fCraft.RankManager.FindRank C# (CSharp) Method

        public static Rank FindRank( [CanBeNull] string name ) {
            if( name == null ) return null;

            Rank result = null;
            foreach( string rankName in RanksByName.Keys ) {
                if( rankName.Equals( name, StringComparison.OrdinalIgnoreCase ) ) {
                    return RanksByName[rankName];
                }
                if( rankName.StartsWith( name, StringComparison.OrdinalIgnoreCase ) ) {
                    if( result == null ) {
                        result = RanksByName[rankName];
                    } else {
                        return null;
                    }
                }
            }
            return result;
        }

        internal static void Commands(Player player, Command cmd)
        {
            string param = cmd.Next();

            CommandDescriptor[] cd;

            if (param == null)
            {
                player.Message("List of available commands:");
                cd = CommandManager.GetCommands(false);
            }
            else if (param.StartsWith("@"))
            {
                string rankName = param.Substring(1);
                Rank   rank     = RankManager.FindRank(rankName);
                if (rank == null)
                {
                    player.Message("Unknown rank: {0}", rankName);
                    return;
                }
                else
                {
                    player.Message("List of commands available to {0}&S:", rank.GetClassyName());
                    cd = CommandManager.GetCommands(rank, true);
                }
            }
            else if (param.Equals("all", StringComparison.OrdinalIgnoreCase))
            {
                player.Message("List of ALL commands:");
                cd = CommandManager.GetCommands();
            }
            else if (param.Equals("hidden", StringComparison.OrdinalIgnoreCase))
            {
                player.Message("List of hidden commands:");
                cd = CommandManager.GetCommands(true);
            }
            else if (Enum.GetNames(typeof(CommandCategory)).Contains(param, StringComparer.OrdinalIgnoreCase))
            {
                CommandCategory category = (CommandCategory)Enum.Parse(typeof(CommandCategory), param, true);
                player.Message("List of {0} commands:", category);
                cd = CommandManager.GetCommands(category, false);
            }
            else if (Enum.GetNames(typeof(Permission)).Contains(param, StringComparer.OrdinalIgnoreCase))
            {
                Permission permission = (Permission)Enum.Parse(typeof(Permission), param, true);
                player.Message("List of commands that need {0} permission:", permission);
                cd = CommandManager.GetCommands(permission, true);
            }
            else
            {
                cdCommands.PrintUsage(player);
                return;
            }

            string[] commandNames = cd.Select(desc => desc.Name).ToArray();

            player.MessagePrefixed("&S   ", "&S   " + String.Join(", ", commandNames));
        }