Stepslist: "Step k of n"

Question

I am trying to come up with a new enumerated list environment "stepslist" such that the items are marked with "Step k of n", where n is the total number of items in one stepslist environment, and k is the kth item in it. Thus e.g. the code

\begin{stepslist}
\item A
\item B
\item C
\end{stepslist}

ought to render as:

Step 1 of 3: A

Step 2 of 3: B

Step 3 of 3: C

and

\begin{stepslist}
\item A
\item B
\item C
\item D
\end{stepslist}

ought to render as:

Step 1 of 4: A

Step 2 of 4: B

Step 3 of 4: C

Step 4 of 4: D

I don't want to define the variable n myself; I want its value to be determined automatically by the macro. Conversations with GPT4 suggest a "two-pass approach" (which makes sense, since as I understand it LaTeX does not know at the beginning of a list environment how many items there are in it).

I am unaware if this can even be done, but if it can then I would appreciate a method that would work in Overleaf.

Answer 1

You can set a label which counts the items:

\documentclass{article}
\usepackage{enumitem} % 
\newlist{stepslist}{enumerate}{1}
\setlist[stepslist,1]{label={Step \arabic* of \ref{steplist:\themylistcnt}:},ref=\arabic{stepslisti}}
\newcounter{mylistcnt} % for a unique label
\AddToHook{env/stepslist/begin}{\stepcounter{mylistcnt}}
\AddToHook{env/stepslist/end}{\label{steplist:\themylistcnt}}
\begin{document}
\begin{stepslist}
\item A
\item B
\item C
\item D
\end{stepslist}
\begin{stepslist}
\item A
\item B
\item C
\end{stepslist}
\end{document}