Re: Collecting command arguments in a startstop environment

[Brooks Moses <bmoses@stanford.edu>]

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.

- Brooks