[tex-live] Nested macro resetting problem

[Geoff Russell]

On 6/14/09, enrico.gregorio at univr.it <enrico.gregorio at univr.it> wrote:
> This is not the right place for this kind of problems; however, here is a different solution.

Apologies and thanks for the different solution. I don't know latex
internals well
enough to understand it fully, but well enough to use it. Thanks.

Cheers,
Geoff.

>  All commands are defined globally, because an abbreviation's first use in a chapter might
>  be in a group. You should probably add a meaningful error message
>
>  ===
>  \documentclass[a4paper]{book}
>  %%% here are the relevant definitions
>  \makeatletter
>  \newtoks\abbr at list % a hook where we memorize all the definitions
>  \def\newabbr#1#2{%
>   \@ifundefined{#1}
>     {\addto at hook\abbr at list{\global\@namedef{#1}/{#2\global\@namedef{#1}/{#1}}}}%
>     {\errmessage{Ouch}}%
>  }
>  % a patch to the \chapter command, to execute again all the definitions
>  \toks@=\expandafter{\chapter}
>  \edef\chapter{\noexpand\the\abbr at list\the\toks@}
>  % define the abbreviations for the first time, just to be safe
>  \AtBeginDocument{\the\abbr at list}
>  \makeatother
>  %%% end of the definitions
>
>  \newabbr{TUG}{\TeX\ Users Group}
>  \newabbr{XYZ}{Xy Yz Zu}
>
>  \begin{document}
>  ...
>  \chapter{A title}
>  \TUG/ is expanded; now \TUG/ is not. The same for \XYZ/ and \XYZ/.
>  \chapter{A title}
>  \TUG/ is expanded; now \TUG/ is not. The same for \XYZ/ and \XYZ/.
>  \end{document}
>
>  Ciao
>  Enrico
>
>
>  --
>  Enrico Gregorio          + Dipartimento di Informatica          + Tel: +39 045 8027937
>  Enrico.Gregorio at univr.it + Università degli Studi di Verona     +
>  (gregorio at math.unipd.it) + Strada le Grazie 15 / I-37134 Verona + Fax: +39 045 8027928
>


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