Extensions.cs

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using System;
 
namespace getopt.net {
 
    using System.Linq;
    using System.Text;
 
    public static class Extensions {
 
        public static Option? FindOptionOrDefault(this Option[] list, string optName) {
            if (string.IsNullOrEmpty(optName)) { throw new ArgumentNullException(nameof(optName), "optName must not be null!"); }
 
            return list.FirstOrDefault(o => o.Name?.Equals(optName, StringComparison.InvariantCulture) == true);
        }
 
        public static Option? FindOptionOrDefault(this Option[] list, char optVal) => list.FirstOrDefault(o => o.Value == optVal);
 
        public static string? ToShortOptString(this Option[] list) {
            if (list is null || list.Length == 0) { return null; }
 
            var sBuilder = new StringBuilder();
 
            foreach (var opt in list) {
                sBuilder.Append((char)opt.Value);
                switch (opt.ArgumentType) {
                    case ArgumentType.Required:
                        sBuilder.Append(':');
                        break;
                    case ArgumentType.Optional:
                        sBuilder.Append(';');
                        break;
                    default: break;
                }
            }
 
            return sBuilder.ToString();
        }
 
    }
}