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% Package manyind.sty, Wilberd van der Kallen 2019.
%
% Variation on \usepackage[multind]{robustindex}, now without pagerefs in indexes.
% https://www.staff.science.uu.nl/~kalle101/mind.html
%
% Copyright 2019 Wilberd van der Kallen
%
% This file may be distributed under the conditions of the LaTeX Project Public
% License, either version 1.2 of this license or (at your option) any
% later version.  The latest version of this license is in
%    http://www.latex-project.org/lppl.txt
% and version 1.2 or later is part of all distributions of LaTeX
% version 1999/12/01 or later.


\ProvidesPackage{manyind}
  [2019/01/28
  many indexes]

\RequirePackage{makeidx}


\AtBeginDocument{\def\ind@nr#1{\string\indnr\mindchoice d\gr@bltr#1-\relax b{} #1}%
\ifx\@@wrindex\undefined
\def\@wrindex#1{\@bsphack 
\protected@write
    \@indexfile {}{\string \indexentry
    {\ind@nr #1}{\thepage}}%
  \endgroup
\@esphack}%
\else
\def\@wrindex#1{\@@wrindex\ind@nr#1||\\}%
\fi
\setindex{main}}%

\AtEndDocument{%
\PackageWarning{manyind}{There are \the\c@mindexctr\space indexes. Did you run makeindex
recently?}%
}%

\newcommand{\ind@nr}{\relax}% We prepend the argument of \index with a string used by
% makeindex for its lexicographic sorting. Thus it ends up in the ind file in a place 
% based on which index is active and what the first letter of the index entry is.

\newcommand{\@sindex}{\relax}

\newcommand{\@@sindex}{\relax}

\newcommand\sindex{\@ifnextchar[{\@sindex}{\@@sindex}}%

\def\@sindex[#1]{\setindex{#1}\index}

\def\@@sindex{\setindex{main}\index}

\newcommand{\mind@prnt}{\relax}

\newcommand{\mind@@prnt}{\relax}

\newcommand{\mind@@@prnt}{\relax}

\newcommand{\mind@@@@prnt}{\relax}

\def\mind@@prnt[#1]{\setindex{#1}\mind@@@prnt}

\let\mind@prnt\printindex

\renewcommand{\printindex}{\@ifnextchar[{\mind@@prnt}{\mind@prnt}}%

\renewcommand{\mind@@@prnt}{\@ifnextchar[{\mind@@@@prnt}{\mind@prnt}}

\def\mind@@@@prnt[#1]{\renewcommand{\indexname}{#1}\mind@prnt}

\newcommand{\indexpreamble}{\relax}% compare the preamble of makeindex

\newcommand{\indexincontents}{%
  \def\indexpreamble{%
     \refstepcounter{subsection}%
   % This creates a hyperlink destination.
   % Compare phantomsection in hyperref.
   % An index is not to be followed immediately by a subsection.
     \addcontentsline{toc}%
        {\ifx\c@chapter\undefined section\else chapter\fi}{\indexname}%
  }%
}%

\newcommand{\old@theindex}{}%

\let\old@theindex\theindex


\def\theindex{%
   \old@theindex
   \indexpreamble
}%

\newcommand{\mgobblepgeref}{\relax}

\def\mgobblepgeref, #1 {}

\newcommand{\gobblepageref}{\protect\mgobblepgeref}

\newcommand{\gr@bltr}{\relax}%

\def\gr@bltr#1#2\relax{\ifcat A#10\the\uccode`#1\else 060\fi}%
% to keep "a" and "A" together.

