* What variable says that the buffer is in narrowed state?
@ 2007-10-13 13:30 Bastien
0 siblings, 0 replies; 5+ messages in thread
From: Bastien @ 2007-10-13 13:30 UTC (permalink / raw)
To: help-gnu-emacs
Hi,
I expected to find some `buffer-narrowed-p' variable. Is there
something like this? The mode-line is able to display this bit
of information, so I guess it might somehow be accessible.
Thanks,
--
Bastien
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: What variable says that the buffer is in narrowed state?
[not found] <mailman.2016.1192278715.18990.help-gnu-emacs@gnu.org>
@ 2007-10-13 13:45 ` Sven Joachim
2007-10-13 15:57 ` Bastien
2007-10-14 19:57 ` Stefan Monnier
0 siblings, 2 replies; 5+ messages in thread
From: Sven Joachim @ 2007-10-13 13:45 UTC (permalink / raw)
To: help-gnu-emacs
Bastien <bzg@altern.org> writes:
> I expected to find some `buffer-narrowed-p' variable. Is there
> something like this? The mode-line is able to display this bit
> of information, so I guess it might somehow be accessible.
If there were such a thing, it should probably be a function rather
than a variable. Doesn't seem there is one, so I wrote it for you:
(defun buffer-narrowed-p ()
"Return t if buffer is narrowed, nil otherwise."
(or (> (point-min) 1)
(< (point-max) (buffer-size))))
The mode-line display is coded in src/xdisp.c, look for "Narrow"
there.
Cheers,
Sven
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: What variable says that the buffer is in narrowed state?
2007-10-13 13:45 ` What variable says that the buffer is in narrowed state? Sven Joachim
@ 2007-10-13 15:57 ` Bastien
2007-10-14 19:57 ` Stefan Monnier
1 sibling, 0 replies; 5+ messages in thread
From: Bastien @ 2007-10-13 15:57 UTC (permalink / raw)
To: help-gnu-emacs
Sven Joachim <svenjoac@gmx.de> writes:
> (defun buffer-narrowed-p ()
> "Return t if buffer is narrowed, nil otherwise."
> (or (> (point-min) 1)
> (< (point-max) (buffer-size))))
Great! Thanks very much.
> The mode-line display is coded in src/xdisp.c, look for "Narrow"
> there.
Seen that -- that's why I expected some internal variable/function would
tell me about the buffer narrow-status.
--
Bastien
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: What variable says that the buffer is in narrowed state?
2007-10-13 13:45 ` What variable says that the buffer is in narrowed state? Sven Joachim
2007-10-13 15:57 ` Bastien
@ 2007-10-14 19:57 ` Stefan Monnier
2007-10-15 17:51 ` Sven Joachim
1 sibling, 1 reply; 5+ messages in thread
From: Stefan Monnier @ 2007-10-14 19:57 UTC (permalink / raw)
To: help-gnu-emacs
>> I expected to find some `buffer-narrowed-p' variable. Is there
>> something like this? The mode-line is able to display this bit
>> of information, so I guess it might somehow be accessible.
> If there were such a thing, it should probably be a function rather
> than a variable. Doesn't seem there is one, so I wrote it for you:
> (defun buffer-narrowed-p ()
> "Return t if buffer is narrowed, nil otherwise."
> (or (> (point-min) 1)
> (< (point-max) (buffer-size))))
Sometimes you can't avoid assuming that buffer positions start at 1, but
that's rare. Even in the above case, for example, you can simply check:
(defun buffer-narrowed-p ()
(> (buffer-size) (- (point-max) (point-min))))
-- Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: What variable says that the buffer is in narrowed state?
2007-10-14 19:57 ` Stefan Monnier
@ 2007-10-15 17:51 ` Sven Joachim
0 siblings, 0 replies; 5+ messages in thread
From: Sven Joachim @ 2007-10-15 17:51 UTC (permalink / raw)
To: help-gnu-emacs
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> (defun buffer-narrowed-p ()
>> "Return t if buffer is narrowed, nil otherwise."
>> (or (> (point-min) 1)
>> (< (point-max) (buffer-size))))
>
> Sometimes you can't avoid assuming that buffer positions start at 1, but
> that's rare.
What's worse is that I incorrectly assumed that buffer positions end
at (buffer-size), while they actually end at (1+ (buffer-size)). :-/
> Even in the above case, for example, you can simply check:
>
> (defun buffer-narrowed-p ()
> (> (buffer-size) (- (point-max) (point-min))))
Thanks. I'm still learning, maybe in a few years I'll be able to post
a snippet here that actually works. :-(
Slightly embarrassed,
Sven
^ permalink raw reply [flat|nested] 5+ messages in thread
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2007-10-13 13:45 ` What variable says that the buffer is in narrowed state? Sven Joachim
2007-10-13 15:57 ` Bastien
2007-10-14 19:57 ` Stefan Monnier
2007-10-15 17:51 ` Sven Joachim
2007-10-13 13:30 Bastien
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