Replace find_version logic with exec to fix package version

Remove all the importlib trickery and use exec instead, as it was
essentially what this was doing anyway.

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

setup.py

@@ -10,8 +10,6 @@
 """
 
 import os
-from importlib.machinery import PathFinder
-from typing import Optional
 
 try:
     from setuptools import setup
@@ -19,32 +17,25 @@ except ImportError:
     from distutils.core import setup
 
 
-def find_version(load_path, name) -> Optional[str]:
-    """Find module version"""
-
-    module = None
-    spec = PathFinder.find_spec(name, load_path)
-    try:
-        module = spec.loader.load_module(name)
-    except (AttributeError, ImportError, SyntaxError):
-        return None
-    if module is None:
-        return None
-
-    for key in dir(module):
-        if key != '__version__':
-            continue
-        return getattr(module, key)
-    return None
-
-
 MODULE_FILE_PATH = os.path.join(
     os.path.dirname(os.path.abspath(__file__)),
-    'slixmpp_omemo',
+    'slixmpp_omemo', 'version.py'
 )
 
-VERSION = find_version(MODULE_FILE_PATH, 'version')
+def get_version() -> str:
+    """Returns version by looking at slixmpp_omemo/version.py"""
+
+    version = {}
+    with open(MODULE_FILE_PATH) as file:
+        exec(file.read(), version)
+
+    if '__version__' in version:
+        return version['__version__']
+    return 'missingno'
+
+
 DESCRIPTION = ('Slixmpp OMEMO plugin')
+VERSION = get_version()
 with open('README.rst', encoding='utf8') as readme:
     LONG_DESCRIPTION = readme.read()