How to use normal label within a custom command for a definition of hypertarget?

Question

I want to make a command that defines a \hypertarget with the target label (first argument of \hypertarget) by the contained \label and the target caption (second argument of \hypertarget) by its content.

\documentclass{article}

\usepackage{hyperref}
\newcommand\mytargetcommand[1]{?}

\begin{document}
\mytargetcommand{My content\label{tag}}
\ref{tag}
\end{document}

So this would output My content twice where the second references to the first.

Answer 1

Perhaps there are better ways to split the My content\label{tag} stuff such that \hypertarget does not choke on \label: Use \def\splitcmd#1\label#2 and a similar command that splits the with undelimited arguments (actually, \label is the argument delimiter here).

This uses a dummy counter and to refer to the text, use \nameref instead.

\documentclass{article}

\usepackage{hyperref}
\makeatletter
% Two helper commands --> get the text before \label
\def\splitcmd#1\label#2{%
  #1%
}
% Get the label tag
\def\splitcmdother#1\label#2{%
  #2%
}


\newcounter{localtagcntr}


  \newcommand\mytargetcommand[1]{%
    \edef\local@tag{\splitcmdother#1}%
    \edef\my@text{\splitcmd#1}%
    \refstepcounter{localtagcntr}%
    \def\@currentlabelname{\my@text}% Change the label content name
    \label{\local@tag}% Set the label
    \hypertarget{\local@tag}{\my@text}% 
  }

\makeatother
\begin{document}
Foostuff
\clearpage
\mytargetcommand{My content\label{tag}}
\ref{tag}

\clearpage
\hyperlink{tag}{Stuff}

\nameref{tag}
\end{document}