Merge branch 'master' of /home/mdw/public-git/strayman

[strayman] / strayman.dtx

% \begin{meta-comment}
%
% $Id: strayman.dtx,v 1.4 2003/11/07 11:32:53 mdw Exp $
%
% Document class for Straylight manuals
%
% (c) 1996 Straylight
%
% \end{meta-comment}
%
% \begin{meta-comment} <general public licence>
%%
%% strayman -- a LaTeX document class for Straylight manuals
%% Copyright (c) 1996 Straylight
%%
%% This program is free software; you can redistribute it and/or modify
%% it under the terms of the GNU General Public License as published by
%% the Free Software Foundation; either version 2 of the License, or
%% (at your option) any later version.
%%
%% This program is distributed in the hope that it will be useful,
%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%% GNU General Public License for more details.
%%
%% You should have received a copy of the GNU General Public License
%% along with this program; if not, write to the Free Software
%% Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
%%
% \end{meta-comment}
%
% \begin{meta-comment} <Package preamble>
%<+strayman>\NeedsTeXFormat{LaTeX2e}
%<+strayman>\ProvidesClass{strayman}
%<+strayman>              [2003/09/04 1.10 Straylight document class]
% \end{meta-comment}
%
% \CheckSum{2936}
%% \CharacterTable
%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%%   Digits        \0\1\2\3\4\5\6\7\8\9
%%   Exclamation   \!     Double quote  \"     Hash (number) \#
%%   Dollar        \$     Percent       \%     Ampersand     \&
%%   Acute accent  \'     Left paren    \(     Right paren   \)
%%   Asterisk      \*     Plus          \+     Comma         \,
%%   Minus         \-     Point         \.     Solidus       \/
%%   Colon         \:     Semicolon     \;     Less than     \<
%%   Equals        \=     Greater than  \>     Question mark \?
%%   Commercial at \@     Left bracket  \[     Backslash     \\
%%   Right bracket \]     Circumflex    \^     Underscore    \_
%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%%   Right brace   \}     Tilde         \~}
%%
%
% \begin{meta-comment} <driver>
%
%<*driver>
\documentclass[10pt,a4paper,times,cmtt]{strayman}
\input{mdwtools}
\usepackage{mdwlist}
\describesclass{strayman}
\title[The \strayman\ document class]
      {The \strayman\footnote{The \strayman\ document class is currently %
       at version \mdwfileinfo{strayman.cls}{version}, dated %
       \mdwfileinfo{strayman.cls}{date}.} {} document class}
\newenvironment{syndisplay}{\display\synshorts}{\enddisplay}
\DeclareRobustCommand\strayman{\package{strayman}}
\mdwdoc
%</driver>
%
% \end{meta-comment}
%
% \chapter{About the \strayman\ document class}
%
% The standard \LaTeX\ document classes are all very well for simple
% documents, but the style isn't appropriate for works like manuals.
% The \strayman\ document class is an attempt to recitfy this situataion,
% providing an attractive and distinctive style for Straylight documents.
% The layout is based on an earlier style built for \emph{Impression}
% documents, although many improvements have been made.  This document
% was typeset using \strayman, and it demonstrates the design far better
% than I can describe it.
%
%
% \section{Document class options}
%
% The document class provides many options, most of which are taken from
% the standard \LaTeX\ classes.
%
% \begin{description}
% \def\|{\ensuremath\vert}
%
% \item [\texttt{a4paper} \| \texttt{a5paper} \| \texttt{b5paper} \|
%       \texttt{letterpaper} \| \texttt{legalpaper} \|
%       \texttt{executivepaper}]  Select the output paper size.  Since
%       \strayman\ is intended to be used mainly for manuals, the default
%       size is |a5paper|.
%
% \item [\texttt{landscape}]  Swaps the width and height of the paper.
%       Probably not much use, to be honest.
%
% \item [\texttt{9pt} \| \texttt{10pt} \| \texttt{11pt} \| \texttt{12pt}]
%       Selects the basic type size for the document.  The |9pt| option is
%       nonstandard, but it is the default, since larger sizes don't work
%       well on A5~paper.
%
% \item [\texttt{text}]  Sets up the page layout and fonts so that the
%       output can be converted fairly easily into a raw text file.
%
% \item [\texttt{oneside} \| \texttt{twoside}]  Selects one- or two-sided
%       page layouts.  Note that one-sided output doesn't look too good.
%
% \item [\texttt{draft} \| \texttt{final}]  Select various options for draft
%       or final copy.
%
% \item [\texttt{titlepage} \| \texttt{notitlepage}]  Selects whether
%       the |\maketitle| displays its output on a separate title page.
%
% \item [\texttt{openright} \| \texttt{openany}]  Select whether chapters
%       start only on quarto pages, or any page.  The default is |openright|.
%
% \item [\texttt{onecolumn} \| \texttt{twocolumn}]  Choose whether the
%       main body text is set in one or two columns.  Note that this uses
%       \LaTeX's built-in column handling, not the \package{multicol}
%       package.
%
% \item [\texttt{leqno}]  Put the equation numbers on the left, not the
%       right.
%
% \item [\texttt{fleqn}]  Typeset displayed equations left aligned.
%
% \item [\texttt{openbib}]  Use the `open' style for the bibliography.
%
% \item [\texttt{article}]  Change the formatting slightly, in a way more
%       suited to short documents.
%
% \item [\texttt{square} \| \texttt{rounded}]  These options are passed
%       directly to the \package{syntax} package, when it's loaded.
%
% \item [\texttt{helvetica}]  Typeset headings in the Helvetica font,
%       not in Computer Modern.
%
% \item [\texttt{palatino}]  Typeset the main body text in Palatino, and
%       headings in Helvetica.  The |\tt| font is changed to Courier, but
%       see the \texttt{cmtt} option.
%
% \item [\texttt{times}]  Typeset the main body text in Times, and headings
%       in Helvetica.  The |\tt| font is changed to Courier, but see the
%       \texttt{cmtt} option.
%
% \end{description}
%
%
% \section{The \texttt{text} option}
%
% In order to facilitate creation of attractively formatted text files
% from \LaTeX\ documents, \strayman\ provides a |text| option.  This will
% set up \emph{all} the fonts to be monospaced, in the same size.  The page
% size is set up to be a multiple of the character size.  The command
% \begin{syndisplay}
% "dvi2tty -e-17" <filename>
% \end{syndisplay}
% appears to produce a reasonable output from a DVI file created in this
% way.  The output will need to be formatted and corrected slightly by hand
% although there's a good deal less work to do than might be required
% otherwise.
%
%
% \section{That's it}
%
% That's all I'm writing for now.  It's a document class.  It defines the
% style.  What more do you expect?
%
%
% \implementation
%
% \chapter{Implementation}
%
% \section{Options handling}
%
% From here on, a lot of the code is shamelessly borrowed from
% \file{book.cls} and other places.  This is what code re-use is for.
%
% This bit handles all the options on the |\documentclass| command, either
% altering our own internal arguments, or loading other packages as
% appropriate.
%
% \subsection{Set up some defaults}
%
% We create some variables to hold the settings, and initialise them to
% sensible values.
%
%    \begin{macrocode}
%<*strayman>
\newcommand\@ptsize{}
\newif\if@restonecol\@restonecolfalse
\newif\if@titlepage\@titlepagetrue
\newif\if@openright\@openrighttrue
\newif\if@openbib\@openbibfalse
\newif\if@appendix\@appendixfalse
\newif\if@article\@articlefalse
\newif\if@offsetpages\@offsetpagestrue
\newif\if@numbering\@numberingfalse
\newif\if@herefloats\@herefloatstrue
\newif\if@runinsubsubsec\@runinsubsubsecfalse
\newdimen\pagesurround
\let\headfam\rmfamily
\let\pad@margin\@empty
\def\@delayed{}
\def\@delaycode#1{%
  \expandafter\def\expandafter\@delayed\expandafter{\@delayed#1}%
}
%    \end{macrocode}
%
% \subsection{Declare the options we support}
%
% This is just a tedious list of all the options.
%
%    \begin{macrocode}
\DeclareOption{a4paper}{%
  \paperheight297mm%
  \paperwidth210mm%
  \pagesurround1in%
}
\DeclareOption{a5paper}{%
  \paperheight210mm%
  \paperwidth148mm%
  \pagesurround12mm%
}
\DeclareOption{b5paper}{%
  \paperheight250mm%
  \paperwidth176mm%
  \pagesurround1in%
}
\DeclareOption{letterpaper}{%
  \paperheight11in%
  \paperwidth8.5in%
  \pagesurround1in%
}
\DeclareOption{legalpaper}{%
  \paperheight14in%
  \paperwidth8.5in%
  \pagesurround1in%
}
\DeclareOption{executivepaper}{%
  \paperheight10.5in%
  \paperwidth7.25in%
  \pagesurround1in%
}
\DeclareOption{landscape}{%
  \@tempdima\paperheight%
  \paperheight\paperwidth%
  \paperwidth\@tempdima%
}
\DeclareOption{8pt}{\renewcommand\@ptsize{8pt}}
\DeclareOption{9pt}{\renewcommand\@ptsize{9pt}}
\DeclareOption{10pt}{\renewcommand\@ptsize{10pt}}
\DeclareOption{11pt}{\renewcommand\@ptsize{11pt}}
\DeclareOption{12pt}{\renewcommand\@ptsize{12pt}}
\DeclareOption{text}{%
  \renewcommand\@ptsize{text}%
  \setbox\z@\hbox{\texttt{M\strut}}%
  \newdimen\tt@chw\tt@chw\wd\z@%
  \newdimen\tt@chh\tt@chh\ht\z@\advance\tt@chh\dp\z@%
  \paperwidth77\tt@chw%
  \paperheight60\tt@chh%
  \raggedright%
  \def\pad@margin{.}
}
\DeclareOption{oneside}{\@twosidefalse \@mparswitchfalse}
\DeclareOption{twoside}{\@twosidetrue  \@mparswitchfalse \reversemarginpar}
\DeclareOption{draft}{\overfullrule5\p@}
\DeclareOption{final}{\overfullrule\z@}
\DeclareOption{titlepage}{\@titlepagetrue}
\DeclareOption{notitlepage}{\@titlepagefalse}
\DeclareOption{openright}{\@openrighttrue}
\DeclareOption{openany}{\@openrightfalse}
\DeclareOption{onecolumn}{\@twocolumnfalse}
\DeclareOption{twocolumn}{\@twocolumntrue}
\DeclareOption{offsetpages}{\@offsetpagestrue}
\DeclareOption{nooffsetpages}{\@offsetpagesfalse}
\DeclareOption{herefloats}{\@herefloatstrue}
\DeclareOption{noherefloats}{\@herefloatsfalse}
\DeclareOption{leqno}{\input{leqno.clo}}
\DeclareOption{fleqn}{\input{fleqn.clo}}
\DeclareOption{openbib}{\@openbibtrue}
\DeclareOption{article}{\@articletrue}
\DeclareOption{numbering}{\@numberingtrue}
\DeclareOption{nonumbering}{\@numberingfalse}
\DeclareOption{runinsubsubsec}{\@runinsubsubsectrue}
\DeclareOption{noruninsubsubsec}{\@runinsubsubsecfalse}
%    \end{macrocode}
%
% \subsection{Set up the options}
%
% We set up some default options, and then read the user's.
%
%    \begin{macrocode}
\ExecuteOptions{a5paper,8pt,twoside,onecolumn,final,openright}
\ProcessOptions
%    \end{macrocode}
%
% If this is PDF\TeX\ then tell it the page bounds.
