LaTeX lstlisting underlined

Question

Hi,

Is there an easy way to have the complete code in a lstlisting environment underlined? My current solution looks like this, but I'm not really happy with it.

\begin{lstlisting}[mathescape]
   $\ul{if(gt(x1, 0)) then} $
   ...
\end{lstlisting}

Thanks for any tips.

Answer 1

According to page 5 in the user guide (found here):

\lstset{keywordstyle=\underbar} 

Answer 2

If you want to underline the entire line (and not only the keywords), the best solution I can come up with is to do something along the lines below:

\usepackage{listings}

\newcommand{\lstul}[1]{\underline{\mbox{\tt #1}}}

\begin{document}

\begin{lstlisting}[mathescape]
  $\lstul{if condition}$
      $\lstul{statement 1}$
  $\lstul{statement 2}$
  ...
\end{lstlisting}


\end{document}