Split an NZB into multiple smaller NZBs

nzbsplit.rb

#!/usr/bin/env ruby

def usage() abort("#{$0} [base nzb] [number of new nzbs]") end

file = ARGV.shift
nzb = File.read(file)
num = Integer(ARGV.shift) rescue usage

header, nzb = nzb.split(/(?=<file)/, 2)
files = nzb.scan(/<file.*?<\/file>/m)

files_per_nzb = (files.size / num.to_f).ceil

1.upto(num) do |n|
  fn = "#{File.basename(file, ".nzb")}.#{n}.nzb"
  puts fn
  File.open(fn, "w") do |f|
    f.write header
    files.shift(files_per_nzb).each do |file|
      f.write(file)
    end
    f.write("</nzb>")
  end
end