On 18 Jan 2021, at 10:45, Hans Hagen wrote:

On 1/18/2021 1:58 AM, Jairo A. del Rio wrote:

...

Hi, list. I want to get some dimensions in Lua. See, for instance \starttext \the\dimexpr\availablehsize\relax %say, 426pt \stoptext Is there an equivalent in ConTeXt for Lua, i.e. without passing values from TeX or, at least, using only Lua commands? Thank you in advance. tex being tex, there is always a way ...

There is also this option: % function returns scaled points \startluacode function availablehsize() local l = tex.dimen.hsize - tex.skip.leftskip.width - tex.skip.rightskip.width if tex.count.hangafter<0 then local h = tex.dimen.hangindent if h>0 then l = l - h else l = l + h end end return l end \stopluacode But I suspect that there are multiple cases where this does not work (like when used in horizontal mode, for example if the par setting changes before the \par is seen, or when there is data in the local par node) Best wishes, Taco — Taco Hoekwater E: taco@bittext.nl genderfluid (all pronouns)

To be wikified (by me, obviously). Thank you for such a great number of alternatives. Jairo :) El lun, 18 de ene. de 2021 a la(s) 04:45, Hans Hagen (j.hagen@xs4all.nl) escribió:

On 1/18/2021 1:58 AM, Jairo A. del Rio wrote:

...

Hi, list.

I want to get some dimensions in Lua. See, for instance

\starttext

\the\dimexpr\availablehsize\relax %say, 426pt

\stoptext

Is there an equivalent in ConTeXt for Lua, i.e. without passing values from TeX or, at least, using only Lua commands? Thank you in advance. tex being tex, there is always a way ...

1: \number\dimexpr\availablehsize\relax

2: \startluacode

token.set_macro(tex.ctxcatcodes,"temp","\\scratchdimen\\availablehsize") token.expand_macro("temp") context(tex.getdimen("scratchdimen")) \stopluacode

3: \startluacode

token.set_macro(tex.ctxcatcodes,"temp","\\scratchdimen\\availablehsize") tex.runlocal("temp") context(tex.getdimen("scratchdimen")) \stopluacode

4: \startluacode tex.print("\\scratchdimen\\availablehsize") tex.pushlocal() tex.poplocal() context(tex.getdimen("scratchdimen")) \stopluacode

5: \startluacode tex.print("\\dimensiondef\\temp\\availablehsize") tex.pushlocal() tex.poplocal() context(tex.getdimensionvalue("temp")) \stopluacode

\def\calculateavailablehsize{\dimensiondef\temp\availablehsize}

6: \startluacode token.expand_macro("calculateavailablehsize") context(tex.getdimensionvalue("temp")) \stopluacode

\newtoks\tcalculateavailablehsize \tcalculateavailablehsize{\dimensiondef\temp\availablehsize}

7: \startluacode -- mkiv tex.runtoks("tcalculateavailablehsize") context(tex.getdimensionvalue("temp")) \stopluacode

i'm (still) considering a way to flag a macro to be an expression (or value) but there are several variants possible but normally it takes a while before i decide what makes most sense (as i need to apply it in real code to see if it looks nice)

Hans

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