sendmail test

Program.cs

/*
 * Copyright (c) 2017 Yuki Ono
 * Licensed under the MIT License.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;

namespace sendmail_test {
    class Program {
        static string get_option(string[] args, string short_name, string long_name) {
            var short_idx = Array.IndexOf(args, short_name);
            var long_idx = Array.IndexOf(args, long_name);

            var idx = short_idx != -1 ? short_idx : long_idx != -1 ? long_idx : -1;

            if (idx == -1)
                return null;

            if (long_name == "--help")
                return idx != -1 ? "--help" : null;

            if (idx + 1 >= args.Length)
                throw new ArgumentException("Invalid option");

            return args[idx + 1];
        }
        
        static string get_option(string[] args, string name) {
            switch (name) {
                case "-h":
                case "--host":
                    return get_option(args, "-h", "--host");
                case "-p":
                case "--port":
                    return get_option(args, "-p", "--port");
                case "-fr":
                case "--from-recipients":
                    return get_option(args, "-fr", "--from-recipients");
                case "-f":
                case "--from":
                    return get_option(args, "-f", "--from");
                case "-r":
                case "--recipients":
                    return get_option(args, "-r", "--recipients");
                case "-s":
                case "--subject":
                    return get_option(args, "-s", "--subject");
                case "-b":
                case "--body":
                    return get_option(args, "-b", "--body");
                case "--help":
                    return get_option(args, null, "--help");
                default:
                    throw new ArgumentException("Unknown option: " + name);
            }
        }

        static string str_or_test(string s) {
            return s != null ? s : "Test";
        }

        static void print_usage() {
            Console.WriteLine("Usage: sendmail_test -h 172.16.x.xxx -f [email protected] -r [email protected]");
        }

        static void print_help() {
            Console.WriteLine("print_help");
        }

        static int Main(string[] args) {
            if (args.Length == 0) {
                print_usage();
                return 0;
            }

            try {
                if (get_option(args, "--help") != null) {
                    print_help();
                    return 0;
                }

                var host = get_option(args, "--host");
                var port = get_option(args, "--port");
                var from_recipients = get_option(args, "--from-recipients");
                var from = get_option(args, "--from");
                var recipients = get_option(args, "--recipients");
                var subject = get_option(args, "--subject");
                var body = get_option(args, "--body");

                var sc = new SmtpClient();
                sc.Host = host != null ? host : "localhost";
                sc.Port = port != null ? int.Parse(port) : 25;

                if (from_recipients != null) {
                    from = from_recipients;
                    recipients = from_recipients;
                }

                if (from == null || recipients == null) {
                    Console.WriteLine("from == null || recipients == null");
                    return 1;
                }

                sc.Send(from, recipients, str_or_test(subject), str_or_test(body));
                sc.Dispose();
            }
            catch (ArgumentException e) {
                Console.WriteLine("Error: " + e.Message);
                return 1;
            }

            return 0;
        }
    }
}