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From: Carsten Dominik <dominik@science.uva.nl>
To: Robert Goldman <rpgoldman@sift.info>
Cc: emacs-orgmode@gnu.org
Subject: Re: question about org-region-active-p
Date: Wed, 17 Dec 2008 17:29:23 +0100	[thread overview]
Message-ID: <531B6C47-6267-4530-ACF8-F2C1548159CE@uva.nl> (raw)
In-Reply-To: <494908C5.5050702@sift.info>

Dear Robert,

also region-active-p requires transient-mark-mode to be active, if you  
at the definition of the region-active-p function, you will see that.

transient-mark-mode is on by default in Emacs.  Why did you turn it  
*off* in the
first place?????

- Carsten

On Dec 17, 2008, at 3:12 PM, Robert Goldman wrote:

> Carsten Dominik wrote:
>> Hi Robert,
>> no, I do not think this would make sense, to step out with
>> an error, because all the commands that need a region will
>> also work without one.  This is how regions work in Emacs.
>> If you find places in the documentation where this could
>> be made clearer, let me know.
> Thank you Carsten for the response.  I am still inclined to think that
> this case is one where the user should get some warning because it's  
> in
> that bad class of bug-like situations where code quietly does  
> something
> that the user does not expect and that contradicts the documentation.
> On the other hand, I can't see where one would raise an error.  It's  
> not
> an error to call org-region-active-p without transient-mark-mode;  
> indeed
> some libraries turn this on and off, and the user is entitled not to  
> use it.
> The call to export isn't right, because the export command does not  
> give
> the system any opportunity to infer whether the user intended to  
> operate
> on a region or on the whole.  So there's no way to tell that the  
> user's
> expectations are going to be violated.
> The loading of org-mode isn't the right place, either, since the vast
> majority of org-mode works just fine with t-m-m turned off.
> I'm inclined to think that the answer is simply that one shouldn't  
> turn
> transient-mark-mode off, ever.  This works for me, but I hate to think
> of the next person coming along to fall into this same trap, from  
> which
> the only means of escape is to inspect the source code and use the  
> debugger.
> I would suggest a modification to the manual and will submit one, but
> need clarification about one issue:  the use of t-m-m seems to be a
> fallback for older emacsen that don't have region-active-p.  I have  
> such
> an emacs, so I don't know --- does this mean that on newer emacsen
> org-region-active-p will work even without transient-mark-mode?
> Best,
> Robert

  reply	other threads:[~2008-12-17 16:29 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-16  1:51 question about org-region-active-p Robert Goldman
2008-12-16  2:20 ` Samuel Wales
2008-12-16  7:53 ` Carsten Dominik
2008-12-16 15:43   ` Robert Goldman
2008-12-17  8:13     ` Carsten Dominik
2008-12-17 14:12       ` Robert Goldman
2008-12-17 16:29         ` Carsten Dominik [this message]
2008-12-17 16:38           ` Robert Goldman
2008-12-17 16:44           ` Bernt Hansen
2008-12-17 17:01             ` Carsten Dominik
2008-12-18 16:48               ` Robert Goldman
2008-12-19  8:39                 ` Carsten Dominik
2008-12-16 15:52 ` William Henney

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