% $Header: /home/tampa_a/fac/levy/texts/geombook/RCS/index.sty,v 1.1 92/04/07 09:47:28 levy Exp $

\@ifundefined{@margin}{}{\endinput}

%
% index and glossary macros
%
% the basic user-level command is \index, which, in proof mode
% merely prints the entry on the left margin. To revert to
% index-making behavior, type \makeindex.
%

\newif\ifmakingindex\makingindexfalse
\def\makeindex{\if@filesw \newwrite\@indexfile
  \immediate\openout\@indexfile=\jobname.idx
  \makingindextrue\typeout{Writing index file \jobname.idx }\fi}

\def\index#1{\@bsphack\ifproofing\marginindex{#1}\fi\ifmakingindex\begingroup
  \set@key{#1}\@wrindex{\the\@key}\else\@esphack\fi}
\def\marginindex#1{{\everypar{}\insert\@margin{%
  \vbox{\marginstyle\strut #1\hfil\strut}}}}
\def\marginstyle{\tiny \hsize=1in \parindent=0pt \hangindent=10pt
  \hangafter=1 \rightskip=0pt plus 5em }
\newinsert\@margin \dimen\@margin=\maxdimen \count\@margin=0 \skip\@margin=0pt

%
% change in output routine to account for new insertion class
%
\def\@makecol{\ifvoid\footins \setbox\@outputbox\box\@cclv
   \else\setbox\@outputbox
     \vbox{\boxmaxdepth \maxdepth
     \unvbox\@cclv\vskip\skip\footins\footnoterule\unvbox\footins}\fi
     \xdef\@freelist{\@freelist\@midlist}\gdef\@midlist{}\@combinefloats
     \setbox\@outputbox\vbox to\@colht{\boxmaxdepth\maxdepth
        \@texttop\dimen128=\dp\@outputbox
        \ifvoid\@margin\else
          \llap{\vbox to0pt {\kern4pt\box\@margin \vss}\kern .1in}\fi
        \unvbox\@outputbox
        \vskip-\dimen128\@textbottom}
     \global\maxdepth\@maxdepth}

%
% But \index does not print its argument.  To index a word that
% actually appears in the text say \ix{...}. To index notation say \ixn$...$
% or \ixninv$...$, depending on whether the word should appear or not.
% And just for symmetry, you can also use \ixinv, which equals \index:
%
%                 Text              Notation
%
%  Visible        \ix               \ixn
%  Invisible      \ixinv            \ixninv
%
\def\ixinv{\index}      % must not use \let, since meaning changes
                        % under \makeindex
\def\ix#1{#1\index{#1}}
\def\ixninv$#1${\index{$#1$}}
\def\ixn$#1${$#1$\index{$#1$}}

%
% Some functions such as cross-referencing automatically invoke
% indexing.  The particular format is defined here.
% The xfs for \labelindex are needed because \index doesn't expand
%
\def\labelindex#1{\@xf\@xf\@xf\index
  \@xf\@xf\@xf{\@xf\cap@first\object@type\space``#1''}}
\def\refindex#1{\index{#1}}
{\catcode`\%=12 \gdef\refinvindex#1{\index{% #1}}}

% $Log:	index.sty,v $
%Revision 1.1  92/04/07  09:47:28  levy
%Initial revision
%