detect submodules as repo (#5)

Co-authored-by: Almar Klein <almar@almarklein.org>

Author: Vipitis

README.md

@@ -18,7 +18,7 @@ The "installation":
 
 * Add the `_version.py` to the root of your library (next to the `__init__.py`).
 * Set the project name and `__version__` string.
-* In your `__init__.py`, use `from _version import __version__, version_info`.
+* In your `__init__.py`, use `from ._version import __version__, version_info`.
 * In `pyproject.toml` use `dynamic = ["version"]`.
 * The Flit build tool will now detect your project version. Other tools may
   need an extra line, e.g. `[tool.hatch.version]` `path = "lib_name/_version.py"`.

_version.py

@@ -1,5 +1,5 @@
 """
-_version.py v1.2
+_version.py v1.3
 
 Simple version string management, using a hard-coded version string
 for simplicity and compatibility, while adding git info at runtime.
@@ -30,8 +30,9 @@
 logger = logging.getLogger(project_name)
 
 # Get whether this is a repo. If so, repo_dir is the path, otherwise None.
+# .git is a dir in a normal repo and a file when in a submodule.
 repo_dir = Path(__file__).parents[1]
-repo_dir = repo_dir if repo_dir.joinpath(".git").is_dir() else None
+repo_dir = repo_dir if repo_dir.joinpath(".git").exists() else None
 
 
 def get_version():