Hello Hans! On Wed, 25 Nov 2020 at 21:25, Hans Hagen wrote:

\startluacode context.stepwise (function() context.step() end) \stopluacode

Thank you very much! I was trying context.stepwise several times (and \dowithnextbox, \nextboxht and other things). I bet there was no example of empty context.step(). The usage was: stepping in TeX end with context.step("\\texcommands\\with\\doubleslashes") without leaving Lua. What is the purpose of empty context.step()? Knocking on TeX's door? Jano

Hello again, Hans! On Thu, 26 Nov 2020 at 09:18, Hans Hagen wrote:

(this mechanism is already kind of old, there are also other cheats possible)

Diving into functions and using context.stepwise() worked, until I've got to: /cldf-stp.lua:48: bad argument #1 to 'resume' (thread expected) and other errors. It was triar/error approach, not exactly knowing how context.stepwise() works, and I was some more lua functions and iterations before needing expansion. Therefore I've changed the strategy (cannot give up): - Create named buffers with formatted content (and store measures) before they are needed. - When needed, use the reference to the buffer. Tests looked promising. After \starttext buffers and measures are known (both TeX & Lua). Also tested in functions, etc. But inside the first \xmlsetup, they are not expanded anymore, they are typeset (like \typebuffer). - How to have them expanded in \xmlsetup? - Is other mechanism better suited for storing typeset blocks than buffers (and will survive \xmlsetup)? - If none of them is possible, what are the *other **cheats *then? Thanks, Jano MWE attached % BUFFERS \startluacode -- fill buffers for i=1,1000 do local content = "framed-" .. i context.startbuffer( { i } ) context.StartBox() context.bold(i)context.par() context.color( { "red" }, content ) context.StopBox() context.copy(false,0) context.stopbuffer() print(">>", i) end \stopluacode \def\StartBox{\setbox0=\hbox\bgroup\framed[width=50mm, background=color, backgroundcolor=gray, frame=off,align={flushleft}]% \bgroup% \vbox\bgroup} \def\StopBox{\egroup\egroup\egroup}% close vbox, framed, hbox \def\MeasureBuffer[#1]{\setbox0\hbox{\getbuffer[#1]}% ht: \the\ht0\par} % XML \startbuffer[doc] <?xml version "1.0"?> <document> <section>section</section> <section>section</section> </document> \stopbuffer \startxmlsetups xml:name \xmlsetsetup{\xmldocument}{*}{-} \xmlsetsetup{\xmldocument}{document}{xml:name:*} \stopxmlsetups \xmlregistersetup{xml:name} \startxmlsetups xml:name:document \Title{inside xml:name:document} \Title{TeX} \MeasureBuffer[333] \getbuffer[333] \Title{Lua} \startluacode context.MeasureBuffer({"444"}) context.getbuffer({"444"}) \stopluacode \stopxmlsetups \def\Title#1{\blank{\bf #1}\par} \starttext \Title{TeX} \MeasureBuffer[111] \getbuffer[111] \Title{Lua} \startluacode context.MeasureBuffer({"222"}) context.getbuffer({"222"}) \stopluacode \xmlprocessbuffer{xml:name}{doc}{} \stoptext