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% pdfwebtofront.tex
% Code from knuth.drv in https://github.com/oberdiek/latex-tds
% 2020/06/20 v2.0 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
\newif\iftexmf\texmffalse % special toc treatment for TeX, Metafont, etc.
\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{%
% 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
\endgroup
\let\con\end
}%
% Special variant for 'mf.web' and 'tex.web' (et al.).
% They all define a peculiar version of '\N' in their preamble.
% And they put their tables-of-contents on a sparse 'page 2' and
% start the main body on page '3'.
\edef\x{\jobname}%
\edef\y{\detokenize{tex}}%
\ifx\x\y \texmftrue\else
\edef\y{\detokenize{mf}}%
\ifx\x\y \texmftrue\else
\edef\y{\detokenize{pdftex}}%
\ifx\x\y \texmftrue\else
\edef\y{\detokenize{xetex}}%
\ifx\x\y \texmftrue\fi\fi\fi\fi
\iftexmf
\expandafter\let\csname ORGN\expandafter\endcsname
\csname N\endcsname
\expandafter\outer\expandafter\def\csname N\endcsname{%
\titletrue \con \pageno=2
\expandafter\let\csname N\expandafter\endcsname
\csname ORGN\endcsname
\csname N\endcsname
}%
\else % Much more general approach for WEB and CWEB programs.
% In fact, '\con' will be invoked _inside_ the first '\N' right _after_
% '\MN', but _before_ '\eject'. And '\topofcontents' gets in the twist
% as well.
\let\ORGtopofcontents\topofcontents \let\ORGrheader\rheader
\def\topofcontents{%
\def\:{\par\hangindent 2em} % Fix for 'bibtex.web'; from '\def\fin'.
\ORGtopofcontents
\let\topofcontents\relax
}%
% Squeeze '\con' between '\MN' and '\eject' in the very first '\N'.
\expandafter\let\csname ORGvfil\expandafter\endcsname
\csname vfil\endcsname
\expandafter\let\csname ORGeject\expandafter\endcsname
\csname eject\endcsname
\expandafter\outer\expandafter\def\csname vfil\endcsname{%
\let\eject\relax
\titletrue % prepare to output the table of contents
\topofcontents \con
\advance\pageno by -1\relax
\expandafter\let\csname vfil\expandafter\endcsname
\csname ORGvfil\endcsname
\expandafter\let\csname eject\expandafter\endcsname
\csname ORGeject\endcsname
\vfil\eject
\let\rheader\ORGrheader
}%
\fi
\fi
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