[NTG-context] constructing block content partly with lua

Hans Hagen j.hagen at xs4all.nl
Tue Feb 5 16:24:36 CET 2019


On 2/5/2019 4:01 PM, Sanjoy Mahajan wrote:
> Dear List,
> 
> I've been trying to construct part of a block's content programmatically
> with Lua.  Despite many experiments and much rereading of the cld manual
> (especially chapter 3 on functions), the following attempt fails for
> reasons that perplex me.  Below is the MNWE (Minimal NonWorking
> Example).  It fails with these lines in the log file:
> 
>    structure       > sectioning > subject @ level 3 : 0.0.0 -> Answers
> 
>    tex error       > tex error on line 1 in file virtual://block.answer.1: ! Undefined control sequence
> 
>    l.1 \oneargTestparameter
> 
> 
> That is, when the "answer" block is included via \useblocks, somehow the
> beginning of the answer, which should be "\onearg{Test parameter}", has
> its curly braces and spaces elided.
> 
> What characteristic(s) of the Lua interface am I missing?  Thank you if
> you happen to where I've gone wrong.  I've also tried steppers without
> much luck (and, admittedly, without really understanding their use).
> 
> =============== testluabeginblock.tex ===============
> \defineblock[answer]
> \hideblocks[answer]
> 
> \def\onearg#1{{\bf #1}}
> \def\noarg{{\it fixed argument}}
> 
> \starttext
> 
> \startluacode
>    context.beginanswer()
>    context("\\onearg{Test parameter}")

does

context.onearg("Test parameter")

work?


> \stopluacode
> This is part of the answer.
> 
> \endanswer
> 
> \subject{Answers}
> 
> \useblocks[answer]
> 
> \stoptext
> =============== end testluabeginblock.tex ===============
> 
> -Sanjoy
> 
> 
> 
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