narrow question

narrow question

[ray]

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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

[Barry Margolin]

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 ***

Re: narrow question

[ray]

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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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Re: narrow question

[David Kastrup]

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