[texhax] Large Project

Philip TAYLOR P.Taylor at Rhul.Ac.Uk
Wed Dec 23 22:31:42 CET 2009

Aditya Mahajan wrote:

> Another option with plain TeX is that, in addition to having a separate
> tex file for each chapter, also more all your macros to a separate file,
> say preamble.tex. Then, in preamble.tex define a macro
> \def\mypreambleloaded{\relax}
> and start the individual chapter files by
> \ifx\undefined\mypreambleloaded \input preamble \fi
> Then you can compile each file individually without making any changes
> in the sources.

Well, if you're going that route, you could put the intelligence
into the preamble itself :

% Preamble.TeX

\ifx \csname preamble already loaded\endcsname \relax
      \message {Preamble loading ...}
      \edef \next
          {\let \csname preamble already loaded\endcsname
              = \noexpand \empty
      \message {Preamble already loaded.}
      \let \next = \endinput

<remainder of preamble>

and then each chapter file need simply \input Preamble


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