How can I use versions.sty to change a section header?

Question

I am trying to have different section headers in different versions of a document using versions.sty (0.55). I get and error while compiling; here is a MWE :

%!TEX encoding = UTF-8 Unicode
%!TEX TS-program = pdflatexmk 
\documentclass{article}

\usepackage{versions}
\includeversion{draft}

\begin{document}
\section{\begin{draft}This is a draft of\end{draft} Introduction}
Some text
\end{document}

The error is :

Argument of \@sect has an extra }.
<inserted text> 
                \par 
l.9 ...This is a draft of\end{draft} Introduction}

Any suggestion? Thanks!

Answer 1

Using \section{\protect\begin{draft}This is a draft of\protect\end{draft} Introduction} works for the headline and the ToC, but not for the page header.

The versions package also offeres the macro \processifversion, which can be used here. It works for all three, head line, ToC, and page header.

Edit:

The space between of and Introduction must be part of the optional content. Otherwise it will appear in the headline, if \excludeversion is used. And \protect can't be used, because with it, This is a draft of will appear in the heading regardless of \excludeversion. This doesn't look nice in the source, but the space logicaly belongs to the draft content.

\documentclass{article}

\usepackage{versions}
\includeversion{draft}

\pagestyle{headings}

\begin{document}
\tableofcontents

\newpage
\section{\protect\processifversion{draft}{This is a draft of }Introduction}
% watch the  space -----------------------------------------^
Some text
\end{document}