export _unpack_supported=".tar$|.tgz$|.txz$|.tar.gz$|.tar.xz$|.zip$|.iso$|.rar$"

# Pack files into desired format.
# All files and directories by default.
# Usage: pack <TARGET.ext> [FILES]
function pack() {
	local IFS=$'\n'
	local output="${1}"
	local targets=("${@:2}")
	local format="${output##*.}"
	local name="${output%.*}"

	# report no output.
	if [[ "${output}" = "" ]]; then
		help pack
		return 2
	fi

	# report no format.
	if [[ "${format}" = "" ]]; then
		_error "Could not determine output format."
		help pack
		return 2
	fi

	# All targets by default.
	[[ "${targets}" = "" ]] && targets=(*)

	case "${format}" in
		"tgz")
			_pack_tgz "${output}" "${targets[@]}"
			;;
		"txz")
			_pack_txz "${output}" "${targets[@]}"
			;;
		"tar")
			_pack_tar "${output}" "${targets[@]}"
			;;
		"zip")
			_pack_zip "${output}" "${targets[@]}"
			;;
		"gz")
			_pack_gz "${output}" "${targets[@]}"
			;;
		"xz")
			_pack_xz "${output}" "${targets[@]}"
			;;
		*)
			_error "${target}: Format not supported."
			return 2
			;;
	esac
}

# Attempt to unpack.
# All supported formats by default.
# Usage: unpack [FILES]
function unpack() {
	local IFS=$'\n'
	local targets=(${@})
	[[ "${targets}" = "" ]] && targets=($(_ls_files | grep -E ${_unpack_supported}))

	process() {
		# unpack file type.
		local type="${target##*.}"

		[[ "${target}" =~ .tar.gz$ ]] && type="tar.gz"
		[[ "${target}" =~ .tar.xz$ ]] && type="tar.xz"

		# unpack content.
		case "${type,,}" in
			"zip")
				_unpack_zip "${target}"
				;;
			"7z")
				_unpack_7z "${target}"
				;;
			"tgz"|"tar.gz")
				_unpack_tgz "${target}"
				;;
			"txz"|"tar.xz")
				_unpack_txz "${target}"
				;;
			"tar")
				_unpack_tar "${target}"
				;;
			"iso")
				_unpack_iso "${target}"
				;;
			"rar")
				_unpack_rar "${target}"
				;;
			"xz")
				_unpack_xz "${target}"
				;;
			"gz")
				_unpack_gz "${target}"
				;;
			*)
				_error "${target}: Format not supported."
				return 2
				;;
		esac
	}

	_iterate_targets process ${targets[@]}
}

function _pack_zip() {
	zip -9 -r "${@}"
}

function _pack_tgz() {
	tar -c "${@:2}" | pv -s $(/usr/bin/env du -csb "${@:2}" | sed -n -e '$p' | awk '{print $1}') | gzip -1 > "${1}"
}

function _pack_txz() {
	tar -c "${@:2}" | pv -s $(/usr/bin/env du -csb "${@:2}" | sed -n -e '$p' | awk '{print $1}') | xz -9e > "${1}"
}

function _pack_tar() {
	tar -c "${@:2}" | pv -s $(/usr/bin/env du -csb "${@:2}" | sed -n -e '$p' | awk '{print $1}') > "${1}"
}

function _pack_gz() {
	pv "${2}" | gzip -1 > "${1}"
}

function _pack_xz() {
	pv "${2}" | xz -9e > "${1}"
}

function _unpack_zip() {
	unzip "${1}"
}

function _unpack_7z() {
	7za x "${1}"
}

function _unpack_tgz() {
	pv "${1}" | gzip -d | tar -xf -
}

function _unpack_txz() {
	pv "${1}" | xz -d | tar -xf -
}

function _unpack_tar() {
	pv "${1}" | tar -xf -
}

function _unpack_iso() {
	7za x "${1}"
}

function _unpack_rar() {
	unrar x "${1}"
}

function _unpack_gz() {
	pv "${1}" | gzip -d > "${1%.gz}"
}

function _unpack_xz() {
	pv "${1}" | xz -d > "${1%.xz}"
}