MercuryConverter/src/Utility/Utils.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Platform.Storage;
using Avalonia.Threading;
using MercuryConverter.UI;

namespace MercuryConverter.Utility;

public static class Utils
{
    public static string CoreCount => Environment.ProcessorCount.ToString();
    public static async Task<string> BeginDirSelection(string title, string? startDir = null)
    {
        IReadOnlyList<IStorageFolder>? dirSelection = null;

        await Dispatcher.UIThread.Invoke(async () =>
        {
            await Task.Delay(250);
            var tl = TopLevel.GetTopLevel(MainWindow.Instance)!;
            dirSelection = await tl.StorageProvider.OpenFolderPickerAsync
            (
                new FolderPickerOpenOptions
                {
                    Title = title,
                    AllowMultiple = false,
                    SuggestedStartLocation = startDir == null ? null : await tl.StorageProvider.TryGetFolderFromPathAsync(startDir),
                }
            );
        });

        if (dirSelection!.Count <= 0)
        {
            return "";
        }

        return dirSelection!.First().TryGetLocalPath()!;
    }
}