On Sat, 11 Sep 2021, Hans Hagen wrote:
> On 9/11/2021 5:11 AM, Aditya Mahajan via ntg-context wrote:
> > I sometimes define lua functions for showing out worked out calculations.
> > The following minimal example shows that
> >
> > context([[\startformula ... \stopformula]])
> >
> > fails in LMTX with an error message:
> >
> > tex error > tex error on line 3 in file ./test.tex: Undefined control
> > sequence \undefined
> >
> > MWE:
> >
> > \startluacode
> > thirddata = thirddata or {}
> >
> > local comment = [[
> > This is a famous formula
> > \startformula
> > a^2 + b^2 = c^2
> > \stopformula
> > ]]
> >
> > function thirddata.explanation()
> > context(comment)
> > end
> >
> > \stopluacode
> >
> > \starttext
> > \ctxlua{thirddata.explanation()}
> > \stoptext
> >
> > The actual use case is more complicated (where I use templates, so I don't
> > want to convert everything to context.startformula() etc.). The example
> > compiles with MkIV but not LMTX.
> >
> > Any idea what is going on?
> \enabletrackers[context*]
>
> shows that we have an unprotected \startformula so we need this in
> strc-mat.mkxl:
>
> \permanent\protected\defcsname\e!start\v!formula\endcsname{\strc_formulas_start_formula{}}
> \permanent\protected\defcsname\e!stop
> \v!formula\endcsname{\strc_formulas_stop_formula}
>
> \permanent\tolerant\protected\def\defineformulaalternative[#1]#*[#2]#*[#3]%
> {\frozen\instance\protected\defcsname\e!start#1\v!formula\endcsname{#2}%
> \frozen\instance\protected\defcsname\e!stop #1\v!formula\endcsname{#3}}
>
> (the \protected probably got lost when i added overload protection etc)
Thanks! This fixes the error in my main document as well.
Aditya
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