Prefer pep517 for loading project metadata.

CHANGES.rst

@@ -1,7 +1,12 @@
+v7.6.0
+======
+
+* Prefer ``pep517`` for loading project metadata.
+
 v7.5.0
 ======
 
-Switched to PEP 420 for ``jaraco`` namespace.
+* Switched to PEP 420 for ``jaraco`` namespace.
 
 v7.4.0
 ======

jaraco/develop/repo.py

@@ -1,21 +1,16 @@
-import sys
-import subprocess
 import urllib.parse
 
+import pep517.meta
 from jaraco.collections import ItemsAsAttributes
 
-from .py36compat import subprocess_run_text
-
 
 class Bunch(dict, ItemsAsAttributes):
     pass
 
 
 def get_project_metadata():
-    url, version = subprocess_run_text(
-        [sys.executable, 'setup.py', '--url', '--version'],
-        check=True,
-        stdout=subprocess.PIPE,
-    ).stdout.split()
+    dist = pep517.meta.load('.')
+    url = dist.metadata['Home-page']
+    version = dist.version
     project = urllib.parse.urlparse(url).path.strip('/')
     return Bunch(locals())

setup.cfg

@@ -28,6 +28,7 @@ install_requires =
 	PyNaCl
 	subprocess32; python_version < "3.7"
 	packaging
+	pep517
 setup_requires = setuptools_scm[toml] >= 3.4.1
 
 [options.packages.find]