I'm trying to do something along these lines:
\newcommand{\pcite}[2][#2]{( #1 \cite{#2} )}
I.e. make it so that, if an explicit argument is used, then use it, otherwise re-use the second argument as the first
The intended use is:
As \pcite{Author.etal} has stated
should result in
As ( Author.etal [1] ) has stated
whereas
As \pcite[Author and Coauthor, 1999]{Author.etal} have stated
should result in
As ( Author and Coauthor, 1999 [1] ) have stated
PS. This is simply a minimal example, unrelated to the actual command I'm writing.
