MainWindow skeleton

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

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+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace FileTime.GuiApp.Converters
+{
+    public enum ComparisonCondition
+    {
+        Equal,
+        GreaterThan,
+        LessThan,
+        LessThanOrEqual,
+        NotEqual,
+        GreaterThanOrEqual
+    }
+
+    public class CompareConverter : IValueConverter
+    {
+        public ComparisonCondition ComparisonCondition { get; set; } = ComparisonCondition.Equal;
+
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            return Compare(value, parameter);
+        }
+
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+
+        private bool Compare(object? value, object? parameter)
+        {
+            if (ComparisonCondition == ComparisonCondition.GreaterThan)
+            {
+                if (value is int valueInt && (parameter is int parameterInt || int.TryParse(parameter?.ToString(), out parameterInt))) return valueInt > parameterInt;
+                else if (value is double valueDouble && (parameter is double parameterDouble || double.TryParse(parameter?.ToString(), out parameterDouble))) return valueDouble > parameterDouble;
+                else throw new NotSupportedException();
+            }
+            else if (ComparisonCondition == ComparisonCondition.NotEqual)
+            {
+                if (value is int valueInt && (parameter is int parameterInt || int.TryParse(parameter?.ToString(), out parameterInt))) return valueInt != parameterInt;
+                else if (value is double valueDouble && (parameter is double parameterDouble || double.TryParse(parameter?.ToString(), out parameterDouble))) return valueDouble != parameterDouble;
+                return value != parameter;
+            }
+            else if (ComparisonCondition == ComparisonCondition.Equal)
+            {
+                if (value is int valueInt && (parameter is int parameterInt || int.TryParse(parameter?.ToString(), out parameterInt))) return valueInt == parameterInt;
+                else if (value is double valueDouble && (parameter is double parameterDouble || double.TryParse(parameter?.ToString(), out parameterDouble))) return valueDouble == parameterDouble;
+                else if (value?.GetType().IsEnum ?? false && Enum.TryParse(value.GetType(), parameter?.ToString(), out var _)) return value.ToString() == parameter?.ToString();
+            }
+
+            return value == parameter;
+        }
+    }
+}

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

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+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace FileTime.GuiApp.Converters
+{
+    public class SplitStringConverter : IValueConverter
+    {
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            if (value is string path && parameter is string separator)
+            {
+                return path.Split(separator);
+            }
+            else if (value is string path2 && parameter is char separator2)
+            {
+                return path2.Split(separator2);
+            }
+
+            return value;
+        }
+
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}