[NTG-context] Typing within doifmode leads to error

Hans Hagen j.hagen at xs4all.nl
Sat Mar 20 21:49:55 CET 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 <j.hagen at xs4all.nl
>>> <mailto:j.hagen at 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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