feat(zadd): add ZAddLT and ZAddGT (#2429)

Co-authored-by: Vladimir Mihailenco <vladimir.webdev@gmail.com>

commands.go

@@ -302,6 +302,8 @@ type Cmdable interface {
 	BZMPop(ctx context.Context, timeout time.Duration, order string, count int64, keys ...string) *ZSliceWithKeyCmd
 
 	ZAdd(ctx context.Context, key string, members ...Z) *IntCmd
+	ZAddLT(ctx context.Context, key string, members ...Z) *IntCmd
+	ZAddGT(ctx context.Context, key string, members ...Z) *IntCmd
 	ZAddNX(ctx context.Context, key string, members ...Z) *IntCmd
 	ZAddXX(ctx context.Context, key string, members ...Z) *IntCmd
 	ZAddArgs(ctx context.Context, key string, args ZAddArgs) *IntCmd
@@ -2408,6 +2410,22 @@ func (c cmdable) ZAdd(ctx context.Context, key string, members ...Z) *IntCmd {
 	})
 }
 
+// ZAddLT Redis `ZADD key LT score member [score member ...]` command.
+func (c cmdable) ZAddLT(ctx context.Context, key string, members ...Z) *IntCmd {
+	return c.ZAddArgs(ctx, key, ZAddArgs{
+		LT:      true,
+		Members: members,
+	})
+}
+
+// ZAddGT Redis `ZADD key GT score member [score member ...]` command.
+func (c cmdable) ZAddGT(ctx context.Context, key string, members ...Z) *IntCmd {
+	return c.ZAddArgs(ctx, key, ZAddArgs{
+		GT:      true,
+		Members: members,
+	})
+}
+
 // ZAddNX Redis `ZADD key NX score member [score member ...]` command.
 func (c cmdable) ZAddNX(ctx context.Context, key string, members ...Z) *IntCmd {
 	return c.ZAddArgs(ctx, key, ZAddArgs{

commands_test.go

@@ -3407,6 +3407,76 @@ var _ = Describe("Commands", func() {
 			Expect(vals).To(Equal([]redis.Z{{Score: 1, Member: "one"}}))
 		})
 
+		It("should ZAddArgsLT", func() {
+			added, err := client.ZAddLT(ctx, "zset", redis.Z{
+				Score:  2,
+				Member: "one",
+			}).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(added).To(Equal(int64(1)))
+
+			vals, err := client.ZRangeWithScores(ctx, "zset", 0, -1).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(vals).To(Equal([]redis.Z{{Score: 2, Member: "one"}}))
+
+			added, err = client.ZAddLT(ctx, "zset", redis.Z{
+				Score:  3,
+				Member: "one",
+			}).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(added).To(Equal(int64(0)))
+
+			vals, err = client.ZRangeWithScores(ctx, "zset", 0, -1).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(vals).To(Equal([]redis.Z{{Score: 2, Member: "one"}}))
+
+			added, err = client.ZAddLT(ctx, "zset", redis.Z{
+				Score:  1,
+				Member: "one",
+			}).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(added).To(Equal(int64(0)))
+
+			vals, err = client.ZRangeWithScores(ctx, "zset", 0, -1).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(vals).To(Equal([]redis.Z{{Score: 1, Member: "one"}}))
+		})
+
+		It("should ZAddArgsGT", func() {
+			added, err := client.ZAddGT(ctx, "zset", redis.Z{
+				Score:  2,
+				Member: "one",
+			}).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(added).To(Equal(int64(1)))
+
+			vals, err := client.ZRangeWithScores(ctx, "zset", 0, -1).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(vals).To(Equal([]redis.Z{{Score: 2, Member: "one"}}))
+
+			added, err = client.ZAddGT(ctx, "zset", redis.Z{
+				Score:  3,
+				Member: "one",
+			}).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(added).To(Equal(int64(0)))
+
+			vals, err = client.ZRangeWithScores(ctx, "zset", 0, -1).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(vals).To(Equal([]redis.Z{{Score: 3, Member: "one"}}))
+
+			added, err = client.ZAddGT(ctx, "zset", redis.Z{
+				Score:  1,
+				Member: "one",
+			}).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(added).To(Equal(int64(0)))
+
+			vals, err = client.ZRangeWithScores(ctx, "zset", 0, -1).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(vals).To(Equal([]redis.Z{{Score: 3, Member: "one"}}))
+		})
+
 		It("should ZAddArgsNX", func() {
 			added, err := client.ZAddNX(ctx, "zset", redis.Z{
 				Score:  1,