General ⇒ Making a new environment based on the listing environment

[csmgroup]

I need to make a new environment based on the listing environment.

I'd like to have this code.

Code: Select all

\definecolor{darkgray}{rgb}{0.97,0.97,0.97}
\lstset{backgroundcolor=\color{darkgray}, 
           columns=fullflexible, 
           basicstyle=\ttfamily\footnotesize, 
           numbers=left, 
           numberstyle=\tiny, 
           stepnumber=2, 
           numbersep=5pt}
\begin{lstlisting}[frame=tb]
var capital = Map("US" -> "Washington", "France" -> "Paris") 
capital += ("Japan" -> "Tokyo")
\end{lstlisting}

as this

Code: Select all

\begin{mycode}
var capital = Map("US" -> "Washington", "France" -> "Paris") 
capital += ("Japan" -> "Tokyo")
\end{mycode}

I came up with the newenvironment as follows, but it doesn't work.

Code: Select all

\documentclass{article}

\newenvironment{mycode}%
{
\lstset{columns=fullflexible, 
           basicstyle=\ttfamily\footnotesize, 
           numbers=left, 
           numberstyle=\tiny, 
           stepnumber=2, 
           numbersep=5pt}
\begin{lstlisting}[frame=tb]
}
{\end{lstlisting}}

\begin{document}
\begin{mycode}
Hello, world.
\end{mycode}
\end{document}

This is the error code.

Code: Select all

ERROR: Undefined control sequence.

--- TeX said ---
\mycode -> \lstset 
                   {columns=fullflexible, basicstyle=\ttfamily \footnotesize...
l.16 \begin{mycode}

What's wrong with this?

[Juanjo]

In your minimal example you forgot to load listings. Anyway, verbatim-like environments cannot be defined in the usual way. Check subsection 4.16 in the manual of the listings package.

[csmgroup]

Thanks for the answer.