#!/bin/sh

NCC=/usr/bin/nextcloudcmd
if ! [ -x ${NCC} ]; then
	echo "There is no ${NCC}."
	exit 2
fi

IWAIT=/usr/bin/inotifywait
if ! [ -x ${IWAIT} ]; then
	echo "There is no ${IWAIT}."
	exit 2
fi

usage() {
	cat << EOF

Calls nextcloudcmd to sync a source directory and server url. The script
triggers a synchronization when (i) the source directory was changed or (ii)
after some period, whatever happens first. The nextcloudcmd is called with
netrc for login.

Usage:
 $0 [OPTIONS] source_dir server_url [ARGS...]
 $0 -h

OPTIONS:
  -h        Show this text
  -o        One-shot instead of looping
  -s        Silent, be less verbose
  -t SECS   Sync period if nothing changed locally.
            Default: 180
  ARGS      Passed to nextcloudcmd

EXAMPLE
    $0 ~/.vimwiki https://cloud.example.com --path vimwiki
EOF
}

NCC_OPTS="-n"
IWAIT_OPTS=""

SILENT=0
ONESHOT=0
PERIOD=600

while getopts "host:" OPTION; do
	case "${OPTION}" in
		h)
			usage
			exit
			;;
		o)
			ONESHOT=1
			;;
		s)
			SILENT=1
			NCC_OPTS="${NCC_OPTS} -s"
			IWAIT_OPTS="${IWAIT_OPTS} -q"
			;;
		t)
			PERIOD=${OPTARG}
			;;
		*)
			usage
			exit 1
			;;
	esac
done
shift $((OPTIND-1))

SOURCE_DIR=$1
SERVER_URL=$2
shift
shift

if [ -z "${SOURCE_DIR}" ] ; then
	echo "No source directory given."
	usage
	exit 1
fi

if [ -z "${SERVER_URL}" ] ; then
	echo "No server URL given."
	usage
	exit 1
fi

NCC_OPTS="${NCC_OPTS} $@ ${SOURCE_DIR} ${SERVER_URL}"

while true; do
	echo "About to sync..."
	sleep 2
	[ "$SILENT" = "1" ] || echo "[$(date '+%F %X')] Perform sync..."

	${NCC} ${NCC_OPTS}

	[ "${ONESHOT}" = "1" ] && break

	sleep 3
	[ "$SILENT" = "1" ] || echo ""
	[ "$SILENT" = "1" ] || echo "[$(date '+%F %X')] Wait for ${PERIOD} secs or source directory change."
	${IWAIT} ${IWAIT_OPTS} -t ${PERIOD} -r -e modify -e move -e create -e delete ${SOURCE_DIR}
done