My repurposed yahoo-finance gem -- dumped it straight in my rails lib folder

yahoo_finance.rb

require 'open-uri'
require 'csv'

class YahooFinance
  
#   VERSION = '0.1.0'

   COLUMNS = {
     :ask => "a",
     :average_daily_volume => "a2",
     :ask_size => "a5",
     :bid => "b",
     :ask_real_time => "b2",
     :bid_real_time => "b3",
     :book_value => "b4",
     :bid_size => "b6",
     :chance_and_percent_change => "c",
     :change => "c1",
     :comission => "c3",
     :change_real_time => "c6",
     :after_hours_change_real_time => "c8",
     :dividend_per_share => "d",
     :last_trade_date => "d1",
     :trade_date => "d2",
     :earnings_per_share => "e",
     :error_indicator => "e1",
     :eps_estimate_current_year => "e7",
     :eps_estimate_next_year => "e8",
     :eps_estimate_next_quarter => "e9", 
     :float_shares => "f6", 
     :low => "g",
     :high => "h",
     :low_52_weeks => "j",
     :high_52_weeks => "k",
     :holdings_gain_percent => "g1",
     :annualized_gain => "g3",
     :holdings_gain => "g4",
     :holdings_gain_percent_realtime => "g5",
     :holdings_gain_realtime => "g6",
     :more_info => "i",
     :order_book => "i5", 
     :market_capitalization => "j1",
     :market_cap_realtime => "j3", 
     :ebitda => "j4",
     :change_From_52_week_low => "j5",
     :percent_change_from_52_week_low => "j6",
     :last_trade_realtime_withtime => "k1",
     :change_percent_realtime => "k2",
     :last_trade_size => "k3",
     :change_from_52_week_high => "k4",
     :percent_change_from_52_week_high => "k5",
     :last_trade_with_time => "l",
     :last_trade_price => "l1",
     :close => "l1",
     :high_limit => "l2",
     :low_limit => "l3",
     :days_range => "m",
     :days_range_realtime => "m2",
     :moving_average_50_day => "m3",
     :moving_average_200_day => "m4",
     :change_from_200_day_moving_average => "m5",
     :percent_change_from_200_day_moving_average => "m6",
     :change_from_50_day_moving_average => "m7",
     :percent_change_from_50_day_moving_average => "m8",
     :name => "n",
     :notes => "n4",
     :open => "o",
     :previous_close => "p",
     :price_paid => "p1",
     :change_in_percent => "p2",
     :price_per_sales => "p5",
     :price_per_book => "p6",
     :ex_dividend_date => "q",
     :pe_ratio => "p5",
     :dividend_pay_date => "r1",
     :pe_ratio_realtime => "r2",
     :peg_ratio => "r5",
     :price_eps_estimate_current_year => "r6",
     :price_eps_Estimate_next_year => "r7",
     :symbol => "s",
     :shares_owned => "s1",
     :short_ratio => "s7",
     :last_trade_time => "t1",
     :trade_links => "t6",
     :ticker_trend => "t7",
     :one_year_target_price => "t8",
     :volume => "v",
     :holdings_value => "v1",
     :holdings_value_realtime => "v7",
     :weeks_range_52 => "w",
     :day_value_change => "w1",
     :day_value_change_realtime => "w4",
     :stock_exchange => "x",
     :dividend_yield => "y",
     :adjusted_close => nil # this one only comes in historical quotes
  }
  
  HISTORICAL_MODES = {
    :daily => "d",
    :weekly => "w",
    :monthly => "m",
    :dividends_only => "v"
  }

  SYMBOLS_PER_REQUEST = 50

  # retrieve the quote data (an OpenStruct per quote)
  # the options param can be used to specify the following attributes:
  # :raw - if true, each column will be converted (to numbers, dates, etc)
  def self.quotes(symbols_array, columns_array = [:symbol, :last_trade_price, :last_trade_date, :change, :previous_close], options = { })
    options[:raw] ||= true
    ret = []
    symbols_array.each_slice(SYMBOLS_PER_REQUEST) do |symbols|
      read_symbols(symbols.join("+"), columns_array).map do |row|
        ret << OpenStruct.new(row.to_hash)
      end
    end
    ret
  end
  
  def self.historical_quotes(symbol, start_date, end_date, options = {})
    options[:raw] ||= true
    options[:period] ||= :daily
    read_historical(symbol, start_date, end_date, options).map do |row|
      OpenStruct.new(row.to_hash.merge(:symbol => symbol))
    end
  end
  
  private
  
  def self.read_symbols(symb_str, cols)
     columns = "#{cols.map {|col| COLUMNS[col] }.join('')}"
     conn = open("http://finance.yahoo.com/d/quotes.csv?s=#{URI.escape(symb_str)}&f=#{columns}")
     CSV.parse(conn.read, :headers => cols)
  end

  def self.read_historical(symbol, start_date, end_date, options)
     url = "http://ichart.finance.yahoo.com/table.csv?s=#{URI.escape(symbol)}&d=#{end_date.month-1}&e=#{end_date.day}&f=#{end_date.year}&g=#{HISTORICAL_MODES[options[:period]]}&a=#{start_date.month-1}&b=#{start_date.day}&c=#{start_date.year}&ignore=.csv"
     conn = open(url)
     cols =
       if options[:period] == :dividends_only
         [:dividend_pay_date, :dividend_yield]
       else
         [:trade_date, :open, :high, :low, :close, :volume, :adjusted_close]
       end
     result = CSV.parse(conn.read, :headers => cols) #:first_row, :header_converters => :symbol)
     result.delete(0)  # drop returned header
     result
  end

 end