Support for multi keys in Exists

commands.go

@@ -50,6 +50,8 @@ type Cmdable interface {
 	Unlink(keys ...string) *IntCmd
 	Dump(key string) *StringCmd
 	Exists(key string) *BoolCmd
+	// TODO: merge with Exists in v6
+	ExistsMulti(keys ...string) *IntCmd
 	Expire(key string, expiration time.Duration) *BoolCmd
 	ExpireAt(key string, tm time.Time) *BoolCmd
 	Keys(pattern string) *StringSliceCmd
@@ -317,6 +319,17 @@ func (c *cmdable) Exists(key string) *BoolCmd {
 	return cmd
 }
 
+func (c *cmdable) ExistsMulti(keys ...string) *IntCmd {
+	args := make([]interface{}, 1+len(keys))
+	args[0] = "exists"
+	for i, key := range keys {
+		args[1+i] = key
+	}
+	cmd := NewIntCmd(args...)
+	c.process(cmd)
+	return cmd
+}
+
 func (c *cmdable) Expire(key string, expiration time.Duration) *BoolCmd {
 	cmd := NewBoolCmd("expire", key, formatSec(expiration))
 	c.process(cmd)

commands_test.go

@@ -242,6 +242,14 @@ var _ = Describe("Commands", func() {
 			exists = client.Exists("key2")
 			Expect(exists.Err()).NotTo(HaveOccurred())
 			Expect(exists.Val()).To(Equal(false))
+
+			existsMul  := client.ExistsMulti("key1", "key2")
+			Expect(existsMul.Err()).NotTo(HaveOccurred())
+			Expect(existsMul.Val()).To(Equal(int64(1)))
+
+			existsMul  = client.ExistsMulti("key1", "key1")
+			Expect(existsMul.Err()).NotTo(HaveOccurred())
+			Expect(existsMul.Val()).To(Equal(int64(2)))
 		})
 
 		It("should Expire", func() {