HelpTextExtensions.cs

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// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.
 
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
 
namespace CommandLine
{
    public static class HelpTextExtensions
    {
        public static bool IsHelp(this IEnumerable<Error> errs)
        {
            if (errs.Any(x => x.Tag == ErrorType.HelpRequestedError ||
                              x.Tag == ErrorType.HelpVerbRequestedError
                        ))
            {
                return true;
            }
 
            //when  AutoHelp=false in parser, help is disabled  and Parser raise UnknownOptionError
            return errs.Any(x => (x is UnknownOptionError ee ? ee.Token : "") == "help");
        }
 
        public static bool IsVersion(this IEnumerable<Error> errs)
        {
            if (errs.Any(x => x.Tag == ErrorType.VersionRequestedError))
            {
                return true;
            }
 
            //when  AutoVersion=false in parser, Version is disabled  and Parser raise UnknownOptionError
            return errs.Any(x => (x is UnknownOptionError ee ? ee.Token : "") == "version");
        }
 
        public static TextWriter Output(this IEnumerable<Error> errs)
        {
            if (errs.IsHelp() || errs.IsVersion())
            {
                return Console.Out;
            }
 
            return Console.Error;
        }
    }
}