#!/bin/sh
# -*- sh -*-

: <<=cut

=head1 NAME

tr_ratios - monitor transfer ratios of the "transmission" bittorent program

=head1 APPLICABLE SYSTEMS

Any system with "transmission" installed and a transmission daemon running.

=head1 CONFIGURATION

Maybe you need to configure access credentials and connection settings:

  [tr_ratios]
  env.host localhost
  env.port 9091
  env.username alice
  env.password secret

=head1 MAGIC MARKERS

  #%# family=auto
  #%# capabilities=autoconf

=head1 AUTHOR

unspecified

=head1 LICENSE

unspecified

=cut


CONNECTION_ARG="${host:-localhost}:${port:-9091}"
USERNAME="${username:-}"
PASSWORD="${password:-}"


# return a space separated list of transmissions with the following columns:
#  * fieldname
#  * ratio (in percent)
#  * name of the transmissions
request_transmission_stats() {
	if [ -n "$USERNAME$PASSWORD" ]; then
		transmission-remote "$CONNECTION_ARG" --auth "$USERNAME:$PASSWORD" --list
	else
		transmission-remote "$CONNECTION_ARG" --list
	fi | awk '
		BEGIN { FIELDWIDTHS = "7 4 13 10 7 9 7 13 40" }
		NR > 1 {
			split($1,torrentid," ")
			# remove "*" from the ID of stopped transmissions
			sub(/\*/, "", torrentid[1])
			if (torrentid[1] != "Sum:") {
				split($7,ratio," ")
				ratio[1] = ratio[1] * 100
				print "ID" torrentid[1], ratio[1], $9
			}
		}'
}


if [ "$1" = "autoconf" ]; then
	if [ -n "$(request_transmission_stats 2>/dev/null)" ]; then
		echo "yes"
	else
		if which transmission-remote >/dev/null; then
			echo "no (failed to connect to daemon)"
		else
			echo "no (missing 'transmission-remote' program)"
		fi
	fi
        exit 0
fi

if [ "$1" = "config" ]; then
        echo "graph_title Transmission seed ratios"
	echo "graph_vlabel Seed ratio %"
	echo "graph_category torrent"
	echo "graph_info This plugin shows your transmission ratios per torrent"
	request_transmission_stats | awk '{print $1 ".label " $3 }' | iconv -f utf-8 -t ascii//translit
        exit 0
fi

request_transmission_stats | awk '{print $1 ".value " $2 }'
