A simple bot for tweeting OGE's daily price signal

tweet_oge_price_signal.rb

require "rest_client"
require "twitter"

URL     = "http://www.oge.com/residential-customers/products-and-services/" +
          "Positive-Energy-Smart-Grid/Pages/PriceSignal.aspx"
DATE_RE = Time.now.strftime("%A,\\s+%B\\s+%d,\\s+%Y")

unless ARGV.size == 4
  abort "USAGE:  #{$PROGRAM_NAME} CONSUMER_KEY CONSUMER_SECRET " +
                                 "OAUTH_TOKEN OAUTH_TOKEN_SECRET"
end

# fetch the pricing page
pricing_html = RestClient.post(URL, "SelectedPlanField" => "ResidentialVpp")

prices = { }
# find peak and off-peak pricing
price_row = pricing_html[ %r{ <div\b(?=[^>]*\bclass="PriceRow")[^>]*>
                                \s*
                                <div\b(?=[^>]*\bclass="PriceDate")[^>]*>
                                  #{DATE_RE}
                                </div>
                                (?<div> (?: [^<]++ |
                                            <div[^>]*+> \g<div> </div> )+ )
                              </div> }x ]
price_row.scan( %r{ <div\b(?=[^>]*\bclass="PriceLabel")[^>]*>([^<]+)</div>
                    \s*
                    <div\b(?=[^>]*\bclass="Price")[^>]*>([^<]+)</div> }x ) do
  prices[$1] = $2
end

# find any critical events
pricing_html.scan( %r{ <div\b(?=[^>]*\bclass="EventLabel")[^>]*>
                         Critical\s+Price\s+Event
                       </div>
                       \s*
                       <div\b(?=[^>]*\bclass="EventDate")[^>]*>
                         #{DATE_RE}
                       </div>
                       \s*
                       <div\b(?=[^>]*\bclass="EventTime")[^>]*>
                         ([^<]+)
                       </div>
                       \s*
                       <div\b(?=[^>]*\bclass="Price")[^>]*>
                         ([^<]+) }x ) do
  prices[$1] = $2
end

# send a tweet
Twitter.configure do |config|
  config.consumer_key       = ARGV[0]
  config.consumer_secret    = ARGV[1]
  config.oauth_token        = ARGV[2]
  config.oauth_token_secret = ARGV[3]
end
tweet = "Today's OGE Price Signal: " +
        prices.map { |time, price| "#{time}: #{price}" }.join(", ")
Twitter.update(tweet)