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#!/bin/zsh
die() {
	print -r - "$@"
	exit 1
}

if [[ -z $SNAP_SRC ]]; then
	SNAP_SRC=$1;shift
fi
SNAP_SRC=${SNAP_SRC%%/}

if [[ -z $SNAP_DST ]]; then
	SNAP_DST=$1;shift
fi
SNAP_DST=${SNAP_DST%%/}

rsync=( rsync -aA --delete "$@" )

marks=( $SNAP_SRC/.snapshot.[0-9]*(N) )
(( $#marks != 1 )) && die invalid marks ${(qqq)marks}

if [[ $SNAP_DST == *:* ]]; then
	# remote
	[[ $SNAP_DST == *.push ]] || SNAP_DST=$SNAP_DST.push
	$rsync  --exclude=/.snapshot.\* $SNAP_SRC/ $SNAP_DST/ && \
	$rsync  $SNAP_SRC/ $SNAP_DST/
else
	# local
	[[ -d $SNAP_DST ]] || die destination not a directory: ${(qqq)SNAP_DST}
	ts=${marks##*.}
	snapshots=( ${SNAP_DST}/.snapshot.[1-9]*(N) )
	if (($#snapshots)); then
		link=${SNAP_DST}/${${snapshots[-1]}##*.}
		$rsync --link-dest=$link $SNAP_SRC/ $SNAP_DST/$ts/ || exit $?
	else
		$rsync $SNAP_SRC/ $SNAP_DST/$ts/ || exit $?
	fi
	touch ${SNAP_DST}/$marks:t
fi