%% gatech-thesis-index.sty - support code for creating an index
%%   depends on index.sty, so it is not included by default in the
%%   main gatech-thesis.cls (this cuts down on ``extra'' dependencies.
%%   It also depends on the multicol package.
%%
%% Note that index.sty is included in the ``camel'' package if you
%% are using MikTeX.
%%
%% To use this package, all you need do is include
%%   \usepackage{gatech-thesis-index}
%% in your preamble, and 
%%   \gtindex
%% just after your vita section, but within the postliminary environment
%% of your bodytext.  The, the index will be automatically
%% and included in the location specified, and added to the table of
%% contents.  Of course, you need actual index references within your
%% main text like this:
%%   foo\index{foo}
%% Read the index.sty documentation for more info, but basically 
%% gatech-thesis-gloss.sty makes it simple:
%%    1. insert the \usepackage and \gtindex commands into your document
%%    2. sprinkle \index{} citations in your text
%%    3. run ``makeindex'' on the <rootfile>.idx file created
%%       after the first ``latex'' run, like this:
%%         makeindex -s gatech-thesis-index.ist <rootfile>.idx
%%       This will create <rootfile>.ind (the gatech-thesis-index.ist
%%       file is a format specification for the index).  If you want
%%       to customize the index format, copy gatech-thesis-index.ist to
%%       ``myformat.ist'' and change the copy.  Use ``-s myformat.ist'' 
%%       instead of gatech-thesis-index.ist.
%%          You can run the makeindex command at the same time you run `
%%       `bibtex'' for your references and/or glossary.
%%    4. run ``latex'' twice more (the same ``twice more'' needed for
%%       bibtex and gatech-thesis-gloss.sty)
%%
\NeedsTeXFormat{LaTeX2e}[1995/06/01] \ProvidesPackage{gatech-thesis-index}
          [2002/08/08  Index support for gatech-thesis.cls]
\@ifclassloaded{gatech-thesis}{}{
  PackageError{This style can only be used with the gatech-thesis class}
}
\RequirePackage{index}
\RequirePackage{multicol}

\newif\if@proofmode
\@proofmodefalse

\DeclareOption{proofmode}{%
  \if@draft        % This is an internal gatech-thesis variable!
    \@proofmodetrue % this is an internal index.sty variable
  \else
    \PackageWarn{option `proofmode' can't be used in 'final' mode.}
    \@proofmodefalse
  \fi
}
\DeclareOption{showidx}{%
  \if@draft        % This is an internal gatech-thesis variable!
    \@proofmodetrue % this is an internal index.sty variable
  \else
    \PackageWarn{option `showidx' can't be used in 'final' mode.}
    \@proofmodefalse
  \fi
}
\ProcessOptions

\newif\ifindexpage
\indexpagetrue% why use this package if you're not going to USE it?

\if@proofmode
  \proofmodetrue% pass option to index package
\else
  \proofmodefalse% ditto
\fi

\newcommand{\gtindexname}{}
\newcommand{\idxcontentlinestring}{}
\newcommand{\idxpdfbookmarkstring}{}

\newcommand{\setindexstring}[1]{%
  \renewcommand{\gtindexname}{#1}
  \renewcommand{\indexname}{\Makeuppercase{#1}}
  \renewcommand{\idxcontentlinestring}{%
    \texorpdfstring{\Makeuppercase{#1}}{#1}
  }
  \renewcommand{\idxpdfbookmarkstring}{#1}
}
\setindexstring{Index}
% if you want to change the name of the index, do it in the preamble
% once the document begins, it''s too late.
\AtBeginDocument{%
  \newindex{default}{idx}{ind}{Index}
}

\renewenvironment{theindex}{%
  \edef\indexname{\the\@nameuse{idxtitle@\@indextype}}%
  \if@twocolumn
    \@restonecolfalse
  \else
    \@restonecoltrue
  \fi
  \chapter*{\MakeUppercase{\gtindexname}}
  \@mkboth{\scshape\MakeUppercase\indexname}%
          {\scshape\MakeUppercase\indexname}%
  \let\item\@idxitem
  \columnseprule \z@
  \columnsep 35\p@
  \begin{multicols}{2}[%
    \ifx\index@prologue\@empty\else
      \index@prologue
      \bigskip
    \fi]%    
    \parindent\z@
    \parskip\z@ \@plus .3\p@\relax
}{\end{multicols}%
  \if@restonecol
    \onecolumn
  \else
    \clearpage
  \fi
}

\renewcommand{\do@indexpage}{%
  \ifindexpage
    \if@openright\cleardoublepage\else\clearpage\fi 
    % must clear page here, so that phantomsection\addcontentsline is on the correct page
    \phantomsection%
    \addcontentsline{toc}{chapter}{\idxcontentlinestring}
    \settoheight{\gt@tmpa}{A}
    \set@gttocskip{\gt@tmpa}
    {\newlinestretch{1}
     \printindex
    }%
    \newpage
  \fi
}

\newcommand{\gtindex}{\do@indexpage}
\newcommand{\bs}{\symbol{'134}}% print backslash
\newcommand{\gtCom}[1]{\texttt{\bs#1}\index{#1@\texttt{\bs#1}}}
\newcommand{\gtProg}[1]{\texttt{#1}\index{#1@\texttt{#1} program}}
