Improve worktree support

src/git.rs

@@ -138,7 +138,7 @@ pub fn find_parent_repository(path: impl AsRef<Path>) -> Option<PathBuf> {
     let mut path = path.as_ref();
 
     loop {
-        if path.join(DOT_GIT_DIRECTORY_NAME).is_dir() {
+        if path.join(DOT_GIT_DIRECTORY_NAME).exists() {
             return Some(path.to_path_buf());
         }
 
@@ -282,7 +282,7 @@ mod tests {
     }
 
     #[test]
-    fn test_find_parent_directory_success() {
+    fn test_find_parent_repository_success() {
         let temp_dir = TempDirectoryBuilder::default()
             .add_directory("repository/suddir/subsub")
             .add_directory("repository/.git")
@@ -305,6 +305,22 @@ mod tests {
         assert_eq!(find_parent_repository(&not_a_repo_sub), None);
     }
 
+    #[test]
+    fn test_find_parent_repository_worktree() {
+        let temp_dir = TempDirectoryBuilder::default()
+            .add_directory("worktree/subdir")
+            .add_empty_file("worktree/.git")
+            .build()
+            .unwrap();
+        let worktree_path = temp_dir.path().join("worktree");
+        let subdir_path = worktree_path.join("subdir");
+
+        assert_eq!(
+            find_parent_repository(&subdir_path).as_ref(),
+            Some(&worktree_path)
+        );
+    }
+
     #[test]
     fn test_find_ignored_files_not_a_git_repository() {
         let temp_dir = TempDirectoryBuilder::default().build().unwrap();