Re: \everyaftershipout isn't "called" for every pagebreak

[Hans Hagen <pragma@wxs.nl>]

On 17-1-2010 23:13, Andreas Schneider wrote:
>> dealing with multipass data in mkiv is completely different from mkii
>> and at some point there will be a proper api for users (makes no sense
>> now as i might as well change internals along with luatex developments)
>>
>> in mkiv we store info in tables and much is available during a document
>> run anyway (in mkii we filter data from the tuo file) so the question
>> is, what info do you need? it's probably easier to provide it as core
>> functionality
>>
>> so i need speccs and a small test file
>>
>> Hans
>
> Thanks for that info!
> I think for specs my "plan" is too vague. I will explain what my goal is
> then you either see a good solution and/or tell me that this is out of scope
> for now :-)
>
> The test file to demonstrate the problem is in my initial newsgroup post for
> this thread. I will re-attach it here.
>
> What I need would be a precise page break handling. Currently ConTeXt seems
> to process a whole paragraph as one object, and then breaks it down to
> individual pages. That leads to a problem however:
> I want to refine my citation style. All bibliography is inserted into
> footnotes. If two (or more) consecutive citations _on the same page_ refer
> to the same bib entry, the footnote for that citation should read "Ibidem".
> Therefore I have to remember the last cited entry. Currently I use
> \appendtoks...\to\everyaftershipout to reset/clear the variable I use for
> storing that last entry. That works fine as long as the paragraphs are
> small. If however several citations within one (possibly large) paragraph
> are separated by a page break, the output will be wrong, since the event to
> reset the variable occurs too late (see above).
>
> The problem can be demonstrated with this example - the first footnote on
> each page should be "New".
>
> \define\test{\doifelse{\getvalue{testvar}}{page}{%
>    \footnote{Repeat}%
> }{%
>    \footnote{New}%
>    \setvalue{testvar}{page}%
> }}
>
> \appendtoks
>    \global\setvalue{testvar}{}
> \to\everyaftershipout
>
> \starttext
>    \dorecurse{10}{\dorecurse{250}{text }\test}
>
>    \dorecurse{10}{\dorecurse{250}{text }\test}
> \stoptext

as it takes less time wrting a helper than explaining how to do it i 
just added it as feature (a few years from probably only wolfgang 
remembers that it's there)

i'll upload a beta to the website that provides ...

\starttext

\dorecurse {100} {
     test \footnote{\doifnoteonsamepageelse[footnote]{ibidem}{aaa}}
}

\stoptext

keep in mind that such features, depending on multiple passes, might 
result in a few more as it will never get things right the first time

actually, in some cases it might make sense to delete the tuc file 
before a run

Hans

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                                           Hans Hagen | PRAGMA ADE
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