Re: [NTG-context] Typing within doifmode leads to error

20 Mar 2021


      On 3/20/2021 9:23 PM, Aditya Mahajan wrote:
...
On Sat, 20 Mar 2021, Hans Hagen wrote:
...
On 3/20/2021 4:00 PM, Christoph Reller wrote:
...
On Sat, Mar 20, 2021 at 12:12 PM Hans Hagen mailto:j.hagen@xs4all.nl> wrote:
On 3/20/2021 8:24 AM, Aditya Mahajan wrote:
      > On Sat, 20 Mar 2021, Christoph Reller wrote:
      >> Of course we can do this in lua:
      >>
      >> if tex.modes["A"] and not tex.modes{"B"] then
      >> ...
      >> end
      >
      > ... which means that you can use that at the context end as well
     (old feature).
      > Save the following as test.mkix (or add "% macros=mkix" as the
     first line):
      >
      > ```
      > \starttext
      > <?lua if tex.modes["A"] and not tex.modes["B"] then ?>
      > \starttyping
      > A and not B
      > \stoptyping
      > <?lua else ?>
      > \starttyping
      > not (A and not B)
      > \stoptyping
      > <?lua end ?>
      > \stoptext
     a neat application!
Thank you for this hint, Aditya. This would be a very nice solution
indeed. But it does not seem to work:
% macros=mkix
\definemode[A][yes]
\starttext
\startluacode
    if tex.modes['A'] then
      context("A")
    end
\stopluacode
<?lua if tex.modes['A'] then ?>
A
<?lua end ?>
\stoptext
With ConTeXt LMTX 2021.03.17 the output of the above is a single "A". I
would expect two. What am I doing wrong?
When the file gets preprocessed the mode is not known
context --mode=A foo.tex
it does of course also work when you set the mode in a parent file and
then include foo.tex
I wonder if we could have an environment, say \startluatemplate ... \stopluatemplate, which is evaluated on the fly rather than when loading a file.
define 'evaluated on the fly'
...
Aditya
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