Index range selection support in interactive mode

commands/interactive_mode.go

@@ -84,7 +84,7 @@ func readUserData(consumer *kafka.Consumer,
 	for _, index := range topicIndexes {
 		topic := remoteTopics[index]
 		topics[topic] = defaultCheckpoint
-		typeIndexes, err := pickAnIndex(fmt.Sprintf("stored in '%s' topic", topic), "message type", types, false)
+		typeIndexes, err := pickAnIndex(fmt.Sprintf("stored in %s topic", topic), "message type", types, false)
 		if err != nil {
 			return nil, nil, err
 		}
@@ -130,7 +130,7 @@ func pickAnIndex(msgSuffix, entryName string, input []string, multiSelect bool)
 	scanner := bufio.NewScanner(os.Stdin)
 	message := fmt.Sprintf("Enter the index of the %s %s (Q to quit): ", entryName, msgSuffix)
 	if multiSelect {
-		message = fmt.Sprintf("Enter a comma separated list of %s indices %s (Q to quit): ", entryName, msgSuffix)
+		message = fmt.Sprintf("Enter a comma separated list of %s indices %s (-:All, m-n:Range, Q to quit): ", entryName, msgSuffix)
 	}
 
 	for fmt.Print(message); scanner.Scan(); fmt.Print(message) {
@@ -148,42 +148,104 @@ func pickAnIndex(msgSuffix, entryName string, input []string, multiSelect bool)
 			return nil, errExitInteractiveMode
 		}
 
-		results = make([]int, 0)
+		results := make(map[int]interface{})
 
 		if !multiSelect {
-			index := parseIndex(trimmed, entryName, len(input))
-			if index < 0 {
+			indices, err := parseIndices(trimmed, entryName, len(input))
+			if err != nil {
+				printError(err)
+				continue
+			}
+			if len(indices) > 1 {
+				fmt.Printf("Only one %s can be selected.\n", entryName)
 				continue
 			}
-			results = append(results, index)
-			return results, nil
+			return []int{indices[0]}, nil
 		}
 
 		parts := strings.Split(trimmed, ",")
+		var failed bool
 		for _, part := range parts {
-			index := parseIndex(part, entryName, len(input))
-			if index < 0 {
+			indices, err := parseIndices(part, entryName, len(input))
+			if err != nil {
+				failed = true
+				printError(err)
 				break
 			}
-			results = append(results, index)
+			for _, index := range indices {
+				results[index] = nil
+			}
 		}
-		if len(results) != len(parts) {
+		if failed {
 			continue
 		}
-		return results, nil
+		return toIndices(results), nil
 	}
 
 	return nil, errExitInteractiveMode
 }
 
-func parseIndex(input, entryName string, length int) int {
+func printError(err error) {
+	fmt.Printf("%s.\n", internal.Title(err))
+}
+
+func toIndices(m map[int]interface{}) []int {
+	result := make([]int, 0)
+	for k := range m {
+		result = append(result, k)
+	}
+	return result
+}
+
+func parseIndices(input, entryName string, length int) ([]int, error) {
+	trimmed := strings.TrimSpace(input)
+	if trimmed == "-" {
+		return getRange(0, length-1), nil
+	}
+	ranges := strings.Split(trimmed, "-")
+	if len(ranges) == 2 {
+		from, err := parseIndex(ranges[0], entryName, length)
+		if err != nil {
+			return nil, err
+		}
+		to, err := parseIndex(ranges[1], entryName, length)
+		if err != nil {
+			return nil, err
+		}
+		if from == to {
+			return []int{to}, nil
+		}
+		if to < from {
+			return nil, fmt.Errorf("invalid index range")
+		}
+		return getRange(from, to), nil
+	}
+
+	index, err := parseIndex(trimmed, entryName, length)
+	if err != nil {
+		return nil, err
+	}
+	return []int{index}, nil
+}
+
+func getRange(from, to int) []int {
+	result := make([]int, 0)
+	for i := from; i <= to; i++ {
+		result = append(result, i)
+	}
+	return result
+}
+
+func parseIndex(input, entryName string, length int) (int, error) {
 	trimmed := strings.TrimSpace(input)
-	i, err := strconv.Atoi(strings.TrimSpace(trimmed))
-	if err != nil || i > length || i < 1 {
-		fmt.Printf("The selected %s index should be between 1 and %d\n", entryName, len(input))
-		return -1
+	i, err := strconv.Atoi(trimmed)
+	if err != nil {
+		return -1, errors.New("invalid index")
+	}
+	if i > length || i < 1 {
+		return -1, fmt.Errorf("the selected %s index must be between 1 and %d", entryName, length)
 	}
-	return i - 1
+	return i - 1, nil
 }
 
