graphviz.sty

% graphviz.sty
% by Mark Aufflick
% 2006-03-25
% mark@aufflick.com
% http://mark.aufflick.com/
%
% based on graphviz.tex by Derek Rayside 2003

% Modified by Mike Prentice (mjp44@buffalo.edu)
% 2011-02-21
% To use PDF output directly from dot
% dot -Tpdf

% Modified by Remi Dubot (remi.dubot@irit.fr)
% 2012-12-3
% To distinguish errors from tex and from dot. 
% Report dot errors
% Indications for non english writers

% add the following lines to your preamble:

% \usepackage[pdftex]{graphicx}
% \usepackage{graphviz}

% parameters to \digraph:
% 1 - parameters for \includegraphics (optional; default value is "scale=1")
% 2 - name of the digraph
% 3 - body of the digraph

% parameters to \includedot
% 1 - parameters for \includegraphics (optional; default value is "scale=1")
% 2 - name of the dot file (w/out file extension, which must be `.dot')

% ASSUMES pdflatex 
% If you are not using pdflatex, go back on an older version of this style. 

% If you are not writing english, pay attention to your charset. 
% If is not UTF-8, you may have to indicate your charset to dot with "-Gccharset=XXXX".  

\ProvidesPackage{graphviz}

\newcommand{\includedot}[2][scale=1]{%
  \ifnum\pdfshellescape=1
  % Yes, enabled
    \immediate\write18{bash -c "dot -Tpdf #2.dot -o #2.pdf 2> #2.log"}%
    \IfFileExists{#2.pdf}
    % the pdf exists: include it
    {\includegraphics[#1]{#2}}
    % the pdf was not created - show a hint
    { \fbox{ \begin{tabular}{l}
          The file \texttt{#2.pdf} hasn't been created from
          \texttt{#2.dot} yet. \\
          We attempted to create it with:\\
          `\texttt{dot -Tpdf #2.dot -o #2.pdf}' \\
          but that seems not to have worked.\\
          \texttt{dot} said : \\
          "\texttt{\input{#2.log}}"
        \end{tabular}}
    }
  \else
    \fbox{ \begin{tabular}{l}
            You need to execute `\texttt{pdflatex}' with the `\texttt{-shell-escape}' option.\\
            This allows the graphviz package to execute the program dot. 
          \end{tabular}}
  \fi
}

\newcommand{\digraph}[3][scale=1]{ 
  \newwrite\dotfile 
  \immediate\openout\dotfile=#2.dot 
  \immediate\write\dotfile{digraph #2 {\string#3}} 
  \immediate\closeout\dotfile
  \includedot[#1]{#2}
}