1.1 --- a/doc-src/extra.sty	Mon Aug 21 19:29:27 2000 +0200
     1.2 +++ b/doc-src/extra.sty	Tue Aug 22 10:59:15 2000 +0200
     1.3 @@ -1,6 +1,10 @@
     1.4  % extra.sty : Isabelle Manual extra macros for non-Springer version
     1.5  %
     1.6 -\typeout{Document Style extra. Released 17 February 1994}
     1.7 +\typeout{Document Style extra. Released 17/2/94, version of 22/8/00}
     1.8 +
     1.9 +\usepackage{ttbox}
    1.10 +{\obeylines\gdef\ttbreak
    1.11 +{\allowbreak}}
    1.12  
    1.13  %%Euro-style date: 20 September 1955
    1.14  \def\today{\number\day\space\ifcase\month\or
    1.15 @@ -8,29 +12,6 @@
    1.16  July\or August\or September\or October\or November\or December\fi
    1.17  \space\number\year}
    1.18  
    1.19 -%%Borrowed from alltt.sty, but leaves % as the comment character
    1.20 -\def\docspecials{\do\ \do\$\do\&%
    1.21 -  \do\#\do\^\do\^^K\do\_\do\^^A\do\~}
    1.22 -
    1.23 -\def\alltt{\trivlist \item[]\if@minipage\else\vskip\parskip\fi
    1.24 -\leftskip\@totalleftmargin\rightskip\z@
    1.25 -\parindent\z@\parfillskip\@flushglue\parskip\z@
    1.26 -\@tempswafalse \def\par{\if@tempswa\hbox{}\fi\@tempswatrue\@@par}
    1.27 -\obeylines \tt \catcode``=13 \@noligs \let\do\@makeother \docspecials
    1.28 - \frenchspacing\@vobeyspaces}
    1.29 -
    1.30 -\let\endalltt=\endtrivlist
    1.31 -
    1.32 -%Indented, boxed alltt environment; uses \small\tt font
    1.33 -%\leftmargini is LaTeX's first-level indentation for items (2.5em)
    1.34 -%@endparenv is LaTeX's trick for preventing indentation of next paragraph
    1.35 -%redefines \{ and \} to be in \tt font
    1.36 -\newenvironment{ttbox}{\par\nobreak\vskip-2pt
    1.37 -           \vbox\bgroup\footnotesize\begin{alltt}\chardef\{=`\{\chardef\}=`\}%
    1.38 -             \leftskip\leftmargini}%
    1.39 -        {\end{alltt}\egroup\vskip-7pt\@endparenv}
    1.40 -\newcommand\ttbreak{\end{ttbox}\vskip-10pt\begin{ttbox}}
    1.41 -
    1.42  %%%Put first chapter on odd page, with arabic numbering; like \cleardoublepage
    1.43  \newcommand\clearfirst{\clearpage\ifodd\c@page\else
    1.44      \hbox{}\newpage\if@twocolumn\hbox{}\newpage\fi\fi