Check for black Mini 9's at the Dell Outlet

mini9watch.rb

#!/usr/bin/env ruby
require 'pp'
require 'rubygems'
require 'mechanize'
require 'nokogiri'

PRICE_THRESHOLD = 200
EMAIL_ALERT = ''         # e-mail address to send alerts to 
CELL_MAPPINGS = {
  2 => 'ID',
  4 => 'Price',
  5 => 'Model',
  6 => 'Color',
  8 => 'OS',
  9 => 'Screen Size',
  10 => 'HDD',
  11 => 'Memory',
  16 => 'Wireless'
}

a = WWW::Mechanize.new do |agent|
  agent.user_agent_alias = 'Mac Safari'
end

a.get('http://outlet.us.dell.com/ARBOnlineSales/topics/global.aspx/arb/online/en/InventorySearch?c=us&cs=22&l=en&lob=INSP&MODEL_DESC=Inspiron%20Mini%209%20-%20910&s=dfh') do |page|
  search_result = page.form_with(:name => 'thisForm') do |search|
    search.SYSTEM_COLOR = 'Obsidian Black'
  end.submit

  # Write the result to an HTML file for debugging
  File.open("page.html", "w+") do |f|
    f.puts search_result.body
  end

  # Parse the output
  doc = Nokogiri::HTML(search_result.body)

  results = []
  doc.css('table.tblLayout tr').each do |row|
    result = {}
    row.css("td").each_with_index do |cell, i|
      result[CELL_MAPPINGS[i]] = cell.content if CELL_MAPPINGS[i]
    end
  
    results << result if result != {} && result['Price'] != "Model"
  end

  # Sort by price, and clean up the Output a bit
  below_threshold = []
  results.sort_by {|result| result['Price'][1, 10].to_f }.each do |result|
    output = "%s - %s, %s, %s, %s" % [result['ID'].gsub('View Details', ''), result['Price'], result['OS'].gsub('Genuine Windows ', ''), result['Memory'], result['HDD'].gsub(' Solid State Drive', '')]
    puts output

    if result['Price'][1, 10].to_f < PRICE_THRESHOLD
      below_threshold << output
    end  
    
  end
  
  if below_threshold != []
    File.open('/tmp/deals', 'w+') do |f|
      f.puts below_threshold.join("\n")
    end
  
    system("cat /tmp/deals | sendmail #{EMAIL_ALERT}")
  end
end

output

ZR7D0TJW - $309.00, XP Home, 512, 8 GB
Z2RYV565 - $309.00, XP Home, 1000, 8 GB
FXDFC365 - $309.00, XP Home, 512, 8 GB
0GV04CDW - $309.00, XP Home, 512, 8 GB
FX95JW65 - $309.00, XP Home, 1000, 8 GB
E6R28WT0 - $309.00, XP Home, 512, 8 GB
FXEEZR65 - $309.00, XP Home, 512, 8 GB
DDALAX15 - $379.00, XP Home, 1000, 8 GB
ZRBAKD8W - $379.00, XP Home, 512, 8 GB