Testing for TeX boolean in Lua code

Question

How can I test for a TeX boolean in Lua?

This kind of code doesn't work:

\newif\if@mypkg@someif

\begin{luacode}

   -- some lua code

   \if@mypkg@someif
      -- some more lua code
   \else
      -- another lua code
   \fi

   -- again some lua code
\end{luacode}

Is there a way to achieve this?

Answer 1

Tex expansion happens before control is passed to lua. The following minimal example works.

\documentclass{minimal}
\usepackage{luacode}

\newif\ifluaflag

% \luaflagtrue

\begin{luacode}
  print("before flag")
  \ifluaflag
    print("lua flag true")
  \else
    print("lua flag false")
  \fi
\end{luacode}


\begin{document}
test
\end{document}