[Tex/LaTex] An index of nested subitems, indented, and hyperlinked

hyperrefindexingnestingxindy

Background

Looking to indent an arbitrary n-level hierarchy within an index and have hyperlinks for the final item, using the memoir class and pdfTeX 3.1415926-2.4-1.40.13 (TeX Live 2012).

For example:

\index[classification]{Anthropoidea!Hominoidea!Hominidae!Homo!sapiens}

Should produce:

mockup

Where the 2 in "sapiens, 2" is hyperlinked back in the document (PDF).

Problem

First, makeindex can only nest 3-levels deep. Second, xindy is incompatible with hyperref; from the man page:

In particular, this means that by default the LaTeX package "hyperref" will create raw index files that cannot be processed with xindy. This is not a bug, this is the unfortunate result of an intented [sic] incompatibility. It is currently not possible to get both hyperref's index links and use xindy.

Question

How would you create hyperlinked indexes that nest to an arbitrary depth?

Example Document

A minimal document might resemble:

\documentclass{memoir}
\usepackage{filecontents}

\begin{filecontents*}{style1.xdy}
(markup-index :open  "~n\begin{theindex}~n"
              :close "~n\end{theindex}~n"
              :tree)
(markup-indexentry :open "~n            \sssssubitem "  :depth 5)
\end{filecontents*}

\long\def\lettergroup#1\item{\item\textbf}
\let\lettergroupDefault\lettergroup

\usepackage{makeidx}
\makeindex

\begin{document}
Start

\index{Anthropoidea!Hominoidea!Hominidae!Homo!sapiens}

End
\printindex
\end{document}

However, this does not produce the correct results, when run with:

pdflatex file.tex; texindy file.idx; pdflatex file.tex

Related Links

Best Answer

\documentclass{memoir}
\usepackage{filecontents}

\begin{filecontents*}{style1.xdy}
(markup-locref :open "\hyperpage{" :close "}")

(markup-index :open  "~n\begin{theindex}~n"
              :close "~n\end{theindex}~n"
          :tree
              )
(markup-indexentry :open "~n       \sssubitem " :depth 3) 
(markup-indexentry :open "~n            \sssssubitem "  :depth 4)
(markup-indexentry :open "~n            \sssssssubitem "  :depth 5)
\end{filecontents*}

\long\def\lettergroup#1\item{\item\textbf}
\let\lettergroupDefault\lettergroup
\makeatletter
\newcommand\sssubitem{\@idxitem \hspace*{40\p@}}
\newcommand\sssssubitem{\@idxitem \hspace*{50\p@}}
\newcommand\sssssssubitem{\@idxitem \hspace*{60\p@}}

\makeatother
\usepackage{makeidx}
\makeindex
\usepackage{hyperref}
\begin{document}
Start

\index{Anthropoidea!Hominoidea!Hominidae!Homo!sapiens}


End
\printindex
\end{document}

You can use hyperref macro \hyperpage to link to the indexed page. With 

(markup-locref :open "\hyperpage{" :close "}")

you tell xindy to enclose page numbers with this macro.

For more hierarchical levels, you can use 

(markup-indexentry :open "~n       \sssubitem " :depth 3) 
(markup-indexentry :open "~n            \sssssubitem "  :depth 4)
(markup-indexentry :open "~n            \sssssssubitem "  :depth 5)

and define macros like \sssubitem:

\newcommand\sssubitem{\@idxitem \hspace*{40\p@}}

Compile with 

pdflatex filename
texindy -M style1 filename.idx
pdflatex filename

You must tell texindy to use the module with -M option.

The result:

hiearchical index

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