From: m4dc4p <jgbailey@...>
Date: 2005-10-07T09:31:49+09:00
Subject: Google Calculator command line tool

I whipped a quick script to send queries to Google and scrape results
if it's a valid "calculator" query. If you don't know what I mean, put
"5 + 5" into the Google search box. I love the feature but hate having
to open a web browser each time I want to use it. Thus, this script!

I'm pretty much a n00b to Ruby so any feedback, improvements, comments
are appreciated. Enjoy!

--- cut here ---
require 'net/http'
require 'cgi'

format_result = Proc.new { |s|
  s.gsub("<font size=-2>
</font>",",").gsub("&#215;","x").gsub("<sup>","^").gsub("</sup>", "")
}

matchExp = Regexp.new("<td><img
src=/images/calc_img.gif></td><td>&nbsp;</td><td nowrap>(.*?) =
(.*?)</b>")
while  ((! (print "Enter an expression (exit to quit): "; line =
gets).nil?) && line.strip.upcase != "EXIT")
  resp =
Net::HTTP.get_response(URI.parse("http://www.google.com/search?q=#{CGI.escape(line.strip)}"))
  if resp.code == "200"
    begin
      matches = matchExp.match(resp.body)
      puts "==>" + format_result.call(matches[2])
    rescue NoMethodError
      puts "==> Expression not understood."
    rescue
      puts "==> Expression not understood. (#{$!.class.inspect},
#{$!.inspect})"
    end
  else 
    puts "==> Response error: #{resp.code}"
  end
end