Refix the command line parameters/usage.

font-util/font-out.go

@@ -457,11 +457,15 @@ show - under windows ?  :cat_scream:
 */
 
 func main() {
-	if len(os.Args) == 1 {
-		fmt.Println("Usage: font-out <command> [<args>] fontfile.tdf...")
+	var usage func() = func() {
+		fmt.Println("Usage: font-util <command> [<args>] fontfile.tdf...")
 		fmt.Println("  list    - List available fonts")
 		fmt.Println("  show    - Show fonts")
 		fmt.Println("  extract - Extract to source.go file")
+	}
+
+	if len(os.Args) == 1 {
+		usage()
 		return
 	}
 
@@ -490,6 +494,7 @@ func main() {
 		listCommand.Parse(os.Args[2:])
 		if listCommand.Parsed() {
 			if len(listCommand.Args()) == 0 {
+				listCommand.Usage()
 				fmt.Println("No TDF Font files given.")
 				os.Exit(2)
 			}
@@ -507,6 +512,7 @@ func main() {
 		extractCommand.Parse(os.Args[2:])
 
 	default:
+		usage()
 		fmt.Printf("%q is not a valid command.\n", os.Args[1])
 		os.Exit(2)
 	}
@@ -526,14 +532,14 @@ func main() {
 	if showCommand.Parsed() {
 		// Show Fonts
 		if len(fontList) == 0 {
-			fmt.Println("No Fonts selected.")
 			showCommand.Usage()
+			fmt.Println("No Fonts selected.")
 			os.Exit(2)
 		}
 
 		if len(showCommand.Args()) == 0 {
-			fmt.Println("No TDF Fonts files given.")
 			showCommand.Usage()
+			fmt.Println("No TDF Fonts files given.")
 			os.Exit(2)
 		}
 
@@ -546,14 +552,14 @@ func main() {
 	if extractCommand.Parsed() {
 		// Extract Fonts
 		if len(fontList) == 0 {
-			fmt.Println("No Fonts selected.")
 			extractCommand.Usage()
+			fmt.Println("No Fonts selected.")
 			os.Exit(2)
 		}
 
 		if len(extractCommand.Args()) == 0 {
-			fmt.Println("No TDF Fonts files given.")
 			extractCommand.Usage()
+			fmt.Println("No TDF Fonts files given.")
 			os.Exit(2)
 		}