Add basic BITFIELD support

commands.go

@@ -98,6 +98,7 @@ type Cmdable interface {
 	BitOpXor(destKey string, keys ...string) *IntCmd
 	BitOpNot(destKey string, key string) *IntCmd
 	BitPos(key string, bit int64, pos ...int64) *IntCmd
+	BitField(key string, args ...interface{}) *IntSliceCmd
 	Decr(key string) *IntCmd
 	DecrBy(key string, decrement int64) *IntCmd
 	Get(key string) *StringCmd
@@ -724,6 +725,16 @@ func (c cmdable) BitPos(key string, bit int64, pos ...int64) *IntCmd {
 	return cmd
 }
 
+func (c cmdable) BitField(key string, args ...interface{}) *IntSliceCmd {
+	a := make([]interface{}, 0, 2+len(args))
+	a = append(a, "bitfield")
+	a = append(a, key)
+	a = append(a, args...)
+	cmd := NewIntSliceCmd(a...)
+	c(cmd)
+	return cmd
+}
+
 func (c cmdable) Decr(key string) *IntCmd {
 	cmd := NewIntCmd("decr", key)
 	c(cmd)

commands_test.go

@@ -968,6 +968,12 @@ var _ = Describe("Commands", func() {
 			Expect(pos).To(Equal(int64(-1)))
 		})
 
+		It("should BitField", func() {
+			nn, err := client.BitField("mykey", "INCRBY", "i5", 100, 1, "GET", "u4", 0).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(nn).To(Equal([]int64{1, 0}))
+		})
+
 		It("should Decr", func() {
 			set := client.Set("key", "10", 0)
 			Expect(set.Err()).NotTo(HaveOccurred())