#!/bin/bash

PKGNAME="${1%/}"
ORIGVER="${2}"
NEWVER="${3}"

usage() {
	echo "Usage: ${0##*/} pkgname origver newver"
	echo "  Copies ebuild of orig version to new version and builds it"
	exit 1
}

if [[ $# -ne 1 ]] && [[ $# -ne 3 ]]; then
	usage
fi

pushd ${1} &> /dev/null

# Hacks for 1.0.0 bump, assuming only 1 ebuild in a directory
#ORIGVER=$(ls *.ebuild)
#ORIGVER=${ORIGVER/#${PKGNAME}-}
#ORIGVER=${ORIGVER/%.ebuild}
#NEWVER="1.0.0"

# If we don't get versions, try and autodetect
if [[ -z ${ORIGVER} ]] || [[ -z ${NEWVER} ]]; then
	for (( MAXVER=10; MAXVER >= 0; MAXVER-- )); do
		MAJOR_VER="0.99."
		FULLVER="${MAJOR_VER}${MAXVER}"
		# Autodetect doesn't work if revisions or other weird versions exist
		if [[ -e ${PKGNAME}-${FULLVER}-r*.ebuild ]]; then
			echo "Revision present in newest version; can't autodetect!"
			break
		elif [[ -e ${PKGNAME}-${FULLVER}_*.ebuild ]]; then
			echo "_pre, _rc etc present in newest version; can't autodetect!"
			break
		fi

		if [[ -e ${PKGNAME}-${FULLVER}.ebuild ]]; then
			ORIGVER=${FULLVER}
			NEWVER="${MAJOR_VER}$(( MAXVER + 1 ))"
			break
		fi
	done
fi

mv ${PKGNAME}-${ORIGVER}.ebuild ${PKGNAME}-${NEWVER}.ebuild
for i in *.ebuild; do
	if [[ $i != ${PKGNAME}-${NEWVER}.ebuild ]]; then
		rm $i
	fi
done
GENTOO_MIRRORS="" ebuild ${PKGNAME}-${NEWVER}.ebuild digest
sudo emerge =${PKGNAME}-${NEWVER}
popd &> /dev/null