btshare.rb

#!/usr/bin/ruby
require 'fileutils'

=begin
~/.aria2/aria2.conf example
---
seed-ratio=0.0
dht-entry-point=192.168.0.1:6881
dht-listen-port=6881
bt-enable-lpd
bt-save-metadata
=end

def system2(cmd)
  `#{cmd}`
end

target = ARGV[0]
exit unless target

tracker = ''

torrent = "#{target}.torrent"

FileUtils.rm_f(torrent)

result = system2("mktorrent -a '#{tracker}' '#{target}'")
result = system2("aria2c -S '#{torrent}'")
magnet = result.split("\n").find{|l| /^Magnet URI: / === l}
puts magnet.split('&')[0]
exec("aria2c -V -q '#{torrent}'")