chore(documentation): read version automatically from __init__.py

Author: zsquareplusc

documentation/conf.py

@@ -12,12 +12,30 @@
 # serve to show the default.
 
 import sys, os
+import pathlib
+import re
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 #sys.path.append(os.path.abspath('.'))
 
+def find_version(path: pathlib.Path):
+    """
+    Search the file for a version string.
+
+    file_path contain string path components.
+
+    Reads the supplied Python module as text without importing it.
+    """
+    version_file = path.read_text()
+    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.")
+
+
 # -- General configuration -----------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
@@ -48,9 +66,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.5'
+version = find_version(pathlib.Path(__file__).parent.parent / 'serial_asyncio' / '__init__.py')
 # The full version, including alpha/beta/rc tags.
-release = '0.5'
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.