[Tex/LaTex] Custom numbering of listings

counterslistingsnumbering

I have a number of listings in my document, numbered 1, 2, 3 and so on.
I need a table with three listings (say, three different variants of the same algorithm), that will be numbered as 2a, 2b, 2c. The very next listing would be numbered as 3.

Best Answer

you can also save the current counter value to make it independent from the current counter setting.

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

\begin{lstlisting}[caption=foo]
 foo
\end{lstlisting}

\setcounter{lstlisting}{0}
\renewcommand\thelstlisting{2.\alph{lstlisting}}
\begin{lstlisting}[caption=foo]
 foo
\end{lstlisting}
\begin{lstlisting}[caption=foo]
 foo
\end{lstlisting}
\begin{lstlisting}[caption=foo]
 foo
\end{lstlisting}

\renewcommand\thelstlisting{\arabic{lstlisting}}
\setcounter{lstlisting}{2}
\begin{lstlisting}[caption=foo]
 foo
\end{lstlisting}

\end{document}

Code:

\documentclass{article}
\usepackage{xcolor}
\usepackage{listings}

\newcounter{main}
\setcounter{main}{1}

\lstnewenvironment{code}[1][firstnumber=\themain,name=main]
  {\lstset{language=haskell,
           basicstyle=\small\ttfamily,
           numbers=left,
           numberstyle=\tiny\color{gray},
           backgroundcolor=\color{lightgray},
           #1
          }
}
{\setcounter{main}{\value{lstnumber}}}


\begin{document}
\begin{code}
 foo bar first line
 foo bar second line
 foo bar third line
\end{code}

some text

\begin{lstlisting}[backgroundcolor=\color{lightgray!20}]
  some other non-code listing
\end{lstlisting}


\begin{code}
 listing continued
\end{code}
\end{document}

[Tex/LaTex] How to make “sub-level” numbering for listings, similar to subcaption

\documentclass{article}

\usepackage{listings}
\AtBeginDocument{\DeclareCaptionSubType{lstlisting}}
\usepackage{caption,subcaption}

\begin{document}

\lstlistoflistings

\begin{figure}[!ht]
\captionsetup{type=lstlisting}
\begin{sublstlisting}{\linewidth}
\begin{lstlisting}
test listing one
\end{lstlisting}
\caption{Caption for first listing}
\label{lst:file1}
\end{sublstlisting}
\begin{sublstlisting}{\linewidth}
\begin{lstlisting}
test listing two
\end{lstlisting}
\caption{Caption for second listing}
\label{lst:file2}
\end{sublstlisting}
\caption{General caption for all 3}
\label{lst:general}
\end{figure}

As we can see in Listings~\ref{lst:file1} and~\ref{lst:file2}...

\end{document}

This solution was taken from Gonzalo Medina, and the tricks 1 to 4 have been replaced by a different one:

The listings package defines some stuff needed for captions \AtBeginDocument, so \DeclareCaptionSubType won't work straight-forward on lstlisting. Unfortunately the (sub)caption package needs to do important stuff \AtBeginDocument, too, and \DeclareCaptionSubType must be executed before that stuff. So in total I use \AtBeginDocument{\DeclareCaptionSubType{lstlisting}} after loading the listings package but before loading the (sub)caption package to make it work.

This way we don't need an extra counter, no counter saving, no manual counter incrementation, no suppressing of the list entry, and no doing the list entry by hand.

(If the listings should not float just replace the figure environment by a minipage environment.)

P.S.: For details on \DeclareCaptionSubType just take a look at my subcaption package documentation.

Best Answer

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[Tex/LaTex] Create a \lstnewenvironment that creates named listings

Code:

[Tex/LaTex] How to make “sub-level” numbering for listings, similar to subcaption

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