Add version

main.go

@@ -17,6 +17,18 @@ import (
 	"github.com/mojitaurelie/heic2jpg/exif"
 )
 
+const (
+	VERSION = "0.1.0"
+
+	usageDescription = `heic2jpg - v%s.%s.%s.%s
+Note: <file> is ignored when -dir is set
+
+	Usage: heic2jpg [OPTIONS] <file>
+
+OPTIONS:
+`
+)
+
 type (
 	filer interface {
 		IsDir() bool
@@ -25,11 +37,15 @@ type (
 )
 
 func usage() {
-	fmt.Printf("Usage: %s [OPTIONS] <file>\n\n", os.Args[0])
-	fmt.Printf("Note: <file> is ignored when -dir is set\n\nOPTIONS:\n")
+	fmt.Printf(usageDescription, VERSION, runtime.Version(), runtime.GOOS, runtime.GOARCH)
 	flag.PrintDefaults()
 }
 
+func version() {
+	fmt.Printf("heic2jpg - v%s.%s.%s.%s\n", VERSION, runtime.Version(), runtime.GOOS, runtime.GOARCH)
+	os.Exit(0)
+}
+
 func main() {
 	go func() {
 		if r := recover(); r != nil {
@@ -48,8 +64,13 @@ func main() {
 	removeOrig := flag.Bool("remove-original", false, "Remove the heic file after conversion")
 	overwriteOut := flag.Bool("overwrite", false, "Overwrite file if already exists")
 	outPath := flag.String("o", "", "Output directory")
+	v := flag.Bool("v", false, "Show version")
 	flag.Parse()
 
+	if *v {
+		version()
+	}
+
 	if *jpegQuality < 1 || *jpegQuality > 100 {
 		fmt.Println("W: Illegal value for jpeg quality, quality is set to ", jpeg.DefaultQuality)
 		*jpegQuality = jpeg.DefaultQuality