%
%    \begin{macrocode}
\@ifundefined{pdfpageheight}{
  \relax
}{
  \pdfpageheight\paperheight
  \pdfpagewidth\paperwidth
}
%    \end{macrocode}
%
% \subsection{Read in the text size option}
%
% The text sizing is rather messy.  We store this in a separate file.  To
% keep this stuff away from other classes, we use the file \emph{extension}
% as the size specifier, rather than the filename, which is the normal
% \LaTeX\ way of doing this.  This is a \riscos\ thing mainly: I don't like
% loads of directories cluttering up my disk, and it means that I can move
% the whole of the \strayman\ stuff around as one directory.
%
%    \begin{macrocode}
\input{strayman.\@ptsize}
%</strayman>
%    \end{macrocode}
%
% \section{Package loading}
%
%    \begin{macrocode}
%<*strayman>
\RequirePackage{fancyhdr}
\RequirePackage{multicol}
\@delayed
%</strayman>
%    \end{macrocode}
%
% \section{Page layout}
%
% This is largely the domain of the size option files.
%
%    \begin{macrocode}
%<*8pt|9pt|10pt|11pt|12pt|text>
%<+8pt>\ProvidesFile{strayman.8pt}
%<+9pt>\ProvidesFile{strayman.9pt}
%<+10pt>\ProvidesFile{strayman.10pt}
%<+11pt>\ProvidesFile{strayman.11pt}
%<+12pt>\ProvidesFile{strayman.12pt}
%<+text>\ProvidesFile{strayman.text}
%    \end{macrocode}
%
% \subsection{Font sizes}
%
% These are fairly standard, and mainly copied from the original size
% options.
%
% \begin{macro}{\@setparskip}
%
% Because we separate paragraphs by vertical space, we need to vary this
% gap when we change font size.  This macro does the job.
%
%    \begin{macrocode}
\def\@setparskip{%
  \relax\ifdim\parskip=\z@\else%
    \parskip.67\baselineskip\@plus\p@\relax%
  \fi%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\normalsize}
%
% Defines the standard size of text in the document.
%
%    \begin{macrocode}
\renewcommand\normalsize{%
%<*8pt>
  \@setfontsize\normalsize\@viiipt{9.6\p@}%
  \abovedisplayskip8\p@\@plus2\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6\p@\@plus3\p@\@minus3\p@%
%</8pt>
%<*9pt>
  \@setfontsize\normalsize\@ixpt\@xipt%
  \abovedisplayskip9\p@\@plus2\p@\@minus5\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6\p@\@plus3\p@\@minus3\p@%
%</9pt>
%<*10pt>
  \@setfontsize\normalsize\@xpt\@xiipt%
  \abovedisplayskip10\p@\@plus2\p@\@minus5\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6\p@\@plus3\p@\@minus3\p@%
%</10pt>
%<*11pt>
  \@setfontsize\normalsize\@xipt{13.6}%
  \abovedisplayskip11\p@\@plus3\p@\@minus6\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6.5\p@ \@plus3.5\p@\@minus3\p@%
%</11pt>
%<*12pt>
  \@setfontsize\normalsize\@xiipt{14.5}%
  \abovedisplayskip12\p@\@plus3\p@\@minus7\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6.5\p@ \@plus3.5\p@\@minus3\p@%
%</12pt>
%<*text>
  \@setfontsize\normalsize\@xpt\@xiipt%
  \abovedisplayskip10\p@\@plus2\p@\@minus5\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6\p@\@plus3\p@\@minus3\p@%
%</text>
  \belowdisplayskip\abovedisplayskip%
  \let\@listi\@listI%
  \@setparskip%
}
\normalsize
\parskip2ex\@plus\p@
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\small}
%
% The |\small| size is defined with similar care to |\normalsize|.  The
% list defaults are altered to cope with our different value for |\parskip|.
% We can then separate this out independently from the typesize.
%
%    \begin{macrocode}
%<+text>\let\small\normalsize
%<*8pt|9pt|10pt|11pt|12pt>
\newcommand\small{%
%<*8pt>
  \@setfontsize\small\@viipt{8.4}%
  \abovedisplayskip8\p@\@plus2\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus2\p@%
  \belowdisplayshortskip4\p@\@plus2\p@\@minus2\p@%
%</8pt>
%<*9pt>
  \@setfontsize\small\@viiipt{9.5}%
  \abovedisplayskip8\p@\@plus2\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus2\p@%
  \belowdisplayshortskip4\p@\@plus2\p@\@minus2\p@%
%</9pt>
%<*10pt>
  \@setfontsize\small\@ixpt{11}%
  \abovedisplayskip8.5\p@\@plus3\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus2\p@%
  \belowdisplayshortskip4\p@\@plus2\p@\@minus2\p@%
%</10pt>
%<*11pt>
  \@setfontsize\small\@xpt\@xiipt%
  \abovedisplayskip10\p@\@plus2\p@\@minus5\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6\p@\@plus3\p@\@minus3\p@%
%</11pt>
%<*12pt>
  \@setfontsize\small\@xipt{13.6}%
  \abovedisplayskip11\p@\@plus3\p@\@minus6\p@%
  \abovedisplayshortskip\z@ \@plus3\p@%
  \belowdisplayshortskip6.5\p@ \@plus3.5\p@\@minus3\p@%
%</12pt>
  \def\@listi{%
    \leftmargin\leftmargini%
    \topsep\z@%
    \parsep\parskip%
    \itemsep\z@%
  }%
  \belowdisplayskip\abovedisplayskip%
  \@setparskip%
}
%</8pt|9pt|10pt|11pt|12pt>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\footnotesize}
%
% This is also defined with the meticulous care of |\normalsize|, and
% altered in the same way as for |\small|.
%
%    \begin{macrocode}
%<+text>\let\footnotesize\normalsize
%<*8pt|9pt|10pt|11pt|12pt>
\newcommand\footnotesize{%
%<*8pt>
  \@setfontsize\footnotesize\@vipt\@viipt%
  \abovedisplayskip6\p@\@plus2\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus\p@%
  \belowdisplayshortskip3\p@\@plus\p@\@minus2\p@%
%</8pt>
%<*9pt>
  \@setfontsize\footnotesize\@viipt{8.4}%
  \abovedisplayskip6\p@\@plus2\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus\p@%
  \belowdisplayshortskip3\p@\@plus\p@\@minus2\p@%
%</9pt>
%<*10pt>
  \@setfontsize\footnotesize\@viiipt{9.5}%
  \abovedisplayskip6\p@\@plus2\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus\p@%
  \belowdisplayshortskip3\p@\@plus\p@\@minus2\p@%
%</10pt>
%<*11pt>
  \@setfontsize\footnotesize\@ixpt{11}%
  \abovedisplayskip8\p@\@plus2\p@\@minus4\p@%
  \abovedisplayshortskip\z@\@plus\p@%
  \belowdisplayshortskip4\p@\@plus2\p@\@minus2\p@%
%</11pt>
%<*12pt>
  \@setfontsize\footnotesize\@xpt\@xiipt
  \abovedisplayskip10\p@\@plus2\p@\@minus5\p@%
  \abovedisplayshortskip\z@\@plus3\p@%
  \belowdisplayshortskip6\p@\@plus3\p@\@minus3\p@%
%</12pt>
  \def\@listi{%
    \leftmargin\leftmargini%
    \topsep\z@%
    \parsep\parskip%
    \itemsep\z@%
  }%
  \belowdisplayskip\abovedisplayskip%
  \@setparskip%
}
%</8pt|9pt|10pt|11pt|12pt>
%    \end{macrocode}
% \end{macro}
%
% The other sizes are all much simpler.  We introduce a new size,
% |\listingsize|, which is used for the \env{listing} environment, to ensure
% that 77 columns of text fit across an A5 sheet.
%
%    \begin{macrocode}
%<*8pt>
\newcommand\scriptsize{\@setfontsize\scriptsize\@vpt\@vipt\@setparskip}
\newcommand\tiny{\@setfontsize\tiny{4}\@vpt\@setparskip}
\newcommand\large{\@setfontsize\large\@xpt\@xiipt\@setparskip}
\newcommand\Large{\@setfontsize\Large\@xipt{13}\@setparskip}
\newcommand\LARGE{\@setfontsize\LARGE\@xiipt\@xivpt\@setparskip}
\newcommand\huge{\@setfontsize\huge\@xviipt{20}\@setparskip}
\newcommand\Huge{\@setfontsize\Huge\@xxpt{26}\@setparskip}
%</8pt>
%<*9pt>
\newcommand\scriptsize{\@setfontsize\scriptsize\@vipt\@viipt\@setparskip}
\newcommand\tiny{\@setfontsize\tiny\@vpt\@vipt\@setparskip}
\newcommand\large{\@setfontsize\large\@xipt{13}\@setparskip}
\newcommand\Large{\@setfontsize\Large\@xiipt{14.4}\@setparskip}
\newcommand\LARGE{\@setfontsize\LARGE\@xivpt{17}\@setparskip}
\newcommand\huge{\@setfontsize\huge\@xviipt{20}\@setparskip}
\newcommand\Huge{\@setfontsize\Huge\@xxpt{26}\@setparskip}
%</9pt>
%<*10pt>
\newcommand\scriptsize{\@setfontsize\scriptsize\@viipt\@viiipt\@setparskip}
\newcommand\tiny{\@setfontsize\tiny\@vpt\@vipt\@setparskip}
\newcommand\large{\@setfontsize\large\@xiipt{14}\@setparskip}
\newcommand\Large{\@setfontsize\Large\@xivpt{18}\@setparskip}
\newcommand\LARGE{\@setfontsize\LARGE\@xviipt{22}\@setparskip}
\newcommand\huge{\@setfontsize\huge\@xxpt{25}\@setparskip}
\newcommand\Huge{\@setfontsize\Huge\@xxvpt{30}\@setparskip}
%</10pt>
%<*11pt>
\newcommand\scriptsize{\@setfontsize\scriptsize\@viiipt{9.5}\@setparskip}
\newcommand\tiny{\@setfontsize\tiny\@vipt\@viipt\@setparskip}
\newcommand\large{\@setfontsize\large\@xiipt{14}\@setparskip}
\newcommand\Large{\@setfontsize\Large\@xivpt{18}\@setparskip}
\newcommand\LARGE{\@setfontsize\LARGE\@xviipt{22}\@setparskip}
\newcommand\huge{\@setfontsize\huge\@xxpt{25}\@setparskip}
\newcommand\Huge{\@setfontsize\Huge\@xxvpt{30}\@setparskip}
%</11pt>
%<*12pt>
\newcommand\scriptsize{\@setfontsize\scriptsize\@viiipt{9.5}\@setparskip}
\newcommand\tiny{\@setfontsize\tiny\@vipt\@viipt\@setparskip}
\newcommand\large{\@setfontsize\large\@xivpt{18}\@setparskip}
\newcommand\Large{\@setfontsize\Large\@xviipt{22}\@setparskip}
\newcommand\LARGE{\@setfontsize\LARGE\@xxpt{25}\@setparskip}
\newcommand\huge{\@setfontsize\huge\@xxvpt{30}\@setparskip}
\let\Huge\huge
%</12pt>
%<+8pt|9pt|10pt|11pt|12pt>\let\listingsize\footnotesize
%<*text>
\def\scriptsize{\@setfontsize\scriptsize\@xpt\@xiipt\@setparskip}
\let\tiny\scriptsize
\let\large\scriptsize
\let\Large\scriptsize
\let\LARGE\scriptsize
\let\huge\scriptsize
\let\Huge\scriptsize
\let\listingsize\scriptsize
%
\let\txt@selectfont\selectfont
\def\selectfont{%
  \fontfamily\ttdefault%
  \fontseries{m}%
  \fontshape{n}%
  \txt@selectfont%
}
%</text>
%</8pt|9pt|10pt|11pt|12pt|text>
%    \end{macrocode}
%
% \subsection{Paragraph layout}
%
% Here we define various paragraph layout parameters.
