// @nuget: CommandLineParser -Version 2.5.0

//https://github.com/commandlineparser/commandline/issues/414

//https://github.com/commandlineparser/commandline/issues/455

//based on https://dotnetfiddle.net/UacitX

​

using System;

using System.IO;

using CommandLine;

public class Program

{

    // Logic taken from test-case ParserTests.Help_screen_does_not_show_help_option_if_AutoHelp_is_disabled

    public static void Main()

    {

        var helpWriter = new StringWriter();

        //1) invalid with ERRORS for config.AutoHelp = false: Show errors and it's supposed to show help only

        //var sut = new Parser(config => { config.AutoHelp = false; config.HelpWriter = helpWriter; });

        //2) valid without errors  for config.AutoHelp = true

        var sut = new Parser(config => { config.AutoHelp = true; config.HelpWriter = helpWriter; });

        //3) valid help config.AutoVersion = false

        //var sut = new Parser(config => { config.AutoVersion = false; config.HelpWriter = helpWriter; });

        //4)remove config.AutoHelp

        //var sut = new Parser(config => { config.HelpWriter = helpWriter; });

​

        sut.ParseArguments<Simple_Options_With_HelpText_Set>(new string[] {"--help"});

​

        var helpText = helpWriter.ToString();

        // Error: auto-help was disabled in line 15 but is contained in helpText.

        Console.WriteLine(helpText);

    }

}

​

​

class Simple_Options_With_HelpText_Set

{

    [Option('v', "verbose", HelpText = "Comment extensively every operation.")]

    public bool Verbose { get; set; }

​

    [Option('i', "input-file", Required = true, HelpText = "Specify input file to be processed.")]

    public string FileName { get; set; }

}