#! /bin/bash
# this function takes a string in version format (s.a 2.6.16) and makes it an integer (00020006001600000000)
function digit_version { echo $1 | awk -F. '{ printf("%04d%04d%04d\n", $1, $2, $3); }'; }

# This script will work on tools that have the --version option and print the version number in the first line.
# It has three arguments:
# 1) Path to the tool
# 2) An operator (eq/ne/ge/gt/le/lt) 
# 3) A version number 
#
# Example usage:
# To test whether gcc version is == 4.3, run the following command:
# testToolVersion /usr/bin/gcc eq 4.3

# If the application is not found, echo 0 and exit
if [ ! -f $1 ]; then echo 0; exit; fi

ver1=$(digit_version "`$1 --version | egrep -o "[1-9]*{1}\.[1-9]*{1}(\.[0-9]*)?" | head -1`")
ver2=$(digit_version $3)
case $2 in
    "eq" )  if [ $ver1 -eq $ver2 ]; then echo 1; else echo 0; fi ;;
    "ne" )  if [ $ver1 -ne $ver2 ]; then echo 1; else echo 0; fi ;;
    "lt" )  if [ $ver1 -lt $ver2 ]; then echo 1; else echo 0; fi ;;
    "le" )  if [ $ver1 -le $ver2 ]; then echo 1; else echo 0; fi ;;
    "gt" )  if [ $ver1 -gt $ver2 ]; then echo 1; else echo 0; fi ;;
    "ge" )  if [ $ver1 -ge $ver2 ]; then echo 1; else echo 0; fi ;;
    * )     echo "Bad argument $1 (should be eq/ne/ge/gt/le/lt) " ;;
esac