feat(cmd): support for adding byte,bit parameters to the bitpos command (redis#2498)

Signed-off-by: monkey92t <golang@88.com>

Author: monkey92t

commands.go

@@ -194,6 +194,7 @@ type Cmdable interface {
 	BitOpXor(ctx context.Context, destKey string, keys ...string) *IntCmd
 	BitOpNot(ctx context.Context, destKey string, key string) *IntCmd
 	BitPos(ctx context.Context, key string, bit int64, pos ...int64) *IntCmd
+	BitPosSpan(ctx context.Context, key string, bit int8, start, end int64, span string) *IntCmd
 	BitField(ctx context.Context, key string, args ...interface{}) *IntSliceCmd
 
 	Scan(ctx context.Context, cursor uint64, match string, count int64) *ScanCmd
@@ -1211,6 +1212,8 @@ func (c cmdable) BitOpNot(ctx context.Context, destKey string, key string) *IntC
 	return c.bitOp(ctx, "not", destKey, key)
 }
 
+// BitPos is an API before Redis version 7.0, cmd: bitpos key bit start end
+// if you need the `byte | bit` parameter, please use `BitPosSpan`.
 func (c cmdable) BitPos(ctx context.Context, key string, bit int64, pos ...int64) *IntCmd {
 	args := make([]interface{}, 3+len(pos))
 	args[0] = "bitpos"
@@ -1231,6 +1234,18 @@ func (c cmdable) BitPos(ctx context.Context, key string, bit int64, pos ...int64
 	return cmd
 }
 
+// BitPosSpan supports the `byte | bit` parameters in redis version 7.0,
+// the bitpos command defaults to using byte type for the `start-end` range,
+// which means it counts in bytes from start to end. you can set the value
+// of "span" to determine the type of `start-end`.
+// span = "bit", cmd: bitpos key bit start end bit
+// span = "byte", cmd: bitpos key bit start end byte
+func (c cmdable) BitPosSpan(ctx context.Context, key string, bit int8, start, end int64, span string) *IntCmd {
+	cmd := NewIntCmd(ctx, "bitpos", key, bit, start, end, span)
+	_ = c(ctx, cmd)
+	return cmd
+}
+
 func (c cmdable) BitField(ctx context.Context, key string, args ...interface{}) *IntSliceCmd {
 	a := make([]interface{}, 0, 2+len(args))
 	a = append(a, "bitfield")

commands_test.go

@@ -1091,6 +1091,19 @@ var _ = Describe("Commands", func() {
 			Expect(pos).To(Equal(int64(-1)))
 		})
 
+		It("should BitPosSpan", func() {
+			err := client.Set(ctx, "mykey", "\x00\xff\x00", 0).Err()
+			Expect(err).NotTo(HaveOccurred())
+
+			pos, err := client.BitPosSpan(ctx, "mykey", 0, 1, 3, "byte").Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(pos).To(Equal(int64(16)))
+
+			pos, err = client.BitPosSpan(ctx, "mykey", 0, 1, 3, "bit").Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(pos).To(Equal(int64(1)))
+		})
+
 		It("should BitField", func() {
 			nn, err := client.BitField(ctx, "mykey", "INCRBY", "i5", 100, 1, "GET", "u4", 0).Result()
 			Expect(err).NotTo(HaveOccurred())