[texhax] macro expansion and \input

Philip TAYLOR P.Taylor at rhul.ac.uk
Mon Oct 1 12:38:37 CEST 2012

Neal H. Walfield wrote:

> Based on this observation, I tried to preexpand \input's argument:
>    \documentclass{article}
>    \begin{document}
>    % My general-purpose macro.
>    \def\mutate#1{
>      \def\helper{#1}
>      \helper
>    }
>    \def\myinput#1{
>      \edef\filename{#1}
>      \input{\filename}
>    }
>    \myinput{\mutate{23}}
>    \end{document}
> But, this results in a different error:

Neal, as you do not give us any information as to exactly how
you want to mutate the filename, I cannot be certain that the
following will work, but for my simple version which just
prepends the letter "X" it seems adequate.  It is based
on your \myinput, but puts /all/ of the functionality there
rather than requiring \mutate to be passed as a part of
the parameter string.

Philip Taylor
   \documentclass {minimal}


   \def \mutate #1{X#1}
   \def \myinput #1%
     \edef \filename {\mutate {#1}}%
     \input {\filename}%



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