#!/bin/sh

: << =cut

=head1 NAME

file_length_ - Plugin to monitor the length of specified files

Useful for things such as lists (white, black, user, ...).

=head1 CONFIGURATION

    [file_length_IDENTIFIER]
    env.files FILEPATHGLOB1 FILEPATHGLOB2 ...
    env.category DEFAULTS_TO_system
    env.title OPTIONAL_TITLE
    env.logarithmic 1

=head1 AUTHOR

Olivier Mehani <shtrom+munin@ssji.net> (based on disk/log_sizes)

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

  #%# family=manual

=cut

# needs shellcheck -x /usr/share/munin/plugins/plugin.sh
# shellcheck source=/usr/share/munin/plugins/plugin.sh
. "$MUNIN_LIBDIR/plugins/plugin.sh"

NAME=$(echo "$0" | sed 's/.*_//')
TITLE=${title:-File lengths for $NAME}
CATEGORY=${category:-system}

FILES=${files:-/var/log/messages}
# we want globbing to happen here
# shellcheck disable=SC2116 disable=SC2086
FILES=$(echo $FILES)


if [ "$1" = "config" ] ; then
	# shellcheck disable=SC2154
	if [ "${logarithmic}" = "1" ]; then
		graph_args="-o"
	else
		graph_args="-l 0"
	fi
	cat <<EOF
graph_title ${TITLE}
graph_args ${graph_args} --base 1000
graph_category ${CATEGORY}
graph_info This graph shows the length of ${FILES}
graph_vlabel length (lines)
EOF

	for F in $FILES; do
		MF=$(clean_fieldname "$F")
		BF=$(basename "$F")
		echo "$MF.label ${BF}"
	done

else
	for F in $FILES; do
		MF=$(echo "$F" | sed 's/[-\/\.]/_/g')
		echo "$MF.value $(wc -l < "$F")"
		echo "$MF.extinfo $(stat --printf="%sB\n" "$F")"
	done
fi