Add LPOS command (#1556)

* Add LPos

.github/workflows/go.yml

@@ -0,0 +1,50 @@
+name: Go
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    services:
+      # Label used to access the service container
+      redis:
+        # Docker Hub image
+        image: redis
+        # Set health checks to wait until redis has started
+        options: >-
+          --health-cmd "redis-cli ping"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          # Maps port 6379 on service container to the host
+          - 6379:6379
+    steps:
+
+      - name: Set up Go 1.x
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.14
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Get dependencies
+        run: |
+          go get -v -t -d ./...
+          if [ -f Gopkg.toml ]; then
+              curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
+              dep ensure
+          fi
+      - name: Install golangci
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.31.0
+      - name: Test
+        run: make

commands.go

@@ -168,6 +168,8 @@ type Cmdable interface {
 	LInsertAfter(ctx context.Context, key string, pivot, value interface{}) *IntCmd
 	LLen(ctx context.Context, key string) *IntCmd
 	LPop(ctx context.Context, key string) *StringCmd
+	LPos(ctx context.Context, key string, value string, args LPosArgs) *IntCmd
+	LPosCount(ctx context.Context, key string, value string, count int64, args LPosArgs) *IntSliceCmd
 	LPush(ctx context.Context, key string, values ...interface{}) *IntCmd
 	LPushX(ctx context.Context, key string, values ...interface{}) *IntCmd
 	LRange(ctx context.Context, key string, start, stop int64) *StringSliceCmd
@@ -1188,6 +1190,37 @@ func (c cmdable) LPop(ctx context.Context, key string) *StringCmd {
 	return cmd
 }
 
+type LPosArgs struct {
+	Rank, MaxLen int64
+}
+
+func (c cmdable) LPos(ctx context.Context, key string, value string, a LPosArgs) *IntCmd {
+	args := []interface{}{"lpos", key, value}
+	if a.Rank != 0 {
+		args = append(args, "rank", a.Rank)
+	}
+	if a.MaxLen != 0 {
+		args = append(args, "maxlen", a.MaxLen)
+	}
+
+	cmd := NewIntCmd(ctx, args...)
+	_ = c(ctx, cmd)
+	return cmd
+}
+
+func (c cmdable) LPosCount(ctx context.Context, key string, value string, count int64, a LPosArgs) *IntSliceCmd {
+	args := []interface{}{"lpos", key, value, "count", count}
+	if a.Rank != 0 {
+		args = append(args, "rank", a.Rank)
+	}
+	if a.MaxLen != 0 {
+		args = append(args, "maxlen", a.MaxLen)
+	}
+	cmd := NewIntSliceCmd(ctx, args...)
+	_ = c(ctx, cmd)
+	return cmd
+}
+
 func (c cmdable) LPush(ctx context.Context, key string, values ...interface{}) *IntCmd {
 	args := make([]interface{}, 2, 2+len(values))
 	args[0] = "lpush"

commands_test.go

@@ -1691,6 +1691,62 @@ var _ = Describe("Commands", func() {
 			Expect(lRange.Val()).To(Equal([]string{"two", "three"}))
 		})
 
+		It("should LPos", func() {
+			rPush := client.RPush(ctx, "list", "a")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+			rPush = client.RPush(ctx, "list", "b")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+			rPush = client.RPush(ctx, "list", "c")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+			rPush = client.RPush(ctx, "list", "b")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+
+			lPos := client.LPos(ctx, "list", "b", redis.LPosArgs{})
+			Expect(lPos.Err()).NotTo(HaveOccurred())
+			Expect(lPos.Val()).To(Equal(int64(1)))
+
+			lPos = client.LPos(ctx, "list", "b", redis.LPosArgs{Rank: 2})
+			Expect(lPos.Err()).NotTo(HaveOccurred())
+			Expect(lPos.Val()).To(Equal(int64(3)))
+
+			lPos = client.LPos(ctx, "list", "b", redis.LPosArgs{Rank: -2})
+			Expect(lPos.Err()).NotTo(HaveOccurred())
+			Expect(lPos.Val()).To(Equal(int64(1)))
+
+			lPos = client.LPos(ctx, "list", "b", redis.LPosArgs{Rank: 2, MaxLen: 1})
+			Expect(lPos.Err()).To(Equal(redis.Nil))
+
+			lPos = client.LPos(ctx, "list", "z", redis.LPosArgs{})
+			Expect(lPos.Err()).To(Equal(redis.Nil))
+		})
+
+		It("should LPosCount", func() {
+			rPush := client.RPush(ctx, "list", "a")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+			rPush = client.RPush(ctx, "list", "b")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+			rPush = client.RPush(ctx, "list", "c")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+			rPush = client.RPush(ctx, "list", "b")
+			Expect(rPush.Err()).NotTo(HaveOccurred())
+
+			lPos := client.LPosCount(ctx, "list", "b", 2, redis.LPosArgs{})
+			Expect(lPos.Err()).NotTo(HaveOccurred())
+			Expect(lPos.Val()).To(Equal([]int64{1, 3}))
+
+			lPos = client.LPosCount(ctx, "list", "b", 2, redis.LPosArgs{Rank: 2})
+			Expect(lPos.Err()).NotTo(HaveOccurred())
+			Expect(lPos.Val()).To(Equal([]int64{3}))
+
+			lPos = client.LPosCount(ctx, "list", "b", 1, redis.LPosArgs{Rank: 1, MaxLen: 1})
+			Expect(lPos.Err()).NotTo(HaveOccurred())
+			Expect(lPos.Val()).To(Equal([]int64{}))
+
+			lPos = client.LPosCount(ctx, "list", "b", 1, redis.LPosArgs{Rank: 1, MaxLen: 0})
+			Expect(lPos.Err()).NotTo(HaveOccurred())
+			Expect(lPos.Val()).To(Equal([]int64{1}))
+		})
+
 		It("should LPush", func() {
 			lPush := client.LPush(ctx, "list", "World")
 			Expect(lPush.Err()).NotTo(HaveOccurred())