options-lib

Options-Lib

A set of classes for dealing with options. It includes a crawler for Yahoo!Finance. The crawler has an internal thread that can be started to periodically update the option quotes.

Install

gem install options-lib

Usage

require 'options-lib'

# Create a crawler for all the options for ('AAPL') expiring on '2013-01-18'
y = YahooCrawler.new('AAPL', '2013-01-18')

# Fetch the entire options chain for this stock and expiration
y.fetch

# Show an option quote for a given strike price
y.call_options[300] # => AAPL_C300_18JAN2013: bid => 88.5, ask => 90.5
y.put_options[300] # => AAPL_P300_18JAN2013: bid => 40.7, ask => 41.95

# Options quote has stock price, bid and ask for option
q = y.call_options[300]
q.stock_price # => 342.88
q.bid # => 88.5
q.ask # => 90.5

# Crawler also has current stock price, as each option quote
y.stock_price # => 342.88

# You can get a list of all stock prices from the crawler
y.call_strikes # => [135.0, 140.0, ..., 530.0, 540.0]
y.put_strikes # => [135.0, 140.0, ..., 530.0, 540.0]

# So to print the entire options chain, you can do something like that
y.call_strikes.each { |strike| puts y.call_options[strike] }
y.put_strikes.each { |strike| puts y.put_options[strike] }	

# you can place the crawler in auto_reload mode, passing a period to refresh itself
y.auto_reload 5
y.call_options[300].bid # => 88.5
sleep 6
y.call_options[300].bid # => 90.3

# you can also receive callbacks from the internal thread when the crawler gets updated
y.auto_reload(5) do
  puts "Current bid: #{y.call_options[300].bid}"
end

# if you need to block ruby from exiting while your thread is executing in the background
# you can use the method below
y.join_reload_thread

# internal symbol versus real symbol
y.internal_symbol # => AAPL_C300_18JAN2013
y.symbol # => AAPL130119C00300000