_metadata_from_built_wheel: pass metadata_directory=None (#48)

Fix #47

Author: masenf

docs/changelog.rst

@@ -1,6 +1,12 @@
 Release History
 ===============
 
+v1.5.0 - (2023-01-17)
+---------------------
+- When getting metadata from a built wheel, do not pass ``metadata_directory``
+  to ``build_wheel``, which forces the backend to generate the metadata - by :user:`masenf`.
+  (`#47 <https://github.com/tox-dev/pyproject-api/issues/47>`_)
+
 v1.4.0 - (2022-01-04)
 ---------------------
 - Add minimal CLI for debugging

src/pyproject_api/_frontend.py

@@ -453,7 +453,7 @@ def _metadata_from_built_wheel(
             wheel_result = getattr(self, cmd)(
                 wheel_directory=wheel_directory,
                 config_settings=config_settings,
-                metadata_directory=metadata_directory,
+                metadata_directory=None,  # let the backend populate the metadata
             )
             wheel = wheel_result.wheel
             if not wheel.exists():

tests/demo_pkg_inline/build.py

@@ -20,6 +20,8 @@
 record = "{}/RECORD".format(dist_info)
 content = {
     logic: "def do():\n    print('greetings from {}')".format(name),
+}
+metadata = {
     metadata: """
         Metadata-Version: 2.1
         Name: {}
@@ -62,6 +64,16 @@ def build_wheel(wheel_directory, metadata_directory=None, config_settings=None):
     with ZipFile(path, "w") as zip_file_handler:
         for arc_name, data in content.items():  # pragma: no branch
             zip_file_handler.writestr(arc_name, dedent(data).strip())
+        if metadata_directory is not None:
+            for sub_directory, _, filenames in os.walk(metadata_directory):
+                for filename in filenames:
+                    zip_file_handler.write(
+                        os.path.join(metadata_directory, sub_directory, filename),
+                        os.path.join(sub_directory, filename),
+                    )
+        else:
+            for arc_name, data in metadata.items():  # pragma: no branch
+                zip_file_handler.writestr(arc_name, dedent(data).strip())
     print("created wheel {}".format(path))
     return base_name