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

[Aditya Mahajan <adityam@umich.edu>]

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On Thu, 20 Jul 2017, Henri Menke wrote:

> On Wed, 2017-07-19 at 15:07 -0400, Aditya Mahajan wrote:
>> 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
>> 
>> The spacing in math mode is bad. What is happening is the following. To 
>> make sure that spaces are obeyed in the code listing, I set (a modified 
>> version of) \activatespacehandler{on}, so the output that you get is the 
>> following:
>> 
>> {\obeyspaces
>>   \def\obeyedspace{\hskip\interwordspace\relax}
>> \m{\sum_{i=1}^{n}i \in F \int_i f}}
>> 
>> The simplest way to fix this is to define a new command:
>> 
>> \define[1]\MATH{\bgroup\activatespacehandler{off}\m{\rescan{#1}}\egroup}
>
> Why not just this?
>
> \def\obeyedspace{\ifmmode\else\hskip\interwordspace\relax\fi}

That's a good suggestion and will be easier to incorporate in t-vim.

Thanks,
Aditya

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