ePub playOrder fix for Ulysses export

fix-epub.rb

#!/usr/bin/env ruby
cnt = 1
cmd = ARGV[0]
file = ARGV[1]

begin
if cmd == "unzip"
  system "unzip", "-q", file
  ARGV.replace ["OPS/toc.ncx"]
elsif cmd == "zip"
  system "zip", "-f", file
  exit
end


ARGF.each_line do |line|

  if /playOrder/.match(line)
   line.sub!(/playOrder="1"/, "playOrder=\"#{cnt}\"")
   cnt += 1
  end
  puts line
end
rescue
  puts "Oops. Something went wrong."
end

Updated to search for full 'playOrder="1"' string instead of each digit.