Container size scan, improvements

src/GuiApp/Avalonia/FileTime.GuiApp/Converters/FormatSizeConverter.cs

@@ -1,46 +1,29 @@
 using System.Globalization;
 using Avalonia.Data.Converters;
+using ByteSizeLib;
 
 namespace FileTime.GuiApp.Converters;
 
 public class FormatSizeConverter : IValueConverter
 {
-    private const long OneKiloByte = 1024;
-    private const long OneMegaByte = OneKiloByte * 1024;
-    private const long OneGigaByte = OneMegaByte * 1024;
-    private const long OneTerraByte = OneGigaByte * 1024;
-
-    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
-    {
-        return (value, int.TryParse(parameter?.ToString(), out var prec)) switch
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture) =>
+        (value, int.TryParse(parameter?.ToString(), out var prec)) switch
         {
             (long size, true) => ToSizeString(size, prec),
             (long size, false) => ToSizeString(size),
             (null, _) => "...",
             _ => value
         };
-    }
 
     public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
     {
         throw new NotImplementedException();
     }
 
-    public static string ToSizeString(long fileSize, int precision = 1)
+    public static string ToSizeString(long fileSize, int? precision = null)
     {
-        var fileSizeD = (decimal)fileSize;
-        var (size, suffix) = fileSize switch
-        {
-            > OneTerraByte => (fileSizeD / OneTerraByte, "T"),
-            > OneGigaByte => (fileSizeD / OneGigaByte, "G"),
-            > OneMegaByte => (fileSizeD / OneMegaByte, "M"),
-            > OneKiloByte => (fileSizeD / OneKiloByte, "K"),
-            _ => (fileSizeD, "B")
-        };
-
-        var result = string.Format("{0:N" + precision + "}", size).Replace(',', '.');
-
-        if (result.Contains('.')) result = result.TrimEnd('0').TrimEnd('.');
-        return result + " " + suffix;
+        var size = new ByteSize(fileSize);
+        return precision == null? size.ToString()
+            : size.ToString("0." + new string('#', precision.Value));
     }
 }