version.functions

# This file is part of shellfire version. It is subject to the licence terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/shellfire-dev/version/master/COPYRIGHT. No part of shellfire version, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
# Copyright © 2014-2015 The developers of shellfire version. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/shellfire-dev/version/master/COPYRIGHT.


version_isLessThan()
{
	_version_is eq 0 "$@"
}

version_isEqualTo()
{
	_version_is eq 1 "$@"
}

version_isGreaterThan()
{
	_version_is eq 2 "$@"
}

version_isLessThanOrEqualTo()
{
	_version_is le 1 "$@"
}

version_isGreaterThanOrEqualTo()
{
	_version_is ge 1 "$@"
}

_version_is()
{
	local operator=$1
	local expectedCode=$2
	shift 2
	
	set +e
	version_compare "$@"
	local exitCode=$?
	set -e
	if [ $exitCode -$operator $expectedCode ]; then
		return 0
	fi
	return 1
}

# 0 is less than
# 1 is equal to
# 2 is greater than
version_compare()
{
	local leftVersion="$1"
	local rightVersion="$2"
	
	if [ "$leftVersion" = "$rightVersion" ]; then
		return 1
	fi
	
	local leastVersion
	read -r leastVersion <<-EOF
		$(_version_compare_sort)
	EOF
	
	if [ "$leastVersion" = "$leftVersion" ]; then
		return 0
	fi
	return 2
}

_version_compare_sort()
{
	sort -n -t '.' -k 1,1n -k 2,2n -k 3,4n -k 4,4n -k 5,5n -k 6,6n -k 7,7n <<-EOF
		${leftVersion}
		${rightVersion}
	EOF
}