code-link

code-link links the code in your listings to the place where it is defined or documented. It works with xlistings, with listings, and with minted, and it needs none of them in particular. It is the companion of xlistings, a separate package. Its manual is code-link-doc. The benchmark of its cost is in bench/ of the repository.

\usepackage{listings}
\usepackage{hyperref}
\usepackage[underline]{code-link}

\CodeLinkAnchor[command]{mymacro}  % target + registration
\begin{lstlisting}
\mymacro{x}                        % becomes a link from the second run on
\end{lstlisting}

Originally, the functionality was tightly intertwined and written by Florian Sihler for the tikzpingus documentation, the extraction was assisted by Claude. l3build check runs the tests, the tests of the minted backend need -shell-escape and Pygments.