static void ShowUsage(IList<string> errors = null)
{
var help = new HelpText();
help.Heading = "SizePhotos";
help.AddPreOptionsLine("A tool to prepare and optimize images for display on the web.");
// this is a little lame, but force a NotParsed<T> options result
// so that we can get a nice help screen. this might be required
// if the passed args are valid to the parser, but not w/ custom
// validation logic that runs after parsing
var parser = new Parser(config => config.HelpWriter = null);
var result = parser.ParseArguments<SizePhotoOptions>(new string[] { "--xxx" });
help.AddOptions(result);
if(errors != null)
{
help.AddPostOptionsLine("Errors:");
help.AddPostOptionsLines(errors);
}
Console.WriteLine(help.ToString());
}
