Re: \stopbuffer in macro

[Taco Hoekwater <taco@elvenkind.com>]

Peter Münster wrote:
> Hello,
> 
> how could I build some macros, that make usage of \startbuffer and
> \stopbuffer?
> Example:
> \def\startXXX[#1]{\doSomeMagicSetups{#1}%
>   \startbuffer[...]}
> \def\stopXXX{\stopbuffer
>   \doSomeSpecialWorkHere}
> And then:
> \startXXX[some options]
> some text
> \stopXXX

I hope this helps:

%%%%%%%%%%%%%%%%%% buf.tex
% use colors
\setupcolors[state=start]

% this defines a new type of buffer called XXX, so that
% the commands \startXXX ... \stopXXX, \getXXX and
% \typeXXX are now defined

\definebuffer[XXX]

% two sentinel definitions are placed before and after
% the actual buffer content, as fetched by \getXXX

\setupbuffer[XXX][before={\beforeXXX},after={\afterXXX}]

% Do not call \getXXX directly, but use a special
% command to pass options to \beforeXXX and \afterXXX

\def\finishXXX{\dosingleempty\dofinishXXX}
\def\dofinishXXX[#1]{{\getparameters[XXX][Color=green,#1]\getXXX }}

% within the next commans, there is now a set if parameters
% starting with \XXX, initialized by the \getparameters
% call in the macro above.

\def\beforeXXX{\startcolor[\XXXColor]}
\def\afterXXX{\stopcolor}

% below here is an example

\starttext
\startXXX
   Here is some text
\stopXXX

\finishXXX % defaults to using green text.

\finishXXX[Color=blue] % same text, but in blue

\stoptext
%%%%%%%%%%%%%%%%%%% buf.tex