enhance: text editor (sourcegit-scm#365)

* support extra grammars.
* avoid crashing on text editor detached from visual tree

src/Models/TextMateHelper.cs

@@ -1,32 +1,112 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 
 using Avalonia;
+using Avalonia.Platform;
 using Avalonia.Styling;
 
 using AvaloniaEdit;
 using AvaloniaEdit.TextMate;
 
 using TextMateSharp.Grammars;
+using TextMateSharp.Internal.Grammars.Reader;
+using TextMateSharp.Internal.Types;
+using TextMateSharp.Registry;
+using TextMateSharp.Themes;
 
 namespace SourceGit.Models
 {
+    public class RegistryOptionsWrapper : IRegistryOptions
+    {
+        public RegistryOptionsWrapper(ThemeName defaultTheme)
+        {
+            _backend = new RegistryOptions(defaultTheme);
+            _extraGrammars = new Dictionary<string, IRawGrammar>();
+
+            string[] extraGrammarFiles = ["toml.json"];
+            foreach (var file in extraGrammarFiles)
+            {
+                var asset = AssetLoader.Open(new Uri($"avares://SourceGit/Resources/Grammars/{file}",
+                    UriKind.RelativeOrAbsolute));
+
+                try
+                {
+                    var grammar = GrammarReader.ReadGrammarSync(new StreamReader(asset));
+                    _extraGrammars.Add(grammar.GetScopeName(), grammar);
+                }
+                catch
+                {
+                    // ignore
+                }
+            }
+        }
+
+        public IRawTheme GetTheme(string scopeName)
+        {
+            return _backend.GetTheme(scopeName);
+        }
+
+        public IRawGrammar GetGrammar(string scopeName)
+        {
+            if (_extraGrammars.TryGetValue(scopeName, out var grammar))
+                return grammar;
+
+            return _backend.GetGrammar(scopeName);
+        }
+
+        public ICollection<string> GetInjections(string scopeName)
+        {
+            return _backend.GetInjections(scopeName);
+        }
+
+        public IRawTheme GetDefaultTheme()
+        {
+            return _backend.GetDefaultTheme();
+        }
+
+        public IRawTheme LoadTheme(ThemeName name)
+        {
+            return _backend.LoadTheme(name);
+        }
+
+        public string GetScopeByFileName(string filename)
+        {
+            var extension = Path.GetExtension(filename);
+            var scope = $"source{extension}";
+            if (_extraGrammars.ContainsKey(scope))
+                return scope;
+
+            if (extension == ".h")
+                extension = ".cpp";
+            else if (extension == ".resx" || extension == ".plist")
+                extension = ".xml";
+            else if (extension == ".command")
+                extension = ".sh";
+
+            return _backend.GetScopeByExtension(extension);
+        }
+
+        private RegistryOptions _backend = null;
+        private Dictionary<string, IRawGrammar> _extraGrammars = null;
+    }
+
     public static class TextMateHelper
     {
         public static TextMate.Installation CreateForEditor(TextEditor editor)
         {
             if (Application.Current?.ActualThemeVariant == ThemeVariant.Dark)
-                return editor.InstallTextMate(new RegistryOptions(ThemeName.DarkPlus));
+                return editor.InstallTextMate(new RegistryOptionsWrapper(ThemeName.DarkPlus));
 
-            return editor.InstallTextMate(new RegistryOptions(ThemeName.LightPlus));
+            return editor.InstallTextMate(new RegistryOptionsWrapper(ThemeName.LightPlus));
         }
 
         public static void SetThemeByApp(TextMate.Installation installation)
         {
             if (installation == null)
                 return;
 
-            if (installation.RegistryOptions is RegistryOptions reg)
+            if (installation.RegistryOptions is RegistryOptionsWrapper reg)
             {
                 if (Application.Current?.ActualThemeVariant == ThemeVariant.Dark)
                     installation.SetTheme(reg.LoadTheme(ThemeName.DarkPlus));
@@ -37,15 +117,9 @@ public static void SetThemeByApp(TextMate.Installation installation)
 
         public static void SetGrammarByFileName(TextMate.Installation installation, string filePath)
         {
-            if (installation is { RegistryOptions: RegistryOptions reg })
+            if (installation is { RegistryOptions: RegistryOptionsWrapper reg })
             {
-                var ext = Path.GetExtension(filePath);
-                if (ext == ".h")
-                    ext = ".cpp";
-                else if (ext == ".resx" || ext == ".plist")
-                    ext = ".xml";
-
-                installation.SetGrammar(reg.GetScopeByExtension(ext));
+                installation.SetGrammar(reg.GetScopeByFileName(filePath));
                 GC.Collect();
             }
         }

src/Native/Linux.cs

@@ -5,7 +5,6 @@
 using System.Runtime.Versioning;
 
 using Avalonia;
-using Avalonia.Dialogs;
 using Avalonia.Media;
 
 namespace SourceGit.Native