Use format detector feature for TextViewer

QuickLook.Plugin/QuickLook.Plugin.TextViewer/Themes/HighlightingTheme.cs

@@ -0,0 +1,38 @@
+// Copyright © 2017-2025 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using ICSharpCode.AvalonEdit.Highlighting;
+
+namespace QuickLook.Plugin.TextViewer.Themes;
+
+public sealed class HighlightingTheme
+{
+    public static HighlightingTheme Default => new() // No case should be cached
+    {
+        HighlightingManager = HighlightingManager.Instance,
+    };
+
+    public string Theme { get; set; }
+
+    public bool IsDark => Theme == nameof(HighlightingThemeManager.Dark);
+
+    public HighlightingManager HighlightingManager { get; set; }
+
+    public IHighlightingDefinition SyntaxHighlighting { get; set; }
+
+    public string Extension { get; set; }
+}