Re: t-vim module: math in "normal" code and background color

[Aditya Mahajan <adityam@umich.edu>]

On Wed, 19 Jul 2017, Gerion Entrup wrote:

> Am Mittwoch, 19. Juli 2017, 21:07:09 CEST schrieb Aditya Mahajan:
>> On Wed, 19 Jul 2017, Gerion Entrup wrote:
>> 
>> > Am Dienstag, 18. Juli 2017, 04:04:51 CEST schrieb Aditya Mahajan:
>> >> On Mon, 17 Jul 2017, Gerion Entrup wrote:
>> >>
>> >>> Hi,
>> >>>
>> >>> I have two questions with the vim module.
>> >>>
>> >>> 1. I want to use the math mode inside the code. I've seen the escape option,
>> >>> e.g. here [1], but this seems to work only with comments. Is there a
>> >>> possibility to use it directly in the code, too?
>> >>
>> >> Short answer. No.
>> >>
>> >> Long answer. t-vim relies on vim to syntax highlight the code. Since the
>> >> code is not valid python, the default python syntax highlighting will not
>> >> work. In principle, it is possible to write a vim syntax highlighting
>> >> script for a derivative of python where math terms are allowed, but that
>> >> requires a lot of work for each language. The whole point of t-vim module
>> >> was that I am lazy and don't want to write the parser for each language
>> >> :-)
>> >
>> > I've invested some time and rewrote parts of the vimscript file of t-vim.
>> > Now one or more escapechars can be defined, that helps vim to not interpret
>> > the text:
>> 
>> I'll look at this later....
>> 
>> > Another point I saw is, that highlight together with TeX-code is not really usable:
>> > ```
>> > \usemodule[vim]
>> > \definevimtyping[python][syntax=python, escape=on]
>> >
>> > \starttext
>> > \startpython[highlight=1]
>> > # Returns \m{\sum_{i=1}^{n}i \in F \int_i f}
>> > \stoppython
>> > \stoptext
>> > ```
>> 
>> By default, the highlighting is done using the bars mechanism. It works 
>> for simple cases but fails with math mode (the spaces are not covered). 
>> One option is to highlight using the textbackground mechanism:
>> 
>> \definetextbackground[texthighlight]
>>      [
>>        background=color,
>>        backgroundcolor=gray,
>>        frame=off,
>>      ]
>> 
>> \define[1]\texthighlight{\starttexthighlight#1\stoptexthighlight}
>> 
>> \usemodule[vim]
>> \definevimtyping[python][syntax=python, escape=on, highlightcommand=\texthighlight]
>> 
>> \starttext
>> 
>> \startpython[highlight=3]
>> for x in 1:n
>>    print(x)
>> # Returns \m{\sum_{i=1}^{n}i \in F \int_i f}
>> for x in 1:n
>>    print(x)
>> \stoppython
>> \stoptext
> Thank you, this works much better (critic on high level: the sum symbol is
> higher than the highlight box, relevant on fractions).

Another option (slightly better visually, but increases the interline 
distance)

\defineframed[texthighlight]
     [
       background=color,
       backgroundcolor=gray,
       frame=off,
       location=middle,
     ]

\usemodule[vim]
\definevimtyping[python][syntax=python, escape=on,
highlightcommand=\dontleavehmode\texthighlight]

\starttext

\startpython[highlight=3]
for x in 1:n
   print(x)
# Returns \m{\sum_{i=1}^{n}i \in F \int_i f}
for x in 1:n
   print(x)
\stoppython
\stoptext

Aditya
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