I was just writing a console utility and decided to use NDesk.Options for command-line parsing. My question is, How do I enforce required command-line options?
I see in the docs that:
options with a required value (append '=' to the option name) or an optional value (append ':' to the option name).
However, when I put a =
at the end of the option name there is no difference in behavior. Ideally the Parse method would throw an exception.
Is there something else I need to do?
Here is my test code:
class Program
{
static void Main(string[] args)
{
bool show_help = false;
string someoption = null;
var p = new OptionSet() {
{ "someoption=", "Some String Option", v => someoption = v},
{ "h|help", "show this message and exit", v => show_help = v != null }
};
List<string> extra;
try
{
extra = p.Parse(args);
}
catch (OptionException e)
{
System.Console.Write("myconsole: ");
System.Console.WriteLine(e.Message);
System.Console.WriteLine("Try `myconsole --help' for more information.");
return;
}
if (show_help)
{
ShowHelp(p);
return;
}
System.Console.WriteLine("==================");
System.Console.WriteLine(someoption);
}
static void ShowHelp(OptionSet p)
{
System.Console.WriteLine("Usage: myconsole [OPTIONS]");
System.Console.WriteLine();
System.Console.WriteLine("Options:");
p.WriteOptionDescriptions(System.Console.Out);
}
}