From 32c3ad30eb5c384d174ef00fe7459bc2afc2f4df Mon Sep 17 00:00:00 2001
From: Simon Cropp <simon.cropp@gmail.com>
Date: Sat, 10 Jan 2026 13:39:06 +1100
Subject: [PATCH 1/3] .

---
 .../DiffEngine.AotTests.csproj                | 20 +++++++
 src/DiffEngine.AotTests/GlobalUsings.cs       |  1 +
 src/DiffEngine.AotTests/Program.cs            | 58 +++++++++++++++++++
 src/DiffEngine.slnx                           |  3 +
 src/DiffEngine/DiffEngine.csproj              |  1 +
 src/DiffEngine/OrderReader.cs                 |  4 +-
 6 files changed, 84 insertions(+), 3 deletions(-)
 create mode 100644 src/DiffEngine.AotTests/DiffEngine.AotTests.csproj
 create mode 100644 src/DiffEngine.AotTests/GlobalUsings.cs
 create mode 100644 src/DiffEngine.AotTests/Program.cs

diff --git a/src/DiffEngine.AotTests/DiffEngine.AotTests.csproj b/src/DiffEngine.AotTests/DiffEngine.AotTests.csproj
new file mode 100644
index 00000000..339cf7f3
--- /dev/null
+++ b/src/DiffEngine.AotTests/DiffEngine.AotTests.csproj
@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <PublishAot>true</PublishAot>
+    <PublishTrimmed>true</PublishTrimmed>
+    <InvariantGlobalization>true</InvariantGlobalization>
+    <!-- Default RID for AOT publish; override with -r flag if needed -->
+    <RuntimeIdentifier Condition="'$(RuntimeIdentifier)' == '' and '$(PublishAot)' == 'true'">win-x64</RuntimeIdentifier>
+    <!-- Disable Fody IL weaving for AOT compatibility -->
+    <DisableFody>true</DisableFody>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DiffEngine\DiffEngine.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/DiffEngine.AotTests/GlobalUsings.cs b/src/DiffEngine.AotTests/GlobalUsings.cs
new file mode 100644
index 00000000..c1d1f261
--- /dev/null
+++ b/src/DiffEngine.AotTests/GlobalUsings.cs
@@ -0,0 +1 @@
+global using DiffEngine;
diff --git a/src/DiffEngine.AotTests/Program.cs b/src/DiffEngine.AotTests/Program.cs
new file mode 100644
index 00000000..5df4a5ae
--- /dev/null
+++ b/src/DiffEngine.AotTests/Program.cs
@@ -0,0 +1,58 @@
+public static class Program
+{
+    public static int Main()
+    {
+        try
+        {
+            TestDiffToolsAccess();
+            TestDefinitionsAccess();
+            TestToolResolution();
+
+            Console.WriteLine("All DiffEngine AOT tests passed!");
+            return 0;
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"Test failed: {ex}");
+            return 1;
+        }
+    }
+
+    static void TestDiffToolsAccess()
+    {
+        // Test that we can access DiffTools static properties without reflection issues
+        var isDetected = DiffTools.IsDetectedForExtension(DiffTool.VisualStudioCode, "txt");
+        Console.WriteLine($"DiffTools.IsDetectedForExtension(VSCode, 'txt'): {isDetected}");
+
+        var allTools = DiffTools.Resolved.ToList();
+        Console.WriteLine($"DiffTools.Resolved count: {allTools.Count}");
+    }
+
+    static void TestDefinitionsAccess()
+    {
+        // Test that tool definitions can be accessed
+        var definitions = Definitions.Tools.ToList();
+        Console.WriteLine($"Definitions.Tools count: {definitions.Count}");
+
+        foreach (var def in definitions.Take(3))
+        {
+            Console.WriteLine($"  Tool: {def.Tool}, Url: {def.Url}");
+        }
+    }
+
+    static void TestToolResolution()
+    {
+        // Test tool resolution
+        var found = DiffTools.TryFindByExtension("txt", out var resolved);
+        Console.WriteLine($"TryFindByExtension('txt'): found={found}");
+
+        if (found && resolved != null)
+        {
+            Console.WriteLine($"  Resolved tool: {resolved.Tool}");
+        }
+
+        // Test by name
+        var foundByName = DiffTools.TryFindByName(DiffTool.VisualStudioCode, out _);
+        Console.WriteLine($"TryFindByName(VisualStudioCode): found={foundByName}");
+    }
+}
diff --git a/src/DiffEngine.slnx b/src/DiffEngine.slnx
index daf64eff..2adaed3a 100644
--- a/src/DiffEngine.slnx
+++ b/src/DiffEngine.slnx
@@ -33,4 +33,7 @@
   <Project Path="FakeDiffTool/FakeDiffTool.csproj">
     <BuildType Solution="Release-NotWindows|*" Project="Release" />
   </Project>
+  <Project Path="DiffEngine.AotTests/DiffEngine.AotTests.csproj">
+    <BuildType Solution="Release-NotWindows|*" Project="Release" />
+  </Project>
 </Solution>
diff --git a/src/DiffEngine/DiffEngine.csproj b/src/DiffEngine/DiffEngine.csproj
index 2a93061b..e5e38d54 100644
--- a/src/DiffEngine/DiffEngine.csproj
+++ b/src/DiffEngine/DiffEngine.csproj
@@ -3,6 +3,7 @@
     <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT'">net462;net472;net48;net9.0;net10.0</TargetFrameworks>
     <TargetFrameworks>$(TargetFrameworks);net6.0;net7.0;net8.0;net9.0;net10.0</TargetFrameworks>
     <AllowUnsafeBlocks Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">true</AllowUnsafeBlocks>
+    <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">true</IsAotCompatible>
   </PropertyGroup>
   <ItemGroup>
     <Using Include="DiffEngine" />
diff --git a/src/DiffEngine/OrderReader.cs b/src/DiffEngine/OrderReader.cs
index 2f988845..90799217 100644
--- a/src/DiffEngine/OrderReader.cs
+++ b/src/DiffEngine/OrderReader.cs
@@ -2,9 +2,7 @@
 {
     public record Result(bool UsedToolOrderEnvVar, IEnumerable<DiffTool> Order);
 
