#!/bin/bash
# eq2eps - by Vitaly N. Golovach, May 5, 2006
# I did not intend to make it short ;-)
##################################################
argN=3
userpacksdef="amsfonts,bm,amstext,amssymb"
if [ $# -gt $argN ] 
then
       echo "Too many arguments: $# instead of maximum of ${argN}."
       exit 1
fi       
if [ -z "$1" -o "$1" = "--help" -o "$1" = "-help" ]
then
	echo "Usage: eq2eps 'equation' filename.eps [usepackages]"
	echo "Description:	Converts a LaTeX equation to an EPS file with a tight bounding box."
	echo "		The equation should be taken in single quotes, unless it consists of a single word."
	echo "		Example: eq2eps 'y = f(x)' yfx.eps"
	echo "		Note that the eqnarray environment is used, which means that multiple-line equations are allowed."
	echo "		Example: eq2eps 'x&=&f_x(t) \\\\ x&=&f_y(t) \nonumber\\\\ z&=&f_z(t)' zeroes.eps"
	echo "		The \\nonumber option is inserted automatically to the first and last lines."
	echo "		Some usepackages are already present here: $userpacksdef "
	echo "		Additional usepackages, separated by comma, can be included as third argument." 
	echo "		Example: eq2eps 'y=f(\bm{r})' yfr.eps bm,amssymb,amstext" 
	exit 0
fi
if [ -z "$2" ]
then
	echo "Please specify the output file name, for example: eq2eps 'i^2=-1' i2.eps"
	exit 1
fi
if [ -z "$3" ]
then
	addonsty=""
else
	addonsty=",$3"
fi
echo "\tolerance=20000" > filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex
echo "\documentclass[12pt]{report}" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
echo "\usepackage{${userpacksdef}${addonsty}}" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex
echo "\pagestyle{empty}" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
echo "\begin{document}" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
echo "\begin{eqnarray}" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
echo "\nonumber" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex
echo $1 >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
echo "\nonumber" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
echo "\end{eqnarray}" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
echo "\end{document}" >> filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex 
latex -interaction=nonstopmode filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex | grep "no such output is expected here" 
if [ -f filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.dvi ]
then
	nothingtodo=""
else
	echo "LaTeX translation error. Check the arguments and try again."
	exit 1
fi
dvips -q -E filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.dvi -o $2 
if [ -f filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex ]
then
	rm filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.tex
fi
if [ -f filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.dvi ]
then
	rm filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.dvi
fi
if [ -f filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.log ]
then
	rm filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.log
fi
if [ -f filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.aux ]
then
	rm filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.aux
fi
if [ -f filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.ps ]
then
        rm filetmptexnosuchnamepleasebutifsothenitisriskytooverwriteit.ps
fi