ref should use enumerate label name

Question

I have done this:

begin{enumerate}
renewcommand{labelenumi}{textbf{S.theenumi}}
item a
item label{l} b
item c. goto ref{l}
end{enumerate}

The ref just uses the enumerate number. But I want it to be the full enumerate label.

I also could just type S.ref{l} but that has the two disadvantages that

if I update the enumerate label, I also have to update this reference,
together with hyperref, this doesn't look so nice.

How would be a clean/nice way to solve this?

Gonzalo Medina · Accepted Answer

You can use the enumitem package:

documentclass{article}
usepackage{enumitem}

begin{document}

begin{enumerate}[label=textbf{S.arabic*}]
item a
item label{l} b
item c. goto ref{l}
end{enumerate}

end{document}

or

begin{enumerate}[label=textbf{S.arabic*},ref=S.arabic*]
item a
item label{l} b
item c. goto ref{l}
end{enumerate}

if you don't want the reference to be boldfaced.

Werner · Answer

For your attempt properly work, you need redefine the counter representation (theenumi) as well as the label associated with it (labelenumi). This separates the formatting from the counter when you're using ref:

documentclass{article}
begin{document}
begin{enumerate}
renewcommand{labelenumi}{textbf{theenumi}}
renewcommand{theenumi}{S.arabic{enumi}}
item a
makeatletter
show@currentlabel
makeatother
item label{l} b
item c. goto ref{l}
end{enumerate}
end{document}

This also works nicely with hyperref. However, in general, it is much easier to use enumitem since it can be used in a global or localized setting using a key-value approach; very convenient.

Bramau · Answer

With packages paralist works as well
documentclass{article}
begin{document}
usepackage{paralist}
begin{enumerate}[bfseries{S}.1]
item a
makeatletter
show@currentlabel
makeatother
item label{l} b
item c. goto ref{l}
end{enumerate}
end{document}

Donald Arseneau · Answer

For all counters in LaTeX (not needing packages) there is a macro p@counter used as a prefix in label/ref for that counter. So the matching set of definitions would be
makeatletter
renewcommand{labelenumi}{textbf{theenumi}}
renewcommand{theenumi}{S.arabic{enumi}}
renewcommand{p@enumi}{S.}
makeatother

The more natural way of doing it would be to leave theenumi as just the counter value, and put all adornment in the others
makeatletter
renewcommand{labelenumi}{textbf{S.theenumi}}
renewcommand{theenumi}{arabic{enumi}}
renewcommand{p@enumi}{S.}
makeatother

ref should use enumerate label name

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