Add version display

cmd/gmnhg/main.go

@@ -143,12 +143,23 @@ func writeFile(dst string, contents []byte) error {
 	return nil
 }
 
+var version = "v0+HEAD"
+
 func main() {
-	var outputDir, workingDir string
+	var (
+		outputDir, workingDir string
+		isVersionCmd          bool
+	)
 	flag.StringVar(&outputDir, "output", outputBase, "output directory (will be created if missing)")
 	flag.StringVar(&workingDir, "working", "", "working directory (defaults to current directory)")
+	flag.BoolVar(&isVersionCmd, "version", false, "display version")
 	flag.Parse()
 
+	if isVersionCmd {
+		println("gmnhg", version)
+		return
+	}
+
 	if workingDir != "" {
 		if err := os.Chdir(workingDir); err != nil {
 			panic(err)

cmd/md2gmn/main.go

@@ -25,14 +25,23 @@ import (
 	gemini "git.tdem.in/tdemin/gmnhg"
 )
 
+var version = "v0+HEAD"
+
 func main() {
 	var (
-		input string
-		file  *os.File
+		input        string
+		file         *os.File
+		isVersionCmd bool
 	)
 	flag.StringVar(&input, "f", "", "input file")
+	flag.BoolVar(&isVersionCmd, "version", false, "display version")
 	flag.Parse()
 
+	if isVersionCmd {
+		println("md2gmn", version)
+		return
+	}
+
 	if input != "" {
 		var err error
 		file, err = os.Open(input)