#!/bin/bash
# Copyright 1999-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: prepman 5507 2007-01-10 04:22:27Z zmedico $

source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh

if [[ -z $1 ]] ; then
	vecho "${0##*/}: at least one argument needed" 1>&2
	exit 1
fi

# setup compression stuff
PORTAGE_COMPRESS=${PORTAGE_COMPRESS-bzip2}
[[ -z ${PORTAGE_COMPRESS} ]] && exit 0

if [[ ${PORTAGE_COMPRESS_FLAGS+set} != "set" ]] ; then
	case ${PORTAGE_COMPRESS} in
		bzip2|gzip)  PORTAGE_COMPRESS_FLAGS="-9";;
	esac
fi

case $1 in
	--suffix)
		if [[ ! -e ${T}/.ecompress.suffix ]] ; then
			set -e
			tmpdir="${T}"/.ecompress$$.${RANDOM}
			mkdir "${tmpdir}"
			cd "${tmpdir}"
			# we have to fill the file enough so that there is something
			# to compress as some programs will refuse to do compression
			# if it cannot actually compress the file
			echo {0..1000} > compressme
			${PORTAGE_COMPRESS} ${PORTAGE_COMPRESS_FLAGS} compressme > /dev/null
			suffix=$(ls compressme*)
			suffix=${suffix#compressme}
			cd /
			rm -rf "${tmpdir}"
			echo "${suffix}" > "${T}/.ecompress.suffix"
		fi
		cat "${T}/.ecompress.suffix"
		;;
	--bin)
		echo "${PORTAGE_COMPRESS} ${PORTAGE_COMPRESS_FLAGS}"
		;;
	*)
		# If a compressed version of the file already exists, simply
		# delete it so that the compressor doesn't whine (bzip2 will
		# complain and skip, gzip will prompt for input)
		suffix=$(ecompress --suffix)
		[[ -n ${suffix} ]] && echo -n "${@/%/${suffix}$'\001'}" | \
			tr '\001' '\000' | ${XARGS} -0 rm -f
		# Finally, let's actually do some real work
		exec "${PORTAGE_COMPRESS}" ${PORTAGE_COMPRESS_FLAGS} "$@"
		;;
esac
