// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
#nullable disable
 
using Microsoft.DotNet.Cli.Utils;
 
namespace Microsoft.DotNet.Cli.ShellShim;
 
internal static class ZshDetector
{
    private const string ZshFileName = "zsh";
    /// <summary>
    /// Returns true if the `SHELL` environment variable ends with `zsh` for the filename.
    /// </summary>
    public static bool IsZshTheUsersShell(IEnvironmentProvider environmentProvider)
    {
        string environmentVariable = environmentProvider.GetEnvironmentVariable("SHELL");
        if (string.IsNullOrWhiteSpace(environmentVariable))
        {
            return false;
        }
 
        if (Path.GetFileName(environmentVariable).Equals(ZshFileName, StringComparison.OrdinalIgnoreCase))
        {
            return true;
        }
 
        return false;
    }
}