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

[Henri Menke <henrimenke@gmail.com>]

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}

> 
> and use \MATH{....} instead of \m{....}.
> 
> I'll test this is a bit, and if the solution is robust, then I will map 
> \m{...} to something equivalent to the above in the t-vim environments.
> 
> 
> Aditya
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