 // askForConfirmation asks the user for confirmation. The user must type in "yes/y", "no/n" or "exit/quit/q"

go.sum

@@ -1,16 +1,17 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-github.com/Shopify/sarama v1.24.1 h1:svn9vfN3R1Hz21WR2Gj0VW9ehaDGkiOS+VqlIcZOkMI=
-github.com/Shopify/sarama v1.24.1/go.mod h1:fGP8eQ6PugKEI0iUETYYtnP6d1pH/bdDMTel1X5ajsU=
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 github.com/Shopify/sarama v1.25.0/go.mod h1:y/CFFTO9eaMTNriwu/Q+W4eioLqiDMGkA1W+gmdfj8w=
 github.com/Shopify/toxiproxy v2.1.4+incompatible h1:TKdv8HiTLgE5wdJuEML90aBgNWsokNbMijUGhmcoBJc=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
+github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38 h1:smF2tmSOzy2Mm+0dGI2AIUHY+w0BUc+4tn40djz7+6U=
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+github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897 h1:p9Sln00KOTlrYkxI1zYWl1QLnEqAqEARBEYa8FQnQcY=
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@@ -55,8 +56,6 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/gookit/color v1.2.0 h1:lHA77Kuyi5JpBnA9ESvwkY+nanLjRZ0mHbWQXRYk2Lk=
-github.com/gookit/color v1.2.0/go.mod h1:AhIE+pS6D4Ql0SQWbBeXPHw7gY0/sjHoA4s/n1KB7xg=
 github.com/gookit/color v1.2.2 h1:IPG03BHqn23rgU597fFC8UNdlvEbQrZxYQyZqE0wkDw=
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 github.com/hashicorp/go-uuid v1.0.1 h1:fv1ep09latC32wFoVwnqcnKJGnMSdBanPczbHAYm1BE=
@@ -67,18 +66,10 @@ github.com/jcmturner/gofork v0.0.0-20190328161633-dc7c13fece03 h1:FUwcHNlEqkqLjL
 github.com/jcmturner/gofork v0.0.0-20190328161633-dc7c13fece03/go.mod h1:MK8+TM0La+2rjBD4jE12Kj1pCCxK7d2LK/UM3ncEo0o=
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 github.com/jcmturner/gofork v1.0.0/go.mod h1:MK8+TM0La+2rjBD4jE12Kj1pCCxK7d2LK/UM3ncEo0o=
-github.com/jhump/protoreflect v1.5.0 h1:NgpVT+dX71c8hZnxHof2M7QDK7QtohIJ7DYycjnkyfc=
-github.com/jhump/protoreflect v1.5.0/go.mod h1:eaTn3RZAmMBcV0fifFvlm6VHNz3wSkYyXYWUh7ymB74=
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@@ -87,25 +78,20 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
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 github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR/tNboyR3/BZd58JJSHlUSCU=
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-github.com/pierrec/lz4 v2.3.0+incompatible h1:CZzRn4Ut9GbUkHlQ7jqBXeZQV41ZSKWFc302ZU6lUTk=
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@@ -115,6 +101,7 @@ github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a h1:9ZKAASQSHhD
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
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 github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
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@@ -131,10 +118,6 @@ github.com/xitonix/flags v0.1.1/go.mod h1:u2wBVLaMlqa31kAZB4eqmq7jFX6SmMR8QBDMB3
