* narrow question
@ 2006-09-26 13:03 ray
0 siblings, 0 replies; 4+ messages in thread
From: ray @ 2006-09-26 13:03 UTC (permalink / raw)
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I have learned to use narrow-to-region to narrow a buffer. But how can I
determine whether a buffer is narrowed with elisp? Thanks.
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* Re: narrow question
[not found] <mailman.7430.1159275829.9609.help-gnu-emacs@gnu.org>
@ 2006-09-26 17:51 ` Barry Margolin
2006-09-27 11:45 ` ray
2006-09-27 11:53 ` David Kastrup
0 siblings, 2 replies; 4+ messages in thread
From: Barry Margolin @ 2006-09-26 17:51 UTC (permalink / raw)
In article <mailman.7430.1159275829.9609.help-gnu-emacs@gnu.org>,
ray <hantechs@gmail.com> wrote:
> I have learned to use narrow-to-region to narrow a buffer. But how can I
> determine whether a buffer is narrowed with elisp? Thanks.
(defun buffer-narrowed-p ()
(/= (- (point-max-marker) (point-min-marker))
(buffer-size)))
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: narrow question
2006-09-26 17:51 ` narrow question Barry Margolin
@ 2006-09-27 11:45 ` ray
2006-09-27 11:53 ` David Kastrup
1 sibling, 0 replies; 4+ messages in thread
From: ray @ 2006-09-27 11:45 UTC (permalink / raw)
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It works, Thank you.
On 9/27/06, Barry Margolin <barmar@alum.mit.edu> wrote:
>
> In article <mailman.7430.1159275829.9609.help-gnu-emacs@gnu.org>,
> ray <hantechs@gmail.com> wrote:
>
> > I have learned to use narrow-to-region to narrow a buffer. But how can I
> > determine whether a buffer is narrowed with elisp? Thanks.
>
> (defun buffer-narrowed-p ()
> (/= (- (point-max-marker) (point-min-marker))
> (buffer-size)))
>
> --
> Barry Margolin, barmar@alum.mit.edu
> Arlington, MA
> *** PLEASE post questions in newsgroups, not directly to me ***
> *** PLEASE don't copy me on replies, I'll read them in the group ***
> _______________________________________________
> help-gnu-emacs mailing list
> help-gnu-emacs@gnu.org
> http://lists.gnu.org/mailman/listinfo/help-gnu-emacs
>
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: narrow question
2006-09-26 17:51 ` narrow question Barry Margolin
2006-09-27 11:45 ` ray
@ 2006-09-27 11:53 ` David Kastrup
1 sibling, 0 replies; 4+ messages in thread
From: David Kastrup @ 2006-09-27 11:53 UTC (permalink / raw)
Barry Margolin <barmar@alum.mit.edu> writes:
> In article <mailman.7430.1159275829.9609.help-gnu-emacs@gnu.org>,
> ray <hantechs@gmail.com> wrote:
>
>> I have learned to use narrow-to-region to narrow a buffer. But how can I
>> determine whether a buffer is narrowed with elisp? Thanks.
>
> (defun buffer-narrowed-p ()
> (/= (- (point-max-marker) (point-min-marker))
> (buffer-size)))
That is a bad idea since it creates unnecessary markers which slow
down editing until they are garbage-collected. Just use (point-max)
and (point-min) instead.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
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2006-09-26 17:51 ` narrow question Barry Margolin
2006-09-27 11:45 ` ray
2006-09-27 11:53 ` David Kastrup
2006-09-26 13:03 ray
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