ndsrename.rb

#!/usr/bin/ruby

$KCODE='u'
require 'jcode'

require 'rubygems'
require 'bindata'

class NDSHeader < BinData::MultiValue
  array :header, :type => :uint8, :initial_length => 0x68
  uint32le :icon_tiles  # 0x68
end

class Banner < BinData::MultiValue
  uint16le :version
  uint16le :crc
  array :reserved, :type => :uint8, :initial_length => 28
  array :tile, :type => :uint8, :initial_length => 512
  array :palette, :type => :uint8, :initial_length => 32
  string :japanese, :read_length => 256
  string :english, :read_length => 256
end

saves = Dir.glob('../SAVE/*.*')

Dir.glob('*.nds', File::FNM_CASEFOLD).each do |rom|
  file = File.open rom
  header = NDSHeader.new
  header.read file
  #puts format("0x%0x", header.icon_tiles)

  file.seek header.icon_tiles, IO::SEEK_SET
  banner = Banner.new
  banner.read file
  file.close

  romname = rom.split('.').first
  title = banner.english.split(/\0/).join.gsub(/[^0-9A-Za-z]/,'_').squeeze("_ ")

  puts "mv '#{rom}' '#{title}.nds'" if title != romname

  save = saves.select{|s| File.basename(s).downcase.split('.').first == romname.downcase}.first
  if save
    puts "mv '#{save}' '../SAVE/#{title}.sav'" if "#{save}" != "../SAVE/#{title}.sav"
  end
end