#!/bin/bash

# usage: _grep_pkginfo pkgfile pattern
_grep_pkginfo() {
	local _ret

	_ret="$(/usr/bin/bsdtar -xOqf "$1" .PKGINFO | /bin/grep -m 1 -E "$2" | /bin/sed 's|\w*\s*=\s*\(.*\)|\1|')"
	echo "$_ret"
}

# Get the package name
getpkgname() {
	local _name

	_name="$(_grep_pkginfo "$1" "^pkgname")"
	if [ -z "$_name" ]; then
		echo "ERROR: Package '$1' has no pkgname in the PKGINFO. Fail!" >&2
		exit 1
	fi

	echo "$_name"
}

# Get the package base or name as fallback
getpkgbase() {
	local _base

	_base="$(_grep_pkginfo "$1" "^pkgbase")"
	if [ -z "$_base" ]; then
		getpkgname "$1"
		return 0
	fi

	echo "$_base"
}


if [ $# -ne 1 ]; then
	echo "usage: $(basename $0) <pkgfile>"
	exit 1
fi

getpkgbase "${1}"