fix: replace hardcoded __version__ with importlib.metadata

A static string in __init__.py is a second source of truth that can
drift from pyproject.toml. importlib.metadata.version() reads the
installed package metadata, so there is only one authoritative place.
Also updates docs/conf.py to use the same approach instead of reading
the source file with a regex.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: farhan

docs/conf.py

@@ -12,32 +12,15 @@
 serve to show the default.
 """
 import os
-import re
 import sys
 from datetime import datetime, UTC
+from importlib.metadata import PackageNotFoundError, version
 from subprocess import check_call
 
-
-def get_version(*file_paths):
-    """
-    Extract the version string from the file.
-
-    Input:
-     - file_paths: relative path fragments to file with
-                   version string
-    """
-    filename = os.path.join(os.path.dirname(__file__), *file_paths)
-    version_file = open(filename, encoding="utf8").read()
-    version_match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]", version_file, re.M)
-    if version_match:
-        return version_match.group(1)
-    raise RuntimeError("Unable to find version string.")
-
-
-REPO_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-sys.path.append(REPO_ROOT)
-
-VERSION = get_version("../xapi_db_load", "__init__.py")
+try:
+    VERSION = version("xapi-db-load")
+except PackageNotFoundError:
+    VERSION = "unknown"
 
 
 # If extensions (or modules to document with autodoc) are in another directory,

xapi_db_load/__init__.py

@@ -2,4 +2,9 @@
 Scripts to generate fake xAPI data against various backends.
 """
 
-__version__ = "3.1.0"
+from importlib.metadata import PackageNotFoundError, version
+
+try:
+    __version__ = version("xapi-db-load")
+except PackageNotFoundError:
+    __version__ = "unknown"