Indenting lines in an index

Question

I'm typesetting the index for a book. When an entry covers more than one line I would like the lines after the first to be indented some small amount. Is there a simple way to do it by playing with the way paragraphs are indented?

Here's a MWE:

\documentclass[a4paper,10pt]{book}

\usepackage[top=53mm, bottom=45mm, left=40mm, right=40mm]{geometry}

\begin{document}

\noindent arithmetic [VOL I] V, VII-VIII, IX, XIII, 1, 3-4, 39 fn.\,1, [VOL II] 70 fn.\,1, 73, 77-78, 83-84, 86-88, 95, 97-104, 109, 117,  119, 123-125, 139, 139 fn.\,2, 141-142, 146-147, 149, 151-152, 154, 155 fn.\,1, 156-157, 162, 168, 253, 255, 257, 265.\\

\end{document}

I'd like to indent at 83-84 and 151-152. The point is I would like it to happen automatically for a long index rather than add space by hand.

Answer 1

You may use my idxlayout package to change the hanging indentation of \items in a manually created theindex environment. Note that for a one-column index you have to add \par at the end of the last \item for the settings to take effect. In the following example, I've also added code to remove the "Index" chapter heading and header.

\documentclass[a4paper,10pt]{book}

\usepackage[top=53mm, bottom=45mm, left=40mm, right=40mm]{geometry}

\usepackage[columns=1,hangindent=2em]{idxlayout}

\usepackage{etoolbox}

\makeatletter
\patchcmd{\ila@prologue}{\chapter*{\indexname}}{}{}{}
\patchcmd{\ila@prologue}{\@mkboth}{\@gobbletwo}{}{}
\makeatother

\begin{document}

\begin{theindex}
\item arithmetic [VOL I] V, VII-VIII, IX, XIII, 1, 3-4, 39 fn.\,1, [VOL II] 70 fn.\,1, 73, 77-78, 83-84, 86-88, 95, 97-104, 109, 117,  119, 123-125, 139, 139 fn.\,2, 141-142, 146-147, 149, 151-152, 154, 155 fn.\,1, 156-157, 162, 168, 253, 255, 257, 265.\par
\end{theindex}

\end{document}