combining start/stop environments

combining start/stop environments

[Guy Worthington]

Hello,

I'd like to introduce new code by highlighting it with a background.
For instance the following snippet of code does what I want:

-----
\starttext

\input tufte

\setupcolors[state=start]

\startbackground
\startJV
import java.io.IOException ; 

import org.xml.sax.SAXException ; 
\stopJV 
\stopbackground

\input tufte

\stoptext
-----

I'd like to get the two nested environments startbackground/startJV,
grouped together under a single concept, in this case the single
concept startNewCode.  

I thought I'd just slurp up the argument nested between the keywords
\startNewCode and \stopNewCode into memory and then process the
argument.  This is my attempt:

-----
\definetype [typeJV]  [option=JV,palet=graypretty]

\def\startNewCode{\blank[medium]
                  \begingroup
                  \catcode`\\=12
                  \STARTNewCode}
{ \catcode`\|=0 \catcode`\\=12 
  |long|gdef|STARTNewCode#1\stopNewCode{%
    |startbackground 
    |typeJV{#1}
    |stopbackground
    |blank[medium]
    |endgroup}}

\starttext

\input tufte

\startNewCode
import java.io.IOException ; 

import org.xml.sax.SAXException ; 
\stopNewCode

\input tufte

\stoptext
-----

This unfortunately doesn't work.  It gets rid of blank lines and
doesn't pretty-print.  I realize my attempt is naive, but I've run out
of ideas of how to combine a background with a verbatim argument.

Re: combining start/stop environments

[Patrick Gundlach]

Guy Worthington <guyw@multiline.com.au> writes:

Hi,


[...]

> I'd like to get the two nested environments startbackground/startJV,
> grouped together under a single concept, in this case the single
> concept startNewCode.  

what about this?

\starttext
\input tufte
\setupcolors[state=start]

\definetyping[NewCode][before=\startbackground,
                       after=\stopbackground,
                       option=JV]

\startNewCode
import java.io.IOException ; 

import org.xml.sax.SAXException ; 
\stopNewCode
\input tufte

\stoptext

> I thought I'd just slurp up the argument nested between the keywords
> \startNewCode and \stopNewCode into memory and then process the
> argument.  This is my attempt:

... too complicated for me :) If the above does not do what you need,
say so. Perhaps I will look closer. But verbatim code look rather
tricky to me, all those 1000 options for prettyprinting are confusing
me.



Patrick

Re: combining start/stop environments

[Guy Worthington]

Patrick wrote
> Guy wrote:

>> [a convoluted method to combine a background with pretty-printing
>> environment]

> what about this?

> \definetyping[NewCode][before=\startbackground,
>                        after=\stopbackground,
>                        option=JV]

That's the effect I'm after.  It looks so obvious, now I've seen the
answer.

Thanks Patrick

Re: combining start/stop environments

[Patrick Gundlach]

Guy Worthington <guyw@multiline.com.au> writes:

Hi,

> That's the effect I'm after.  It looks so obvious, now I've seen the
> answer.

It's simple, isn't it? I was trying some low level ConTeXt hacking
and after a while I came across this commmand, and I said to myself:
Lucky me that I did not post some of this ugly TeX hack to the list...

It happens to me so often that I do some ugly stuff in ConTeXt and
after a while I find out that there is already some high level
interface for it. 

Patrick