#!/bin/bash -
#
# copy a package directory from the portage tree to overlay
# [dirtyepic@gentoo.org]

source /usr/lib/portage/bin/isolated-functions.sh

PORTDIR="$(portageq portdir)"
CVSDIR="/home/dirtyepic/cvs/gentoo-x86"
OVERLAYDIR="/home/dirtyepic/overlay"
DEVOVERLAYDIR="/home/dirtyepic/svn/dirtyepic"
GCCOVERLAYDIR="/home/dirtyepic/svn/gcc-porting"

print_usage() {
	echo
	eerror "Usage:  cp2overlay  [--fromcvs] [--dev] [--gcc] <package>"
	eerror "                    [--help]"
	eerror
	eerror "                    default is ${OVERLAYDIR}"
	eerror "                    --dev is ${DEVOVERLAYDIR}"
	eerror "                    --gcc is ${GCCOVERLAYDIR}"
	eerror "                    --fromcvs copies from ${CVSDIR} instead of ${PORTDIR}"
	echo
}

if [[ -z $1 || $# -gt 3 ]]; then
	print_usage
	exit 1
fi

while [[ ${1#--} != ${1} ]]; do
	if [[ ${1} == "--help" ]]; then
		print_usage
		exit 0
	elif [[ ${1} == "--fromcvs" ]]; then
		CVSUP=true
		PORTDIR=${CVSDIR}
		shift
	elif [[ ${1} == "--dev" ]]; then
		OVERLAYDIR="${DEVOVERLAYDIR}"
		shift
	elif [[ ${1} == "--gcc" ]]; then
		OVERLAYDIR="${GCCOVERLAYDIR}"
		shift
	elif [[ ${1} == "--" ]]; then
		shift
		break
	else
		echo
		eerror "Unknown option: ${1}"
		print_usage
		exit 1
	fi
done

PKGCAT=${1%%/*}
PKGNAME=${1##*/}

[[ $PKGCAT == $PKGNAME ]] && PKGCAT=""

if [[ -z ${PKGCAT} ]]; then
	if [[ -e ${PORTDIR}/.ebuild.x ]]; then
		CATEGORY=$(sed -n "\\|/${1}/|s:/[^/]*\$::p" "${PORTDIR}"/.ebuild.x | uniq)
	else
		pushd "${PORTDIR}" &> /dev/null
		CATEGORY=$(ls -1d $(sed "s:\$:/${1}:" profiles/categories) 2>/dev/null)
		popd &> /dev/null
	fi

	if [[ $(echo ${CATEGORY} | wc -w) -gt 1 ]]; then
		echo
		eerror "Found multiple categories for \"${1}\"."
		eerror "Please use a fully qualified package name (cat/package)."
		echo
		exit 1
	fi
	PKGCAT="${CATEGORY%%/*}"
fi

PORTFULL="${PORTDIR}/${PKGCAT}/${PKGNAME}"
OVERLAYFULL="${OVERLAYDIR}/${PKGCAT}/${PKGNAME}"

if [[ ! -d ${PORTFULL} ]]; then
	echo
	eerror "Can't find package \"${1}\" in the portage tree."
	echo
	exit 1
elif [[ -d ${OVERLAYFULL} ]]; then
	echo
	eerror "${PKGCAT}/${PKGNAME} already exists in the overlay."
	echo
	exit 1
else
	mkdir -p ${OVERLAYFULL}
	pushd ${PORTFULL} > /dev/null
	[[ ${CVSUP} ]] && cvs up
	tar -cf - --exclude='CVS' . | tar -xf - -C ${OVERLAYFULL}
	popd > /dev/null
fi

echo
einfo "Copied ${PORTFULL} to ${OVERLAYFULL}"
echo

exit 0