/// <summary>
/// Setup an option and divine its attributes which will be processed during runtime.
/// </summary>
/// <param name="lettersDefinition"></param>
/// <param name="description"></param>
/// <param name="operation"></param>
/// <param name="isOptional"></param>
/// <param name="ignoreCase"></param>
public Option(string lettersDefinition, string description, Action <CommandLineManager> operation, bool isOptional = true, bool ignoreCase = true)
{
InitialLetterDefinition = lettersDefinition;
Letters = Regex.Matches(lettersDefinition, @"[^,\t\s]+")
.OfType <Match>()
.Select(mt => mt.Value)
.ToList();
Letter = Letters.FirstOrDefault(token => token.Length == 1)?.ToUpper();
IsSingleLetterOption = Letter != null;
//if (IsSingleLetterOption)
// Letter = Letters.FirstOrDefault(token => token.Length == 1)?.ToUpper() ?? Letters[0].Substring(0, 1).ToUpper();
var grouped = Letters.GroupBy(lt => lt.Length == 1)
.ToList();
LettersSingle = grouped.Where(gr => gr.Key)
.SelectMany(grp => grp.Select(letter => letter [0])
.ToList())
.ToList();
LettersMultiple = grouped.Where(gr => gr.Key == false)
.SelectMany(grp => grp)
.ToList();
Description = description;
Operation = operation;
IsOptional = isOptional;
}
