FluentAvalonia/samples/FluentAvaloniaSamples/ViewModels/WhatsNewPageViewModel.cs

using System;
using System.Collections.Generic;
using System.IO;
using Avalonia;
using Avalonia.Platform;

namespace FluentAvaloniaSamples.ViewModels;

public class WhatsNewPageViewModel : ViewModelBase
{
    public WhatsNewPageViewModel()
    {
        Versions = new List<FAVersionInfo>();

        //using (var stream = AvaloniaLocator.Current.GetService<IAssetLoader>().Open(new Uri("avares://FluentAvaloniaSamples/Assets/ChangeLog.txt")))
        //using (var sr = new StreamReader(stream))
        //{
        //    FAVersionInfo currentVersion = null;
        //    bool hasVersion = false;
        //    while (sr.Peek() != -1)
        //    {

        //        var line = sr.ReadLine();
        //        if (line.StartsWith('#')) // Comment
        //            continue;

        //        if (string.IsNullOrEmpty(line)) // Empty line
        //            continue;

        //        if (line.StartsWith('['))
        //        {
        //            if (!hasVersion)
        //            {
        //                currentVersion = new FAVersionInfo() { Version = line.Substring(1, line.Length - 2) };
        //                hasVersion = true;
        //            }
        //            else
        //            {
        //                // new version found

        //                Versions.Insert(0, currentVersion);
        //                currentVersion = new FAVersionInfo() { Version = line.Substring(1, line.Length - 2) };
        //            }

        //            continue;
        //        }

        //        currentVersion.ChangeItems.Add(ReadLine(line));
        //    }

        //    Versions.Insert(0, currentVersion);
        //}


        CurrentVersion = Versions[0];
    }

    public List<FAVersionInfo> Versions { get; }

    public FAVersionInfo CurrentVersion
    {
        get => _version;
        set => RaiseAndSetIfChanged(ref _version, value);
    }

    private FAChangeItemBase ReadLine(string line)
    {
        if (line.StartsWith('*'))
        {
            return new FAChangeItemHeader { Header = line.Substring(1) };
        }
        else if (line.StartsWith("--"))
        {
            return new FAChangeSubItem { Text = line.Substring(2) };
        }
        else
        {
            return new FAChangeItemDescription { Text = line.Substring(1) };
        }
    }

    private FAVersionInfo _version;
}

public class FAVersionInfo
{
    public string Version { get; set; }

    public List<FAChangeItemBase> ChangeItems { get; } = new List<FAChangeItemBase>();
}

public class FAChangeItemBase
{

}

public class FAChangeItemHeader : FAChangeItemBase
{
    public string Header { get; set; }
}

public class FAChangeItemDescription : FAChangeItemBase
{
    public string Text { get; set; }
}

public class FAChangeSubItem : FAChangeItemBase
{
    public string Text { get; set; }
}