From: Terje Tjervaag <flecktone@...>
Date: 2005-10-26T21:00:13+09:00
Subject: Re: sort on multiple attributes

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On 10/26/05, Robert Klemme <bob.news@gmx.net> wrote:
> Btw, IMHO you should not need track_number.to_i as they should really be
> stored as numbers.

I agree - in this case I was playing around with making the most
minimal iTunes Music Library parser I could, hence my use of .to_i.
The current 14 line program is attached, if anyone is curious.  It
could be 9 if it wasn't for the error checking.

> Alternative
>
> tracks.sort do |a,b|
>   [:artist, :album, :track_number].each do |field|
>     c =3D a.send(field) <=3D> b.send(field)
>     return c unless c =3D=3D 0
>   end
>   0
> end
>
> <shameless advertising>
> I have also a related RCR pending that still can make it into the std
> lib...
> http://rcrchive.net/rcr/show/293
> </shameless advertising>

I could see those additions being useful - it is a case of where to
hide the inevitable complexity I suppose, and I think your RCR deals
with it in a way that's very easy to read in the end.

--
Terje

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require 'rexml/document'
if !ARGV[0] then puts "Give me the path to the iTunes Music Library.xml file"; exit end
Track = Struct.new("Track", :artist, :album, :track_number, :name, :location, :genre, :track_count)
tracks = []
begin
    REXML::Document.new(File.new(ARGV[0])).elements.each("plist/dict/dict/dict") do |e|
        t = Track.new
        e.elements.each("key"){|e|m=e.text.downcase.gsub(" ","_")+"=";t.send(m,e.next_sibling.text) if t.respond_to?(m)}
        tracks << t
    end
rescue REXML::ParseException
    puts "iTunes Library file format not recognised"
end
tracks.sort_by{|t|[t.artist,t.album,t.track_number.to_i]}.each{|track| puts track.values[0, 4].join(" - ")}



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