buffer-narrowed-p

buffer-narrowed-p

[Andreas Röhler]

Hi,

a couple of functions should behave different if buffer
is narrowed, i.e. taking narrowing already as
users decision to work on it, dismissing check for region
then.

As its used repeatedly, here an essay to solve it one
for all:

(defun buffer-narrowed-p ()
   (interactive)
   "Returns t, if buffer is narrowed. "
   (save-restriction
     (lexical-let ((beg (point-min))
                   (end (point-max))
                   erg)
       (widen)
       (setq erg (not (and (eq beg (point-min)) (eq end (point-max)))))
       (when (interactive-p)
         (if erg (message "Buffer is narrowed to: %d %d" beg end)
           (message "Buffer not narrowed: %s" "nil")))
       erg)))

Comments welcome :-)

Andreas

--
https://code.launchpad.net/~a-roehler/python-mode
https://code.launchpad.net/s-x-emacs-werkstatt/

Re: buffer-narrowed-p

[Lennart Borgman]

On Sat, Aug 14, 2010 at 2:33 PM, Andreas Röhler
<andreas.roehler@easy-emacs.de> wrote:
>
>
> Hi,
>
> a couple of functions should behave different if buffer
> is narrowed, i.e. taking narrowing already as
> users decision to work on it, dismissing check for region
> then.
>
> As its used repeatedly, here an essay to solve it one
> for all:
>
> (defun buffer-narrowed-p ()
>  (interactive)
>  "Returns t, if buffer is narrowed. "
>  (save-restriction
>    (lexical-let ((beg (point-min))
>                  (end (point-max))
>                  erg)
>      (widen)
>      (setq erg (not (and (eq beg (point-min)) (eq end (point-max)))))
>      (when (interactive-p)
>        (if erg (message "Buffer is narrowed to: %d %d" beg end)
>          (message "Buffer not narrowed: %s" "nil")))
>      erg)))
>
> Comments welcome :-)


I have this (which I think I stole from a comment by Stefan) in
ourcomments-util.el in nXhtml:

;;;###autoload
(defun buffer-narrowed-p ()
  "Return non-nil if the current buffer is narrowed."
  (/= (buffer-size)
      (- (point-max)
         (point-min))))

Re: buffer-narrowed-p

[Andreas Röhler]

Am 14.08.2010 14:39, schrieb Lennart Borgman:
> On Sat, Aug 14, 2010 at 2:33 PM, Andreas Röhler
> <andreas.roehler@easy-emacs.de>  wrote:
>>
>>
>> Hi,
>>
>> a couple of functions should behave different if buffer
>> is narrowed, i.e. taking narrowing already as
>> users decision to work on it, dismissing check for region
>> then.
>>
>> As its used repeatedly, here an essay to solve it one
>> for all:
>>
>> (defun buffer-narrowed-p ()
>>   (interactive)
>>   "Returns t, if buffer is narrowed. "
>>   (save-restriction
>>     (lexical-let ((beg (point-min))
>>                   (end (point-max))
>>                   erg)
>>       (widen)
>>       (setq erg (not (and (eq beg (point-min)) (eq end (point-max)))))
>>       (when (interactive-p)
>>         (if erg (message "Buffer is narrowed to: %d %d" beg end)
>>           (message "Buffer not narrowed: %s" "nil")))
>>       erg)))
>>
>> Comments welcome :-)
>
>
> I have this (which I think I stole from a comment by Stefan) in
> ourcomments-util.el in nXhtml:
>
> ;;;###autoload
> (defun buffer-narrowed-p ()
>    "Return non-nil if the current buffer is narrowed."
>    (/= (buffer-size)
>        (- (point-max)
>           (point-min))))
>

Should be faster, thanks!