%
% First, set up the line separation parameters.  |\baselineskip| is set
% up by the individual size commands.
%
%    \begin{macrocode}
%<*strayman>
\lineskip\p@
\normallineskip\p@
%    \end{macrocode}
%
% We don't try to stretch the baselines apart:
%
%    \begin{macrocode}
\renewcommand\baselinestretch{}
%    \end{macrocode}
%
% We don't indent paragraphs at all; instead, we separate them with blank
% lines.  The vertical gap is worked out in the size command; we just clear
% |\parindent|.
%
%    \begin{macrocode}
\parindent\z@
%    \end{macrocode}
%
% Set up some standard penalty values.
%
%    \begin{macrocode}
\@lowpenalty   51
\@medpenalty  151
\@highpenalty 301
%</strayman>
%    \end{macrocode}
%
% \subsection{Page layout}
%
% Our layout is a bit different to the standard \LaTeX\ ones: we leave a lot
% of space down the left hand side: this is reserved for headings and
% marginal notes.
%
% Calculating the size of the space on the left, which we call |\leftindent|,
% is complicated.  We want to use as much of the width of the page as
% possible, unlike the \LaTeX\ defaults, making sure that we can fit on
% 77 columns of |\listingsize\tt| text.  We also try to make space for a
% reasonable amount of marginal text, although we don't worry too much if
% that suffers.
%
% The calculation is done as follows.  More than about 40\,mm of margin will
% look very strange.  We must have at least 104\,mm of main text, which
% leaves 20\,mm for the notes on A5 paper (actually, 17\,mm, since we leave
% 3\,mm gap between the notes and the main text).  We divide the page
% horizontally into $s$\,mm of left border, $m$\,mm of marginal notes,
% $t$\,mm of body text, and another $s$\,mm of right border, giving
% a total of $w$\,mm.  The value $s$ is given to us by the parameter
% |\pagesurround|.
%
% Articles look odd with a big gap down the side, so this is reduced when
% necessary.
%
% We calculate the quantity~$m$ as $\min\bigl(40,17(w-2s-3)/121+3\bigr)$\@.
% Then we calculate $t=w-m-24-3$.
%
%    \begin{macrocode}
%<*8pt|9pt|10pt|11pt|12pt|text>
\newdimen\leftindent
%<*8pt|9pt|10pt|11pt|12pt>
\leftindent\paperwidth
\if@offsetpages
  \advance\leftindent-2\pagesurround
  \advance\leftindent-3mm
  \leftindent0.1405\leftindent
  \advance\leftindent3mm
  \ifdim\leftindent>40mm\relax
    \leftindent40mm
  \fi
  \if@article\divide\leftindent\tw@\fi
  \ifdim\leftindent<15mm\leftindent15mm\fi
\else
  \leftindent\z@
\fi
%</8pt|9pt|10pt|11pt|12pt>
%<+text>\leftindent8\tt@chw
%    \end{macrocode}
%
% In two-column layouts, we prevent headings from being outdented, by
% zeroing |\sectindent|.  Chapter headings and suchlike are still outdented
% as before.  We do not support margin paragraphs in two-column layouts.
%
%    \begin{macrocode}
\newdimen\sectindent
\if@twocolumn
  \sectindent\z@
\else
  \sectindent\if@numbering\z@\else\if@article\else\tw@\fi\leftindent\fi
\fi
%    \end{macrocode}
%
% Having set up the size of the margin, we can get on with the rest of the
% setting up.
%
% First, we fix |\hoffset| and |\voffset| so we can work on the whole size
% of the paper.
%
%    \begin{macrocode}
\advance\hoffset-1in
\advance\voffset-1in
%    \end{macrocode}
%
% Now we can design the page layout in earnest.  We begin with the vertical
% layout.
%
%    \begin{macrocode}
%<+8pt>\topskip8\p@
%<+9pt>\topskip9\p@
%<+10pt>\topskip10\p@
%<+11pt>\topskip11\p@
%<+12pt>\topskip12\p@
%<+text>\topskip\tt@chh
%<-text>\topmargin\pagesurround
%<+text>\topmargin\z@
%<-text>\headheight12\p@
%<+text>\headheight12\p@
%<-text>\headsep.5\pagesurround
%<+text>\headsep2\tt@chh
%<+text>\advance\headsep-12\p@
%<-text>\footskip12\p@
%<-text>\advance\footskip.5\pagesurround
%<+text>\footskip2\tt@chh
\textheight\paperheight
%<-text>\advance\textheight-24\p@
%<-text>\advance\textheight-3\pagesurround
%<+text>\advance\textheight-4\tt@chh
%    \end{macrocode}
%
% Now we define the horizontal layout.
%
%    \begin{macrocode}
\oddsidemargin\leftindent
%<-text>\advance\oddsidemargin\pagesurround
\evensidemargin\oddsidemargin
\textwidth\paperwidth
  \advance\textwidth-\oddsidemargin
%<-text>  \advance\textwidth-\pagesurround
%<-text>\marginparsep3mm
%<+text>\marginparsep\tt@chw
\marginparwidth\leftindent
  \advance\marginparwidth-\marginparsep
%    \end{macrocode}
%
% Setting |\maxdepth| is fairly simple.  This looks odd, because normally
% there's some messing for compatibility with \LaTeX~2.09.
%
%    \begin{macrocode}
\maxdepth.5\topskip
\@maxdepth\maxdepth
%    \end{macrocode}
%
% Marginal notes need some setting up.
%
%    \begin{macrocode}
\marginparpush5\p@
%    \end{macrocode}
% 
% Footnotes need some setting up now.
%
%    \begin{macrocode}
%<+8pt>\footnotesep5.8\p@
%<+9pt>\footnotesep6.2\p@
%<+10pt>\footnotesep6.65\p@
%<+11pt>\footnotesep7.7\p@
%<+12pt>\footnotesep8.4\p@
%<+8pt>\setlength{\skip\footins}{7\p@\@plus4\p@\@minus2\p@}
%<+9pt>\setlength{\skip\footins}{8\p@\@plus4\p@\@minus2\p@}
%<+10pt>\setlength{\skip\footins}{9\p@\@plus4\p@\@minus2\p@}
%<+11pt>\setlength{\skip\footins}{10\p@\@plus4\p@\@minus2\p@}
%<+12pt>\setlength{\skip\footins}{10.8\p@\@plus4\p@\@minus2\p@}
%</8pt|9pt|10pt|11pt|12pt|text>
%    \end{macrocode}
%
% \subsection{Float placement}
%
% First, we determine how we position the floats on the page.
%
%    \begin{macrocode}
%<*strayman>
\setcounter{topnumber}{2}
\renewcommand\topfraction{.7}
\setcounter{bottomnumber}{1}
\renewcommand\bottomfraction{.3}
\setcounter{totalnumber}{3}
\renewcommand\textfraction{.1}
\renewcommand\floatpagefraction{.8}
\setcounter{dbltopnumber}{2}
\renewcommand\dbltopfraction{.7}
\renewcommand\dblfloatpagefraction{.5}
%</strayman>
%    \end{macrocode}
%
% Now we define the glue which surrounds floats.
%
%    \begin{macrocode}
%<*8pt|9pt|10pt|11pt|12pt>
\floatsep12\p@\@plus2\p@\@minus2\p@
\textfloatsep20\p@\@plus2\p@\@minus4\p@
\dbltextfloatsep20\p@\@plus2\p@\@minus4\p@
%<+8pt|9pt|10pt|11pt>\intextsep12\p@\@plus2\p@\@minus 2\p@
%<+8pt|9pt|10pt|11pt>\dblfloatsep12\p@\@plus2\p@\@minus 2\p@
%<+12pt>\intextsep14\p@\@plus4\p@\@minus 4\p@
%<+12pt>\dblfloatsep14\p@\@plus2\p@\@minus 4\p@
%    \end{macrocode}
%
% We must now define the parameters for float pages and columns.
%
%    \begin{macrocode}
\@fptop0\p@\@plus 1fil
%<+8pt|9pt|10pt|11pt>\@fpsep8\p@\@plus2fil
%<+12pt>\@fpsep10\p@\@plus2fil
\@fpbot0\p@\@plus 1fil
%
\@dblfptop0\p@\@plus 1fil
%<+8pt|9pt|10pt|11pt>\@dblfpsep8\p@\@plus 2fil
%<+12pt>\@dblfpsep10\p@\@plus2fil
\@dblfpbot0\p@\@plus 1fil
%</8pt|9pt|10pt|11pt|12pt>
%    \end{macrocode}
%
% \section{Headers and footers}
%
% This part defines the standard page styles.  By default, \strayman\
% imports \package{fancyheadings} and uses them, although this section is
% retained in case anything actually needs the original \LaTeX-style
% headings.
%
%    \begin{macrocode}
%<*strayman>
\def\ps@headings{%
\let\@oddfoot\@empty\let\@evenfoot\@empty
\def\@evenhead{\thepage\hfil\slshape\leftmark}%
\def\@oddhead{{\slshape\rightmark}\hfil\thepage}%
\let\@mkboth\markboth
\def\chaptermark##1{\markboth {\thechapter. ##1}{}}%
\def\sectionmark##1{\markright {\thesection. ##1}}%
}
%
\def\ps@myheadings{%
  \let\@oddfoot\@empty\let\@evenfoot\@empty
  \def\@evenhead{\thepage\hfil\slshape\leftmark}%
  \def\@oddhead{{\slshape\rightmark}\hfil\thepage}%
  \let\@mkboth\@gobbletwo
  \let\chaptermark\@gobble
  \let\sectionmark\@gobble
}
%    \end{macrocode}
%
% \section{Titles}
%
% \begin{macro}{\maketitle}
% This is a bit of a thorny issue at the moment.  Really, these titles need
% a complete rewrite.  The |\maketitle| command will only be used for inside
% front covers anyway.  I'm wondering if it wouldn't be better just to use
% special case code for each individual manual.  Until a decision is made,
% I'll leave this as it was in \package{book}.
%
% \begin{note}
% This code is largely uncommented.  It seems to be fairly straightforward,
% and if I do need to change it, I'll probably start again from scratch
% anyway.
% \end{note}
%
%    \begin{macrocode}
\if@titlepage
%
  \newcommand\maketitle{%
    \begin{titlepage}%
      \let\footnotesize\small%
      \let\footnoterule\relax%
      \null\vfil%
      \vskip 60\p@%
      \begin{center}%
        {\LARGE\@title\par}%
        \vskip3em%
        {%
          \large%
          \lineskip.75em%
          \begin{tabular}[t]{c}%
            \@author%
          \end{tabular}%
          \par%
        }%
        \vskip1.5em%
        {\large \@date \par}%       % Set date in \large size.
