Re: mkiv: append to buffer

[Aditya Mahajan <adityam@umich.edu>]

On Sat, 18 Dec 2010, Thomas Schmitz wrote:

> i guess this is easy, but I can't find an example to help
> me: I want to write a macro that will collect one of its
> arguments in a buffer and then collect the other argument in a buffer. 
> Difficult to make a minimal example since I don't know how to do this, so 
> here is some pseudo-code; this is what I want to achieve:
>
> \definebuffer[MyBuffer]
>
> \def\MyGreatMacro#1#2#3%
> {\item[#1] #2 \par
> \appendtobuffer{MyBuffer}{\in[#1] #3}}
>
> \starttext
> \startitemize
> \MyGreatMacro{1}{aa}{AA}
> \MyGreatMacro{2}{bb}{BB}
> \stopitemize
>
> \page
> \getbuffer[MyBuffer]
> \resetbuffer[MyBuffer] % so I can reuse the buffer
> \stoptext
>
> What I want to do with this is typeset exercises for my students, with an 
> itemization for problems and solutions which use the same numbering. In real 
> life, this will involve xml, but I will try and figure that out myself once I 
> know how to use buffers...
>
> It looks like buffers.collectcontent should be able to do this, but I can't 
> figure out how to use it. Any pointers? Thanks a lot!

I am not sure what you want to do, and why you want to use buffers. Wont a 
simple token list work?

% Define a token list
\newtoks\mytoks

% Append to a token list
\appendtoks \in[#1] #3  \to\mytoks

% Recall a token list
\the\mytoks

% Reset a token list
\mytoks\emptytoks

For repeating question and answers, there is also blocks.

Aditya

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