From: Khurrum Ma <khurrum1@...>
Date: 2007-12-01T12:16:53+09:00
Subject: Finding Duplicate MP3s

I'm a RubyNoobie and I am writing a few random scripts to learn the
language. Would it be alright to post scripts to get them criticized by
pros?

This is supposed to search a folder to find duplicate MP3s and move them
to a destination directory.

*When you search a directory structure with lots of branches then
mp3info gives an error.
*The source and destination folders NEED to have the backslash \ or else
the script does horrible things. So it needs better input checking

I don't always know the best programmer practices and it would help me
if someone can make suggestions.


# Finds duplicate MP3s and move them to stated destination
# usage: duplicatemp3.rb c:\source\dir\ c:\destination\dir\
# the ending \ slash is REQUIRED
require "mp3info"
require "ftools"

class DuplicateMP3
  def initialize()
    unless ARGV.length == 2
      puts "usage: duplicatemp3.rb c:\source\dir\ c:\destination\dir\"
      exit
    end
  @dir_source = ARGV[0]
  @dir_destination = ARGV[1]

    showallduplicates()
  end

  def showallduplicates()
    directory = @dir_source
    duplicates = Hash.new { |h,k| h[k] = [] }
    Dir.chdir(@dir_source)

#Check if the file is a file then
#Make a unique ID with the mp3 title and mp3 song length combined
#Enter unique into the hash as a key
#If unique key is already in the hash then move the file to destination
folder

    Dir["**/*.mp3"].each do |file|
      if File.file?(file)
        Mp3Info.open(file) do |mp3|
          unique = mp3.tag.title.to_s + mp3.length.to_s
          if (duplicates.has_key?(unique))
            puts "duplicate: #{file}. Moving..."
            movedupes(file)
          else
              duplicates[unique].push(file)
          end
        end
      end
    end
  end

  def movedupes(file)
    source = @dir_source + file.to_s
    dest = @dir_destination + File.basename(file.to_s)
    File.move(source, dest)
    puts "file moved"
  end

end

find = DuplicateMP3.new()
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