#! /bin/bash


# This script gets two arguments:
# 1) An operand (eq/ne/ge/gt/le/lt) 
# 2) A version number 
# and returns the result of the comparison against macOS version (sw_vers).
#
# Example usage:
# To test whether the macOS version is == 10.11.4 , run the following command:
# testLinuxDistVersion eq 10.11.4

dist_ver="`sw_vers | grep ProductVersion | cut -d ':' -f 2 | head -1`" 
#echo $dist_ver

# 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); }'; }

script_dir=`dirname $0`
dist_ver=$(digit_version $dist_ver)
#echo $dist_ver

arg_ver=$(digit_version $2)
#echo $arg_ver

case $1 in
    "eq" )  if [ $dist_ver -eq $arg_ver ]; then echo 1; else echo 0; fi;;
    "ne" )  if [ $dist_ver -ne $arg_ver ]; then echo 1; else echo 0; fi;;
    "lt" )  if [ $dist_ver -lt $arg_ver ]; then echo 1; else echo 0; fi;;
    "le" )  if [ $dist_ver -le $arg_ver ]; then echo 1; else echo 0; fi;;
    "gt" )  if [ $dist_ver -gt $arg_ver ]; then echo 1; else echo 0; fi;;
    "ge" )  if [ $dist_ver -ge $arg_ver ]; then echo 1; else echo 0; fi;;
    "" | "-help" | "--help") echo "
    # This script gets two arguments:
    # 1) An operand (eq/ne/ge/gt/le/lt) 
    # 2) A version number 
    # and returns the result of the comparison against macOS version (sw_vers).
    #
    # Example usage:
    # To test whether the macOS version is == 10.11.4 , run the following command:
    # testLinuxDistVersion eq 10.11.4
    " ;;
    * )     echo "Bad argument $1 (should be eq/ne/ge/gt/le/lt), do --help for more information " ;;
esac