lstlisting inside lstlisting

[Peter Flynn]

How can I use the listings package (the lstlisting environment) to
document itself? I assumed that it would look only for a line beginning
\end{lstlisting} as the terminator, so I indented the actual content by
two spaces...but it still gives the error:

! Undefined control sequence.
\lstlisting ->\def \lstenv@name
{lstlisting}\begingroup \lst@setcatcodes
\ca...
l.15 \end{lstlisting}

! Package Listings Error: Extra \endlstlisting.

The documentation is clear that you can *follow* \end{lstlisting} with
text and have it honoured (unlike \end{verbatim}), but I can't find
anything about using the environment to document the environment itself :-)

///Peter

\documentclass{article}
\usepackage{listings}
\begin{document}
Some text

\begin{lstlisting}[language={[LaTeX]TeX}]
\begin{lstlisting}[language=R]
library(grid)
suppressPackageStartupMessages(library(ggplot2))

textwidth <- function(unit = "cm", valueOnly = FALSE) {
convertUnit(unit(15, "cm"), unit, valueOnly = valueOnly)
}
\end{lstlisting}
\end{lstlisting}

Some more text
\end{document}

[Denis Bitouzé]

Le jeudi 25/04/13 à 00h36,
Peter Flynn <pe...@silmaril.ie> a écrit :

> How can I use the listings package (the lstlisting environment) to
> document itself?

It is enough to store the LaTeX code in an external file and input it
thanks to \lstinputlisting macro:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass{article}
\usepackage{filecontents}
\begin{filecontents*}{R-listing}

\begin{lstlisting}[language=R]
library(grid)
suppressPackageStartupMessages(library(ggplot2))

textwidth <- function(unit = "cm", valueOnly = FALSE) {
convertUnit(unit(15, "cm"), unit, valueOnly = valueOnly)
}
\end{lstlisting}

\end{filecontents*}

\usepackage{listings}
\begin{document}
Some text

\lstinputlisting[language={[LaTeX]TeX}]{R-listing}

Some more text
\end{document}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
--
Denis

[Lars Madsen]

You would normally use one \lstnewenvironment to create a new
environment that behaves like lstlisting, but with a different name, and
then wrap your example in that environment