Surtitle for section?

Question

I'm writing a book in which I would like certain sections to have a "surtitle" like this:

I would probably like the table of contents entry to look like "Science and Society: The Galileo Affair," and the page header to say "The Galileo Affair."

The closest I can think of is something like this:

\section[The Galileo Affair]{Science and Society: The Galileo Affair}

But this won't give me the visual layout shown above, and the initial part of the title won't appear in the TOC.

Is there any package that gives a straightforward way to accomplish this?

Answer 1

You can try this code. Use \sectionsurtitle{....} before the sections where you want the surtitle. Note that you can used a starred version \sectionsurtitle* for unnumbered sections.

\documentclass{scrartcl}
\usepackage{lipsum}

\usepackage{suffix}

\newcommand\sectionsurtitle[1]{\surtitletoc{#1}\printsectionsurtitle{#1}}
\WithSuffix\newcommand\sectionsurtitle*[1]{\printsectionsurtitle{#1}}

\makeatletter
\newcommand{\printsectionsurtitle}[1]{%
  {\parindent0pt\vspace*{20pt}%
  \sffamily\uppercase{#1}%
  \par\nobreak}
  \@afterheading%
}
\newcommand{\surtitletoc}[1]{%
  \addtocontents{toc}{%
    \protect\contentsline{section}%
    {\mdseries\sffamily\protect\scriptsize\uppercase{#1}}{}{}}
  \addtocontents{toc}{\vskip-10pt}%
}
\makeatother

\begin{document}
\tableofcontents

\bigskip

\sectionsurtitle{Science and society}
\section{The Galileo Affair}
\lipsum[1]

\sectionsurtitle{Art}
\section{The Michelangelo Affair}
\lipsum[1]

\section{A normal section}
\lipsum[1]

\sectionsurtitle*{Nothing}
\section*{A unnumbered section}
\lipsum[1]
\end{document} 

Output:

---

EDIT

After your comment I think that you can use this code:

\documentclass{scrbook}
\usepackage{lipsum}

\usepackage{suffix}

\newcommand\sectionsurtitle[2]{\printsectionsurtitle{#1}\section[#1: #2]{#2}\sectionmark{#2}}
\WithSuffix\newcommand\sectionsurtitle*[2]{\printsectionsurtitle{#1}\section*{#2}}

\makeatletter
\newcommand{\printsectionsurtitle}[1]{%
  {\parindent0pt\vspace*{20pt}%
  \sffamily\uppercase{#1}%
  \par\nobreak}
  \@afterheading%
}
\makeatother

\begin{document}
\tableofcontents

\bigskip

\chapter{Test}

\sectionsurtitle{Science and society}{The Galileo Affair}
\lipsum[1]

\sectionsurtitle{Art}{The Michelangelo Affair}
\lipsum[1]

\section{A normal section}
\lipsum[1]

\sectionsurtitle*{Nothing}{A unnumbered section}
\lipsum[1]
\end{document} 

Output:

and the ToC

Answer 2

I'd go with a key-value syntax:

\documentclass[openany]{book}
\usepackage{titlesec}
\usepackage{xparse}

\titleformat{\section}
  {\normalfont\Large\sffamily\printcurrentsurtitle}
  {\thesection}
  {1em}
  {}

\ExplSyntaxOn

\keys_define:nn { crowell/section }
 {
  surtitle .tl_set:N = \l_crowell_section_surtitle_tl,
  toc      .tl_set:N = \l_crowell_tocentry_tl,
  header   .tl_set:N = \l_crowell_header_tl,
 }

\NewDocumentCommand{\Section}{sO{}m}
 {
  \keys_set:nn { crowell/section }
   {
    surtitle = {},
    toc = { #3 },
    header = { #3 },
    #2
   }
  \IfBooleanTF{#1}
    {\section*{#3}}
    {
     \section[
       \tl_if_empty:NF \l_crowell_section_surtitle_tl
        { \l_crowell_section_surtitle_tl : ~ }
       \l_crowell_tocentry_tl
     ]{#3}
     \markright{\l_crowell_header_tl}
    }
 }

\NewDocumentCommand{\printcurrentsurtitle}{ }
 {
  \tl_if_empty:NF \l_crowell_section_surtitle_tl
   {
    \mbox{\normalsize\MakeUppercase{\l_crowell_section_surtitle_tl}}\par
   }
 }

\ExplSyntaxOff

\begin{document}

\tableofcontents

\chapter{Title}

\Section[surtitle=Science and Society]{The Galileo Affair}

\Section{No surtitle for this one}

\Section*[surtitle=Unnumbered]{Section}

\Section[
  surtitle=Science and Society,
  header=TGA,
  toc=Abbrev
]{The Galileo Affair}

\newpage
\mbox{}

\end{document}

Here is the TOC

Note that the value given for toc= is what's added next to the surtitle in the TOC; in the header you'll get the section title, or what's specified as value for header= (in this case page 3 will have “TGA”.