add --version flag

cmd/rdsmysql/main.go

@@ -25,6 +25,11 @@ func main() {
 }
 
 func run(c *config.Config) int {
+	if c.Version {
+		showVersion()
+		return 0
+	}
+
 	dir, err := os.MkdirTemp("", "rdsmysql-")
 	if err != nil {
 		log.Fatal(err)

cmd/rdsmysql/version.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"runtime/debug"
+)
+
+// the version is set by goreleaser
+var version = ""
+
+func getVersion() string {
+	if version != "" {
+		return version
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+	return info.Main.Version
+}
+
+func showVersion() {
+	fmt.Printf("rdsmysql version %s built with %s %s/%s\n", getVersion(), runtime.Version(), runtime.GOOS, runtime.GOARCH)
+}

cmd/rdsmysqldump/main.go

@@ -25,6 +25,11 @@ func main() {
 }
 
 func run(c *config.Config) int {
+	if c.Version {
+		showVersion()
+		return 0
+	}
+
 	dir, err := os.MkdirTemp("", "rdsmysql-")
 	if err != nil {
 		log.Fatal(err)

cmd/rdsmysqldump/version.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"runtime/debug"
+)
+
+// the version is set by goreleaser
+var version = ""
+
+func getVersion() string {
+	if version != "" {
+		return version
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+	return info.Main.Version
+}
+
+func showVersion() {
+	fmt.Printf("rdsmysql version %s built with %s %s/%s\n", getVersion(), runtime.Version(), runtime.GOOS, runtime.GOARCH)
+}

internal/config/config.go

@@ -57,10 +57,11 @@ enable-cleartext-plugin
 
 // Config is the configuration for connecting to mysql servers.
 type Config struct {
-	User string
-	Host string
-	Port int
-	Args []string
+	User    string
+	Host    string
+	Port    int
+	Version bool
+	Args    []string
 }
 
 // Parse parses the args of mysql command.
@@ -92,6 +93,8 @@ func Parse(args []string) (*Config, error) {
 				return nil, errors.New("fail to parse port")
 			}
 			conf.Port = port
+		case "-V", "--version":
+			conf.Version = true
 		default:
 			conf.Args = append(conf.Args, args[i])
 		}

v2/cmd/rdsmysql/main.go

@@ -25,6 +25,11 @@ func main() {
 }
 
 func run(c *config.Config) int {
+	if c.Version {
+		showVersion()
+		return 0
+	}
+
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 

v2/cmd/rdsmysql/version.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"runtime/debug"
+)
+
+// the version is set by goreleaser
+var version = ""
+
+func getVersion() string {
+	if version != "" {
+		return version
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+	return info.Main.Version
+}
+
+func showVersion() {
+	fmt.Printf("rdsmysql version %s built with %s %s/%s\n", getVersion(), runtime.Version(), runtime.GOOS, runtime.GOARCH)
+}

v2/cmd/rdsmysqldump/main.go

@@ -25,6 +25,11 @@ func main() {
 }
 
 func run(c *config.Config) int {
+	if c.Version {
+		showVersion()
+		return 0
+	}
+
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 

v2/cmd/rdsmysqldump/version.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"runtime/debug"
+)
+
+// the version is set by goreleaser
+var version = ""
+
+func getVersion() string {
+	if version != "" {
+		return version
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+	return info.Main.Version
+}
+
+func showVersion() {
+	fmt.Printf("rdsmysql version %s built with %s %s/%s\n", getVersion(), runtime.Version(), runtime.GOOS, runtime.GOARCH)
+}

v2/internal/config/config.go

@@ -56,10 +56,11 @@ enable-cleartext-plugin
 
 // Config is the configuration for connecting to mysql servers.
 type Config struct {
-	User string
-	Host string
-	Port int
-	Args []string
+	User    string
+	Host    string
+	Port    int
+	Version bool
+	Args    []string
 }
 
 // Parse parses the args of mysql command.
@@ -91,6 +92,8 @@ func Parse(args []string) (*Config, error) {
 				return nil, errors.New("fail to parse port")
 			}
 			conf.Port = port
+		case "-V", "--version":
+			conf.Version = true
 		default:
 			conf.Args = append(conf.Args, args[i])
 		}