2

I want to define a command with an optional star argument and be able to use it inside pdf strings, e.g. via \section. With the MWE below, I get a Token not allowed in a PDF string warning and \foo is just removed.

I can't think of a safe expandable way to replace \@ifstar in order to do this. For my application, it would be okay to default to \s@foo inside a pdf string, but the * should be removed if present.

Is there any way to achieve this?


\documentclass{article}

\usepackage{hyperref}

\makeatletter
  \protected\def\foo{%
    \@ifstar\s@foo\@foo
  }
  \def\@foo#1{one #1 one}
  \def\s@foo#1{two #1 two}
\makeatother

\begin{document}

\section{\foo{bar}}

\end{document}
  • Depending on what you're actually trying to do, you can use \texorpdfstring{regular tex}{inside pdf string} from hyperref. – Teepeemm Aug 27 at 11:51
4

With xparse, of course ;-)

\documentclass{article}
\usepackage{xparse}
\usepackage{hyperref}
\NewExpandableDocumentCommand \foo { s m }
  {%
    \IfBooleanTF{#1}
      {one #2 one}% Starred
      {two #2 two}% Non-starred
  }
\begin{document}
\section{\foo*{bar}}
\section{\foo{baz}}
\end{document}

The command that goes into the PDF bookmark has to be expandable, so you need an expandable mechanism to grab the optional *. Same goes for optional [...] arguments.

In the code above, the PDF bookmarks are one bar one and two baz two.

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