Add geohash command

Author: TheSmartnik

lib/redis.rb

@@ -2721,6 +2721,18 @@ def geoadd(key, *member)
     end
   end
 
+  # Returns geohash string representing position for specified members of the specified key.
+  #
+  # @param [String] key
+  # @param [String, Array<String>] member one member or array of members
+  # @return [Array<String, nil>] returns array containg geohash string if member is present, nil otherwise
+  def geohash(key, member)
+    synchronize do |client|
+      client.call([:geohash, key, member])
+    end
+  end
+
+
   # Query a sorted set representing a geospatial index to fetch members matching a
   # given maximum distance from a point
   #

test/commands_on_geo_test.rb

@@ -74,4 +74,17 @@ def test_geodist_with_nonexistant_location
     distination = r.geodist("Sicily", "Palermo", "Rome")
     assert_equal nil, distination
   end
+
+  def test_geohash
+    geohash = r.geohash("Sicily", "Palermo")
+    assert_equal ["sqc8b49rny0"], geohash
+
+    geohashes = r.geohash("Sicily", ["Palermo", "Catania"])
+    assert_equal %w(sqc8b49rny0 sqdtr74hyu0), geohashes
+  end
+
+  def test_geohash_with_nonexistant_location
+    geohashes = r.geohash("Sicily", ["Palermo", "Rome"])
+    assert_equal ["sqc8b49rny0", nil], geohashes
+  end
 end