CommandLineUtils Example

CommandLineUtilsExample.cs

using System;
using System.Linq;
using Microsoft.Extensions.CommandLineUtils;

namespace CommandLineTest
{
    class Program
    {
        public static void Main(params string[] args)
        {
            CommandLineApplication commandLineApplication =
                new CommandLineApplication(throwOnUnexpectedArg: false);

            commandLineApplication.Command("MyCommand",
                (myCommand) =>
                {
                    CommandArgument arguments = myCommand.Argument(
                        "arguments",
                        "Enter the full name of the person to be greeted.",
                        multipleValues: true);
                    CommandOption greeting = myCommand.Option(
                        "-$|-g |--greeting <greeting>",
                        "The greeting to display. The greeting supports"
                        + " a format string where {fullname} will be "
                        + "substituted with the full name.",
                        CommandOptionType.SingleValue);
                    CommandOption uppercase = myCommand.Option(
                        "-u | --uppercase", "Display the greeting in uppercase.",
                        CommandOptionType.NoValue);
                    myCommand.HelpOption("-? | -h | --help"); // help for MyCommand

                    myCommand.OnExecute(() =>
                    {
                        if (greeting.HasValue())
                        {
                            Console.WriteLine($"{(uppercase.HasValue() ? greeting.Value().ToUpper() : greeting.Value())}: {string.Join(", ", arguments.Values.Select(argument => uppercase.HasValue() ? argument.ToUpper() : argument))}");
                        }
                        return 0;
                    });

                    myCommand.Command("MySubCommand",
                        (mySubCommand) =>
                        {
                            var subArguments = mySubCommand.Argument(
                                "subArguments",
                                "MySubCommand arguments",
                                multipleValues: true);
                            var subOption = mySubCommand.Option(
                                "-o | --option <option>",
                                "MySubCommand option",
                                CommandOptionType.SingleValue);
                            mySubCommand.HelpOption("-? | -h | --help"); // help for MySubCommand

                            mySubCommand.OnExecute(() =>
                            {
                                if (subOption.HasValue())
                                {
                                    Console.WriteLine($"{subOption.Value()}: {string.Join(", ", subArguments.Values)}");
                                }
                                return 0;
                            });
                        }
                    );
                }
            );

            commandLineApplication.HelpOption("-x"); // top level help -- '-h | -? | --help would be consumed by 'dotnet run'
            commandLineApplication.Execute(args);
        }
    }
}