add googlebot_mobile user agent

lib/user_agent.rb

@@ -56,7 +56,7 @@ def initialize(product, version=nil, comment=nil)
     else
       raise ArgumentError, "expected a value for product"
     end
-
+    
     if version && !version.empty?
       @version = version
     else

lib/user_agent/browsers.rb

@@ -4,6 +4,7 @@
 require 'user_agent/browsers/internet_explorer'
 require 'user_agent/browsers/webkit'
 require 'user_agent/browsers/googlebot'
+require 'user_agent/browsers/googlebot_mobile'
 require 'user_agent/browsers/gecko'
 
 class UserAgent
@@ -18,7 +19,8 @@ module Browsers
     def self.all
       # Opera must be checked before Firefox due to the odd user agents used in some older versions of Opera
       # Googlebot must be checked before Gecko because 2.1 uses Mozilla as user-agent
-      [Other, Opera, InternetExplorer, Webkit, Googlebot, Gecko]
+      # Googlebot mobile must be checked before Webkit and Googlebot
+      [Other, Opera, InternetExplorer, GooglebotMobile, Webkit, Googlebot, Gecko]
     end
 
     def self.extend(array)

lib/user_agent/browsers/googlebot_mobile.rb

@@ -0,0 +1,37 @@
+class UserAgent
+  module Browsers
+    module GooglebotMobile
+      def self.extend?(agent)
+        agent.detect_user_agent_by_product_or_comment('Googlebot-Mobile')
+      end
+
+      def browser
+        "Googlebot-Mobile"
+      end
+
+      def version
+        (application.product == 'Safari' &&
+         application.comment &&
+         application.comment[1]) ? 
+         application.comment[1].sub("Googlebot-Mobile/", "") :
+         application.version.sub(';', '')
+      end
+
+      def compatibility
+        application.comment ? application.comment[0] : nil
+      end
+
+      def compatible?
+        compatibility == "compatible"
+      end
+
+      def crawler?
+        true
+      end
+
+      def mobile?
+        true
+      end
+    end
+  end
+end

spec/user_agent/browsers/googlebot_mobile_spec.rb

@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe UserAgent::Browsers::GooglebotMobile do
+
+  describe "Googlebot-Mobile" do
+    it { "Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7 (compatible; Googlebot-Mobile/2.1; +http://www.google.com/bot.html)".
+      should be_browser("Googlebot-Mobile").
+      platform('iPhone').
+      security(:strong).
+      webkit_version('532.9').
+      build('532.9').
+      language('en-US').
+      compatible(true).
+      version("2.1").
+      crawler(true).
+      mobile(true) }
+    it { "Googlebot-Mobile/2.1; +http://www.google.com/bot.html".should be_browser("Googlebot-Mobile").version("2.1").crawler(true).mobile(true) }
+  end
+
+end
+