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Re: Conditional definition of Scheme functions and typesetting of trees


Chronological Thread 
  • From: Massimiliano Gubinelli <address@hidden>
  • To: Giovanni Piredda <address@hidden>
  • Cc: address@hidden
  • Subject: Re: Conditional definition of Scheme functions and typesetting of trees
  • Date: Tue, 17 Nov 2020 22:50:35 +0100
Going back to your attempt: I think that the predicate in-math? cannot be
used to check whether the typesetter is working on an equation or not. No
information is passed to Scheme about the internal status of the typesetter
when you call a \extern markup. You can pass informations only via
parameters. So your unitSpacer has no way to know if the evaluation is inside
some math markup or not.

The predicates in-math?, etc.. are just to check if the editor is in text,
prog, or math mode, for example. Thats is completely separate on the status
of the typesetter.

HTH,

Max



> On 17. Nov 2020, at 19:25, Giovanni Piredda <address@hidden> wrote:
>
> I post this here because I think that while being about Scheme in TeXmacs
> is still of general interest. I have found a way of circumventing both
> issues (which may be ok, in case I will ask about this in another post) but
> I am curious to know the reason of the behaviours I observe.
>
> First issue.
>
> I have defined a Scheme function with the following:
>
> (tm-define (unitSpacer) ; default, will be used in regular text
> `(hspace "0.5spc"))
> (tm-define (unitSpacer)
> (:require (in-math?))
> "*")
>
> As far as I understand, the first definition is the default and it is
> overridden by the second when I am in math.
>
> In my tests, this happens only in open documents. At the first opening of a
> document, only the first definition is used. Does anyone have a hint on
> what is happening? Developers ;-) ?
>
> ===
>
> Second issue.
>
> In math mode, the program I wrote outputs groups of letters, each wrapped
> in a <with|math-font-shape|right primitive, and interleaved with the
> character "*".
>
> Example of output, copied from the terminal using (display ...)
>
> <tree 2 <with|math-font-shape|right|kg>*<with|math-font-shape|right|m>>
>
> I call this from a TeXmacs macro in math mode and I get a typeset output
> where the asterisk appears as such (while I would like it to be interpreted
> as an implicit multiplication)
>
> If I copy the output from the terminal, strip the outermost <tree primitive
> and place it inside a math primitive (opening the .tm file with a text
> editor) the asterisks do not appear (as I thought they shouldn't).
>
> Again, suggestions?
>
>


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