Recompile a LaTeX image if neccessary

If Rerun to get is present in a .log file left over form a LaTeX compile, then the file needs to be recompiled to reach its final state. This can happen, e.g., for tikz images where it has saved position information to the .aux file.

This commit adds a check of the log file to see if an image needs recompilation and recompiles if necessary.

Fixes #2140

This code can be tested by running ./pretext/pretext -c latex-image -f svg -v [file location] on the example:

<pretext>

    <docinfo>
        <macros>
        \newcommand{\doubler}[1]{2#1}
        </macros>
        <latex-image-preamble>
            \usepackage[dvipsnames]{xcolor}
            \usepackage{tikz}
            \usepackage{nicematrix}
        </latex-image-preamble>
    </docinfo>

    <article xml:id="minimal">
        <title>A Minimal Article</title>

        <section xml:id="section-textual">
            <title>Just Some Text</title>

            <image width="50%">
                <latex-image>
                    \begin{tikzpicture}
                    \node{
                        $\begin{bNiceArray}{ccc|cc}[
                        code-before={\cellcolor{LimeGreen!72}{1-1,2-2,3-3}\cellcolor{NavyBlue!72}{1-2,2-3,3-4}\cellcolor{CornflowerBlue!72}{1-3,2-4,3-5}}
                        ]
                        3 \amp 4 \amp 0 \amp 1 \amp 4 \\
                        -2 \amp 3 \amp 1 \amp -2 \amp 3 \\
                        0 \amp 2 \amp 1 \amp 0 \amp 2
                        \end{bNiceArray}$
                    };
                \end{tikzpicture}
                </latex-image>
            </image>
        </section>

    </article>

</pretext>

If compiled correctly, you should see colored boxes along the diagonal of the matrix.

PreTeXtBook / pretext

Recompile a LaTeX image if neccessary #2142