Ruby script to extract Renoise version info from xrns file

what-version-is-this-xrns.rb

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


=begin

An xrns file is just a zip file with a special file extension.
That archive holds a number of files.  One of these is Song.xml.

This XML has a root element with an attribute named 'doc_version'

    <RenoiseSong doc_version="63">

This version seems to differ with each Renoise release.

This script attempts to grab and parse Song.xml, inspect that attribute,
and report back a Renoise version number.

So far it's only been run on Windows 10 and assumes you have 7z.exe 
installed and on your path

There are pure-ruby zip libraries, but they can be a pain in the butt.

It's kinda hacky; feel free to make it super-awesome.   

Add more doc_version => renoise_version mappings as you learn them.

James Britt  / Neurogami

james@neurogami.com

Now go listen to my music and buy my albums for all your friends and family:

  http://music.jamesbritt.com
  
  http://music.neurogami.com


=end


RE = /(doc_version=")(.+)(".*)/

TMP = '_tmp'
# h/t http://forum.renoise.com/index.php/topic/49519-rns-files-have-the-renoise-version-info/#entry356566
VERSIONS = {
  4 => 1.8,
  9 => 1.9,
  10 => 1.9.1,
  14 => 2.0,
  15 => 2.1,
  21 => 2.5,
  22 => 2.6,
  30 => 2.7,
  37 => 2.8,
  54 => 3.0,
  63 => 3.1
}

xrns = ARGV.shift

if !xrns
  warn "Usage: #{__FILE__} <path to xrns file> [-c]"
  warn "The optional -c arg will clean up the tmp folder created when extracting the song info."
  exit
end

unless File.exist? xrns
  warn "Cannot find '#{xrns}'"
  exit
end

unless xrns =~ /\.xrns$/
  warn "'#{xrns}' is not an xrns file"
  exit
end

unless File.exist? TMP 
  Dir.mkdir TMP 
end

FileUtils.cp xrns, TMP 

Dir.chdir(TMP) do
  if File.exist? 'Song.xml'
    FileUtils.rm_rf 'Song.xml'
  end
  cmd = %~7za.exe x "../#{xrns}" Song.xml ~
  warn cmd
  warn `#{cmd}`
  lines = IO.readlines 'Song.xml'
  root = lines[1]
  m = RE.match root
  renoise_version = VERSIONS[m[2]]

  puts '.' * 90
  puts
  if renoise_version 
    puts "'#{xrns}' was made using Renoise #{renoise_version}"
  else
    puts "Sorry. Do not have any info for doc_version #{m[2]}"
  end

end

if ARGV.first =~ /-c/
  FileUtils.rm_rf TMP 
end