Improve redistribute-ability (#151)

* Move functions needed to build project into setup.py

Signed-off-by: Dustin Ingram <di@users.noreply.github.com>

* Only execute setup() in __main__

Signed-off-by: Dustin Ingram <di@users.noreply.github.com>

Co-authored-by: Yurii Serhiichuk <xSAVIKx@users.noreply.github.com>

pypi_packaging.py

@@ -1,29 +1,7 @@
-import codecs
-
-import pkg_resources
 import os
+import pkg_resources
 
-
-def read(rel_path):
-    here = os.path.abspath(os.path.dirname(__file__))
-    with codecs.open(os.path.join(here, rel_path), "r") as fp:
-        return fp.read()
-
-
-def get_version(rel_path):
-    for line in read(rel_path).splitlines():
-        if line.startswith("__version__"):
-            delim = '"' if '"' in line else "'"
-            return line.split(delim)[1]
-    else:
-        raise RuntimeError("Unable to find version string.")
-
-
-# FORMAT: 1.x.x
-pypi_config = {
-    "version_target": get_version("cloudevents/__init__.py"),
-    "package_name": "cloudevents",
-}
+from setup import pypi_config
 
 
 def createTag():

setup.py

@@ -11,16 +11,38 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-from pypi_packaging import pypi_config
-
 from setuptools import setup, find_packages
 
+import os
+import codecs
 import pathlib
 
 
+def read(rel_path):
+    here = os.path.abspath(os.path.dirname(__file__))
+    with codecs.open(os.path.join(here, rel_path), "r") as fp:
+        return fp.read()
+
+
+def get_version(rel_path):
+    for line in read(rel_path).splitlines():
+        if line.startswith("__version__"):
+            delim = '"' if '"' in line else "'"
+            return line.split(delim)[1]
+    else:
+        raise RuntimeError("Unable to find version string.")
+
+
+# FORMAT: 1.x.x
+pypi_config = {
+    "version_target": get_version("cloudevents/__init__.py"),
+    "package_name": "cloudevents",
+}
+
 here = pathlib.Path(__file__).parent.resolve()
 long_description = (here / "README.md").read_text(encoding="utf-8")
 
+if __name__ == "__main__":
     setup(
         name=pypi_config["package_name"],
         summary="CloudEvents SDK Python",