      \end{center}%
      \par%
      \@thanks%
      \vfil\null%
    \end{titlepage}%
    \setcounter{footnote}{0}%
    \let\thanks\relax%
    \let\maketitle\relax%
    \gdef\@thanks{}%
    \gdef\@author{}%
    \gdef\@title{}%
  }
%
\else
%
  \newcommand\maketitle{%
    \par%
    \begingroup%
      \renewcommand\thefootnote{\fnsymbol{footnote}}%
      \def\@makefnmark{\hb@xt@\z@{$\m@th^{\@thefnmark}$\hss}}%
      \long\def\@makefntext##1{%
        \parindent1em\noindent%
        \hb@xt@1.8em{\hss$\m@th^{\@thefnmark}$}##1%
      }%
      \if@twocolumn%
        \ifnum\col@number=\@ne%
          \@maketitle%
        \else%
          \twocolumn[\@maketitle]%
        \fi%
      \else%
        \newpage%
        \global\@topnum\z@%   % Prevents figures from going at top of page.
        \@maketitle%
      \fi%
      \thispagestyle{plain}%
      \@thanks%
    \endgroup%
    \setcounter{footnote}{0}%
    \let\thanks\relax%
    \let\maketitle\relax%
    \let\@maketitle\relax%
    \gdef\@thanks{}%
    \gdef\@author{}%
    \gdef\@title{}%
  }
%
\fi
%
\def\@maketitle{%
  \newpage%
  \null%
  \vskip2em%
  \begin{center}%
    {\LARGE\@title\par}%
    \vskip1.5em%
    {%
      \large%
      \lineskip.5em%
      \begin{tabular}[t]{c}%
        \@author%
      \end{tabular}%
      \par%
    }%
    \vskip 1em%
    {\large\@date}%
  \end{center}%
  \par%
  \vskip1.5em%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{environment}{titlepage}
%
% The \env{titlepage} environment typesets its contents on a title page. 
% The implementation is fairly straightforward: we just need to do some
% fiddling with two-column layouts.  We also add in some hacking to make
% title pages centred properly, a bit like the \env{central} environment.
%
%    \begin{macrocode}
\newenvironment{titlepage}{%
  \cleardoublepage%
  \if@twocolumn%
    \@restonecoltrue\onecolumn%
  \else%
    \@restonecolfalse\newpage%
  \fi%
  \centrepage%
  \if@compatibility%
    \setcounter{page}{0}%
  \fi%
}{%
  \thispagestyle{empty}%
  \if@restonecol%
    \twocolumn%
  \else%
    \newpage%
  \fi%
}
%    \end{macrocode}
% \end{environment}
%
% \begin{macro}{\centrepage}
%
% Change the page layout to centre everything properly.  We guard against
% this sort of thing happening again by clearing |\leftindent| and
% |\sectindent|.  This should only be cleared after the page has been
% finished, for obvious reasons.
%
%    \begin{macrocode}
\def\centrepage{%
  \advance\oddsidemargin-\leftindent%
  \advance\evensidemargin-\leftindent%
  \advance\textwidth\leftindent%
  \advance\linewidth\leftindent%
  \advance\leftmargini0.5\leftindent%
  \leftindent\z@%
  \sectindent\z@%
  \hsize\textwidth%
}
%    \end{macrocode}
% \end{macro}
%
% \section{Sectioning commands}
%
% In \strayman, quite a lot of the sectioning is different.  We
% don't tend to number sections much.  Also, the chapter heading style has
% been completely rewritten (several times).
%
% \subsection{Setting up the counters}
%
% This is pretty simple stuff.
%
%    \begin{macrocode}
\newcommand\chaptermark[1]{}
\setcounter{secnumdepth}{\if@numbering\if@runinsubsubsec2\else3\fi\else0\fi}
\newcounter {part}
\newcounter {chapter}
\newcounter {section}[chapter]
\newcounter {subsection}[section]
\newcounter {subsubsection}[subsection]
\newcounter {paragraph}[subsubsection]
\newcounter {subparagraph}[paragraph]
\renewcommand\thepart          {\Roman{part}}
\renewcommand\thechapter       {\arabic{chapter}}
\if@article
  \renewcommand\thesection     {\arabic{section}}
\else
  \renewcommand\thesection     {\thechapter.\arabic{section}}
\fi
\renewcommand\thesubsection    {\thesection.\arabic{subsection}}
\renewcommand\thesubsubsection {\thesubsection .\arabic{subsubsection}}
\renewcommand\theparagraph     {\thesubsubsection.\arabic{paragraph}}
\renewcommand\thesubparagraph  {\theparagraph.\arabic{subparagraph}}
%    \end{macrocode}
%
% \subsection{Frontmatter, mainmatter and backmatter}
%
% We start off thinking we're in the main matter.  The user ought to put a
% |\frontmatter| command at the beginning of the document if this is not
% correct, as it usually won't be.
%
%    \begin{macrocode}
\newif\if@mainmatter
\@mainmattertrue
\newcommand\frontmatter{%
  \cleardoublepage%
  \@mainmatterfalse%
  \pagenumbering{roman}%
}
\newcommand\mainmatter{%
  \cleardoublepage%
  \@mainmattertrue%
  \pagenumbering{arabic}%
}
\newcommand\backmatter{%
  \if@openright%
    \cleardoublepage%
  \else%
    \clearpage%
  \fi%
  \@mainmatterfalse%
}
%    \end{macrocode}
%
% \subsection{Abstracts}
%
% \begin{environment}{abstract}
%
% The \env{abstract} environment reduces the type size and margins slightly.
% Abstracts are placed on their own pages when the |titlepage| option is
% enabled.  The code is filched from the LaTeX article class.
%
%    \begin{macrocode}
\if@titlepage
  \newenvironment{abstract}{%
      \titlepage
      \null\vfil
      \@beginparpenalty\@lowpenalty
      \begin{center}%
        \bfseries \abstractname
        \@endparpenalty\@M
      \end{center}}%
     {\par\vfil\null\endtitlepage}
\else
  \newenvironment{abstract}{%
      \if@twocolumn
        \section*{\abstractname}%
      \else
        \small
        \list{}{%
          \def\makelabel##1{%
            \normalfont%
            \fontseries{b}\fontfamily\headdefault\selectfont%
            ##1%
          }%
          \labelsep1em\labelwidth\z@\itemindent\labelsep%
          \rightmargin\leftmargin%
        }
        \item[\abstractname]%
      \fi}
      {\if@twocolumn\else\endlist\fi}
\fi
%    \end{macrocode}
% \end{environment}
%
% \subsection{Appendices}
%
% \begin{macro}{\appendix}
%
% This command sets everything up to typeset the appendix.
%
%    \begin{macrocode}
\newcommand\appendix{%
  \par%
  \setcounter{chapter}{0}%
  \setcounter{section}{0}%
  \renewcommand\@chapapp{\appendixname}%
  \if@article%
    \renewcommand\thesection{\Alph{section}}%
  \else%
    \renewcommand\thechapter{\Alph{chapter}}%
  \fi%
  \@appendixtrue%
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Parts}
%
% Part headings are typeset on completely unadorned sheets, devoid of page
% numbers and suchlike.  Because of the strange page layout, we have to
% put the part heading into a |central| environment. to stop the page looking
% horribly lopsided.
%
% \begin{macro}{\part}
%
% The |\part| macro moves to an appropriate page, changes the pagestyle to
% empty to switch off page numbering, and then calls |\@part| or |\@spart|
% as appropriate, according to whether a \lit* was supplied.  We put some
% |\vfil| glue in, to vertically centre anything that these commands typeset,
% and ensure printing in a single column.
%
%    \begin{macrocode}
\newcommand\part{%
  \cleardoublepage%
  \thispagestyle{empty}%
  \if@twocolumn%
    \onecolumn%
    \@tempswatrue%
  \else%
    \@tempswafalse%
  \fi%
  \hbox{}\vfil%
  \begin{centrepage}%
  \secdef\@part\@spart%
}
%    \end{macrocode}
%
% \begin{macro}{\@part}
%
% This is where most of the part heading typesetting is done.  We stick a
% line in the contents file, clear the heading markers, and typeset the
% heading in the biggest letters we can find.  When we're done, we call
% |\@endpart| to do some common cleaning up.
%
%    \begin{macrocode}
\def\@part[#1]#2{%
  \ifnum\c@secnumdepth>-2\relax%
    \refstepcounter{part}%
    \addcontentsline{toc}{part}{\thepart\hspace{1em}#1}%
  \else%
    \addcontentsline{toc}{part}{#1}%
  \fi%
  \markboth{}{}%
  \centering%
  \interlinepenalty\@M%
  \reset@font%
  \ifnum\c@secnumdepth>-2\relax%
    \huge\bfseries\headfam\partname~\thepart%
    \par%
    \vskip20\p@
  \fi%
  \normalfont\Huge\bfseries\headfam#2\par%
  \@endpart%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@spart}
%
% Here we typeset just the part heading: numbers have been suppressed.  Also
% we don't put things into the contents file.  Otherwise, this is similar to
% |\@part|.
%
%    \begin{macrocode}
\def\@spart#1{%
  \centering%
  \interlinepenalty\@M%
  \reset@font%
  \normalfont\Huge\bfseries\headfam#1\par%
  \@endpart%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@endpart}
%
% This does the clearing up operation after a part has been typeset.  We
% insert the other |\vfil| glue to centre the heading, clear the other
% side of the page, if printing two-sided, and return if necessary to
% two-column printing.
%
%    \begin{macrocode}
\def\@endpart{%
  \vfil\newpage%
  \end{centrepage}%
  \if@twoside%
    \hbox{}%
    \thispagestyle{empty}%
    \newpage%
  \fi%
  \if@tempswa%
    \twocolumn%
  \fi%
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Chapters}
%
% The chapter typesetting has been more-or-less rewritten.  We'll follow this
% in a reasonable amount of detail.
%
% \begin{macro}{\@chapapp}
%
% Because |\appendix| needs to change what chapters are called, we add a
% level of indirection through |\@chapapp|:
%
%    \begin{macrocode}
\newcommand\@chapapp{\chaptername}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\chapter}
%
% The |\chapter| command is the main dispatcher for chapters.  We move to
% an appropriate page, depending on the |openright| setting, suppress
% headers, and then call |\@chapter| or |\@schapter| as appropriate.
%
%    \begin{macrocode}
\newcommand\chapter{%
  \if@openright%
    \cleardoublepage%
  \else%
    \clearpage%
  \fi%
  \thispagestyle{plain}%
  \global\@topnum\z@%
  \@afterindentfalse%
  \secdef\@chapter\@schapter%
}
%    \end{macrocode}
%
% \begin{macro}{\@chapter}
%
% There's a lot of messing about to do, depending on whether we're in the
% main matter and so on.  We'll take this carefully.
%
%    \begin{macrocode}
\def\@chapter[#1]#2{%
%    \end{macrocode}
%
% The first thing to do is put a line in the contents table.  We need to
% check |secnumdepth| and the |mainmatter| flag for this: we should only
% include a number if both these tests pass.  In this case, we also type a
% message on the terminal.
%
%    \begin{macrocode}
  \ifnum\c@secnumdepth>\m@ne%
    \if@mainmatter%
      \refstepcounter{chapter}%
      \typeout{\@chapapp\space\thechapter.}%
      \addcontentsline{toc}{chapter}{\protect\numberline{\thechapter}#1}%
    \else
      \addcontentsline{toc}{chapter}{#1}%
    \fi
  \else
    \addcontentsline{toc}{chapter}{#1}
  \fi
%    \end{macrocode}
%
% Now we put a bit of space in the lists of figures and tables, and set up
% the mark to put the chapter heading in the running header.
