Useful if your mp3 player doesn't like fancy long filenames

shorten-mp3-names.rb

#!/usr/bin/env ruby
#
# Useful if your mp3 player doesn't like fancy long filenames
#

require 'digest/sha1'

Dir.glob("*.mp3") do |f|
        name = f.downcase.split(".");
        next if name.length < 2
        ext = name.pop
        name = name.join.gsub(/(^|[-'()_ ]+)(\S|$)/) do
                s = $2.upcase
                if $1 =~ /^-/
                        s = "-#{s}"
                else
                        s
                end
        end
        name = name[0...27] + "~" + Digest::SHA1.hexdigest(name)[0..3] if name.length > 32
        begin
                File::rename(f, "#{name}.#{ext}") and puts "'#{f}' successfully renamed"
        rescue SystemCallError => e
                puts "Error renaming '#{f}'"
        end
end