/// <summary>
/// Configures a <see cref="CommandLineApplication"/> to have an option specified by <paramref name="optionConfig"/>.
/// </summary>
/// <returns>
/// The <see cref="EnumOption{T}"/> created from the <see cref="CommandOption"/>
/// generated by <paramref name="cla"/>.
/// </returns>
public static EnumOption <T> EnumOption <T>(
this CommandLineApplication cla,
EnumOptionConfig <T> optionConfig
) where T : struct, System.Enum // requires c# 7.3
{
/*
* TODO: should package and reuse the checks used in the builder
* in case someone makes their EnumOptionConfig by hand to mess with the assumptions.
*/
var optionType = optionConfig.AllowMultiple ?
CommandOptionType.MultipleValue :
CommandOptionType.SingleValue;
string description = GenerateDescription(optionConfig);
var opt = cla.Option(
optionConfig.Template,
description,
optionType,
optionConfig.Configuration,
optionConfig.Inherited
);
return(new EnumOption <T>(
opt,
optionConfig.OptionValueMap,
optionConfig.ThrowOnInvalidOption
));
}
private static string GenerateDescription <T>(EnumOptionConfig <T> optionConfig) where T : struct, System.Enum
{
string description = optionConfig.Description;
if (optionConfig.DescribeArity)
{
const string mono = " Allows a single value.";
const string multi = " Allows multiple values.";
description += optionConfig.AllowMultiple ? multi : mono;
}
if (optionConfig.DescribeValues)
{
string valueDesc = optionConfig.OptionValueMap.Keys
.Aggregate((l, r) => l + ", " + r);
description += $" Possible values are: [{valueDesc}]";
}
return(description);
}