Add API to retrieve project metadata from an installed package.

pyroma/projectdata.py

@@ -4,6 +4,7 @@
 import os
 import pathlib
 import re
+from importlib.metadata import metadata
 
 from setuptools.config.setupcfg import read_configuration
 from distutils.errors import DistutilsFileError
@@ -47,6 +48,10 @@ def build_metadata(path, isolated=None):
         # metadata from PyPI, we just couldn't get the additional build data.
         return {"_wheel_build_failed": True}
 
+    return normalize_metadata(metadata)
+
+
+def normalize_metadata(metadata):
     # As far as I can tell, we can't trust that the builders normalize the keys,
     # so we do it here. Definitely most builders do not lower case them, which
     # Core Metadata Specs recommend.
@@ -72,6 +77,11 @@ def build_metadata(path, isolated=None):
     return data
 
 
+def installed_metadata(name):
+    """Retrieve the metadata for an package that is installed in the environment."""
+    return normalize_metadata(metadata(name))
+
+
 def get_build_data(path, isolated=None):
     metadata = build_metadata(path, isolated=isolated)
     # Check if there is a pyproject_toml

pyroma/tests.py

@@ -334,6 +334,40 @@ def test_complete(self):
         del data["_path"]  # This changes, so I just ignore it
         self.assertEqual(data, COMPLETE)
 
+    def test_installed(self):
+        # pyroma must be installed in the test environment.
+        data = projectdata.installed_metadata("pyroma")
+
+        # Verify some key metadata
+        self.assertEqual(data["name"], "pyroma")
+        self.assertEqual(data["summary"], "Test your project's packaging friendliness")
+        self.assertEqual(data["classifier"], [
+            "Development Status :: 5 - Production/Stable",
+            "Intended Audience :: Developers",
+            "License :: OSI Approved :: MIT License",
+            "Operating System :: OS Independent",
+            "Programming Language :: Python",
+            "Programming Language :: Python :: 3",
+            "Programming Language :: Python :: 3.9",
+            "Programming Language :: Python :: 3.10",
+            "Programming Language :: Python :: 3.11",
+            "Programming Language :: Python :: 3.12",
+            "Programming Language :: Python :: 3.13",
+            "Programming Language :: Python :: 3.14",
+            "Programming Language :: Python :: 3 :: Only",
+            "Programming Language :: Python :: Implementation :: CPython",
+            "Programming Language :: Python :: Implementation :: PyPy",
+        ])
+        self.assertEqual(data["keywords"], "pypi,quality,testing")
+        self.assertEqual(data["author"], "Lennart Regebro")
+        self.assertEqual(data["author-email"], "[email protected]")
+        self.assertEqual(data["home-page"], "https://github.com/regebro/pyroma")
+        self.assertEqual(data["license"], "MIT")
+        self.assertEqual(data["license-file"], "LICENSE.txt")
+        self.assertEqual(data["project-url"], "Source Code, https://github.com/regebro/pyroma")
+        self.assertEqual(data["provides-extra"], "test")
+        self.assertEqual(data["requires-python"], "3.9")
+
 
 class DistroDataTest(unittest.TestCase):
     maxDiff = None