Asp Forum - Finding Duplicate MP3s

ga rg

12/1/2007 3:17:00 AM

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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3 Answers

Judson Lester

12/4/2007 12:55:00 AM

Note: parts of this message were removed by the gateway to make it a legal Usenet post.

On Nov 30, 2007 7:16 PM, Khurrum Ma <khurrum1@gmail.com> wrote:

> I don't always know the best programmer practices and it would help me
>

Sure.

> 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()

Meh. I'd pass source and dest to initialize directly. I'd call
showallduplicates() on the DuplicateMP3 object directly. If you really
want, add a class method like

def self.do_it(src, dest)
mover = new(src,dest)
mover.showallduplicates()
end

Maybe. I'm shaky on this actually needing to be a class, but I guess it
works okay...

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
>

Here's the biggest thing: look into using Find (in the standard library.)
It's almost always superior to Dir, unless you really don't want to recurse
at all.

>
> Dir["**/*.mp3"].each do |file|
> if File.file?(file)
> Mp3Info.open(file) do |mp3|
> unique = mp3.tag.title.to_s + mp3.length.to_s

I'd use [mp3.tag.title.to_s, mp3.length] instead. It's certainly a corner
case, but it'd be a shame if you had "song" that was 210 long treated as a
dupe of "song2", 10 long.

> if (duplicates.has_key?(unique))
> puts "duplicate: #{file}. Moving..."
> movedupes(file)
> else
> duplicates[unique].push(file)

Meh again. Use a regular hash, and replace this line with
"duplicates[unique] = true" since you don't ever use the values of the
duplicates hash.

end
> end
> end
> end
> end
>
> def movedupes(file)

And the solution to your input problem is:
"source = File::join(@dir_source, file.to_s)"
If you use Find, it'll be a little easier here, and tricker in the
destination, because Find will give you the full path anyway.

> source = @dir_source + file.to_s

Instead of File.basename, you'll want to use something else. If you're
using Find, you'll get reasonably full paths, so you might be able to do
something like
file.to_s.sub(%r{^#{Regexp::escape(@dir_source)}}, "")
which will find the source path and replace it with an empty string. I
don't know a better way work with the paths, honestly.
And you'd use File::join again here, as well.

> dest = @dir_destination + File.basename(file.to_s)
> File.move(source, dest)
> puts "file moved"
> end
>
> end
>
> find = DuplicateMP3.new()

Ultimately, I think you want to have this look like
if($0 == __FILE__)
#Put the ARGV.length check here
find = DuplicateMP3.new(ARGV[0], ARGV[1])
find.showallduplicates()
end

>
> --
> Posted via http://www.ruby-....
>
>

--
Your subnet is currently 169.254.0.0/16. You are likely to be eaten by a
grue.

Judson Lester

12/4/2007 1:01:00 AM

Note: parts of this message were removed by the gateway to make it a legal Usenet post.

On Dec 3, 2007 4:55 PM, Judson Lester <nyarly@gmail.com> wrote:

>
>
> On Nov 30, 2007 7:16 PM, Khurrum Ma <khurrum1@gmail.com> wrote:
>
> > I don't always know the best programmer practices and it would help me
> >
>
> Sure.
>
>
> > 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()
>
>
> Meh. I'd pass source and dest to initialize directly. I'd call
> showallduplicates() on the DuplicateMP3 object directly. If you really
> want, add a class method like
>
> def self.do_it(src, dest)
> mover = new(src,dest)
> mover.showallduplicates()
> end
>
> Maybe. I'm shaky on this actually needing to be a class, but I guess it
> works okay...
>
> 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
> >
>
> Here's the biggest thing: look into using Find (in the standard library.)
> It's almost always superior to Dir, unless you really don't want to recurse
> at all.
>
> >
> > Dir["**/*.mp3"].each do |file|
> > if File.file?(file)
> > Mp3Info.open(file) do |mp3|
> > unique = mp3.tag.title.to_s + mp3.length.to_s
>
> I'd use [mp3.tag.title.to_s, mp3.length] instead. It's certainly a corner
> case, but it'd be a shame if you had "song" that was 210 long treated as a
> dupe of "song2", 10 long.
>
>
> > if (duplicates.has_key?(unique))
> > puts "duplicate: #{file}. Moving..."
> > movedupes(file)
> > else
> > duplicates[unique].push(file)
>
> Meh again. Use a regular hash, and replace this line with
> "duplicates[unique] = true" since you don't ever use the values of the
> duplicates hash.
>
> end
> > end
> > end
> > end
> > end
> >
> > def movedupes(file)
>
>
> And the solution to your input problem is:
> "source = File::join(@dir_source, file.to_s)"
> If you use Find, it'll be a little easier here, and tricker in the
> destination, because Find will give you the full path anyway.
>
> > source = @dir_source + file.to_s
>
>
> Instead of File.basename, you'll want to use something else. If you're
> using Find, you'll get reasonably full paths, so you might be able to do
> something like
> file.to_s.sub(%r{^#{Regexp::escape(@dir_source)}}, "")
> which will find the source path and replace it with an empty string. I
> don't know a better way work with the paths, honestly.
> And you'd use File::join again here, as well.
>
> > dest = @dir_destination + File.basename(file.to_s)
> > File.move(source, dest)
> > puts "file moved"
> > end
> >
> > end
> >
> > find = DuplicateMP3.new()
>
> Ultimately, I think you want to have this look like
> if($0 == __FILE__)
> #Put the ARGV.length check here
> find = DuplicateMP3.new(ARGV[0], ARGV[1])
> find.showallduplicates()
> end
>
> >
> > --
> > Posted via http://www.ruby-....
> >
> >
>
>
> --
> Your subnet is currently 169.254.0.0/16. You are likely to be eaten by a
> grue.

--
Your subnet is currently 169.254.0.0/16. You are likely to be eaten by a
grue.

ga rg

12/5/2007 9:52:00 PM

Judson Lester wrote:
> On Dec 3, 2007 4:55 PM, Judson Lester <nyarly@gmail.com> wrote:

Thank you very much. This is incredibly helpful. I'm sure this will be
useful to other beginners as well.
--
Posted via http://www.ruby-....

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Finding Duplicate MP3s

ga rg

Judson Lester

Judson Lester

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