mfgames-toolbuilder-cil/src/MfGames.ToolBuilder/GlobalOptionHelper.cs

using System.CommandLine;
using System.CommandLine.Parsing;

namespace MfGames.ToolBuilder
{
    /// <summary>
    /// Helper methods for pulling out values without performing the full parse.
    /// </summary>
    public static class GlobalOptionHelper
    {
        public static TType GetArgumentValue<TType>(
            Option<TType> option,
            string[] arguments,
            TType defaultValue)
        {
            var rootCommand = new RootCommand
            {
                option,
            };

            rootCommand.TreatUnmatchedTokensAsErrors = false;

            ParseResult results = rootCommand.Parse(arguments);

            if (!results.HasOption(option))
            {
                return defaultValue;
            }

            TType value = results.ValueForOption(option)!;

            return value;
        }
    }
}