lyrics downloader from genius.com with API+Scraping 🏴‍☠️

genio.rb

require 'rest-client'
require 'nokogiri'
require 'genius'
require 'similar_text'
require 'optparse'

GENIUS_CLIENT_TOKEN = 'YOUR API TOKEN GOES HERE!!!'.freeze

class LyricsNotFound < StandardError; end

class LyricsFinder
  # change this constant if you want to increase or decrease the percentage
  # of similarity between the artist entered by the user and the artist
  # found on genius.com
  PERCENTAGE_OF_SIMILARITY = 80

  def initialize(api_key)
    Genius.access_token = api_key
  end

  def lyrics(track_name, track_artist)
    # beautify the song name removing the featuring in order to be easily
    # searchable on genius.com

    track_name.gsub!(/\((.*?)\)/, '')
    track_artist.gsub!(/\((.*?)\)/, '')

    track_name.gsub!(/.((ft\.|feat).*?)$/mi, '')
    track_artist.gsub!(/.((ft\.|feat).*?)$/mi, '')

    songs = Genius::Song.search("#{track_artist} #{track_name}")
    song_found = songs.first

    # if first method returns nil or song artist found is not similar by 80%
    # to the artist entered by the user then lyrics is not found

    if song_found.nil? ||
       (song_found.resource['primary_artist']['name'].downcase.similar(track_artist.downcase) < PERCENTAGE_OF_SIMILARITY)
      raise LyricsNotFound, "Lyrics not found for #{track_name}"
    end

    # download html content from the genius.com website and parse the div
    # lyrics downloading only the text removing extra tags

    html_content = RestClient.get(song_found.url)

    doc = Nokogiri::HTML::Document.parse(html_content)
    div = doc.at_css('div[data-lyrics-container=true]')
    div.css('br').each do |node|
      node.replace(Nokogiri::XML::Text.new("\n", div))
    end

    div.text
  end
end

options = {}
OptionParser.new do |opts|
  opts.banner = 'Usage: ruby genio.rb [options]'

  opts.on('-n', '--name=NAME', 'Track name') { |value| options[:name] = value }
  opts.on('-a', '--artist=NAME', 'Artist name') { |value| options[:artist] = value }
  opts.on('-h', '--help', 'Show this awesome help') { puts opts; exit }
end.parse!

if options[:name].nil? || options[:artist].nil?
  abort('Specify artist and track name, check genio.rb --help')
end

finder = LyricsFinder.new(GENIUS_CLIENT_TOKEN)

begin
  lyrics = finder.lyrics(options[:name], options[:artist])
  puts lyrics
rescue LyricsNotFound
  puts 'Lyrics not found on genius.com'
rescue Genius::AuthenticationError
  puts 'Error occurred while using genius.com API'
end