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\documentclass[notitlepage,12pt]{article}
\usepackage{luacode}
\newcommand{\somecommand}{
\loop
\begingroup%
\directlua{loopcnt=loopcnt+1}%
\ifnum\somecount=1%
\directlua{prevcount=prevcount+\luastring{\pgfmathresult}}%
\else%
\directlua{prevcount=prevcount+\luastring{\someamt}}%
\fi%
\endgroup%
\if\someothercnt0%
\repeat%
\directlua{linecount=math.floor(prevcount)+1;}%
\fi
}
\begin{document}
\directlua{
local foo = "this is lua syntax highlighting";
function helloworld(input)
local output = input + \luastring{\something} + "123";
return output
end
prevcount prevcount + \luastring{\something} + "123";
}
\end{document}
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