Re: Collecting command arguments in a startstop environment

[Hans Hagen Outside <pragma@wxs.nl>]

Brooks Moses wrote:

> To answer my own question:
>
> At 10:39 PM 8/1/2004, I wrote:
>
>> There's a nice little problem that arises in LaTeX, of wanting to 
>> write a bit of code like the following, to define an environment that 
>> passes the contents of the environment to a command as an argument:
>>
>>   \newcommand{\foo}[1]{...}
>>   \newenvironment{fooenv}{%
>>     \foo\bgroup
>>   }{%
>>     \egroup
>>   }
>>
>> There's even a nice FAQ entry about this. [1]  As it turns out, the 
>> amsmath package defines a handy \collect@body command that handles 
>> collecting the environment body to pass it to a command.
>>
>> Anyhow, I'm finding myself wanting to do this in ConTeXt, with of 
>> course replacing \newenvironment with \definestartstop.  Is there by 
>> any chance a built-in ConTeXt macro that can do this?  Or even things 
>> that would make a decent foundation for building such a thing?
>
>
> The \grabuntil and \processbetween commands, as defined in 
> syst-ext.tex, do exactly what I'm asking for.

If you want to play with low level features, it makes sense to look into:  

syst-gen.tex
syst-ext.tex 
(syst-new.tex)
supp-box.tex
supp-fun.tex

the interfaces of syst/supp modules are sort of 'public' and stable. These modules may also teach some tex tricks -) 
 
Hans 


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