#!/bin/bash
# Copyright (C) 2004  Otávio Corrêa Cordeiro
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# Otávio Corrêa Cordeiro
# otaviocc@turing.unisinos.br

ConverTeX_latex=latex
ConverTeX_dvips=dvips
ConverTeX_convert=convert
ConverTeX_density=320
ConverTeX_class=article
ConverTeX_version="1.1"

function IsOK () {
	if [ "$?" = "0" ]
	then
		echo -e "Status: \033[0;31mOK\033[0m"
	else
		echo -e "Status: \033[0;31mFail\033[0m"
		echo -e "Status: \033[0;31mAborting ...\033[0m"
		rm -f tmpConverTex*
		exit;
	fi
}

function getHelp () {
	echo "Use: ConverTeX [OPTIONS]..."
	echo ""
	echo "OPTIONS:"
	echo "    --equation, -e 'equation' (w. single quotes)    Convert"
	echo "    --version,  -v                                  Version"
	echo "    --help,     -h                                  This Help"
}

function Parser_ConverTeX () {
	Parser_ConverTeX_str=`echo -E $* | \
	sed 's/\\\\f/\\\\\\\\\\\\\\\\\\\\\\\\f/g' | \
	sed 's/\\\\v/\\\\\\\\\\\\\\\\\\\\\\\\v/g' | \
	sed 's/\\\\e/\\\\\\\\\\\\\\\\\\\\\\\\e/g' | \
	sed 's/\\\\r/\\\\\\\\\\\\\\\\\\\\\\\\r/g' | \
	sed 's/\\\\c/\\\\\\\\\\\\\\\\\\\\\\\\c/g' | \
	sed 's/\\\\t/\\\\\\\\\\\\\\\\\\\\\\\\t/g' | \
	sed 's/\\\\n/\\\\\\\\\\\\\\\\\\\\\\\\n/g' | \
	sed 's/\\\\b/\\\\\\\\\\\\\\\\\\\\\\\\b/g'`
}

function criaArquivo_ConverTeX () {
	ConverTeX_corpotex="\\documentclass{$ConverTeX_class}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\usepackage{amsmath}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\usepackage{amsfonts}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\usepackage{amssymb}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\usepackage{cancel}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\pagestyle{empty}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\begin{document}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\begin{displaymath}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"$*\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\end{displaymath}\n"
	ConverTeX_corpotex=$ConverTeX_corpotex"\\\end{document}\n"
}

function criaImagem_ConverTeX (){
	Parser_ConverTeX $*
	criaArquivo_ConverTeX $Parser_ConverTeX_str

	echo -e "Creating TeX / Criando estrutura TeX..."
	echo -e $ConverTeX_corpotex > tmpConverTex.tex
	$ConverTeX_latex --interaction=nonstopmode tmpConverTex.tex > /dev/null
	IsOK
	echo -e "Compiling / Compilando..."
	$ConverTeX_dvips tmpConverTex.dvi -o tmpConverTex.ps 2>&-
	IsOK
	echo -e "Converting / Convertendo..."
	$ConverTeX_convert -density $ConverTeX_density -trim -transparent "#FFFFFF" tmpConverTex.ps tmpConverTeX.png
	IsOK

	set $(date +%j%H%M%S)
	mv tmpConverTeX.png equation$1.png
	rm -f tmpConverTex*

	echo -e "Done / Feito! (equation$1.png)"
}

until [ -z "$1" ]; do
	case $1 in
		--equation|-e )
			shift
			criaImagem_ConverTeX $*
		;;
		--help|-h )
			getHelp
			exit 0
		;;
		--version|-v )
			echo -e "ConverTeX v.$ConverTeX_version"
			echo -e "by Otavio Correa Cordeiro"
			exit 0
		;;
		-*)
			echo "Unrecognized option $1"
			exit 1
		;;
	esac
	shift
	if [ "$#" = "0" ]; then
		break
	fi
done
#################################################################