Jobname of inputted file?

Question

\begin{filecontents}{foo.tex}
\def\foo{\jobname}
\end{filecontents}
\documentclass{article}

\begin{document}
\input{foo}
\foo
\end{document}

This outputs the jobname of the main file not "foo". How can I define a macro that outputs the jobname of the inputted file?

\edef doesn't work either.

Answer 1

Use the package currfile, which keeps track of the file name of the input file in the macros

\currfiledir
\currfilebase
\currfileext
\currfilename
\currfilepath

Furthermore, \edef has to be used to expand these values within the input file, not when you are back in the main file:

\begin{filecontents}{foo.tex}
\edef\foo{\currfilebase}
\end{filecontents}
\documentclass{article}
\usepackage{currfile}
\begin{document}
\input{foo}
\foo
\end{document}