feat: Enhances git repo detection for worktrees (#181)

Fixes #180

Author: BenjaminMichaelis

IntelliTect.Multitool.Tests/RepositoryPaths.Tests.cs

@@ -43,4 +43,25 @@ public void TrySearchForGitContainingDirectory_ReturnsFalseWhenNotFound()
         Assert.False(RepositoryPaths.TrySearchForGitContainingDirectory(new DirectoryInfo(path), out string gitParentDirectory));
         Assert.Empty(gitParentDirectory);
     }
+
+    [Fact]
+    public void TrySearchForGitContainingDirectory_ReturnsTrueWhenGitIsAFile()
+    {
+        // In a git worktree, .git is a file (gitfile pointer), not a directory.
+        // This test simulates that scenario.
+        string tempRoot = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
+        string subDir = Path.Combine(tempRoot, "subdir");
+        try
+        {
+            Directory.CreateDirectory(subDir);
+            File.WriteAllText(Path.Combine(tempRoot, ".git"), "gitdir: ../.git/worktrees/my-branch");
+
+            Assert.True(RepositoryPaths.TrySearchForGitContainingDirectory(new DirectoryInfo(subDir), out string gitParentDirectory));
+            Assert.Equal(tempRoot, gitParentDirectory);
+        }
+        finally
+        {
+            Directory.Delete(tempRoot, recursive: true);
+        }
+    }
 }

IntelliTect.Multitool/Build/IntelliTect.Multitool.targets

@@ -32,6 +32,7 @@
             </LUTInformation>
         </PropertyGroup>
 
-        <WriteLinesToFile File="$(TempStagingPath)\IntelliTect.MultiTool.BuildVariables.tmp" Overwrite="true" Lines="$(LUTInformation)" />
+        <WriteLinesToFile File="$(TempStagingPath)\IntelliTect.MultiTool.BuildVariables.tmp" Overwrite="true" Lines="$(LUTInformation)" Condition="'$(SolutionDir)' != ''" />
+        <WriteLinesToFile File="$(TempStagingPath)\IntelliTect.MultiTool.BuildVariables.tmp" Overwrite="true" Lines="$(LUTInformation)" Condition="'$(SolutionDir)' == '' AND !Exists('$(TempStagingPath)\IntelliTect.MultiTool.BuildVariables.tmp')" />
     </Target>
 </Project>

IntelliTect.Multitool/RepositoryPaths.cs

@@ -71,7 +71,8 @@ public static bool TrySearchForGitContainingDirectory(DirectoryInfo? searchStart
         while (searchStartDirectory is not null)
         {
             DirectoryInfo[] subDirectories = searchStartDirectory.GetDirectories(".git");
-            if (subDirectories.Length > 0)
+            // Also check for a .git file (present in git worktrees as a gitfile pointer)
+            if (subDirectories.Length > 0 || File.Exists(Path.Combine(searchStartDirectory.FullName, ".git")))
             {
                 gitParentDirectory = searchStartDirectory.FullName;
                 return true;