Add map_link_url method to all supported Lookups.

lib/geocoder/lookups/base.rb

@@ -39,6 +39,16 @@ module Geocoder
         results(query, reverse).map{ |r| result_class.new(r) }
       end
 
+      ##
+      # Return the URL for a map of the given coordinates.
+      #
+      # Not necessarily implemented by all subclasses as only some lookups
+      # also provide maps.
+      #
+      def map_link_url(coordinates)
+        nil
+      end
+
 
       private # -------------------------------------------------------------
 

lib/geocoder/lookups/bing.rb

@@ -4,6 +4,10 @@ require "geocoder/results/bing"
 module Geocoder::Lookup
   class Bing < Base
 
+    def map_link_url(coordinates)
+      "http://www.bing.com/maps/default.aspx?cp=#{coordinates.join('~')}"
+    end
+
     private # ---------------------------------------------------------------
 
     def results(query, reverse = false)

lib/geocoder/lookups/google.rb

@@ -4,6 +4,10 @@ require "geocoder/results/google"
 module Geocoder::Lookup
   class Google < Base
 
+    def map_link_url(coordinates)
+      "http://maps.google.com/maps?q=#{coordinates.join(',')}"
+    end
+
     private # ---------------------------------------------------------------
 
     def results(query, reverse = false)

lib/geocoder/lookups/yahoo.rb

@@ -4,6 +4,10 @@ require "geocoder/results/yahoo"
 module Geocoder::Lookup
   class Yahoo < Base
 
+    def map_link_url(coordinates)
+      "http://maps.yahoo.com/#lat=#{coordinates[0]}&lon=#{coordinates[1]}"
+    end
+
     private # ---------------------------------------------------------------
 
     def results(query, reverse = false)

lib/geocoder/lookups/yandex.rb

@@ -4,6 +4,10 @@ require "geocoder/results/yandex"
 module Geocoder::Lookup
   class Yandex < Base
 
+    def map_link_url(coordinates)
+      "http://maps.yandex.ru/?ll=#{coordinates.reverse.join(',')}"
+    end
+
     private # ---------------------------------------------------------------
 
     def results(query, reverse = false)