\newcommand{\altsort}% to place some entries after the alphabet
{\def\gr@bltr##1##2\relax{\ifcat A##10\the\uccode`##1\else##1\fi}}

% But first some code for embellishing an index. Our hacking brakes the insertion of 
% \indexspace at appropriate places. We have to work hard to restore that. While we
% are at it, we may as well add the possibility to insert a letter T after the
% \indexspace that precedes the entries that start with t or T.
% First we describe the default style, that does not insert the T.
\newcommand{\indexcapstyle}[1]{\indexspace}
% To get the T one changes the style like this
% \renewcommand{\indexcapstyle}[1]{\indexspace\textbf{#1}\par}%

\newcommand{\nxtletre}{\def\item{\letr@test}}% about next letter in alphabet

\newcommand{\mindc@pitalhead}[1]{% Preparing for a heading; not printed.
  \protected@write
    \@indexfile {}{\string \indexentry
    {\string\indnr \mindchoice d\gr@bltr#1\relax a @\protect\nxtletre
    \protect\def\protect\nwletre{#1}\string\jmptonine}{9}}%          
}%

\newcommand{\extraheaders}{\relax}

\newcommand{\capitals@inindex}[1]{% Will be called by \mnew@index with full alphabet.
\extraheaders
\mfind@capitals#1\relax}%

\newcommand{\mfind@capitals}{\relax}%

\def\mfind@capitals#1#2\relax{% To deal with 26 letters.
\mindc@pitalhead #1%
\ifx\relax#2\relax
\else\mfind@capitals#2\relax
\fi}%

\newcommand{\letr@test}{\relax}% To test if entry starts with new letter.

\long\def\letr@test#1{\ifx#1\nxtletre\else\proc@letter{#1}\fi}%

\newcommand{\proc@letter}{\relax}% 

\def\proc@letter#1#2{\long\def\item{\m@olditem}%
\ifx#1\relax\else\indexcapstyle{\nwletre}\fi\fi#1}%

\newcommand{\m@olditem}{\relax}%


% All this just to embellish an index. Now more support for multiple indexes.

\newcommand{\setindex}[1]{%
\@bsphack
\expandafter\ifx\csname#1@rbstind\endcsname\relax 
  \mnew@index{#1}%
\else
  \edef\mindchoice{\csname#1@rbstind\endcsname}%
\fi
\@esphack}%

\newcounter{multindctr}%
\newcounter{mindexctr}
\newcommand{\mindcutpoint}{\relax}%
\newcommand{\untilmindcutpoint}{\relax}%
\newcommand{\mnew@index}{\relax}%
\newcommand{\mindchoice}{\relax}%
\newcommand{\indnr}{\relax}%

\setcounter{multindctr}{999}% Fewer than 899 indexes expected.

\long\def\untilmindcutpoint#1\mindcutpoint{\fi}% 
% This tels the mouth of TeX not to send too much to the stomach.
% It should only forward the part that belongs to the active index.

\def\indnr#1 {}% The \indnr part is used for sorting by makeindex and needs to be ignored
               % by TeX thereafter.  

\newcommand\multindpreamble{\let\m@olditem\item}% 
% \multindpreamble may serve as hook for further code.

\newcommand{\jmptonine}{\relax}%

\def\jmptonine#1 9{\relax}

\def\mnew@index#1{\@bsphack
\ifx\@indexfile\undefined\PackageWarning{manyind}{%
Package needs \string\make index in preamble. Detected}\fi
\ifnum\c@multindctr=999%
  \protected@write
    \@indexfile {}{\string \indexentry
    {\string\indnr 999b @\string\mindcutpoint\string\jmptonine}{9}}%                              
  \@esphack
\fi
\addtocounter{multindctr}{-1}%
\expandafter\edef\csname#1@rbstind\endcsname{\the\c@multindctr}%
\edef\mindchoice{\csname#1@rbstind\endcsname}%
\stepcounter{mindexctr}
\PackageInfo{manyind}{index #1 has number \mindchoice.}%
\@esphack 
\protected@write
    \@indexfile {}{\string \indexentry
    {\string\indnr\the\c@multindctr d091 @\string
    \relax\string\jmptonine% restores \item
}{9}}% 
\protected@write
    \@indexfile {}{\string \indexentry
    {\string\indnr\the\c@multindctr a @%
    \string\mindcutpoint 
\string\ifnum\string\mindchoice=\the\c@multindctr\string\multindpreamble
\string\else\string\untilmindcutpoint
\string\fi\string\jmptonine
}{9}}% 
\capitals@inindex{ABCDEFGHIJKLMNOPQRSTUVWXYZ}%  
\@esphack
}%

\endinput