Am 18.10.2012 10:42, schrieb Paul Isambert:

> Similar to the linebreak callbacks, I've been thinking about the following:
> 
> - A pre_shipout would take whatever box is passed to \shipout and return a
> similar one; returning nothing would cancel shipout, i.e. it'd be a dead 
> cycle.
>
> - A shipout callback would take what the preceding returns, and return PDF 
> code
> representing the page,

Plus allow transferring a table of page boxes from pre_shipout to
shipout to make shuffling pages in the former hook easy.  Or balancing
as in Patricks case, or anything that requires looking at more than one
page at a time and is simple enough that you don't need to write a
customized output routine.

Best regards,
Stephan Hennig

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