Get current "section" name without label

Not exactly an answer to your question but maybe useful to others:

The Beamer class provides the commands \secname and \subsecname to get the current sections or subsections name.

This example produces a frame containing the text "Current section: Foo":

\documentclass{beamer}
\begin{document}
  \section{Foo}
  \begin{frame}
    Current section: \secname
  \end{frame}
\end{document}

Variations of the same theme. All the title-/nameref packages have to remember the current title somewhere.

Package nameref

\documentclass{article}

\usepackage{nameref}
\makeatletter
\newcommand*{\currentname}{\@currentlabelname}
\makeatother

\begin{document}

\section{My section name}
The name of the current section is: "\currentname".\\
It should be: "My section name".

\subsection{My subsection name}
The name of the current subsection is: "\currentname".\\
It should be: "My subsection name".

\end{document}

Result with nameref

Package titleref

\documentclass{article}

\usepackage{titleref}
\makeatletter
\newcommand*{\currentname}{\TR@currentTitle}
\makeatother

\begin{document}

\section{My section name}
The name of the current section is: "\currentname".\\
It should be: "My section name".

\subsection{My subsection name}
The name of the current subsection is: "\currentname".\\
It should be: "My subsection name".

\end{document}

Same result.

Package zref-titleref

\documentclass{article}

\usepackage{zref-titleref}
\makeatletter
\newcommand*{\currentname}{\zref@getcurrent{title}}
% or \newcommand*{\currentname}{\zref@titleref@current}
\makeatother

\begin{document}

\section{My section name}
The name of the current section is: "\currentname".\\
It should be: "My section name".

\subsection{My subsection name}
The name of the current subsection is: "\currentname".\\
It should be: "My subsection name".

\end{document}

Same result.


If you use the standard classes that rely on the kernel commands for making headers, then here's a possibility that works unmodified if the class is article (removing the \chapter command, of course).

\documentclass{book}

\usepackage{etoolbox}
\makeatletter
\newif\if@chapters
\@ifundefined{chapter}{\@chaptersfalse}{\@chapterstrue}
\if@chapters
  \apptocmd{\@chapter}{\gdef\currentname{#1}}{}{}
  \apptocmd{\@schapter}{\gdef\currentname{#1}}{}{}
\fi
\apptocmd{\@sect}{\gdef\currentname{#7}}{}{}
\def\currentname{---Still no title given---}
\makeatother

\begin{document}

\chapter{ABC}

\currentname

\section{My section name}
The name of the current section is: ``\currentname''
It should be: ``My section name''

\subsection{My subsection name}
The name of the current subsection is: ``\currentname''
It should be: ``My subsection name''

\end{document}

For the memoir class there's nothing to do: the class already provides \currenttitle that does exactly what you want.

Note that you shouldn't redefine \todo as you're trying; rather do

\makeatletter
\renewcommand\todo[2][]{\@todo[#1]{\currentname: #2}}
\makeatother

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