Handle redis-rb 3.0 API for zrevrange with scores.

lib/redness/red.rb

@@ -7,6 +7,10 @@ def self.redis
     $redis
   end
 
+  def self.client_version
+    @version ||= Redis::VERSION.scan(/\d+/).map { |s| s.to_i }
+  end
+
   def self.delete(key)
     redis.del(key)
   end

lib/redness/red_set.rb

@@ -45,8 +45,14 @@ def self.get(key, options = {})
       results = redis.zrevrange(key, lower_bound, upper_bound, :with_scores => with_scores)
       if with_scores
         [].tap do |memo|
-          results.each_slice(2) do |slice|
-            memo << [slice[0].to_i, scoring.call(slice[1].to_i)]
+          if Red.client_version.first < 3
+            results.each_slice(2) do |slice|
+              memo << [slice[0].to_i, scoring.call(slice[1].to_i)]
+            end
+          else
+            results.each do |member, score|
+              memo << [member.to_i, scoring.call(score)]
+            end
           end
         end
       else

spec/redness/red_set_spec.rb

@@ -98,14 +98,28 @@
   end
 
   describe ".get" do
-    describe "pagination" do
-      it "should return results bounded by provided options" do
-        RedSet.add("somekey", 1)
-        RedSet.add("somekey", 2)
-
-        RedSet.get("somekey", :lower => 0, :upper => 0).should == [2]
-        RedSet.get("somekey", :lower => 1, :upper => 1).should == [1]
-      end
+    it "should return the elements in reverse-inserted order" do
+      RedSet.add('somekey', 1)
+      RedSet.add('somekey', 2)
+      RedSet.add('somekey', 3)
+
+      RedSet.get('somekey').should == [3, 2, 1]
+    end
+
+    it "should pair the elements with their scores if :with_scores is true" do
+      RedSet.add('somekey', 1)
+      RedSet.add('somekey', 2)
+      RedSet.add('somekey', 3)
+
+      RedSet.get('somekey', :with_scores => true).should == [[3, 2], [2, 1], [1, 0]]
+    end
+
+    it "should return results bounded by provided pagination options" do
+      RedSet.add("somekey", 1)
+      RedSet.add("somekey", 2)
+
+      RedSet.get("somekey", :lower => 0, :upper => 0).should == [2]
+      RedSet.get("somekey", :lower => 1, :upper => 1).should == [1]
     end
   end