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#!/bin/sh

# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.

readonly BASEDIR="$(CDPATH="" cd -- "$(dirname -- "$0")/.." && pwd -P)"

main()
{
	# Handle opts
	while getopts ":h" opt
	do
		case "$opt" in
			h) usage && exit 0 ;;
			*)
				printf "Invalid option passed: %s\n" "$OPTARG" >&2
				;;
		esac
	done

	shift $(( OPTIND - 1 ))

	if [ $# -lt 1 ]
	then
		printf "Must specify a directory to publish the site at\n"
		exit 3
	fi

	output=$1

	# Ensure output directory exists
	if [ ! -d "$output" ]
	then
		printf "No such directory: %s\n" "$output"
		exit 4
	fi

	# Make ZFS snapshot
	if awk '$3 == "zfs" { print $2 }' < /proc/mounts | grep -q "$output"
	then
		zfs_subvol="$(zfs list -o name,mountpoint | awk '$2 == "'"$output"'" { print $1 }')"
		zfs_snapshot="$zfs_subvol@$(date +%FT%T)"

		printf "Creating ZFS snapshot %s\n" "$zfs_snapshot"

		sudo zfs snapshot "$zfs_snapshot"
	fi

	# Publish new site source
	cd -- "$BASEDIR/src"
	bundle install
	bundle exec jekyll build -d "$output"
}

usage()
{
	cat <<EOF
Usage:
	${0##*/} -h

Nondescript

Options:
	-h  Show this help text and exit.
EOF
}

main "$@"