[Dev-luatex] keeping in sync with pdftex changes

Hans Hagen j.hagen at xs4all.nl
Tue Jan 12 15:51:32 CET 2021

On 1/12/2021 3:07 PM, Ulrike Fischer wrote:
> Am Tue, 12 Jan 2021 12:59:55 +0100 schrieb Hans Hagen:
>> It will be:
>> \protected\def\pdfrunninglinkoff{\pdfextension linkstate 1 }
>> \protected\def\pdfrunninglinkon {\pdfextension linkstate 0 }
> Sounds good. How can one test if the extension is there? Do one has
> to test against the luatex version or is there something like a
> \ifdefinedextension test?

When Luigi has pushed the code in svn the development_id will be bumped 
so you can check a test version with:


which currently is 7395. That is the most detailed info the engine 
provides (and i normally use that one when I need to adapt).

Or you can do something:

\ifnum\directlua{tex.print(node.whatsits()[32] == "pdf_link_state" and 1 
or 0)}=1
Or whatever suits your system best.
It's no big deal to wrap that lua call in a macro. Then, when there is a 
new release ypou can use the version number. We don't bump version 
numbers unless we release. The next bump will quite likely be the next 
texlive release.


                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl

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