Add support for `license_files` specified in `setup.py` (#466)

Wheel now leans on setuptools to provide the necessary information.

4 files changed, 29 insertions, 58 deletions

diff --git a/docs/news.rst b/docs/news.rst
index aa46010..d348b87 100644
--- a/docs/news.rst
+++ b/docs/news.rst
@@ -6,6 +6,9 @@ Release Notes
 - Dropped support for Python < 3.7
 - Updated vendored ``packaging`` to 21.3
 - Replaced all uses of ``distutils`` with ``setuptools``
+- The handling of ``license_files`` (including glob patterns and default
+  values) is now delegated to ``setuptools>=57.0.0`` (#466).
+  The package dependencies were updated to reflect this change.
 
 **0.37.1 (2021-12-22)**
 
diff --git a/setup.cfg b/setup.cfg
index 1b71a18..75079a2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -31,7 +31,7 @@ package_dir=
     = src
 packages = find:
 python_requires = >=3.7
-install_requires = setuptools >= 45.2.0
+install_requires = setuptools >= 57.0.0
 zip_safe = False
 
 [options.packages.find]
diff --git a/src/wheel/bdist_wheel.py b/src/wheel/bdist_wheel.py
index 929864e..7cbd140 100644
--- a/src/wheel/bdist_wheel.py
+++ b/src/wheel/bdist_wheel.py
@@ -15,7 +15,6 @@ import sysconfig
 import warnings
 from collections import OrderedDict
 from email.generator import BytesGenerator, Generator
-from glob import iglob
 from io import BytesIO
 from shutil import rmtree
 from sysconfig import get_config_var
@@ -432,38 +431,8 @@ class bdist_wheel(Command):
 
     @property
     def license_paths(self):
-        metadata = self.distribution.get_option_dict("metadata")
-        files = set()
-        patterns = sorted(
-            {option for option in metadata.get("license_files", ("", ""))[1].split()}
-        )
-
-        if "license_file" in metadata:
-            warnings.warn(
-                'The "license_file" option is deprecated. Use '
-                '"license_files" instead.',
-                DeprecationWarning,
-            )
-            files.add(metadata["license_file"][1])
-
-        if "license_file" not in metadata and "license_files" not in metadata:
-            patterns = ("LICEN[CS]E*", "COPYING*", "NOTICE*", "AUTHORS*")
-
-        for pattern in patterns:
-            for path in iglob(pattern):
-                if path.endswith("~"):
-                    log.debug(
-                        f'ignoring license file "{path}" as it looks like a ' f"backup"
-                    )
-                    continue
-
-                if path not in files and os.path.isfile(path):
-                    log.info(
-                        f'adding license file "{path}" (matched pattern "{pattern}")'
-                    )
-                    files.add(path)
-
-        return files
+        metadata = self.distribution.metadata
+        return sorted(metadata.license_files or [])
 
     def egg2dist(self, egginfo_path, distinfo_path):
         """Convert an .egg-info directory into a .dist-info directory"""
diff --git a/tests/test_bdist_wheel.py b/tests/test_bdist_wheel.py
index 981a21f..5ed9a41 100644
--- a/tests/test_bdist_wheel.py
+++ b/tests/test_bdist_wheel.py
@@ -34,21 +34,20 @@ OTHER_IGNORED_FILES = {
     "LICENSE~",
     "AUTHORS~",
 }
-
-
-@pytest.fixture
-def dummy_dist(tmpdir_factory):
-    basedir = tmpdir_factory.mktemp("dummy_dist")
-    basedir.join("setup.py").write(
-        """\
+SETUPPY_EXAMPLE = """\
 from setuptools import setup
 
 setup(
     name='dummy_dist',
-    version='1.0'
+    version='1.0',
 )
 """
-    )
+
+
+@pytest.fixture
+def dummy_dist(tmpdir_factory):
+    basedir = tmpdir_factory.mktemp("dummy_dist")
+    basedir.join("setup.py").write(SETUPPY_EXAMPLE)
     for fname in DEFAULT_LICENSE_FILES | OTHER_IGNORED_FILES:
         basedir.join(fname).write("")
 
@@ -83,21 +82,21 @@ def test_licenses_default(dummy_dist, monkeypatch, tmpdir):
         assert set(wf.namelist()) == DEFAULT_FILES | license_files
 
 
-def test_licenses_deprecated(dummy_dist, monkeypatch, tmpdir):
-    dummy_dist.join("setup.cfg").write("[metadata]\nlicense_file=licenses/DUMMYFILE")
-    monkeypatch.chdir(dummy_dist)
-    subprocess.check_call(
-        [sys.executable, "setup.py", "bdist_wheel", "-b", str(tmpdir), "--universal"]
-    )
-    with WheelFile("dist/dummy_dist-1.0-py2.py3-none-any.whl") as wf:
-        license_files = {"dummy_dist-1.0.dist-info/DUMMYFILE"}
-        assert set(wf.namelist()) == DEFAULT_FILES | license_files
-
-
-def test_licenses_override(dummy_dist, monkeypatch, tmpdir):
-    dummy_dist.join("setup.cfg").write(
-        "[metadata]\nlicense_files=licenses/*\n  LICENSE"
-    )
+@pytest.mark.parametrize(
+    "config_file, config",
+    [
+        ("setup.cfg", "[metadata]\nlicense_files=licenses/*\n  LICENSE"),
+        ("setup.cfg", "[metadata]\nlicense_files=licenses/*, LICENSE"),
+        (
+            "setup.py",
+            SETUPPY_EXAMPLE.replace(
+                ")", "  license_files=['licenses/DUMMYFILE', 'LICENSE'])"
+            ),
+        ),
+    ],
+)
+def test_licenses_override(dummy_dist, monkeypatch, tmpdir, config_file, config):
+    dummy_dist.join(config_file).write(config)
     monkeypatch.chdir(dummy_dist)
     subprocess.check_call(
         [sys.executable, "setup.py", "bdist_wheel", "-b", str(tmpdir), "--universal"]