#!/bin/sh
set -e

# usage: echo "<equation>" | svgtex.sh <output path>

# Copyright 2019-2020 DistressNetwork° <uplink@distress.network>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

tmp=$(mktemp -p /tmp)
eqn=$(cat /dev/stdin)

echo "---- begin assembly: ----"
printf "%s\n" "$eqn"

echo "\\\documentclass[10pt,fleqn]{standalone}
\\\usepackage{standalone,amsmath,amssymb,xcolor}
\\\begin{document}
\\\color[HTML]{DDDDDD}" >> $tmp

printf "\\\[ %s \\\]\n" "$eqn" >> $tmp

echo "\\\end{document}" >> $tmp

# now this is where the fun begins

latex -interaction=batchmode $tmp

[ -f tmp.dvi ] || { echo "---- [FATAL] tex output failed ----" ; exit 1 ; } # make sure output exists before continuing

echo "[ok] tex finished typesetting"

dvisvgm tmp.dvi -f ttf -T S2

echo "[ok] conversion to svg"

mv tmp.svg $1 # final move to desired path

rm tmp.aux tmp.log tmp.dvi $tmp # cleanup

echo "---- build complete: $1 ----"