#!/bin/sh
#
# Copyright © 2013 Jonas Smedegaard <dr@jones.dk>
# Description: render and publish event webpage from RDF data
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

# defaults sensible for the author when invoked from project root
outfile=events.html
infiles="data/*/*.ttl data/*/*/*.ttl"
rsync_credentials=coreander
rsync_path=/home/jonas/public_websites/data.biks.dk/events/index.html
script=bin/rdf2events

# make backup of eventual existing output
if [ -f $outfile~ ]; then
	echo >&2 "ERROR: old tempfile $outfile~ exist!"
	echo >&2 "Check that script isn't already running, remove the file, and try again."
	exit 1
fi

echo "Rendering $outfile..."
$script $infiles > $outfile~

if [ -f $outfile ]; then
	echo "Comparing $outfile against older version..."
	errorcode=0
	diff -ruN $outfile $outfile~ || errorcode=$?
	case $errorcode in
		0) echo "No changes from previous version"; rm $outfile~; exit;;
		1) printf "Above are changes from previous version. ";;
		*) echo >&2 "ERROR: internal diff error!"; exit $errorcode;;
	esac
fi

# ask, publish, and update on-disk file for later comparison
printf "OK to publish (y/N)? "
read do_update
case $do_update in
    y|Y)
	echo "Publishing $outfile..."
	rsync -a $outfile~ $rsync_credentials:$rsync_path
	mv -f $outfile~ $outfile
	echo "Done: $outfile published succesfully!"
	;;
    *)
	rm $outfile~
	echo "Cancelled, as requested."
	exit
	;;
esac