feat: add zintercard cmd

commands.go

@@ -268,6 +268,7 @@ type Cmdable interface {
 	ZIncrBy(ctx context.Context, key string, increment float64, member string) *FloatCmd
 	ZInter(ctx context.Context, store *ZStore) *StringSliceCmd
 	ZInterWithScores(ctx context.Context, store *ZStore) *ZSliceCmd
+	ZInterCard(ctx context.Context, limit int64, keys ...string) *IntCmd
 	ZInterStore(ctx context.Context, destination string, store *ZStore) *IntCmd
 	ZMScore(ctx context.Context, key string, members ...string) *FloatSliceCmd
 	ZPopMax(ctx context.Context, key string, count ...int64) *ZSliceCmd
@@ -2346,6 +2347,22 @@ func (c cmdable) ZInterWithScores(ctx context.Context, store *ZStore) *ZSliceCmd
 	return cmd
 }
 
+func (c cmdable) ZInterCard(ctx context.Context, limit int64, keys ...string) *IntCmd {
+	args := make([]interface{}, 4+len(keys))
+	args[0] = "zintercard"
+	numkeys := int64(0)
+	for i, key := range keys {
+		args[2+i] = key
+		numkeys++
+	}
+	args[1] = numkeys
+	args[2+numkeys] = "limit"
+	args[3+numkeys] = limit
+	cmd := NewIntCmd(ctx, args...)
+	_ = c(ctx, cmd)
+	return cmd
+}
+
 func (c cmdable) ZMScore(ctx context.Context, key string, members ...string) *FloatSliceCmd {
 	args := make([]interface{}, 2+len(members))
 	args[0] = "zmscore"

commands_test.go

@@ -4353,6 +4353,32 @@ var _ = Describe("Commands", func() {
 			Expect(v).To(Equal([]string{"one", "two"}))
 		})
 
+		It("should ZInterCard", func() {
+			err := client.ZAdd(ctx, "zset1", redis.Z{Score: 1, Member: "one"}).Err()
+			Expect(err).NotTo(HaveOccurred())
+			err = client.ZAdd(ctx, "zset1", redis.Z{Score: 2, Member: "two"}).Err()
+			Expect(err).NotTo(HaveOccurred())
+			err = client.ZAdd(ctx, "zset2", redis.Z{Score: 1, Member: "one"}).Err()
+			Expect(err).NotTo(HaveOccurred())
+			err = client.ZAdd(ctx, "zset2", redis.Z{Score: 2, Member: "two"}).Err()
+			Expect(err).NotTo(HaveOccurred())
+			err = client.ZAdd(ctx, "zset2", redis.Z{Score: 3, Member: "three"}).Err()
+			Expect(err).NotTo(HaveOccurred())
+
+			// limit 0 means no limit
+			sInterCard := client.ZInterCard(ctx, 0, "zset1", "zset2")
+			Expect(sInterCard.Err()).NotTo(HaveOccurred())
+			Expect(sInterCard.Val()).To(Equal(int64(2)))
+
+			sInterCard = client.ZInterCard(ctx, 1, "zset1", "zset2")
+			Expect(sInterCard.Err()).NotTo(HaveOccurred())
+			Expect(sInterCard.Val()).To(Equal(int64(1)))
+
+			sInterCard = client.ZInterCard(ctx, 3, "zset1", "zset2")
+			Expect(sInterCard.Err()).NotTo(HaveOccurred())
+			Expect(sInterCard.Val()).To(Equal(int64(2)))
+		})
+
 		It("should ZInterWithScores", func() {
 			err := client.ZAdd(ctx, "zset1", redis.Z{Score: 1, Member: "one"}).Err()
 			Expect(err).NotTo(HaveOccurred())