private string Usage(Type type)
{
VerbAttribute verbAttr = type.GetCustomAttributes <VerbAttribute>().FirstOrDefault();
var options = OptionsClassProcessor.GetOptions(type);
var values = OptionsClassProcessor.GetValues(type);
var restOfInput = OptionsClassProcessor.GetRestOfInputProperty(type);
StringBuilder result = new StringBuilder();
if (verbAttr != null)
{
result.AppendLine(verbAttr.HelpText.SplitToLines(LineWidth + 20, 0) + Environment.NewLine);
}
foreach (var option in options.Values)
{
result.AppendFormat("{0,-20} {1}" + Environment.NewLine,
(option.IsShortOption ? "-" : "--") + option.Option,
option.Description.SplitToLines(LineWidth, PrepadSpaces));
}
foreach (var value in values.Values.OrderBy(v => v.Index))
{
result.AppendFormat("#{0,-19} {1}" + Environment.NewLine,
value.Index,
value.Description.SplitToLines(LineWidth, PrepadSpaces));
}
if (restOfInput != null)
{
result.AppendFormat("{0,-20} {1}" + Environment.NewLine,
"rest of input",
restOfInput.Item2.Description.SplitToLines(LineWidth, PrepadSpaces));
}
return(result.ToString());
}
private static ParseResult <object> SetRestOfInputPropertyIfAvailable(Type type, object instance, Tokenizer tokenizer)
{
var restOfInputProp = OptionsClassProcessor.GetRestOfInputProperty(type);
if (restOfInputProp != null)
{
if (restOfInputProp.Item2.Required && tokenizer.AtEnd)
{
return(ParseResult <object> .WithError("A value for the property '" + restOfInputProp.Item1.Name + "' is missing"));
}
restOfInputProp.Item1.SetValue(instance, tokenizer.RestOfInput);
}
return(null); // No error
}