%    \begin{macrocode}
  \chaptermark{#1}%
  \addtocontents{lof}{\protect\addvspace{10\p@}}%
  \addtocontents{lot}{\protect\addvspace{10\p@}}%
%    \end{macrocode}
%
% Finally, we need to decide how to typeset the chapter heading.  On
% single-column chapters, this is easy.  On double-column formats, we need
% to do horrid things with |\@topnewpage|.
%
%    \begin{macrocode}
  \if@twocolumn%
    \@topnewpage[\@makechapterhead{%
      \hb@xt@.5\leftindent{\thechapter\hfil}%
    }{#2}]%
  \else%
    \@makechapterhead{%
      \hb@xt@.5\leftindent{\thechapter\hfil}%
    }{#2}%
    \@afterheading%
  \fi%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@makechapterhead}
%
% This macro actually does the job of typesetting a chapter heading.  Call
% this routine as |\@makechapterhead{|\synt{number}|}{|\synt{title}|}|.
% Here, \synt{number} is how to typeset the chapter number, and \synt{title}
% is the rest of the title.  To suppress the number, just leave \synt{number}
% empty.  The number is only typeset when it is correct to do so anyway.
%
% The spacing is rather awkward.  We have to cope with two-column layouts,
% which seem to require different spacing.  In a double-column layout,
% the title is normally one |\baselineskip| too high.  Also, the space I
% add at the bottom of the heading gets eaten in double-column chapters,
% because I'm actually typesetting into a vbox which is floated to the top
% by \LaTeX\ in a fairly horrid way.  This can't really be worked around,
% so we just make the space beneath the heading equal to |\dbltextfloatsep|,
% which is what gets added anyway.
%
% The other snags are to do with the rule after the chapter heading.
% Firstly, this is meant to be typeset into the left margin, like the
% heading itself, which is a bit messy.  More awkwardly, we have to be
% careful not to let the depth of the line vary when the chapter heading has
% descenders, although obviously we must lower the rule if the heading really
% is very deep indeed.
%
% 
% We'll approach this a bit at a time.
%
%    \begin{macrocode}
\def\@makechapterhead#1#2{%
  \begingroup%                          % Stop my hacking messing things up
%    \end{macrocode}
%
% First, the top spacing.  This is divided into two parts, by an invisible
% rule: the |\vskip| above the rule is eaten by \TeX\ if this is a genuine
% new page, but put into the floating vbox if this is a two-column affair.
% The second bit is added in both cases.
%
%    \begin{macrocode}
    \vskip\baselineskip%                % This is gobbled in single column
    \hrule\@height\z@%                  % Stops TeX from binning my vskips
    \vskip32\p@%                        % Start chapters in a funny place
%    \end{macrocode}
%
% Now we actually typeset the heading.  This is fairly simple: we must just
% check that we need to typeset the number.
%
%    \begin{macrocode}
    \normalfont\Huge\bfseries\headfam%  % Choose a nice font for it
    \raggedright                        % Don't justify -- it looks nasty
    \@hangfrom{\hskip-\leftindent}%     % Start text at `real left margin'
    \ifnum\c@secnumdepth>\m@ne%         % Do we typeset chapter numbers?
      \if@mainmatter%                   % Are we past the front matter?
        #1%                             % Yes -- then typeset the number
    \fi\fi%                             % Now back to normality
    {#2}%                               % Typeset the actual chapter head
    \par\nobreak%                       % Back to vmode again, please
%    \end{macrocode}
%
% The next tricky bit is the space before the ruleoff.  We must be careful
% here:
%
% \begin{itemize}
%
% \item We want the rule to be the right depth below the heading baseline,
% regardless of whether the heading contains descenders: helpfully, \TeX\
% omits |\baselineskip| glue before and after rules.
%
% \item We want the rule to always be below any oddly deep descenders that
% a strange user might throw at us (e.g., horrid fractions or weird
% |\vrule|s).
%
% \end{itemize}
%
% We accomplish this by scrutinising |\prevdepth| carefully.
%
%    \begin{macrocode}
    \@tempdima14\p@%                    % Be this low below the baseline
    \advance\@tempdima-\prevdepth%      % This is the actual skip then
    \ifdim\@tempdima<8\p@%              % Is this not enough skippage?
      \@tempdima8\p@%                   % No: then skip some more
    \fi%
    \vskip\@tempdima%                   % Skip a bit below the title
%    \end{macrocode}
%
% Now we can set the rule.  This needs a little care.
%
%    \begin{macrocode}
    \@tempskipa\textwidth%              % Find the width of the column
    \advance\@tempskipa\leftindent%     % Add on the big lefthand gap
    \nointerlineskip%                   % Don't add any more space please
    \moveleft\leftindent\vbox{%         % Shift something left by an amount
      \hrule\@width\@tempskipa%         % Typeset the rule nicely
    }%
    \nointerlineskip%                   % Don't leave a gap beneath it
%    \end{macrocode}
%
% Finally, we leave a gap.  In two-column layouts this is done for us, and
% \LaTeX\ gobbles this glue and replaces it with |\dbltextfloatsep|.  To make
% things consistent, this is the glue we use anyway.
%
%    \begin{macrocode}
    \nobreak%                           % This would be a bad place to break
    \vspace{\dbltextfloatsep}%          % Add in some extra glue beneath
  \endgroup%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@makeschapterhead}
%
% This is now just a veneer onto |\@makechapterhead|.  It's needed, because
% other bits of \LaTeX\ call it.
%
%    \begin{macrocode}
\def\@makeschapterhead{%
  \@makechapterhead{}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@schapter}
%
% This macro typesets a starred chapter heading.  This is terribly simple,
% compared to the sort of things we've been doing so far.
%
%    \begin{macrocode}
\def\@schapter#1{%
  \if@twocolumn%
    \@topnewpage[\@makeschapterhead{#1}]%
  \else%
    \@makeschapterhead{#1}%
    \@afterheading%
  \fi%
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{The other sectioning commands}
%
% These are all defined through |\@startsection|.  They've been modified
% to typeset sections and subsections hanging into the left margin, and to
% moderate the amount of following space, due to the extra |\parskip| already
% introduced.
%
%    \begin{macrocode}
\newcommand\section{%
  \@startsection%
    {section}%                          % Section name (for contents)
    {1}%                                % Level number (for numbering)
    {-.5\sectindent}%                   % Indentation of title
    {-1.5ex\@plus-1ex\@minus-.2ex}%     % Space after title (vert/horiz)
    {.3ex\@plus.2ex}%                   % Space before title
    {\reset@font\Large\bfseries\headfam}% How to typeset the title
}
\newcommand\subsection{%
  \@startsection%
    {subsection}%
    {2}%
    {-.25\sectindent}%
    {-1.25ex\@plus-1ex\@minus-.2ex}%
    {\p@\@plus.2ex}%
    {\reset@font\large\bfseries\headfam}%
}
\if@runinsubsubsec
\newcommand\subsubsection{%
  \@startsection%
    {subsubsection}%
    {3}%
    {\z@}%
    {0pt\@plus1ex\@minus.2ex}%
    {-1em}%
    {\reset@font\normalsize\bfseries\headfam}%
}
\newcommand\paragraph{%
  \@startsection%
    {paragraph}%
    {4}%
    {\z@}%
    {0pt\@plus.5ex\@minus.1ex}%
    {-1em}%
    {\reset@font\normalsize\bfseries\headfam}%
}
\newcommand\subparagraph{%
  \@startsection%
    {subparagraph}%
    {5}%
    {\parindent}%
    {0pt\@plus.5ex\@minus.1ex}%
    {-1em}%
    {\reset@font\normalsize\bfseries\headfam}%
}
\else
\newcommand\subsubsection{%
  \@startsection%
    {subsubsection}%
    {3}%
    {\z@}%
    {-1.25ex\@plus-1ex\@minus-.2ex}%
    {\p@\@plus.2ex}%
    {\reset@font\normalsize\bfseries\headfam}%
}
\newcommand\paragraph{%
  \@startsection%
    {paragraph}%
    {4}%
    {\z@}%
    {0pt\@plus1ex\@minus.2ex}%
    {-1em}%
    {\reset@font\normalsize\bfseries\headfam}%
}
\newcommand\subparagraph{%
  \@startsection%
    {subparagraph}%
    {5}%
    {\parindent}%
    {0pt\@plus.5ex\@minus.1ex}%
    {-1em}%
    {\reset@font\normalsize\bfseries\headfam}%
}
\fi
%    \end{macrocode}
%
% \subsection{Section number formatting}
%
% \begin{macro}{\@seccntformat}
%
% The macro is given a section counter and must format it in some nice way.
%
%    \begin{macrocode}
\def\@seccntformat#1{%
  \llap{\csname the#1\endcsname{\normalsize\quad}\hfil}%
}
%
% \subsection{Top level sectioning}
%
% \begin{macro}{\@topsect}
%
% Articles are divided into sections; other documents are divided into
% chapters.  Things like the table of contents need to know which.
%
%    \begin{macrocode}
\if@article
  \def\@topsect@star{\section*}
  \let\@topsect\section
\else
  \let\@topsect@star\chapter
  \let\@topsect\chapter
\fi
%    \end{macrocode}
%
% \end{macro}
%
%
% \section{List handling}
%
% A surprising number of \LaTeX's environments are defined in terms of
% lists, many of which hide the fact by putting the entire text in one big
% item.
%
% This part of the document class has to set up lots of list parameters.
% This is largely the same as the standard classes, altered slightly to cope
% with the different paragraph spacing.
%
% \subsection{General list parameters}
%
% Default left margins for lists:
%
%    \begin{macrocode}
\if@twocolumn
  \leftmargini2em
\else
  \leftmargini2.2em
\fi
\leftmarginii2em
\leftmarginiii1.87em
\leftmarginiv1.7em
\if@twocolumn
  \leftmarginv.5em
  \leftmarginvi.5em
\else
  \leftmarginv1em
  \leftmarginvi1em
\fi
%    \end{macrocode}
%
% Other spacing defaults:
%
%    \begin{macrocode}
\leftmargin\leftmargini
\labelsep.5em
\labelwidth\leftmargini
\advance\labelwidth-\labelsep
\partopsep\z@\@plus1\p@\@minus1\p@
%    \end{macrocode}
%
% Interline penalties:
%
%    \begin{macrocode}
\@beginparpenalty -\@lowpenalty
\@endparpenalty   -\@lowpenalty
\@itempenalty     -\@lowpenalty
%    \end{macrocode}
%
% Now we define the defaults for the list environments.  These have managed
% to migrate from the size options into the main document class.
%
%    \begin{macrocode}
\def\@listI{%
  \leftmargin\leftmargini%
  \parsep\parskip%
  \topsep\z@%
  \itemsep\z@%
}
\let\@listi\@listI
\@listi\topsep\parskip%
\def\@listii{%
  \leftmargin\leftmarginii%
  \labelwidth\leftmarginii%
    \advance\labelwidth-\labelsep%
}
\def\@listiii{%
  \leftmargin\leftmarginiii%
  \labelwidth\leftmarginiii%
    \advance\labelwidth-\labelsep%
%  \partopsep\p@\@plus\z@\@minus\p@%
}
\def\@listiv{%
  \leftmargin\leftmarginiv%
  \labelwidth\leftmarginiv%
    \advance\labelwidth-\labelsep%
}
\def\@listv{%
  \leftmargin\leftmarginv%
  \labelwidth\leftmarginv%
    \advance\labelwidth-\labelsep%
}
\def\@listvi{%
  \leftmargin\leftmarginvi%
  \labelwidth\leftmarginvi%
    \advance\labelwidth-\labelsep%
}
%    \end{macrocode}
%
% \subsection{Numbering things}
%
% \begin{macro}{\numberwithin}
%
% Does the obvious thing.  Optional argument gives numbering style.
