Show graphical manipulation commands in moodle.sty

moodleshow.tex

% 
\makeatletter
\renewcommand\moodle@includegraphics@int@int[2][]{%
  \bgroup% The grouping is to localize the changes caused by \setkeys.
    \message{moodle.sty: Processing \string\includegraphics[#1]{#2} for HTML...^^J}
    \setkeys*{moodle@includegraphics}{#1}%
    % Height or width should be given in TeX dimensions like cm or pt or in,
    % and are converted to pixels for web use using the ppi key.
    % TO DO: Can we modify \includegraphics to accept height or width in
    %        pixels?
    % TO DO: What about \includegraphics[scale=0.7] ?
    %        Other keys: keepaspectratio=true|false, angle (rotation), clip & trim
    \ifnum\moodle@graphics@height@pixels=0\relax
      \ifnum\moodle@graphics@width@pixels=0\relax
        % No size specified.  Default to height of 200 pixels.
        \def\moodle@graphics@geometry{x200}%
        \def\moodle@graphics@htmlgeometry{}%
      \else
        % Width only specified.
        \edef\moodle@graphics@geometry{\number\moodle@graphics@width@pixels}%
        \edef\moodle@graphics@htmlgeometry{width=\number\moodle@graphics@width@pixels}%
      \fi
    \else
      \ifnum\moodle@graphics@width@pixels=0\relax
        % Height only specified.  The `x' is part of the syntax.
        \edef\moodle@graphics@geometry{x\number\moodle@graphics@height@pixels}%
        \edef\moodle@graphics@htmlgeometry{height=\number\moodle@graphics@height@pixels}%
      \else
        % Height and width both specified.  The `!' is part of the syntax.
        \edef\moodle@graphics@geometry{\number\moodle@graphics@width@pixels x\number\moodle@graphics@height@pixels!}%
        \edef\moodle@graphics@htmlgeometry{width=\number\moodle@graphics@width@pixels\otherspace height=\number\moodle@graphics@height@pixels}%
      \fi
    \fi
    %First, convert it to PNG
    \edef\cmdline{\htmlize@imagemagick@convert\otherspace #2 -resize \moodle@graphics@geometry\otherspace #2.png}%
    \message{moodle.sty:   Converting '#2' to PNG...^^J}%
    \message{command is: \cmdline ^^J}
    \expandafter\immediate\expandafter\write18\expandafter{\cmdline}%
    %Next, convert the PNG to base64 encoding
    \def\cmdline{\openssl\otherspace enc -base64 -in #2.png -out #2.enc}%
    \message{command is: \cmdline ^^J}
    \expandafter\immediate\expandafter\write18\expandafter{\cmdline}%
    \message{command is: \cmdline}
    %Now, save that base64 encoding in a TeX macro
    \def\moodle@newpic@baselxiv{}%
    \message{moodle.sty:   Reading base64 file '#2.enc'...^^J}%
    \openin\baseLXIVdatafile=#2.enc\relax
      \savebaselxivdata@recursive
    \closein\baseLXIVdatafile
    \xa\global\xa\let\csname picbaselxiv@graphics@#2\endcsname=\moodle@newpic@baselxiv%
    \edef\htmlize@imagetag{<IMG \moodle@graphics@htmlgeometry\otherspace SRC="data:image/png;base64,\csname picbaselxiv@graphics@#2\endcsname">}%
    \xa\g@addto@macro\xa\htmlize@output\xa{\htmlize@imagetag}%
    \message{moodle.sty:   <IMG> tag inserted.^^J}%
  \egroup
  % Now we re-insert the code to get the HTMLizing going again.
  \xa\htmlize@proceedwiththerest\htmlize@afteraction@hook
}


\makeatother
\endinput