updated CLI README.md

cli/xgotext/README.md

@@ -11,7 +11,7 @@ go install github.com/leonelquinteros/gotext/cli/xgotext
 ## Usage
 
 ```
-xgotext /path/to/go/package [/path/to/output/dir]
+xgotext -in /path/to/go/package -out /path/to/output/dir
 ```
 
 ## Implementation
@@ -31,7 +31,7 @@ tr := "Translate this string"
 gotext.Get(tr)
 ```
 
-The CLI tool doesn't traverse sub-directories and other packages.
+The CLI tool traverse sub-directories based on the given input directory.
 
 
 ## Contribute

cli/xgotext/main.go

@@ -20,6 +20,13 @@ func main() {
 	// Init logger
 	log.SetFlags(0)
 
+	if *dirName == "" {
+		log.Fatal("No input directory given")
+	}
+	if *outputDir == "" {
+		log.Fatal("No output directory given")
+	}
+
 	data, err := parser.ParseDirRec(*dirName)
 	if err != nil {
 		log.Fatal(err)