[NTG-context] LUA API for page numbers

[Luc Chabassier <luc@dwarfmaster.net>]

Hi everyone,

I have recently migrated my PhD dissertation from LaTeX to ConTeXt. In
LaTeX I was using kaobook, a template with lots of margin notes, but I
was frustrated with the automatic placement of the notes.

I implemented a system using overlays that automatically places the
notes using lua. To know where the ideal placement should be (if they do
not interact with each other), I use lua to insert a latelua whatsit
that uses lpdf.getpos() to get the coordinate on the rendered page.
However, I haven't found a way to get the page number using lua, and the
tex macro \pagenumber is unreliable near pagebreaks.

Furthermore, it would be helpful to know if there is a way to access the
position and sizes of figures at the end.

Thanks,
Luc

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