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% pdfwebtofront.tex
% Code from knuth.drv in https://github.com/oberdiek/latex-tds
% 2020/05/21 v1.0 by Andreas Scherer.
%
% This file is part of project https://github.com/ascherer/cwebbin
% and may be distributed under the MIT License or the LaTeX Project
% Public License.
%
% Move table-of-contents page to the front in PDF output.
% Works with pdftex and xetex in connection with either 'webmac.tex'
% for Pascal/WEB programs or 'cwebmac.tex' for C/CWEB programs.
%
\ifx\detokenize\undefined\endinput\fi
\def\contentsfile{\jobname.toc} % file that gets table of contents info
\def\readcontents{\input \contentsfile}
\newread\testread
\openin\testread=\contentsfile\relax
\ifeof\testread % First run
\else % Second run
% Redefine '\con' to be invoked before the first '\N' (starred section).
\let\ORGcon\con
\def\con{%
\def\:{\par\hangindent 2em} % Fix for 'bibtex.web'.
% reduce size of PDF pages for more screen space
\pdfpagewidth=\pagewidth \advance\pdfpagewidth by 2cm
\pdfpageheight=\pageheight \advance\pdfpageheight by 3cm
\ifpdftex \pdfhorigin=1cm \pdfvorigin=1cm
\else \advance\pdfpageheight by 1cm \global\pageshift=-1.54cm
\global\hoffset=-1.54cm \global\voffset=-1.54cm \fi
\begingroup
\let\end\relax
\ORGcon
% let's start with section '1', the 'Introduction'.
\ifx\undefined\grouptitle \mark{1} % WEB
\else \mark{{{\tensy x}1}0{Introduction}}\fi % CWEB
\eject % set '\botmark' on TOC, hence '\topmark' on next page.
\endgroup
\let\con\end
}%
% Redefine '\N’ to invoke redefined '\con' before switching back
% to original '\N'.
\expandafter\let\csname ORGN\expandafter\endcsname
\csname N\endcsname
\expandafter\outer\expandafter\def\csname N\endcsname{%
\con
\expandafter\let\csname N\expandafter\endcsname
\csname ORGN\endcsname
\csname N\endcsname
}%
% Special variant of the above for 'mf.web' and 'tex.web'. They put
% their tables-of-contents on a sparce 'page 2' and start on page '3'.
\begingroup
\def\num{0}%
\edef\x{\jobname}%
\edef\y{\detokenize{tex}}%
\ifx\x\y \def\num{1}\else
\edef\y{\detokenize{mf}}%
\ifx\x\y \def\num{1}\else
\edef\y{\detokenize{pdftex}}%
\ifx\x\y \def\num{1}\else
\edef\y{\detokenize{xetex}}%
\ifx\x\y \def\num{1}\fi\fi\fi\fi
\expandafter\endgroup\ifnum\num=1 %
\def\contentspagenumber{2}%
\let\ORGpageno\pageno
\def\pageno{%
\let\pageno\ORGpageno
\expandafter\let\csname ORGN\expandafter\endcsname
\csname N\endcsname
\expandafter\outer\expandafter\def\csname N\endcsname{%
\con
\expandafter\let\csname N\expandafter\endcsname
\csname ORGN\endcsname
\csname N\endcsname
}%
\pageno
}%
\fi
\fi
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