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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-golang.org/x/crypto v0.0.0-20191122220453-ac88ee75c92c/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413 h1:ULYEB3JvPRE/IfO+9uO7vKV/xzVTO7XPAwm8xbf4w2g=
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 golang.org/x/crypto v0.0.0-20200117160349-530e935923ad h1:Jh8cai0fqIK+f6nG0UgPW5wFk8wmiMhM3AyciDBdtQg=
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@@ -149,10 +132,6 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a h1:oWX7TPOiFAMXLq8o0ikBYfCJV
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 golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -179,12 +158,6 @@ google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9Ywl
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20170818010345-ee236bd376b0/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20191115221424-83cc0476cb11 h1:51D++eCgOHufw5VfDE9Uzqyyc+OyQIjb9hkYy9LN5Fk=
-google.golang.org/genproto v0.0.0-20191115221424-83cc0476cb11/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
-google.golang.org/genproto v0.0.0-20191206224255-0243a4be9c8f h1:naitw5DILWPQvG0oG04mR9jF8fmKpRdW3E3zzKA4D0Y=
-google.golang.org/genproto v0.0.0-20191206224255-0243a4be9c8f/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
-google.golang.org/genproto v0.0.0-20191216205247-b31c10ee225f h1:0RYv5T9ZdroAqqfM2taEB0nJrArv0X1JpIdgUmY4xg8=
-google.golang.org/genproto v0.0.0-20191216205247-b31c10ee225f/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/genproto v0.0.0-20200117163144-32f20d992d24 h1:wDju+RU97qa0FZT0QnZDg9Uc2dH0Ql513kFvHocz+WM=
 google.golang.org/genproto v0.0.0-20200117163144-32f20d992d24/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/grpc v1.8.0 h1:HN69LlNA/SpyBIRxTfuU0QOntYfdeEeBWlVhRHRCOyw=
@@ -204,8 +177,6 @@ gopkg.in/jcmturner/goidentity.v3 v3.0.0 h1:1duIyWiTaYvVx3YX2CYtpJbUFd7/UuPYCfgXt
 gopkg.in/jcmturner/goidentity.v3 v3.0.0/go.mod h1:oG2kH0IvSYNIu80dVAyu/yoefjq1mNfM5bm88whjWx4=
 gopkg.in/jcmturner/gokrb5.v7 v7.2.3 h1:hHMV/yKPwMnJhPuPx7pH2Uw/3Qyf+thJYlisUc44010=
 gopkg.in/jcmturner/gokrb5.v7 v7.2.3/go.mod h1:l8VISx+WGYp+Fp7KRbsiUuXTTOnxIc3Tuvyavf11/WM=
-gopkg.in/jcmturner/gokrb5.v7 v7.3.0 h1:0709Jtq/6QXEuWRfAm260XqlpcwL1vxtO1tUE2qK8Z4=
-gopkg.in/jcmturner/gokrb5.v7 v7.3.0/go.mod h1:l8VISx+WGYp+Fp7KRbsiUuXTTOnxIc3Tuvyavf11/WM=
 gopkg.in/jcmturner/gokrb5.v7 v7.4.0 h1:93nj3P1OfL8Nv5h8ItQaslmskOqa4ykG5zouRht3Ffo=
 gopkg.in/jcmturner/gokrb5.v7 v7.4.0/go.mod h1:l8VISx+WGYp+Fp7KRbsiUuXTTOnxIc3Tuvyavf11/WM=
 gopkg.in/jcmturner/rpc.v1 v1.1.0 h1:QHIUxTX1ISuAv9dD2wJ9HWQVuWDX/Zc0PfeC2tjc4rU=

kafka/consumer.go

@@ -372,6 +372,7 @@ func initClient(brokers []string, ops *Options) (sarama.Client, error) {
 	if err != nil {
 		return nil, err
 	}
+
 	config := sarama.NewConfig()
 	config.Version = version
 	config.Consumer.Return.Errors = true