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From: Peter Flynn <peter@silmaril.ie>
Newsgroups: comp.text.tex
Subject: Re: label on the left side of minted or listings
Date: Mon, 3 Mar 2025 21:45:32 +0000
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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