Saturday, July 2, 2011

Using TeX to merge \input from top level files

This is silly. There are better ways to do it. Still, it was sort of fun to write.
\endlinechar=-1
\newread\in
\newwrite\out
\message{Please enter input file name: }
\read16to\inname
\openin\in=\inname \relax
\ifeof\in
        \immediate\write16{Failed to open \inname.}
        \expandafter\end
\fi
\message{Please enter output file name: }
\read16to\outname
\immediate\openout\out=\outname \relax
\begingroup
\catcode`@0
\catcode`(1
\catcode`)2
\catcode`\{12
\catcode`\}12
\catcode`I12
\catcode`N12
\catcode`P12
\catcode`U12
\catcode`T12
\catcode`\\12
@lowercase(
        @gdef@dosplitline#1\INPUT{#2}#3@splitsentinal(@def@ante(#1)@def@file(#2)@def@post(#3))
        @gdef@splitline(@expandafter@dosplitline@line\INPUT{@sentinal}@splitsentinal)
)
@endgroup
\def\splitpost{\expandafter\dosplitline\post\splitsentinal}
\def\sentinal{\sentinal}
\catcode`\%12
\def\processline{
        \ifx\file\sentinal
                \immediate\write\out{\ante}
                \let\temp\relax
        \else
                \immediate\write\out{\ante%}
                \let\temp\processline
                \copyfile
                \splitpost
                \ifx\empty\ante
                        \ifx\file\sentinal
                                \let\temp\relax
                        \fi
                \fi
        \fi
        \temp
}
\newread\f
\def\copyfile{
        \openin\f=\file\relax
        \ifeof\f
                \immediate\write16{Failed to open \file. Continuing.}
        \else
                \begingroup
                \loop
                        \readline\f to\line
                        \unless\ifeof\f
                        \immediate\write\out{\line}
                \repeat
                \endgroup
                \closein\f
        \fi
}

\loop
        \readline\in to\line
        \unless\ifeof\in
        \splitline
        \processline
\repeat
\closein\in
\immediate\closeout\out
\end

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