%
%    \begin{macrocode}
\def\numberwithin{\@testopt\nw@i\arabic}
\def\nw@i[#1]#2#3{%
  \@addtoreset{#2}{#3}%
  \expandafter\xdef\csname the#2\endcsname{%
    \expandafter\noexpand\csname the#3\endcsname.%
    \noexpand#1{#2}}%
}
%    \end{macrocode}
%
% \end{macro}
%
% \begin{macro}{\removefromreset}
%
% Does the obvious thing.
%
%    \begin{macrocode}
\def\removefromreset#1#2{%
  \begingroup%
  \def\@tempa{#1}%
  \toks@{}%
  \def\@elt##1{%
    \def\@tempb{##1}%
    \ifx\@tempa\@tempb%
    \else\toks@\expandafter{\the\toks@\@elt{##1}}%
    \fi%
  }
  \csname cl@#2\endcsname%
  \expandafter\xdef\csname cl@#2\endcsname{\the\toks@}%
  \endgroup%
}
%    \end{macrocode}
%
% \end{macro}
%
% \subsection{Enumerated lists}
%
% We busily redefine all the counters for enumerated lists, and how to
% typeset them.
%
% How to typeset the numbers:
%
%    \begin{macrocode}
\renewcommand\theenumi{\arabic{enumi}}
\renewcommand\theenumii{\alph{enumii}}
\renewcommand\theenumiii{\roman{enumiii}}
\renewcommand\theenumiv{\Alph{enumiv}}
%    \end{macrocode}
%
% Typesetting the item labels:
%
%    \begin{macrocode}
\newcommand\labelenumi{\theenumi.}
\newcommand\labelenumii{(\theenumii)}
\newcommand\labelenumiii{\theenumiii.}
\newcommand\labelenumiv{\theenumiv.}
%    \end{macrocode}
%
% And finally how to typeset references to the items:
%
%    \begin{macrocode}
\renewcommand\p@enumii{\theenumi}
\renewcommand\p@enumiii{\theenumi(\theenumii)}
\renewcommand\p@enumiv{\p@enumiii\theenumiii}
%    \end{macrocode}
%
% \subsection{Itemized lists}
%
% We set up the various bullet shapes for the itemized lists.
%
%    \begin{macrocode}
\newcommand\labelitemi{$\m@th\bullet$}
\newcommand\labelitemii{\normalfont\bfseries --}
\newcommand\labelitemiii{$\m@th\ast$}
\newcommand\labelitemiv{$\m@th\cdot$}
%    \end{macrocode}
%
% \subsection{Description lists}
%
% This has been redefined a little to make it more sensible.  The old version
% had a weird |\hspace\labelsep| in the labelling macro.  This has now been
% added into the main list definition.  You can now redefine
% |\descriptionlabel| without fear of messing up the spacing.
%
% \begin{environment}{description}
%
% Here we set up the main list parameters.  The label width is zeroed to
% ensure that the text is always indented nicely.
%
%    \begin{macrocode}
\def\description{%
  \list{}{%
    \labelwidth\z@%
    \itemindent-\leftmargin%
    \advance\itemindent\labelsep%
    \def\makelabel{\descriptionlabel}%
  }%
}
\let\enddescription\endlist
%    \end{macrocode}
%
% \begin{macro}{\descriptionlabel}
%
% This typesets a description label.  Redefine it the obvious way for
% different exciting effects.
%
%    \begin{macrocode}
\def\descriptionlabel#1{\normalfont\bfseries #1}
%    \end{macrocode}
%
% \end{macro}
% \end{environment}
%
% \subsection{Other list-based environments}
%
% Several other standard environments are defined in terms of lists.  These
% are all dealt with here.
%
% \begin{environment}{verse}
%
% The \env{verse} environment is specially fiddled so that |\\| works as it
% should.  There's nothing else exciting about it.
%
%    \begin{macrocode}
\newenvironment{verse}{%
  \let\\\@centercr%
  \list{}{%
    \itemsep\z@%
    \itemindent-1.5em%
    \listparindent\itemindent%
    \rightmargin\leftmargin%
    \advance\leftmargin1.5em%
  }%
  \item[]%
}{%
  \endlist%
}
%    \end{macrocode}
% \end{environment}
%
% \begin{environment}{quotation}
%
% The \env{quotation} environment is a pretty standard display, except that
% we kill off inter-paragraph space.  The current definition means that
% \env{quotation}s are typeset in normal indented-paragraph style, which
% is inconsistent with the rest of the document style.
%
%    \begin{macrocode}
\newenvironment{quotation}{%
  \list{}{%
    \listparindent\z@%
    \itemindent\listparindent%
    \rightmargin\leftmargin%
  }%
  \item[]%
}{%
  \endlist%
}
%    \end{macrocode}
% \end{environment}
%
% \begin{environment}{quote}
%
% This is even simpler.  We just pull in the right margin a bit.
%
%    \begin{macrocode}
\newenvironment{quote}{%
  \list{}{%
    \rightmargin\leftmargin%
  }%
  \item[]%
}{%
  \endlist%
}
%    \end{macrocode}
% \end{environment}
%
% \begin{environment}{display}
%
% The \env{display} environment is intended for any other displays which you
% need to typeset.  This is \emph{not} a standard environment.
%
%    \begin{macrocode}
\newenvironment{display}{%
  \list{}{%
    \leftmargin1em%
    \rightmargin\leftmargin%
    \labelsep\z@%
    \labelwidth\z@%
  }%
  \item[]\relax%
}{%
  \endlist%
}
%    \end{macrocode}
% \end{environment}
%
% And some quick hacking of the theorem environment.
%
% \section{Other parameters}
%
% We define some miscellaneous parameters for standard environments.
%
%    \begin{macrocode}
\arraycolsep5\p@
\tabcolsep6\p@
\arrayrulewidth.4\p@
\doublerulesep2\p@
\tabbingsep\labelsep
\skip\@mpfootins\skip\footins
\fboxsep3\p@
\fboxrule.4\p@
%
\if@article
  \renewcommand\theequation{\arabic{equation}}
\else
  \@addtoreset{equation}{chapter}
  \renewcommand\theequation{\thechapter.\arabic{equation}}
\fi
%    \end{macrocode}
%
% \section{Floats}
%
% Since raw \LaTeX\ doesn't actually define any floating objects, we have
% to do some of the work here.  This isn't actually terribly arduous.  For
% a float called \synt{float}, we have to define the following macros:
%
% \begin{description}
% \let\descriptionlabel\relax
%
% \item[\texttt{\bslash fps@}\synt{float}] is the default float positioning
% argument for the float type.
%
% \item[\texttt{\bslash ftype@}\synt{float}] is a flag bit for the float
% type.  This is used in \LaTeX's |\output| routine to identify floats of
% this type.
%
% \item[\texttt{\bslash ext@}\synt{float}] is the file extension for the
% list of these floats (e.g., \lit{lof} for figures).
%
% \item[\texttt{\bslash fnum@}\synt{float}] is a macro which generates the
% caption number.  For figures, this expands to `|Figure~\thefigure|'.
%
% \end{description}
%
% We must also define |\@makecaption|, which typesets a float caption in
% an appropriate way, and an environment for each type of float.
%
% \subsection{Figures}
%
% This is all fairly straightforward stuff.  First, we create a counter for
% figures:
%
%    \begin{macrocode}
\newcounter{figure}[chapter]
\if@article
  \renewcommand\thefigure{\@arabic\c@figure}
\else
  \renewcommand\thefigure{\thechapter.\@arabic\c@figure}
\fi
%    \end{macrocode}
%
% Now we define all the macros \LaTeX\ requires.
%
%    \begin{macrocode}
\if@herefloats\def\fps@figure{htbp}\else\def\fps@figure{tbp}\fi
\def\ftype@figure{1}
\def\ext@figure{lof}
\def\fnum@figure{\figurename~\thefigure}
%    \end{macrocode}
%
% \begin{environment}{figure}
% \begin{environment}{figure*}
%
% Finally, we create the \env{figure} and \env{figure$*$} environments.
%
%    \begin{macrocode}
\newenvironment{figure}{\@float{figure}}{\end@float}
\newenvironment{figure*}{\@dblfloat{figure}}{\end@dblfloat}
%    \end{macrocode}
% \end{environment}
% \end{environment}
%
% \subsection{Tables}
%
% This is pretty similar to the figure handling.
%
%    \begin{macrocode}
\newcounter{table}[chapter]
\if@article
  \renewcommand\thetable{\@arabic\c@table}
\else
  \renewcommand\thetable{\thechapter.\@arabic\c@table}
\fi
%
\if@herefloats\def\fps@table{htbp}\else\def\fps@table{tbp}\fi
\def\ftype@table{2}
\def\ext@table{lot}
\def\fnum@table{\tablename~\thetable}
%
\newenvironment{table}{\@float{table}}{\end@float}
\newenvironment{table*}{\@dblfloat{table}}{\end@dblfloat}
%    \end{macrocode}
%
% \subsection{Other float parameters}
%
% \begin{macro}{\@makecaption}
%
% The |\@makecaption| macro is called to display a float caption.  It will
% typeset its argument either centred in a box, if it is short enough, or
% in a paragraph if it is longer than a line.
%
%    \begin{macrocode}
\newlength\abovecaptionskip
\newlength\belowcaptionskip
\abovecaptionskip10\p@
\belowcaptionskip0\p@
%
\long\def\captionstyle#1#2{\itshape #1: #2}
\long\def\@makecaption#1#2{%
  \vskip\abovecaptionskip%
  \sbox\@tempboxa{\captionstyle{#1}{#2}}%
  \ifdim\wd\@tempboxa>\hsize%
    \unhbox\@tempboxa\par%
  \else%
    \hb@xt@\hsize{\hfil\unhbox\@tempboxa\hfil}%
  \fi%
  \vskip\belowcaptionskip%
}
%    \end{macrocode}
% \end{macro}
%
% \section{Font commands}
%
% We allow the `old' font commands to do sensible \textsf{NFSS} things, since
% we don't have any legacy documents.  This means that we have proper
% abbreviations for font changes.  We also add |\nm| to return to a normal
% font, whatever that may mean.
%
%    \begin{macrocode}
\DeclareOldFontCommand{\rm}{\rmfamily}{\mathrm}
\DeclareOldFontCommand{\sf}{\sffamily}{\mathsf}
\DeclareOldFontCommand{\tt}{\ttfamily}{\mathtt}
\DeclareOldFontCommand{\bf}{\bfseries}{\mathbf}
\DeclareOldFontCommand{\md}{\mdseries}{\@nomath\md}
\DeclareOldFontCommand{\it}{\itshape}{\mathit}
\DeclareOldFontCommand{\up}{\upshape}{\@nomath\up}
\DeclareOldFontCommand{\sl}{\slshape}{\@nomath\sl}
\DeclareOldFontCommand{\sc}{\scshape}{\@nomath\sc}
\DeclareOldFontCommand{\nm}{\normalfont}{\mathnormal}
%    \end{macrocode}
%
% Now we define some special commands which only work in maths mode.  It
% seems that older versions of \LaTeX\ (in particular, that at Warwick
% University) don't define these commands initially, so we'd better not
% use |\renewcommand| after all.  We also dispose of lots of messing with
% |\protect| by using |\DeclareRobustCommand|.
