#!/bin/bash
# -*- sh -*-
# vim: ft=sh

: << =cut

=head1 NAME

    du_pattern - plugin to monitor files size selected and grouped by a pattern

=head1 CONFIGURATION

    [du_pattern]
    env.DIR /var/log/apache/
    env.PATTERN www.example.com www.sample.com

    In PATTERN, all items will be expanded like this : www.example.com*
    In this example, you will monitor the size of :
        /var/log/apache/www.example.com*
        /var/log/apache/www.sample.com*

    It's useful if you want to graph the size of your sites' log archives for example,
    one graph per site.

=head1 AUTHOR AND COPYRIGHT

    Copyright 2013-2014 Luc Didry <luc AT didry.org>

=head1 LICENSE

    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 of the License, or
    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/>.

=cut

NAME=${0##*/du_pattern_}

if [ "$1" = "config" ]; then
    echo "multigraph du_pattern_${NAME}"
    echo "graph_title Files size in ${DIR}"
    echo "graph_vlabel size of files"
    echo "graph_category disk"
    echo "graph_total Total"
    echo "graph_info This graph shows the size of files grouped by a pattern."
    FIRST=1
    for i in ${PATTERN}
    do
        CLEAN=${i//\./_}
        echo "$CLEAN.label $CLEAN"
        if [[ $FIRST -eq 1 ]]
    then
        echo "$CLEAN.draw AREA"
        FIRST=0
        else
        echo "$CLEAN.draw STACK"
        fi
    done
    exit 0
fi

for i in ${PATTERN}
do
    CLEAN=${i//\./_}
    FILES="${DIR}/${i}*"
    echo -n "$CLEAN.value "
    echo $(du -cbs ${FILES} | grep total | cut -f 1)
done
exit 0