#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  backup [-q] [-C COMMENT] [-x] [ARCHIVE_TAG]
		  backup -h
	EOF
}

help() {
	cat <<-'EOF'


		Options:
		  -q             disable verbose mode, useful for
		                 non-interactive sessions
		  -C COMMENT     the comment text to be attached to the archive
		  -h, --help     show this message

		  ARCHIVE_TAG    the tag used to create the new
		                 backup (default: "manual")


		The repository is expected to have been created with:

		  $ borg init -e repokey-blake2

		The following environment variables are expected to be exported:

		  $BORG_PASSCOMMAND
		  $BORG_REPO
		  $BORG_REMOTE_PATH

		Password-less SSH access is required, usually done via adding
		~/.ssh/id_rsa.pub to suyin:.ssh/authorized_keys.


		Examples:

		  Run backup manually:

		    $ backup


		  Create backup with comment, and verbose mode active:

		    $ backup -qC 'The backup has a comment' my-backup
	EOF
}

for flag in "$@"; do
	case "$flag" in
		(--)
			break
			;;
		(--help)
			usage
			help
			exit
			;;
		(*)
			;;
	esac
done

VERBOSE_FLAGS='--verbose --progress'
COMMENT=''
while getopts 'qC:h' flag; do
	case "$flag" in
		(q)
			VERBOSE_FLAGS=''
			;;
		C)
			COMMENT="$OPTARG"
			;;
		(h)
			usage
			help
			exit
			;;
		(*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))


ARCHIVE_TAG="${1:-manual}"


set -x
# The contents of $VERBOSE_FLAGS doesn't involve user input:
# shellcheck disable=2086
borgy \
	$VERBOSE_FLAGS                    \
	--comment "$COMMENT"              \
	"::{hostname}-{now}-$ARCHIVE_TAG" \
	~/