%
%    \begin{macrocode}
\DeclareRobustCommand\cal{\@fontswitch{\relax}{\mathcal}}
\DeclareRobustCommand\pmit{\@fontswitch{\relax}{\mathnormal}}
%    \end{macrocode}
%
% \section{Tables of contents}
%
% This section deals with tables of contents, and lists of figures.
%
% \subsection{Contents}
%
% First, we have to define some parameters.
%
%    \begin{macrocode}
\newcommand\@pnumwidth{2em}
\newcommand\@tocrmarg {3em}
\newcommand\@dotsep{4.5}
\setcounter{tocdepth}{\if@runinsubsubsec1\else2\fi}
%    \end{macrocode}
%
% \begin{macro}{\tableofcontents}
%
% This is the main command for setting up tables of contents.  We ensure
% a single-page layout, put in the chapter heading, read in the contents
% file, and then restore the old layout.
%
%    \begin{macrocode}
\def\@tocthing#1#2{%
  \@ifnextchar[{\@tocthing@i{#1}{#2}}{\@tocthing@i{#1}{#2}[\relax][\relax]}%
}
\def\@tocthing@i#1#2[#3][#4]{%
  \if@twocolumn\@restonecoltrue\onecolumn\else\@restonecolfalse\fi%
  \@topsect@star{#1}#3{\parskip\z@\@starttoc{#2}}#4%
  \if@restonecol\twocolumn\fi%
}
\newcommand\tableofcontents{\@tocthing\contentsname{toc}}
%    \end{macrocode}
% \end{macro}
%
% Each section type \synt{type} is typeset by a command |\l@|\synt{type}:
% for example, the |\l@chapter| command typesets the entry for a chapter
% heading.
%
% \begin{macro}{\l@part}
%
% This command is vaguely interesting.  We'll explore in detail.
%
%    \begin{macrocode}
\def\l@part#1#2{%
%    \end{macrocode}
%
% We don't typeset the entry if |tocdepth| tells us not to.  What kind of
% stupid user is going to disable \emph{all} the contents items.
%
%    \begin{macrocode}
  \ifnum\c@tocdepth>-2\relax%
%    \end{macrocode}
%
% Before we start, we try to break above the title.  Later, we'll disable
% breaking afterwards.  We then leave some vertical space.
%
%    \begin{macrocode}
    \addpenalty{-\@highpenalty}%
    \addvspace{2.25em\@plus\p@}%
%    \end{macrocode}
%
% We open a group, to avoid messing other things up.  The |\numberline|
% macro, which numbers the entry on the left, typesets its argument in a box
% of width |\@tempdima|, which we must set up.  We then set up the values
% of |\rightskip| and |\parfillskip| to avoid printing over the page number.
% We also make |\interlinepenalty| infinite to suppress breaking pages in
% the middle of the title.
%
%    \begin{macrocode}
    \begingroup%
      \@tempdima3em%
      \parindent\z@%
      \rightskip\@pnumwidth%
      \parfillskip-\@pnumwidth%
      \interlinepenalty\@M
%    \end{macrocode}
%
% Time to typeset the actual title.  This is fairly simple, apart from
% a complicated mixture of glue and penalties, which handles a line break
% right at the end of the title.
%
%    \begin{macrocode}
      {%
        \leavevmode%
        \large\bfseries {#1}%
        \nobreak\hfil\penalty\@highpenalty\hbox{}\nobreak\hfil%
        \hb@xt@\@pnumwidth{\hss #2}%
      }%
%    \end{macrocode}
%
% Now we end the paragraph and suppress page breaking here.
%
%    \begin{macrocode}
      \par%
      \nobreak%
      \global\@nobreaktrue%
      \everypar{\global\@nobreakfalse\everypar{}}%
    \endgroup%
  \fi%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@artsw}
%
% Define a macro named after the first or second argument depending on
% whether the document is an article.
%
%    \begin{macrocode}
\def\@artsw#1#2#3{%
  \edef\@tempa{#1\if@article\noexpand#3\else\noexpand#2\fi}%
  \@tempa%
}
%    \end{macrocode}
%
% \end{macro}
%
% \begin{macro}{\l@chapter}
%
% This is terribly similar to the previous macro.
%
%    \begin{macrocode}
\@artsw\def\l@chapter\l@section#1#2{%
  \ifnum\c@tocdepth >\m@ne%
    \addpenalty{-\@highpenalty}%
    \vskip1.0em\@plus\p@%
    \setlength\@tempdima{2em}%
    \begingroup%
      \interlinepenalty\@M
      \parindent\z@%
      \rightskip\@pnumwidth%
      \parfillskip-\@pnumwidth%
      \leavevmode%
      \bfseries%
      \advance\leftskip\@tempdima%
      \hskip-\leftskip%
      {#1}%
      \nobreak\hfil\penalty\@highpenalty\hbox{}\nobreak\hfil%
      \hb@xt@\@pnumwidth{\hss #2}%
      \par%
      \penalty\@highpenalty%
    \endgroup%
  \fi%
}
%    \end{macrocode}
% \end{macro}
%
% The other types are all defined in terms of |\@dottedtocline|, which is
% redefined beloew.
%
%    \begin{macrocode}
\@artsw\def\l@section\l@subsection{\@dottedtocline{1}{2em}{2.5em}}
\@artsw\def\l@subsection\l@subsubsection{\@dottedtocline{2}{4.5em}{3.2em}}
\@artsw\def\l@subsubsection\l@paragraph{\@dottedtocline{3}{7.7em}{4.1em}}
\@artsw\def\l@paragraph\l@subparagraph{\@dottedtocline{4}{10.5em}{5em}}
\@artsw\def\l@subparagraph\@tempa{\@dottedtocline{5}{12.5em}{6em}}
%    \end{macrocode}
%
% \begin{macro}{\@dottedtocline}
%
% This is actually a part of the \LaTeX\ kernel, although it's not quite
% right the way it is.  We've improved the handling of line breaks after the 
% title.
%
%    \begin{macrocode}
\def\@dottedtocline#1#2#3#4#5{%
%    \end{macrocode}
%
% We have to make sure that we're meant to typeset this contents entry.
%
%    \begin{macrocode}
  \ifnum#1>\c@tocdepth\else%
%    \end{macrocode}
%
% Now we add in a little stretchy space.
%
%    \begin{macrocode}
    \vskip\z@\@plus.2\p@%
%    \end{macrocode}
%
% Set up the paragraph layout now.  We forbid page breaks in the middle of
% the title.
%
%    \begin{macrocode}
    {%
      \leftskip#2\relax%
      \rightskip\@tocrmarg%
      \parfillskip-\rightskip%
      \parindent#2\relax%
      \@afterindenttrue%
      \interlinepenalty\@M%
%    \end{macrocode}
%
% Now we typeset the actual title.
%
%    \begin{macrocode}
      \leavevmode%
      \@tempdima#3\relax%
      \advance\leftskip\@tempdima%
      \hbox{}%
      \hskip-\leftskip%
      {#4}%
%    \end{macrocode}
%
% This is the clever bit.  After the actual title, we add the following
% items:
%
% \begin{itemize}
%
% \item A |\nobreak| penalty, to stop a break from eating the glue.
%
% \item A glob of |\hfil| glue.  If there's a line break after this glue,
% the title is set flush left as a result of this.  Otherwise, it is ignored
% because the leaders are |\hfill|.
%
% \item A penalty.  This is a reasonable place to break the line if
% necessary.
%
% \item An empty |\hbox|.  This stops the following glue from being discarded
% at the beginning of a new line.
%
% \item Another |\nobreak|, which stops a break at the following glue item.
%
% \item The dotted |\leaders|, which have |\hfill| stretchiness.  This forces
% the page number to be flush right.
%
% \end{itemize}
%
% The net result of all this is we can now cope with a line break at the
% end of the title, before the page number, which means that the dots are
% put on the next line.  The original \LaTeX\ version forced the last word
% of the title onto the next line as well, which can cause underful boxes.
%
%    \begin{macrocode}
      \nobreak\hfil\penalty\@highpenalty\hbox{}\nobreak%
      \leaders\hbox{$\m@th\mkern\@dotsep mu.\mkern\@dotsep mu$}\hfill%
      \hb@xt@\@pnumwidth{\hfil\reset@font\rmfamily#5}\par%
    }%
  \fi%
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Lists of figures and tables}
%
% These macros are terribly similar to the other ones.
%
%    \begin{macrocode}
\newcommand\listoffigures{\@tocthing\listfigurename{lof}}
\newcommand\l@figure{\@dottedtocline{0}{0pt}{2em}}
\newcommand\listoftables{\@tocthing\listtablename{lot}}
\let\l@table\l@figure
%    \end{macrocode}
%
% \section{Bibliography}
%
% This isn't actually terribly interesting.
%
% \begin{environment}{thebibliography}
%
%    \begin{macrocode}
\newdimen\bibindent
\bibindent1.5em
%
\newenvironment{thebibliography}[1]{%
  \@topsect\bibname%
  \list{\@biblabel{\arabic{enumiv}}}%
  {\settowidth\labelwidth{\@biblabel{#1}}%
  \leftmargin\labelwidth%
  \advance\leftmargin\labelsep%
  \if@openbib%
    \advance\leftmargin\bibindent%
    \itemindent-\bibindent%
    \listparindent\itemindent%
    \parsep\z@%
  \fi%
  \usecounter{enumiv}%
  \let\p@enumiv\@empty%
  \renewcommand\theenumiv{\arabic{enumiv}}}%
  \if@openbib%
    \renewcommand\newblock{\par}%
  \else%
    \renewcommand\newblock{\hskip.11em\@plus.33em\@minus.07em}%
  \fi%
  \sloppy%
  \clubpenalty4000%
  \widowpenalty4000%
  \sfcode`\.\@m%
}{%
  \def\@noitemerr{\@latex@warning{Empty `thebibliography' environment}}%
  \endlist%
}
%
\newcommand\newblock{}
%    \end{macrocode}
% \end{environment}
%
% \section{Index}
%
% Defines the \env{theindex} environment.
%
% \begin{environment}{theindex}
%
% The macros are fairly simple.  We change to a two column layout, and
% redefine |\item| appropriately.
%
%    \begin{macrocode}
\newenvironment{theindex}{%
  \columnseprule\z@%
  \columnsep35\p@%
  \@topsect\indexname%
  \if@twocolumn\else%
    \begin{multicols}{2}%
  \fi%
  \parskip\z@\@plus.3\p@\relax%
  \raggedright%
  \let\item\@idxitem%
}{%
  \if@twocolumn\else%
    \end{multicols}%
  \fi%
}
%    \end{macrocode}
% \end{environment}
%
% Now we define the item and spacing macros.
%
%    \begin{macrocode}
\newcommand\@idxitem  {\par\hangindent 40\p@}
\newcommand\subitem   {\par\hangindent 40\p@ \hspace*{20\p@}}
\newcommand\subsubitem{\par\hangindent 40\p@ \hspace*{30\p@}}
\newcommand\indexspace{\par \vskip 10\p@ \@plus5\p@ \@minus3\p@\relax}
%    \end{macrocode}
%
% \begin{macro}{\passim}
%
% The |passim| encapsulator is used to typeset the word `\textit{passim}'
% after a page range.
