Re: Get rid of LuaTeX warning on duplicate destination identifier

[Aditya Mahajan <adityam@umich.edu>]

On Thu, 29 Aug 2013, Hans Hagen wrote:

> On 8/29/2013 10:15 AM, Hans Hagen wrote:
>> On 8/29/2013 4:06 AM, Aditya Mahajan wrote:
>>> Hi,
>>> 
>>> I am trying to pick up on an old thread of creating an overview page
>>> [1]. Basically, the idea is to create an overvew slide at the end of a
>>> presentation that shows the first page of different sections in a
>>> presentation. Based on Wolfgang's answer in that old thread, I save the
>>> relevant pages in a box, and then display them again at the end of the
>>> presentation.
>>> 
>>> This works, except that I get a series of warnings:
>>> 
>>> l.86 \placeoverviewpage
>>>                       LuaTeX warning (ext4): destination with the same
>>> identifier (name{aut:10}) has been already used, duplicate ignored
>>> 
>>> How do I get rid of these?
>> 
>> Tricky. The problem is that you flush a box (copy) so the message comes
>> from deep inside the backend (for good reason) and so we cannot
>> intercept it as "hey user, you use the same dest twice" simply because
>> it's a copy and not re-rendered.
>> 
>> There are two solutions:
>> 
>> (1) strip the box before copying (i can make a helper for that - later
>> as i have to go now): destinations, references, writes-to-lists etc
>> 
>> (2) you copy the old file before processing and use that one
>>
>>   \def\placeoverviewpage
>>     {\startstandardmakeup[\c!align=\v!middle]
>>         \getfiguredimensions[temp.pdf]%
>> 
>> \dorecurse{\noffigurepages}{\externalfigure[temp.pdf][\c!page=##1,\c!width=\overviewwidth]\relax\space}
>>
>>      \stopstandardmakeup}
>> 
>>> I am afraid that I cannot create a small example illustrating this
>>> warning, so I am attaching the complete test file.
>>> 
>>> [1]: http://thread.gmane.org/gmane.comp.tex.context/72556/focus=72571
>> 
>> [2] It has always been a wish of mine to have it as option in the engine
>> (pdfetex) but in luatex it's not that hard to do it myself now (i
>> already have a stripper so I can extend that one a bit).
>
> attached ... you can run the module for an example (you need a new beta)

Thanks, works nicely.

I'll add the configuration commands, and release it as a module.

Aditya
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