credit.tex

\documentclass{article}

\usepackage{pgffor}
\usepackage{pgfkeys}
\usepackage{ifthen}

\pgfkeys{
	/contributions/.cd,
	1/.initial=Conceptualization,
	2/.initial=Methodology,
	3/.initial=Software,
	4/.initial=Validation,
	5/.initial=Formal Analysis,
	6/.initial=Investigation,
	7/.initial=Resources,
	8/.initial=Data Curation,
	9/.initial=Writing---original draft,
	10/.initial=Writing---review \& editing,
	11/.initial=Visualization,
	12/.initial=Supervision,
	13/.initial=Project administration,
	14/.initial=Funding acquisition,
}

\def\printcontributionstatement{}

\newcommand{\contribution}[2]{%
	\def\contributor{#1}%
	\def\indices{#2}%
	\def\contributions{}%
	\foreach \index in \indices {%
		\pgfmathparse{int(\index)}%
		\ifthenelse{\pgfmathresult > 0 \AND \pgfmathresult < 15}{
			\ifx\contributions\empty
			\xdef\contributions{\pgfkeysvalueof{/contributions/\pgfmathresult}}%
			\else
			\xdef\contributions{\contributions, \pgfkeysvalueof{/contributions/\pgfmathresult}}%
			\fi
		}{
			\PackageError{Contribution Statement Generator}{Contributor \contributor has an illegal contribution index (\pgfmathresult). Use indices 1-14 representing the CRediT roles}
		}
	}%
	\ifx\printcontributionstatement\empty
		\xdef\printcontributionstatement{\contributor{} (\contributions)}%
	\else
    		\xdef\printcontributionstatement{\printcontributionstatement, \contributor{}  (\contributions)}%
  	\fi
	% \ifx\printcontributionstatement\empty
	% 	\xdef\printcontributionstatement{\noexpand\contributor (\contributions)}%
	% \else
	% 	\xdef\printcontributionstatement{\unexpanded\expandafter{\printcontributionstatement}. \noexpand\contributor (\contributions)}%
	% \fi
}


\begin{document}
\contribution{Michael Dorner}{1, 2, 4, 6}
\contribution{Andreas Bauer}{14}
%\contribution{Prof. R}{15}
\printcontributionstatement{}
\end{document}