> \startluacode
> io.savedata("settings.txt", context("\\textwidth"))
> \stopluacode

Found it myself:
number.todimen(tex.dimen.textwidth)

Sorry for the noise.

But now I need the current font name, even better the current values for rm, ss 
and tt fonts.
I found p.123 of cld-mkiv.pdf, but don’t know how to address these values.


Greetlings, Hraban
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