On 26 Jul 2014, at 10:43, Hans Hagen <pragma@wxs.nl> wrote:

> On 7/25/2014 4:31 PM, Gerben Wierda wrote:
>> Thanks all for the discussion. As a simple user, I think I must pass. All this complexity in my document text and setup is too much trouble and it seems risky (wjhat am I going to break?). Far less work to do a small check at the end.
> 
> Well, that kind of decisions demand injecting a node so there could be potential interference (as with more mechanisms that carry status info around for a second pass).
> 
> Anyway, maybe someone else benefits from the extension.
> 
>> What I was looking for was something simple that made for instance \at{page][foo] conditional, e.g.
>> 
>> \conditionalat[when]{page}[foo]
>> 
>> with ‘when’ is something like
>> 	always
>> 	onpage
>> 	offpage
>> 	onspread
>> 	offspread
>> 	never
>> 
>> Typing \conditionalat instead of \at is what I as a simpleton user can handle…
> 
> \unprotect
> 
> \unexpanded\def\strc_references_conditional#1#2[#3]#4[#5]% {text}[condition][reference]
>  {\doifcheckedpagestate{#5}%
>     {\doifelse{#3}\v!precedingpage{#1{#2}[#5]}\ignorespaces}%
>     {\doifelse{#3}\v!hencefore    {#1{#2}[#5]}\ignorespaces}%
>     {\doifelse{#3}\v!current      {#1{#2}[#5]}\ignorespaces}%
>     {\doifelse{#3}\v!hereafter    {#1{#2}[#5]}\ignorespaces}%
>     {\doifelse{#3}\v!followingpage{#1{#2}[#5]}\ignorespaces}%
>     {}}
> 
> \unexpanded\def\conditionalat   {\strc_references_conditional\at}
> \unexpanded\def\conditionalin   {\strc_references_conditional\in}
> \unexpanded\def\conditionalabout{\strc_references_conditional\about}
> 
> \protect
> 
> But I'll not enable it to the code as it's not used anyway (maybe sometime a module).

I’ve tried to add this to my environment and product file, but even without using it, it ends in an error:

(/usr/local/texlive/2014/texmf-dist/tex/context/base/spec-tpd.mkii
specials        : loading definition file fdf
(/usr/local/texlive/2014/texmf-dist/tex/context/base/spec-fdf.mkii))
! Undefined control sequence.
l.5  {\doifcheckedpagestate
                           {#5}%
?

G

> 
>> G
>> 
>> On 25 Jul 2014, at 13:06, Hans Hagen <pragma@wxs.nl> wrote:
>> 
>>> On 7/24/2014 2:03 PM, Otared Kavian wrote:
>>>> Hi,
>>>> 
>>>> Thanks for your attention, Wolfgang: indeed removing
>>>> 	\analyzecurrentreference
>>>> from your example allows mkiv to typeset correctly and obtain the expected result.
>>> 
>>>> ....
>>> 
>>> yet another sparsely documented feature ... in beta:
>>> 
>>> % tests/mkiv/pagestate-001.tex
>>> 
>>> \useMPlibrary[dum]
>>> 
>>> \setuppagenumbering
>>>  [alternative=doublesided]
>>> 
>>> % new: \setupreferencing[doublesided=no]
>>> 
>>> % old: \somewhere{backward}{foreward}[label]
>>> % new: \someplace{preceding}{backward}{current}{foreward}{following}[label]
>>> % old: \atpage[#label]
>>> % new: \doifcheckedpagestate{label}{preceding}{backward}{current}{foreward}{following}{otherwise}
>>> 
>>> \starttext
>>> 
>>> \dorecurse {20} {
>>>    \placefigure
>>>      [here]
>>>      [fig:#1]
>>>      {}
>>>      {\externalfigure[dummy]}
>>>    \dorecurse {20} {
>>>        ##1: \atpage[fig:##1] /
>>>        \doifcheckedpagestate{fig:##1}
>>>         {preceding}
>>>         {backward}
>>>         {current}
>>>         {foreward}
>>>         {following}
>>>         {otherwise}
>>>    }
>>> }
>>> 
>>> \stoptext
>>> 
>>> if okay, then it's something to wikify ... should \setupreferencing[doublesided=no] be default? (currently yes i.e. spread aware)
>>> 
>>> keep in mind that this kind of functionality once it kicks in (is used) can result in a few more runs to get thing right and that there's always the danger of oscillation as the text injected is dependent on the situation
>>> 
>>> Hans
>>> 
>>> 
>>> -----------------------------------------------------------------
>>>                                          Hans Hagen | PRAGMA ADE
>>>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>>>    tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>>>                                             | www.pragma-pod.nl
>>> -----------------------------------------------------------------
>>> ___________________________________________________________________________________
>>> If your question is of interest to others as well, please add an entry to the Wiki!
>>> 
>>> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
>>> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
>>> archive  : http://foundry.supelec.fr/projects/contextrev/
>>> wiki     : http://contextgarden.net
>>> ___________________________________________________________________________________
>> 
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to the Wiki!
>> 
>> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
>> archive  : http://foundry.supelec.fr/projects/contextrev/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
>> 
> 
> 
> -- 
> 
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>    tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                             | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________