/// <summary>
/// Use when the user needs to decide on possible options
/// It invokes <see cref="OnQuestion"/> where the implementer can either block uppm with user query or use the default value.
/// </summary>
/// <typeparam name="T">Must be an enum</typeparam>
/// <param name="question">Question to be asked from user</param>
/// <param name="note">Displayed on top of the prompt</param>
/// <param name="possibilities">If null any input will be accepted. Otherwise input is compared to these possible entries.</param>
/// <param name="defaultValue">This value is used when user submits an empty input or in a potential unattended mode.</param>
/// <returns>User answer or default</returns>
public static T PromptForEnum <T>(
this PSCmdlet cmdlet,
string question,
string note = "",
IEnumerable <T> possibilities = null,
T defaultValue = default(T)) where T : struct
{
if (!typeof(T).IsEnum)
{
throw new ArgumentException($"{typeof(T)} type is not enum.");
}
var poss = possibilities == null?Enum.GetNames(typeof(T)) : possibilities.Select(p => p.ToString());
var resstr = cmdlet.PromptForChoice(question, note, poss, defaultValue.ToString());
return(Enum.TryParse <T>(resstr, true, out var res) ? res : defaultValue);
}