feat: support PEP 753

Signed-off-by: Henry Schreiner <[email protected]>

pyproject.toml

@@ -50,6 +50,12 @@ homepage = "https://github.com/pypa/pyproject-metadata"
 [tool.flit.sdist]
 include = ["LICENSE", "tests/**", "docs/**", ".gitignore"]
 
+[tool.uv]
+dev-dependencies = ["pyproject-metadata[test]"]
+environments = [
+  "python_version >= '3.10'",
+]
+
 
 [tool.pytest.ini_options]
 minversion = "6.0"
@@ -93,7 +99,8 @@ extend-select = [
 ]
 ignore = [
   "ISC001",  # conflicts with formatter
-  "PLR09",  # Design related (too many X)
+  "PLR09",   # Design related (too many X)
+  "PLR2004", # Magic value in comparison
 ]
 
 [tool.ruff.format]

pyproject_metadata/__init__.py

@@ -481,6 +481,7 @@ def validate(self, *, warn: bool = True) -> None:  # noqa: C901
         - License classifiers deprecated for metadata_version >= 2.4 (warning)
         - ``license`` is an SPDX license expression if metadata_version >= 2.4
         - ``license_files`` is supported only for metadata_version >= 2.4
+        - ``project_url`` can't contain keys over 32 characters
         """
         errors = ErrorCollector(collect_errors=self.all_errors)
 
@@ -544,6 +545,11 @@ def validate(self, *, warn: bool = True) -> None:  # noqa: C901
             msg = "{key} is supported only when emitting metadata version >= 2.4"
             errors.config_error(msg, key="project.license-files")
 
+        for name in self.urls:
+            if len(name) > 32:
+                msg = "{key} names cannot be more than 32 characters long"
+                errors.config_error(msg, key="project.urls", got=name)
+
         errors.finalize("Metadata validation failed")
 
     def _write_metadata(  # noqa: C901
@@ -565,8 +571,7 @@ def _write_metadata(  # noqa: C901
         if self.description:
             smart_message["Summary"] = self.description
         smart_message["Keywords"] = ",".join(self.keywords) or None
-        if "homepage" in self.urls:
-            smart_message["Home-page"] = self.urls["homepage"]
+        # skip 'Home-page'
         # skip 'Download-URL'
         smart_message["Author"] = _name_list(self.authors)
         smart_message["Author-Email"] = _email_list(self.authors)
@@ -588,7 +593,7 @@ def _write_metadata(  # noqa: C901
         # skip 'Obsoletes-Dist'
         # skip 'Requires-External'
         for name, url in self.urls.items():
-            smart_message["Project-URL"] = f"{name.capitalize()}, {url}"
+            smart_message["Project-URL"] = f"{name}, {url}"
         if self.requires_python:
             smart_message["Requires-Python"] = str(self.requires_python)
         for dep in self.dependencies:

pyproject_metadata/constants.py

@@ -58,9 +58,9 @@ def __dir__() -> list[str]:
     "classifier",
     "description",
     "description-content-type",
-    "download-url",  # Not specified via pyproject standards
+    "download-url",  # Not specified via pyproject standards, deprecated by PEP 753
     "dynamic",  # Can't be in dynamic
-    "home-page",  # Not specified via pyproject standards
+    "home-page",  # Not specified via pyproject standards, deprecated by PEP 753
     "keywords",
     "license",
     "license-expression",

tests/test_standard_metadata.py

@@ -590,9 +590,9 @@ def all_errors(request: pytest.FixtureRequest, monkeypatch: pytest.MonkeyPatch)
                 name = "test"
                 version = "0.1.0"
                 [project.urls]
-                documentation = true
+                Documentation = true
             """,
-            'Field "project.urls.documentation" has an invalid type, expecting a string (got bool)',
+            'Field "project.urls.Documentation" has an invalid type, expecting a string (got bool)',
             id="Invalid urls documentation type",
         ),
         pytest.param(
@@ -606,6 +606,17 @@ def all_errors(request: pytest.FixtureRequest, monkeypatch: pytest.MonkeyPatch)
             'Field "project.urls.repository" has an invalid type, expecting a string (got bool)',
             id="Invalid urls repository type",
         ),
+        pytest.param(
+            """
+                [project]
+                name = "test"
+                version = "0.1.0"
+                [project.urls]
+                "I am really really too long for this place" = "url"
+            """,
+            "\"project.urls\" names cannot be more than 32 characters long (got 'I am really really too long for this place')",
+            id="URL name too long",
+        ),
         pytest.param(
             """
                 [project]
@@ -1097,17 +1108,16 @@ def test_as_json(monkeypatch: pytest.MonkeyPatch) -> None:
         ],
         "description": "some readme 👋\n",
         "description_content_type": "text/markdown",
-        "home_page": "example.com",
         "keywords": ["trampolim", "is", "interesting"],
         "license": "some license text",
         "maintainer_email": "Other Example <[email protected]>",
         "metadata_version": "2.1",
         "name": "full_metadata",
         "project_url": [
-            "Homepage, example.com",
-            "Documentation, readthedocs.org",
-            "Repository, github.com/some/repo",
-            "Changelog, github.com/some/repo/blob/master/CHANGELOG.rst",
+            "homepage, example.com",
+            "documentation, readthedocs.org",
+            "repository, github.com/some/repo",
+            "changelog, github.com/some/repo/blob/master/CHANGELOG.rst",
         ],
         "provides_extra": ["test"],
         "requires_dist": [
@@ -1138,17 +1148,16 @@ def test_as_rfc822(monkeypatch: pytest.MonkeyPatch) -> None:
         ("Version", "3.2.1"),
         ("Summary", "A package with all the metadata :)"),
         ("Keywords", "trampolim,is,interesting"),
-        ("Home-page", "example.com"),
         ("Author", "Example!"),
         ("Author-Email", "Unknown <[email protected]>"),
         ("Maintainer-Email", "Other Example <[email protected]>"),
         ("License", "some license text"),
         ("Classifier", "Development Status :: 4 - Beta"),
         ("Classifier", "Programming Language :: Python"),
-        ("Project-URL", "Homepage, example.com"),
-        ("Project-URL", "Documentation, readthedocs.org"),
-        ("Project-URL", "Repository, github.com/some/repo"),
-        ("Project-URL", "Changelog, github.com/some/repo/blob/master/CHANGELOG.rst"),
+        ("Project-URL", "homepage, example.com"),
+        ("Project-URL", "documentation, readthedocs.org"),
+        ("Project-URL", "repository, github.com/some/repo"),
+        ("Project-URL", "changelog, github.com/some/repo/blob/master/CHANGELOG.rst"),
         ("Requires-Python", ">=3.8"),
         ("Requires-Dist", "dependency1"),
         ("Requires-Dist", "dependency2>1.0.0"),