\documentclass{article}
\usepackage{luacode}

% Lua kodo vpisemo v loceno datoteko zaradi syntax highlithing
\directlua{dofile('test.lua')}

\newcommand{\stranke}{\luadirect{stranke()}}

\begin{document}
    \begin{tabular}{ll}
        \hline
        id stranke & ime \\
        \hline
        \stranke
        \hline
    \end{tabular}
\end{document}