?SPAM? - [texhax] choice of documentstyle upon \jobname

Philip TAYLOR P.Taylor at Rhul.Ac.Uk
Thu Dec 1 00:13:11 CET 2005

This one is quite nasty ...

Susan Dittmar wrote:

> Hi all,
> I would like to choose the documentclass (in fact, only some of the
> documentclass options) according to \jobname. I tried something like
> \ifx\jobname{first}
> 	\documentclass[first]{...}
> \else
> 	\documentclass[second]{...}
> \fi
> (and some variations thereof), but somehow it never uses the first
> set of options even when \typeout{\jobname} yields 'first'.
> Where's my mistake?

Lots of mistakes, but don't worry about them, the problem
is distinctly non-trivial.  See Victor Eijkhout's magnificent
/TeX by Topic/ for the gory details :


but in the meantime here's the guts of a solution
(just replace "True" and "False" by whatever you
want to happen).  Note that the target filename
for this example is "DocClass.tex" : you'll need
to change the embedded string if you want to test
for a different name, or add more strings if you
want to test for multiple possibilities.

Philip Taylor

\def \0%
      \def \1{\gdef \thisname}
      \count 0 = 0
           \catcode \count 0 = 12
      \ifnum \count 0 < 255
           \advance \count 0 by 1
      \catcode `\\ = 0
      \catcode `\{ = 1
      \catcode `\} = 2

\def \2%


\edef \ThisName {\thisname}
\edef \JobName {\jobname}

\ifx \ThisName \JobName


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