#!/bin/bash
#
# Usage: tex2svg [source.tex]
#
#        Generate an SVG file from a snippet of LaTeX source code.
#        The tex source should not be wrapped in begin/end{document}.
#
# Example Usage:
#
#     $ cat tree.tex
#     \usetikzlibrary{trees}
#     \begin{tikzpicture}
#       \node [circle, draw, fill=red!20] at (0,0) {1}
#       child { node [circle, draw, fill=blue!30] {2}
#         child { node [circle, draw, fill=green!30] {3} }
#         child { node [circle, draw, fill=yellow!30] {4} }};
#     \end{tikzpicture}
#
#     $ ./tex2svg tree.tex
#
#     $ file tree.svg
#     tree.svg: SVG Scalable Vector Graphics image
#
PACKAGES=('[usenames]{color}' '{tikz}' '{color}' '{listings}' '{amsmath}' '{fancyvrb}' '{soul}')

PREAMBLE=$(cat <<EOF
\documentclass[preview]{standalone}
\def\pgfsysdriver{pgfsys-tex4ht.def}
$(for pack in ${PACKAGES[@]};do echo "\\usepackage$pack"; done)
\usepackage{algorithmic}
\usepackage{amsmath}
\usepackage{adjustbox}
\usepackage{fancyvrb}
\usepackage{booktabs}
\usepackage{xcolor}
\usepackage{hyperref}
\usepackage{changepage}
\usepackage{graphicx}
\DeclareGraphicsExtensions{.pdf,.png,.jpg,.JPG}
\begin{document}
EOF
)
POSTAMBLE=$(cat <<EOF
\end{document}
EOF
)

FIG="$1"; shift;
BASE=$(basename $FIG .tex)
TMPFILE="$(mktemp).tex"
TMPBASE=`basename $TMPFILE .tex`
TMPDIR=`dirname $TMPFILE`
cp $@ $TMPDIR

function exit_hook (){ rm -f $TMPBASE* $TMPFILE*; exit 0; }
trap exit_hook EXIT

cat <<EOF > $TMPFILE
$PREAMBLE
$(cat $FIG|sed 's/\\subcaption{.*}//')
$POSTAMBLE
EOF
htlatex $TMPFILE && rm $TMPFILE
if [ -f $TMPBASE-1.svg ];then
    # scour -i $TMPBASE-1.svg -o $BASE.svg \
    #     || cp $TMPBASE-1.svg $BASE.svg
    cp $TMPBASE-1.svg $BASE.svg
    echo $BASE.svg
else
    cp $TMPBASE.html $BASE.html
    echo $BASE.html
fi