Re: creating a function that works for active region or whole buffer

[Mark Skilbeck]

Perhaps with-region-or-buffer[1] will be of help.

-mgsk

[1] 
http://irrealblog.blogspot.co.uk/2011/03/region-or-buffer-revisited-in-writing_02.html

On Tue, Jan 22, 2013 at 12:20:54PM +0100, Luca Ferrari wrote:
> Hi all,
> I'd like to write a function that can be invoked when a region is
> active, and therefore is limited to the region itself, or on the whole
> buffer if not any region is active. Therefore in my function I placed
> the following conditional to set the start-block and end-block lines
> to the whole buffer or the whole region:
> 
> 
> (if (not (null (region-beginning) ) )
>           (progn
> 
>             (setq current-block-start-line (line-number-at-pos
> (region-beginning) ) )
>             (setq current-block-end-line   (line-number-at-pos
> (region-end) ) ) )
> 
>                                         ; else mark the whole buffer
>         (progn
>           (setq current-block-start-line (line-number-at-pos (point-min) ) )
>           (setq current-block-end-line   (line-number-at-pos (point-max) ) ) 
> ) )
> 
> It seems to work, but when I mark a region, that remove the region
> (i.e., unmark) and call the function again it seems that the function
> has still the region-beginning and region-end marks (i.e., it does not
> work on the whole buffer). Is there a smarter way to see if a region
> is currently active?
> 
> Thanks,
> Luca