#!/bin/bash

#    IngRRD (https://forge.riquer.fr/p/ingrrd/)
#    Copyright (C) 2014-2015  Vincent Riquer
#
#    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.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

readold() {
	local	when=$1		\
		line		\
		dataindex	\
		empty		\
		id		\
		LANG=C
	{
		read line
		dataindex=( $line )
		read empty
		read first['time'] $(
				for id in ${dataindex[@]}
				do
					echo "first['"$id"']"
				done
			)
	} < <(
		rrdtool fetch -s "$when" "$rrdfile" AVERAGE | sed '/: nan/d'
	)
}