public T Map <T>(T command, ICommandLine commandLine) where T : IConsoleCommand
{
if (command == null)
{
throw new ArgumentNullException(nameof(command));
}
if (commandLine == null)
{
throw new ArgumentNullException(nameof(commandLine));
}
// "Single" is fine because it's not possible to misconfigure the factory if commander-module is used so there is always a matching registration.
var registration = _registrations.Single(r => r.CommandType == command.GetType());
IEnumerable <string> GetValues(CommandParameter parameter)
{
if (parameter.Metadata.Position > CommandLine.CommandIndex)
{
return(commandLine.Anonymous().Skip(parameter.Metadata.Position).Take(1));
}
if (commandLine.Contains(parameter.Name))
{
return(commandLine[parameter.Name]);
}
return(null);
}
foreach (var parameter in registration)
{
_logger.Trace($"Mapping parameter {parameter.Name}.");
var values = GetValues(parameter)?.ToList();
// If parameter does not exist at all...
if (values is null)
{
// ...check if it should exist.
if (parameter.IsRequired)
{
throw ($"ArgumentNotFound{nameof(Exception)}", $"The required argument {parameter.Name} was not found.").ToDynamicException();
}
if (parameter.DefaultValue.IsNotNull())
{
parameter.SetValue(command, _converter.Convert(parameter.DefaultValue, parameter.Type));
}
}
else
{
if (parameter.Type == typeof(bool))
{
var flag = values.SingleOrDefault();
// User did not specify any value but a flag alone.
if (flag is null)
{
if (parameter.DefaultValue is bool defaultValue)
{
parameter.SetValue(command, !defaultValue);
}
else
{
// If DefaultValue is not set then the default is false. This negates it.
parameter.SetValue(command, true);
}
}
else
{
var value = _converter.Convert(flag, typeof(bool));
parameter.SetValue(command, value);
}
}
else
{
// Parameter is required but not values are specified. This is an error.
if (parameter.IsRequired && values.Empty())
{
throw ($"ArgumentNotFound{nameof(Exception)}", $"The required argument {parameter.Name} was not found.").ToDynamicException();
}
var convertible = parameter.Type.IsEnumerable(ignore: typeof(string)) ? (object)values : values.SingleOrDefault();
var value = _converter.Convert(convertible, parameter.Type);
parameter.SetValue(command, value);
}
}
}
return(command);
}