StrangeTools/SubtitleFontCollection/Program.cs

// See https://aka.ms/new-console-template for more information
Console.WriteLine("Subtitle Font Collection");
Console.Write("Path:");
var p = Console.ReadLine();
var files = Directory.GetFiles(p);

var fontSet = new HashSet<string>();
foreach (var file in files)
{
    Console.Write(file);
    switch (Path.GetExtension(file).ToLower())
    {
        default:
            Console.WriteLine(" NO SUPPORT");
            break;
        case ".ass":
            var fonts = File.ReadAllLines(file)
                .Where(p => p.StartsWith("Style: ")).Select(p => p.Split(',')[1]).Distinct().ToArray();
            Console.WriteLine($" -> {fonts.Length}");

            foreach (var font in fonts)
            {
                fontSet.Add(font);
            }
            break;
    }
}

Console.WriteLine("=========================");
foreach (var f in fontSet) Console.WriteLine(f);
Console.WriteLine("=========================");