Hi there,

Hi there,

I am typesetting code using minted or listings package. It works fine.
Now I am hoping to add a label, similar to equation label, on the left
side of the code block, looks like following. (%o1) is the label.

(%o1) code here here here
code here here
code here
code

However, I can't find a way to do this. Any hint will be appreciated.

Best wishes,

Jinsong

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Hi,

Le 03/03/25 à 12h03, Jinsong Zhao a écrit :

I am typesetting code using minted or listings package. It works fine. Now I am
hoping to add a label, similar to equation label, on the left side of the code
block, looks like following. (%o1) is the label.

(%o1) code here here here
code here here
code here
code

However, I can't find a way to do this. Any hint will be appreciated.

IIUC, what you're after is a way to “escape” in LaTeX within the
listing. This can be done thanks to the `escapechar` option of listing
(I guess minted provides it as well). Here a MWE:

--8<---------------cut here---------------start------------->8--- \documentclass{article}
\usepackage{listings}
\lstset{
basicstyle=\ttfamily,
numbers=left,
language=TeX,
alsolanguage=[LaTeX]TeX,
escapechar="
}
\begin{document}
In the following minimal file, the line~\ref{begin} begins the document and the line~\ref{end} ends the document.
\begin{lstlisting}
\documentclass{article}
\begin{document}"\label{begin}"
Foo
\end{document}"\label{end}"
\end{lstlisting}
\end{document}
--8<---------------cut here---------------end--------------->8---

Best regards.
--
Denis

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 2025/3/3 16:38, Denis Bitouzé wrote:

Hi,

Le 03/03/25 à 12h03, Jinsong Zhao a écrit :

I am typesetting code using minted or listings package. It works fine. Now I am
hoping to add a label, similar to equation label, on the left side of the code
block, looks like following. (%o1) is the label.

(%o1) code here here here
code here here
code here
code

However, I can't find a way to do this. Any hint will be appreciated.

IIUC, what you're after is a way to “escape” in LaTeX within the
listing. This can be done thanks to the `escapechar` option of listing
(I guess minted provides it as well). Here a MWE:

--8<---------------cut here---------------start------------->8--- \documentclass{article}
\usepackage{listings}
\lstset{
basicstyle=\ttfamily,
numbers=left,
language=TeX,
alsolanguage=[LaTeX]TeX,
escapechar="
}
\begin{document}
In the following minimal file, the line~\ref{begin} begins the document and the
line~\ref{end} ends the document.
\begin{lstlisting}
\documentclass{article}
\begin{document}"\label{begin}"
Foo
\end{document}"\label{end}"
\end{lstlisting}
\end{document}
--8<---------------cut here---------------end--------------->8---

Best regards.

Thanks for your reply.

I may not have been clear enough in the previous post. What I want is
not to add a label to a specific line and then reference it, which seems
to be what your reply was addressing. Instead, I am looking for a
numbering system similar to the one used in the equation environment,
where the equation number is printed to the left or right of the
formula. For my question, I want the first line of this block of code to
print a label on the left side, specifically (%o1).

Thank you again for your reply.

Best wishes,
Jinsong

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 03/03/2025 04:03, Jinsong Zhao wrote:

Hi there,

Hi there,

I am typesetting code using minted or listings package. It works fine.
Now I am hoping to add a label, similar to equation label, on the left
side of the code block, looks like following. (%o1) is the label.

(%o1)  code here here here
       code here here
       code here
       code

However, I can't find a way to do this. Any hint will be appreciated.

I would think the simplest is to put the code listing in a list item, eg

\usepackage{enumitem,listings}
...
\begin{enumerate}[label={(\%ol)}]
\item \begin{lstlisting}
foo
bar
\end{lstlisting}
\end{enumerate}

That way (enumitem) you have good control over the label and the spacing.

Peter

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 2025/3/4 5:45, Peter Flynn wrote:

On 03/03/2025 04:03, Jinsong Zhao wrote:

Hi there,

Hi there,

I am typesetting code using minted or listings package. It works fine.
Now I am hoping to add a label, similar to equation label, on the left
side of the code block, looks like following. (%o1) is the label.

(%o1)  code here here here
        code here here
        code here
        code

However, I can't find a way to do this. Any hint will be appreciated.

I would think the simplest is to put the code listing in a list item, eg

\usepackage{enumitem,listings}
...
\begin{enumerate}[label={(\%ol)}]
\item \begin{lstlisting}
foo
bar
\end{lstlisting}
\end{enumerate}

That way (enumitem) you have good control over the label and the spacing.

Peter

Thank you very much. The code in your reply is exactly what I need. It
is simple and robust (I think).

I'm just getting back to you because my last test (for some reason)
didn't work, but today it did. It's really weird.

Best,
Jinsong

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)