Vimeo Downloader

vimeo_downloader.rb

#!/usr/bin/env ruby   
=begin

Vimeo Downloader v1.0 by Jaroslaw Zabiello (http://zabiello.com)
based on http://cl.ly/2T1x180I251j301L1C3r/vimeo_downloader.sh  
found thanks to http://goo.gl/AN5sf :)

Requirements: 
* Ruby 1.8 or newer
* nokogiri (http://nokogiri.org)
* wget or curl

=end
    
require 'rubygems' if RUBY_VERSION =~ /^1.8/ 
                                         
require 'net/http' 
require 'open-uri'  
begin                 
  require 'nokogiri' 
rescue Exception => ex
  puts "Installing nokogiri, please wait..."
  puts `gem install nokogiri`
end

begin                                         
  vimeo_id = ARGV[0].split('/').last
rescue
  puts <<-HELP
  Usage: ruby #{File.basename(__FILE__)} vimeo_id_or_url
  E.g. ruby #{File.basename(__FILE__)} 31733477
       ruby #{File.basename(__FILE__)} http://vimeo.com/31733477
  HELP
  exit
end   

url = "http://www.vimeo.com/moogaloop"
xml = Nokogiri::XML open("#{url}/load/clip:#{vimeo_id}") 
signature = xml.xpath('//request_signature').text
expires   = xml.xpath('//request_signature_expires').text
caption   = xml.xpath('//caption').text
ishd      = xml.xpath('//isHD').text == '1' ? 'hd' : 'sd'
filename  = "#{vimeo_id}-#{ishd}.flv"                  
uri = "#{url}/play/clip:#{vimeo_id}/#{signature}/#{expires}/?q=#{ishd}"

if !`which curl`.empty?
  `curl -A wget -L #{uri} > #{filename}`  
elsif !`which wget`.empty?
  `wget -c -t 0 #{uri} -O #{filename}`
else 
  puts "You need wget or curl installed"
end