Dear list,
Recently I answered a question on TeX.SX where it was necessary to go
through an already typeset vbox and examine it line by line. Therefore
I used the macro \eatlines from Viktor Eijkhout's "TeX by Topic", here
a version tailored to my needs:
\def\eatlines{%
\setbox\scratchbox=\lastbox
\ifvoid\scratchbox\else
\unskip\unpenalty
{\eatlines}%
\setbox\scratchbox=\hbox{\unhbox\scratchbox}%
% Do something with scratchbox, e.g. examine width
\fi
}
It is then used like
\vbox{ ... some content ... \par\eatlines}
The macro goes through all hboxes (lines) in the vertical list until
there is none left (\ifvoid) and unpacks each hbox into a new one.
I was wondering, can the same thing be done in Lua (with probably less
and more readable code)?
Kind regards,
Henri
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