backup_tagger

#!/usr/bin/env ruby

# run with ARGV[0] pointed at an iPhone backup directory to re-tag the files
# with extensions.
#
# written under the influence of learning haskell / clojure / frp so also quite
# possibly the worst ruby ever written.

class String
  def iphone_extension
    types = {
      /JPEG/i         => 'jpg',
      /PNG/i          => 'png',
      /Apple binary/i => 'plist',
      /ASCII/i        => 'txt',
      /QuickTime/i    => 'mov',
      /SGML/i         => 'html',
      /HTML/i         => 'html',
      /data/i         => 'raw',
      /XML/i          => 'xml',
      /MPEG ADTS/     => 'mp3',
      /vCard/i        => 'vcard',
      /iTunes AAC/i   => 'm4a',
      /PDF/           => 'pdf',
      /CoreAudio/     => 'caf',
    }
    @iphone_file_type ||= types.keys.select {|t| self =~ t}.map {|match| types[match]}.first
  end
  def detect_file_type
    `file #{self}`.strip.split(": ")
  end
end

class Array
  def rename_using_type
    `mv #{self[0]}{,.#{self[1].iphone_extension}}` if self[1].iphone_extension
  end
end

Dir[File.join(ARGV[0],'*')]
  .map(&:detect_file_type)
  .each(&:rename_using_type)