Using Lualatex

[quarkQuark]

How would I use this package with Lualatex? It looks like this is supported, because the documentation mentions /robExt/latex/use lualatex. I presume I should add this somehow to the tikz preset. I have tried:

\documentclass{article}
\usepackage{robust-externalize}
\begin{document}
\robExtConfigure{
    add to preset={tikz}{
        use lualatex,
    },
}
\cacheTikz
\begin{tikzpicture}
    \filldraw[black] (0,0) circle (2pt);
\end{tikzpicture}
\end{document}

This compiles properly with latexmk -pdflatex -shell-escape, but not with latexmk -lualatex -shell-escape. Swapping Lualatex for Xelatex also does not work, and nor does importing the shellesc package. I get the following error:

! Undefined control sequence.
<argument> ...CompilationCommand ^^J\pdfmdfivesum
                                                  {\l_robExt_result_str ^^J}...
l.13 \end
         {tikzpicture}

(I also tried replacing every occurrence of pdflatex in robust-externalize.sty with lualatex, which also makes no difference. It even still compiles with pdflatex, which surprises me.)

[tobiasBora]

Could you try to add

\def\pdfmdfivesum#1{%
 \directlua{tex.print(string.upper(md5.sumhexa("\luaescapestring{#1}")))}%
}

Sorry I don't have a computer to test.

[tobiasBora]

On XeLaTeX you want to use \def\pdfmdfivesum{\mdfivesum}, but I need to check if it is enough when accessing a computer.

[quarkQuark]

I'm away at the moment, but I'll have a look Monday or Tuesday.

[tobiasBora]

The bug is solved on master (using basically the fix proposed above), thanks for the report!

[quarkQuark]

Thank you! This now works perfectly (without \usepackage{shellesc}, and I think even without use lualatex)

[tobiasBora]

Great, thanks for the report! Yeah, use lualatex is used if you want to compile the pictures themself using lualatex (so if you do not enable use lualatex, but compile with lualatex it will compile the main document with lualatex, and the cached pictures with pdflatex).