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I would like to get imakeidx to show the section name (or chapter, subsection, ...) rather than the page number. Is it possible?

I thought this was going to be easy, changing section and \thepage in the following, but I cannot find how to change it.

\documentclass[a5paper,11pt]{book}

\makeatletter
\usepackage{imakeidx}
\renewcommand{\imki@wrindexentrysplit}[3]{%
 \expandafter\protected@write\csname#1@idxfile\endcsname{}%
    {\string\indexentry{#2}{s\arabic{section},p\thepage}}%
}
\makeatother
\makeindex


\begin{document}


\section{Name for the index}


Thanks \index{thanks}


\printindex


\end{document}
Peruz
  • 123
  • Welcome to TeX.SE! Could you extend your code into a small example we can compile on our systems please? It is fine if it does not work but it just helps us help you if we can copy and paste straight away etc – JamesT Nov 07 '23 at 15:19
  • Thanks James, I hope this is now easier to answer. – Peruz Nov 07 '23 at 15:36

1 Answers1

2

This is achieved by my humble trying. Feel free to improve it.

This method is only working when you have numbered chapters and sections. Because the temporary macro '\tempsn\alph{chapter}\alph{section}' ,which store the section name, are named based on the counter of chapter and section. And total number of chapter and number of section inside one chapter are not exceed 26.

Using etoolbox patch the \@sect command to define a macro to store the section name. The macro's name is based on the current counter of chapter and section (e.g. when in chapter 2 section 3, the macro name is \tampsnbc).

Then \renewcommand{\imki@wrindexentrysplit}, replace the page number with the defined macro using \csname tampsn\alph{chapter}\alph{section}\endcsname. I also change the section number in form of "chapter.section". I think this is easier to locate which section is this index in. Now the index looks like this:

enter image description here

The code:

\documentclass[a5paper,11pt]{book}
\usepackage{etoolbox}
\usepackage{imakeidx}

\makeatletter
\patchcmd{@sect}{\csname #1mark\endcsname{#7}}{\csname #1mark\endcsname{#7}\expandafter\expandafter\def\csname tempsn\alph{chapter}\alph{#1}\endcsname{#7}}{}{}


\renewcommand{\imki@wrindexentrysplit}[3]{%
\expandafter\protected@write\csname#1@idxfile\endcsname{}%
{\string\indexentry{#2}%
{s\thesection:\string\kern1ex\expandafter\string\csname tempsn\alph{chapter}\alph{section}\endcsname}}%
}
\makeatother
\makeindex


\begin{document}
\tableofcontents
\chapter{Example one}
\section{Name for the index}
Thanks\index{thank you}


\clearpage
\chapter{Example two}
\section{A Long Long Long Long Long Long Name for the index}
Test\index{Zeta}
\section{new section}
New Test\index{alph}
\clearpage


\printindex


\end{document}
Tom
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