Ruby script to fetch lyrics from Lyric Wiki

lyrics.rb

# lyrics.rb: Ruby script to fetch lyrics from Lyric Wiki
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Copyright 2012 Siavash Safi
#
# Important Notes:
#  * This is my "Hello World!" in ruby!
#  * I did it just for fun and because I hate to visit wiki pages to read lyrics.
#  * I'm not responsible for what you do with this script!
#  * Enjoy! :)

require 'optparse'
require 'rubygems'
require 'nokogiri'
require 'open-uri'
require 'uri'

options = {}
optparser = OptionParser.new do |opts|
  opts.banner = "Usage: lyrics.rb --artist=ARTIST --song=SONG"

  options[:artist] = nil
  opts.on( '-a', '--artist ARTIST', 'Set the artist' ) do |artist|
    options[:artist] = artist
  end

  options[:song] = nil
  opts.on( '-s', '--song SONG', 'Set the song' ) do |song|
    options[:song] = song
  end

  opts.on( '-h', '--help', 'Display this screen' ) do
    puts opts
    exit
  end
end

optparser.parse!

if options[:artist] == nil || options[:song] == nil
  puts optparser.help
  exit 1
end

def download(url)
  begin
    return open(url)
  rescue OpenURI::HTTPError => e
    puts 'Failed to open: ' + url
    puts 'HTTP Error: ' + e.message
    exit 1
  end
end

# Generate API URL
url = URI::escape('http://lyrics.wikia.com/api.php?artist=' + options[:artist] + '&song=' + options[:song] + '&fmt=xml')
# Call the API to get the lyrics url
xml = Nokogiri::XML(download(url))
# Extract lyrics url from XML document
url = xml.root.at('//LyricsResult//url').content
# Fetch the wiki page
wiki = Nokogiri::HTML(download(url))
# Remove comments
wiki.xpath('//comment()').remove
# Extract lyricbox
lyricbox = wiki.root.at('//body').at_css('div.lyricbox')
# Find and remove ringtone matcher
lyricbox.css('div.rtMatcher').remove
# Print each line separatly so the lyrics are more readable
lyricbox.children.each do |child|
  puts child.text
end

puts 'Lyrics from Lyric Wiki: ' + url