[luatex] pre_output_filter: How to get the vertical list of the full page?

Ulrike Fischer luatex at nililand.de
Thu May 3 14:49:17 CEST 2018

Am Thu, 3 May 2018 21:35:00 +1200 schrieb Henri Menke:

> How can I access the material to be pushed from within this callback?
> Box 255 (the shipout box) is nil.  The reason I am asking this is
> because I want to implement visual debugging like in ConTeXt.  Therefore
> I want to walk the main vertical list on shipout and sprinkle it with
> whatits to draw rules for boxes, glues, kerns, etc.

the lua-visual-debug package does something similar. It uses the
atbegshi package and then calls 


(it works imho with latex and plain). 

Ulrike Fischer 

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