Re: [NTG-context] Getting dimensions in Lua

18 Jan 2021

...
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)