wohler/  GnuPG ID:610BD9AD
Maintainer of comp.mail.mh FAQ and MH-E. Vote Libertarian!
If you're passed on the right, you're in the wrong lane.

Re: with-temp-buffer and undo

[Richard Stallman]

    Then my previous patch can be simplified.
    Any objections?

Your patch looks good to me.

Re: with-temp-buffer and undo [was: Big desktop undo buffer crashes Emacs]

[Richard Stallman]

Using with-temp-buffer seems like a good idea.

    Does it ever make sense to save undo information in a temporary buffer?
    If not, I suggest to disable it in with-temp-buffer.

Undo is always disabled for with-temp-buffer, because it is disabled
by default for buffers whose names start with space.