Re: Get rid of LuaTeX warning on duplicate destination identifier

[Hans Hagen <pragma@wxs.nl>]

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).

Hans

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