Better help text

numberstation.go

@@ -27,6 +27,24 @@ const (
 func main() {
 	// Define and parse the -r flag
 	repeat := flag.Bool("r", false, "Repeat each section separated by space, '-', '_', or a new line")
+
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s [options]\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "       %s [options] <<< \"String\"\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "       %s [options] < file.txt\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "       echo \"string\" | %s [options]\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "\nDescription:\n")
+		fmt.Fprintf(os.Stderr, "  A basic numbers station program that will read out loud the text of a provided string, one character at a time. It will\n")
+		fmt.Fprintf(os.Stderr, "  pause on line breaks, spaces, -, and _, and will repeat each section delimited by one of these characters if -r is used.\n")
+		fmt.Fprintf(os.Stderr, "  It also allows for an interactive mode if nothing is provided on stdin.\n")
+		fmt.Fprintf(os.Stderr, "\nOptions:\n")
+		flag.PrintDefaults() // Print the default flag help information
+		fmt.Fprintf(os.Stderr, "\nExamples:\n")
+		fmt.Fprintf(os.Stderr, "  %s <<< \"22101 12102 11210 20302 22072 122\"\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "  %s -r < file.txt\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "  %s\n", os.Args[0])
+	}
+
 	flag.Parse()
 
 	// Create a map to store sound data for each character