% indexes document style option for producing multiple indexes
% for use with the modified bbok style, CHbook.sty
% Written by F.W. Long, Version 1.1, 12 August 1991.

% Modified by F.W. Long, Version 1.1a, 29 August 1991
% to get the index heading correctly spaced.

% Modified by F.W. Long, Version 1.1b, 31 August 1991
% to remove the abbreviation \ix (which should be in the document, not here).

% Modified \makeindex and \index commands to allow multiple indexes
% in both cases the first parameter is the index name.
% They now work more like \@starttoc and \addcontentsline.
% \index is no longer defined inside \makeindex but determines
% whether the appropriate file is defined before writing to it.

\def\makeindex#1{\begingroup
  \makeatletter
  \if@filesw \expandafter\newwrite\csname #1@idxfile\endcsname
  \expandafter\immediate\openout \csname #1@idxfile\endcsname #1.idx\relax
  \typeout{Writing index file #1.idx }\fi \endgroup}

\def\index#1{\@bsphack\begingroup
               \def\protect##1{\string##1\space}\@sanitize
               \@wrindex{#1}}

% \@wrindex now checks that the appropriate file is defined.

\def\@wrindex#1#2{\let\thepage\relax
   \xdef\@gtempa{\@ifundefined{#1@idxfile}{}{\expandafter
      \write\csname #1@idxfile\endcsname{\string
      \indexentry{#2}{\thepage}}}}\endgroup\@gtempa
   \if@nobreak \ifvmode\nobreak\fi\fi\@esphack}

% Modified \printindex command to allow multiple indexes.
% This now takes over much of the work of \theindex.
% Again, the first parameter is the index name.
% The second parameter is the index title (as printed).

\newif\if@restonecol
\def\printindex#1#2{\@restonecoltrue\if@twocolumn\@restonecolfalse\fi
  \columnseprule \z@ \columnsep 35pt
  \newpage \twocolumn[{\Large\bf #2 \vskip4ex}]
  \markright{\uppercase{#2}}
  \addcontentsline{toc}{section}{#2}
  \@input{#1.ind}}

% The following index commands are taken from book.sty.
% \theindex is modified to not start a chapter.

\def\theindex{\parindent\z@
 \parskip\z@ plus .3pt\relax\let\item\@idxitem}
\def\@idxitem{\par\hangindent 40pt}
\def\subitem{\par\hangindent 40pt \hspace*{20pt}}
\def\subsubitem{\par\hangindent 40pt \hspace*{30pt}}
\def\endtheindex{\if@restonecol\onecolumn\else\clearpage\fi}
\def\indexspace{\par \vskip 10pt plus 5pt minus 3pt\relax}

% the command \ix allows an abbreviation for the general index

%\def\ix#1{#1\index{general}{#1}}

% define the \see command from makeidx.sty

\def\see#1#2{{\em see\/} #1}
