showexpl

\usepackage{showexpl}
\lstset{%
    basicstyle=\ttfamily\small,
    commentstyle=\itshape\ttfamily\small,
    showspaces=false,
    showstringspaces=false,
    breaklines=true,
    backgroundcolor=\color{eggshell},
    breakautoindent=true,
    captionpos=b
}