dotnet-installer/src/Microsoft.DotNet.Cli.Utils/CommandContext.cs

// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Microsoft.DotNet.Cli.Utils
{
    internal static class CommandContext
    {
        internal static class Variables
        {
            private static readonly string Prefix = "DOTNET_CLI_CONTEXT_";
            internal static readonly string Verbose = Prefix + "VERBOSE";
            internal static readonly string AnsiPassThru = Prefix + "ANSI_PASS_THRU";
        }

        private static Lazy<bool> _verbose = new Lazy<bool>(() => GetBool(Variables.Verbose));
        private static Lazy<bool> _ansiPassThru = new Lazy<bool>(() => GetBool(Variables.AnsiPassThru));

        public static bool IsVerbose()
        {
            return _verbose.Value;
        }

        public static bool ShouldPassAnsiCodesThrough()
        {
            return _ansiPassThru.Value;
        }
        
        private static bool GetBool(string name, bool defaultValue = false)
        {
            var str = Environment.GetEnvironmentVariable(name);
            if (string.IsNullOrEmpty(str))
            {
                return defaultValue;
            }

            switch (str.ToLowerInvariant())
            {
                case "true":
                case "1":
                case "yes":
                    return true;
                case "false":
                case "0":
                case "no":
                    return false;
                default:
                    return defaultValue;
            }
        }
    }
}