-    static Result defaultResult = new(false, Enum
-        .GetValues(typeof(DiffTool))
-        .Cast<DiffTool>());
+    static Result defaultResult = new(false, Enum.GetValues<DiffTool>());
 
     public static Result ReadToolOrder()
     {

From b76f451370fa3a26e93faf5722a357680984b3fc Mon Sep 17 00:00:00 2001
From: Simon Cropp <simon.cropp@gmail.com>
Date: Sat, 10 Jan 2026 14:43:28 +1100
Subject: [PATCH 2/3] Update DiffEngine.AotTests.csproj

---
 src/DiffEngine.AotTests/DiffEngine.AotTests.csproj | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/DiffEngine.AotTests/DiffEngine.AotTests.csproj b/src/DiffEngine.AotTests/DiffEngine.AotTests.csproj
index 339cf7f3..5f37fcf3 100644
--- a/src/DiffEngine.AotTests/DiffEngine.AotTests.csproj
+++ b/src/DiffEngine.AotTests/DiffEngine.AotTests.csproj
@@ -9,8 +9,6 @@
     <InvariantGlobalization>true</InvariantGlobalization>
     <!-- Default RID for AOT publish; override with -r flag if needed -->
     <RuntimeIdentifier Condition="'$(RuntimeIdentifier)' == '' and '$(PublishAot)' == 'true'">win-x64</RuntimeIdentifier>
-    <!-- Disable Fody IL weaving for AOT compatibility -->
-    <DisableFody>true</DisableFody>
   </PropertyGroup>
 
   <ItemGroup>

From 56b66a6ce17f20933c05857163eb86f4e529972c Mon Sep 17 00:00:00 2001
From: Simon Cropp <simon.cropp@gmail.com>
Date: Sun, 11 Jan 2026 11:17:50 +1100
Subject: [PATCH 3/3] Update .gitignore

---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.gitignore b/.gitignore
index 542da962..c3c65245 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ obj/
 *.received.*
 nugets/
 .claude/settings.local.json
+nul