private bool TryParseHelpVerb(string[] args, object options, Pair <MethodInfo, HelpVerbOptionAttribute> helpInfo,
OptionMap optionMap)
{
TextWriter helpWriter = _settings.HelpWriter;
if (helpInfo != null && helpWriter != null)
{
if (string.Compare(args[0], helpInfo.Right.LongName, GetStringComparison(_settings)) == 0)
{
// User explicitly requested help
string verb = args.FirstOrDefault();
if (verb != null)
{
OptionInfo verbOption = optionMap[verb];
if (verbOption != null)
{
if (verbOption.GetValue(options) is null)
{
// We need to create an instance also to render help
verbOption.CreateInstance(options);
}
}
}
DisplayHelpVerbText(options, helpInfo, verb);
return(true);
}
}
return(false);
}
private bool DoParseArgumentsVerbs(string[] args, object options, ref object verbInstance)
{
IList <Pair <PropertyInfo, VerbOptionAttribute> > verbs =
ReflectionHelper.RetrievePropertyList <VerbOptionAttribute>(options);
Pair <MethodInfo, HelpVerbOptionAttribute> helpInfo =
ReflectionHelper.RetrieveMethod <HelpVerbOptionAttribute>(options);
if (args.Length == 0)
{
if (helpInfo != null && _settings.HelpWriter != null)
{
DisplayHelpVerbText(options, helpInfo, null);
}
return(false);
}
OptionMap optionMap = OptionMap.Create(options, verbs, _settings);
if (TryParseHelpVerb(args, options, helpInfo, optionMap))
{
return(false);
}
OptionInfo verbOption = optionMap[args.First()];
// User invoked a bad verb name
if (verbOption is null)
{
if (helpInfo != null)
{
DisplayHelpVerbText(options, helpInfo, null);
}
return(false);
}
verbInstance = verbOption.GetValue(options);
if (verbInstance is null)
{
// Developer has not provided a default value and did not assign an instance
verbInstance = verbOption.CreateInstance(options);
}
bool verbResult = DoParseArgumentsCore(args.Skip(1).ToArray(), verbInstance);
if (!verbResult && helpInfo != null)
{
// Particular verb parsing failed, we try to print its help
DisplayHelpVerbText(options, helpInfo, args.First());
}
return(verbResult);
}