% 
%    \begin{macrocode}
\def\passim#1{#1 \textit{passim}}       % Passim encapsulator for indices
%    \end{macrocode}
% \end{macro}
%
% Other useful commands for indexing:
%
% \begin{description*}
% \def\descriptionlabel#1{\ttfamily \bslash #1}
%
% \item[Term] typesets its argument in italics, and adds it to the index.
%
% \item[term] typesets its first argument in italics, and adds its second
%   to the index.
%
% \item[Index] typesets its argument normally, and adds it to the index.
%
% \end{description*}
%
%    \begin{macrocode}
\def\Term#1{\emph{#1}\index{#1}}
\def\term#1{\emph{#1}\index}
\def\Index#1{#1\index{#1}}
%    \end{macrocode}
%
% \section{Footnotes}
%
% \begin{macro}{\footnoterule}
%
% This macro typesets the rule above footnotes.  This is a bit more complex
% than the default: we try and typeset the rule to be at most 1\,in wide,
% although if the column isn't wide enough, we use $4\over10$~of the
% box width instead.
%
%    \begin{macrocode}
\def\footnoterule{%
  \@tempdima.4\columnwidth%
  \ifdim\@tempdima>1in\relax%
    \@tempdima1in\relax%
  \fi%
  \kern-3\p@%
  \hrule\@width\@tempdima%
  \kern2.6\p@%
}
%    \end{macrocode}
% \end{macro}
%
% We number footnotes within chapters:
%
%    \begin{macrocode}
\@addtoreset{footnote}{chapter}
%    \end{macrocode}
%
% \begin{macro}{\@makefntext}
%
% This is the macro which actually typesets a footnote.  This is rather
% complicated.  It's based on example code from \file{classes.dtx} which
% doesn't actually work properly.
%
%    \begin{macrocode}
\long\def\@makefntext#1{%
%    \end{macrocode}
%
% First, we redefine |\par| to set up the correct paragraph shape.  This
% is indented from the left margin by a small amount.
%
%    \begin{macrocode}
  \@setpar{%
    \@@par%
    \@tempdima\hsize%
    \advance\@tempdima-1.6em%
    \parshape\@ne1.6em\@tempdima%
  }%
%    \end{macrocode}
%
% Now we set up some parameters so that \env{list} environments work properly
% within the footnote.  We also clear |\parindent| to prevent nasty
% indentation.  The |\par| sets up the paragraph shape for the next
% paragraph: we're in vertical mode already, so it does nothing else.
%
%    \begin{macrocode}
  \advance\linewidth-1.6em%
  \advance\@totalleftmargin1.6em%
  \par%
  \parindent\z@%
%    \end{macrocode}
%
% We leave vertical mode to stop the hbox created by |\llap| from being
% stacked vertically.  Then we typeset the footnote mark, and put in the
% main text.  Finally we leave some space afterwards, to space out the next
% footnote.
%
%    \begin{macrocode}
  \leavevmode%
  \llap{\@makefnmark\enspace}#1\par%
  \vskip\parskip%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@makecol}
%
% The standard \LaTeX\ output routine messes up footnotes a bit, in my
% opinion:
% \begin{itemize}
%
% \item If a page is cut off short, because the next item won't fit (e.g.,
%       a section heading), then footnotes are added right below the end
%       of the text, which can look strange.
%
% \item Footnotes are displayed \emph{above} floats at the bottom of a page,
%       which also looks strange.
%
% \item The |\@makefntext| routine above needs to add vertical space between
%       footnotes, but this leaves a gap at the very bottom.  We remove this
%       gap with an |\unskip|.
%
% \end{itemize}
%
%    \begin{macrocode}
\def\@makecol{%
   \setbox\@outputbox \box\@cclv
   \xdef\@freelist{\@freelist\@midlist}%
   \global \let \@midlist \@empty
   \@combinefloats
   \ifvoid\footins \else
     \setbox\@outputbox \vbox {%
       \boxmaxdepth \@maxdepth                   
       \unvbox \@outputbox
       \vskip \skip\footins
       \vfil
       \footnoterule
       \unvbox \footins
       \unskip
       }%
   \fi
   \ifvbox\@kludgeins
     \@makespecialcolbox
   \else
     \setbox\@outputbox \vbox to\@colht {%
       \@texttop
       \dimen@ \dp\@outputbox
       \unvbox \@outputbox
       \vskip -\dimen@
       \@textbottom
       }%
   \fi
   \global \maxdepth \@maxdepth
}
%    \end{macrocode}
% \end{macro}
%
% \section{Tidying up}
%
% This section gathers together various other useful bits of standard
% document class setting.
%
% \subsection{Item names}
%
% These commands typeset bits of text.  They can then be redefined by
% \package{babel} and suchlike.
%
%    \begin{macrocode}
\newcommand\contentsname{Contents}
\newcommand\listfigurename{List of figures}
\newcommand\listtablename{List of tables}
\if@article\newcommand\bibname{References}
\else\newcommand\bibname{Bibliography}\fi
\newcommand\indexname{Index}
\newcommand\figurename{Figure}
\newcommand\tablename{Table}
\newcommand\partname{Part}
\newcommand\abstractname{Abstract}
\newcommand\chaptername{Chapter}
\newcommand\appendixname{Appendix}
\newcommand\today{\number\day\space\ifcase\month\or
  January\or February\or March\or April\or May\or June\or
  July\or August\or September\or October\or November\or December\fi
  \space\number\year}
%    \end{macrocode}
%
% \subsection{Final fiddling for two columns}
%
%    \begin{macrocode}
\columnsep10\p@
\columnseprule\z@
\pagestyle{headings}
\pagenumbering{arabic}      % Arabic page numbers
\if@twocolumn
  \twocolumn
  \sloppy
  \flushbottom
\else
  \onecolumn
\fi
%    \end{macrocode}
%
% \section{The \protect\env{central} environment}
%
% Because of the strange layout of the pages, text which is centred using
% normal \LaTeX\ commands is centred in the text area, not on the page,
% which is undesirable for large headings, like part headings.
%
% \begin{environment}{central}
%
% The \env{central} environment typesets its contents centrally on the page.
% It should only be used from outer vertical mode.
%
% The code just creates a box of the appropriate size and moves it into the
% right place.
%
%    \begin{macrocode}
\newenvironment{central}{%
  \par%
  \vbox\bgroup\moveleft\leftindent\vbox\bgroup%
  \textwidth\paperwidth%
  \advance\textwidth-2\pagesurround\relax%
  \hsize\textwidth%
  \hrule\@height\z@\@depth\z@\@width\hsize%
}{%
  \egroup%
  \egroup%
}
%    \end{macrocode}
% \end{environment}
%
% \section{Headers and footers}
%
% The \strayman\ class uses \package{fancyheadings} for its headers
% and footers.  This has already been included in the preamble.  We now
% need to fix a few problems with \package{fancyheadings} and set up some
% macros.
%
% \begin{macro}{\title}
%
% We extend |\title|, and give it an optional argument.  It can now specify
% the document title as used by |\maketitle| and the running title for the
% header separately.
%
% We store the running header in the macro |\@headertitle|, which is
% initially empty.
%
%    \begin{macrocode}
\def\@headertitle{}
%    \end{macrocode}
%
% Now we define the |\title| macro, using |\@dblarg| to duplicate the
% mandatory argument if the optional one is omitted.
%
%    \begin{macrocode}
\def\title{\@dblarg\title@i}
\def\title@i[#1]#2{%
  \gdef\@title{#2}%
  \gdef\@headertitle{#1}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\innerhead}
% \begin{macro}{\innerfoot}
%
% We allow the user to specify an `inner heading' which is displayed on the
% inside of the header on of each page.  This can be used for security
% classifications, for example.  Any \package{fancyheadings} commands can
% be used to control the header, which is expanded on each page.
%
%    \begin{macrocode}
\def\l@innerhead{}
\def\r@innerhead{}
\def\l@innerfoot{}
\def\r@innerfoot{}
\def\innerhead{\@dblarg\innerhead@i}
\def\innerhead@i[#1]#2{%
  \def\l@innerhead{#1}%
  \def\r@innerhead{#2}%
}
\def\innerfoot{\@dblarg\innerfoot@i}
\def\innerfoot@i[#1]#2{%
  \def\l@innerfoot{#1}%
  \def\r@innerfoot{#2}%
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% The next step is to set up the headings:
%
%    \begin{macrocode}
\let\headrulewidth\z@
\headwidth\textwidth
  \advance\headwidth\leftindent
\fancypagestyle{headings}{%
  \fancyhf{}
  \fancyhead[LE]{\bfseries\@headertitle}
  \if@article\fancyhead[RO]{\rightmark}\else\fancyhead[RO]{\leftmark}\fi
  \fancyhead[RE]{\l@innerhead} \fancyhead[LO]{\r@innerhead}
  \fancyfoot[RE]{\l@innerfoot} \fancyfoot[LO]{\r@innerfoot}
  \fancyfoot[LE,RO]{\thepage}
}
\fancypagestyle{plain}{%
  \fancyhf{}%
  \fancyfoot[RE]{\l@innerfoot} \fancyfoot[LO]{\r@innerfoot}
  \fancyfoot[LE,RO]{\thepage}%
}
\let\ps@fancy\ps@@fancy
%    \end{macrocode}
%
% The \package{fancyheadings} package by default expects pages to be
% symmetrical.  We have to redefine the |\ps@fancy| macro to make it
% work properly.
%
%    \begin{macrocode}
\def\@lodd{\ifodd\c@page\hss\else\relax\fi}
\def\@rodd{\ifodd\c@page\relax\else\hss\fi}
%    \end{macrocode}
%
% Finally, we can choose the page style we want:
%
%    \begin{macrocode}
\pagestyle{headings}
%    \end{macrocode}
%
% \section{Parbox alteration}
%
% The standard \LaTeX\ |\parbox| command, and the \env{minipage} environment,
% reset |\parskip| to zero, which is inconsistent with the document style.
% We amend |\@arrayparboxrestore|, the macro which sets up the paragraph
% style for parboxes.
%
% First, we define a macro explaining how the parbox should set the spacing.
%
%    \begin{macrocode}
\def\parboxparskip{2ex}
%    \end{macrocode}
%
% Next, we redefine the macro.  This is taken directly from the \LaTeXe
% source.
%
%    \begin{macrocode}
\def\@arrayparboxrestore{%
  \let\par\@@par
  \let\-\@dischyph
  \let\'\@acci\let\`\@accii\let\=\@acciii
  \parindent\z@ \parskip\z@
  \everypar{\parskip\parboxparskip\everypar{}}%
  \linewidth\hsize
  \@totalleftmargin\z@ 
  \leftskip\z@skip \rightskip\z@skip \@rightskip\z@skip
  \parfillskip\@flushglue \lineskip\normallineskip
  \baselineskip\normalbaselineskip
  \@noskipsectrue%      % The comp.text.tex gurus said it should be
  \sloppy}
%    \end{macrocode}
%
%
% \section{Other features}
%
% At the end is a miscellany of useful features.
%
% \subsection{Other typesetting conventions}
%
% Some items need typesetting in particular ways.
%
%    \begin{macrocode}
\let\key\textit
\let\button\textbf
\def\submenu{\ensuremath\Rightarrow}
\let\name\relax
\def\file#1{\mbox{\itshape #1\/}}
%    \end{macrocode}
%
% \subsection{And finally}
%
%    \begin{macrocode}
\sloppy
\raggedbottom
\def\riscos{RISC~OS}
\hyphenpenalty1000
%</strayman>
%    \end{macrocode}
%
% \Finale
%
\endinput