How can I write a macro to convert a list into a table?

Question

I think this is an easy for-loop question, but I can't seem to get it to work...

I frequently need to put a CC list at the end of the documents that I prepare. I have been making the list manually, doing something like

\noindent
\begin{tabular}{l l}
CC: & Dr. A. Name \\
    & Mr. B. Name \\
    & Dr. C. Name 
\end{tabular}

How would I make a macro that accepts that list of names as an argument and outputs the tabular? I would like to declare a variable in my document

\cc{Dr. A Name, Mr. B Name, Dr. C Name}

then at the end of the doc do something like

\makecclist

which puts in the formatted cc list table at the end.

Thanks for any help!

Answer 1

It's a breeze with expl3: we just need to deliver the list with \\ & between the items.

\documentclass{article}
%\usepackage{xparse} % uncomment if using LaTeX release prior to 2020-10-01
\ExplSyntaxOn
% declare a variable
\clist_new:N \g_userx_cc_names_clist
% populate the variable
\NewDocumentCommand{\cc}{m}
 {
  \clist_gset:Nn \g_userx_cc_names_clist { #1 }
 }
% use the variable
\NewDocumentCommand{\makecclist}{}
 {
  \clist_if_empty:NF \g_userx_cc_names_clist
   {
    \begin{tabular}{ @{} l l @{} }
    CC: & \clist_use:Nn \g_userx_cc_names_clist { \ & }
    \end{tabular}
   }
 }
\ExplSyntaxOff
\begin{document}
\cc{Dr. A Name, Mr. B Name, Dr. C Name}
\makecclist
\end{document}