Added dvi support with use latex and dvi and dvi to ps

doc/figures/demo.tikz

@@ -0,0 +1,11 @@
+\begin{tikzpicture}
+	\begin{pgfonlayer}{nodelayer}
+		\node [style=Z dot] (0) at (0, 0) {};
+		\node [style=X dot] (1) at (1, 0) {};
+	\end{pgfonlayer}
+	\begin{pgfonlayer}{edgelayer}
+		\draw [bend left=60] (0) to (1);
+		\draw [bend right=60] (0) to (1);
+		\draw (0) to (1);
+	\end{pgfonlayer}
+\end{tikzpicture}

doc/robust-externalize.tex

@@ -105,7 +105,7 @@
   {\Large\bfseries Cache anything (\tikzname, tikz-cd, python…),\\in a robust, efficient and pure way.}
 
   \vspace{1em}
-  {Léo Colisson \quad Version 2.9}\\[3mm]
+  {Léo Colisson \quad Version 2.9+unstable}\\[3mm]
   {\href{https://github.com/leo-colisson/robust-externalize}{\texttt{github.com/leo-colisson/robust-externalize}}}
 \end{center}
 
@@ -3859,10 +3859,24 @@ \subsubsection{\LaTeX{} and \tikzname{}}
   \extractkey/robExt/latex/use latexmk\@nil
   \extractkey/robExt/latex/use lualatex\@nil
   \extractkey/robExt/latex/use xelatex\@nil
+  \extractkey/robExt/latex/use latex and dvi\@nil
+  \extractkey/robExt/dvi to ps\@nil
   \makeatother%
   \pgfmanualbody
-  Use latexmk/lualatex/xelatex to compile. It is a shortcut for:\\
-  |set placeholder={__ROBEXT_LATEX_ENGINE__}{yourfavoriteengine}|
+  The first three styles use latexmk/lualatex/xelatex to compile. It is a shortcut for:\\
+  |set placeholder={__ROBEXT_LATEX_ENGINE__}{yourfavoriteengine}|\\
+  |dvi to ps| is called internally in |use latex and dvi|, converts the |.dvi| file into a |.ps| file, and renames it into |.pdf| so that it is automatically included. |use latex and dvi| sets the compiler to |latex|, producing |dvi| files, and call |dvi to ps| to convert them to ps files that can be included. So if your workflow involves dvi, you can call directly:
+  \begin{codeexample}[code only]
+    \robExtConfigure{
+      add to preset={latex}{use latex and dvi},
+    }
+  \end{codeexample}
+  and you can then compile your file as usual with:
+\begin{verbatim}
+# --shell-escape only needed the first time you compile, see above for alternatives
+$ latex --shell-escape yourfile.tex
+$ dvips yourfile.dvi
+\end{verbatim}
 \end{pgfmanualentry}
 
 \begin{pgfmanualentry}
@@ -4932,6 +4946,10 @@ \section{TODO and known bugs:}
 \section{Changelog}
 
 \begin{itemize}
+\item v2.10 (not yet released, github master branch):
+  \begin{itemize}
+  \item Added |dvi to ps| and |use latex and dvi|
+  \end{itemize}
 \item v2.9 (2024/03/15)
   \begin{itemize}
   \item Bug that may forbid the package to load has been fixed (you might encounter |ERROR: Missing = inserted for \ifnum|)

doc/tikzit.sty

@@ -0,0 +1,42 @@
+\usepackage{tikz}
+\usetikzlibrary{backgrounds}
+\usetikzlibrary{arrows}
+\usetikzlibrary{shapes,shapes.geometric,shapes.misc}
+
+% this style is applied by default to any tikzpicture included via \tikzfig
+\tikzstyle{tikzfig}=[baseline=-0.25em,scale=0.5]
+
+% these are dummy properties used by TikZiT, but ignored by LaTex
+\pgfkeys{/tikz/tikzit fill/.initial=0}
+\pgfkeys{/tikz/tikzit draw/.initial=0}
+\pgfkeys{/tikz/tikzit shape/.initial=0}
+\pgfkeys{/tikz/tikzit category/.initial=0}
+
+% standard layers used in .tikz files
+\pgfdeclarelayer{edgelayer}
+\pgfdeclarelayer{nodelayer}
+\pgfsetlayers{background,edgelayer,nodelayer,main}
+
+% style for blank nodes
+\tikzstyle{none}=[inner sep=0mm]
+
+% include a .tikz file
+\newcommand{\tikzfig}[1]{%
+{\tikzstyle{every picture}=[tikzfig]
+\IfFileExists{#1.tikz}
+  {\input{#1.tikz}}
+  {%
+    \IfFileExists{./figures/#1.tikz}
+      {\input{./figures/#1.tikz}}
+      {\tikz[baseline=-0.5em]{\node[draw=red,font=\color{red},fill=red!10!white] {\textit{#1}};}}%
+  }}%
+}
+
+% the same as \tikzfig, but in a {center} environment
+\newcommand{\ctikzfig}[1]{%
+\begin{center}\rm
+  \tikzfig{#1}
+\end{center}}
+
+% fix strange self-loops, which are PGF/TikZ default
+\tikzstyle{every loop}=[]