Change packaging to use setuptools declarative config in setup.cfg

setup.cfg

@@ -1,3 +1,50 @@
+[metadata]
+name = channels
+version = attr: channels.__version__
+url = https://github.com/django/channels
+author = Django Software Foundation
+author_email = foundation@djangoproject.com
+description = Brings async, event-driven capabilities to Django. Django 2.2 and up only.
+long_description = file: README.rst
+license = BSD
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Environment :: Web Environment
+    Framework :: Django
+    Intended Audience :: Developers
+    License :: OSI Approved :: BSD License
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Topic :: Internet :: WWW/HTTP
+
+[options]
+python_requires = >=3.5
+packages = find:
+include_package_data = true
+install_requires =
+    Django >= 2.2
+    asgiref ~= 3.2
+    daphne ~= 2.3
+
+[options.packages.find]
+exclude =
+    tests
+
+[options.extras_require]
+tests =
+    pytest ~= 4.4
+    pytest-django ~= 3.4
+    pytest-asyncio ~= 0.10
+    async_generator ~= 1.10
+    async-timeout ~= 3.0
+    coverage ~= 4.5
+
 [flake8]
 exclude = venv/*,tox/*,docs/*,testproject/*,build/*
 ignore = E123,E128,E266,E402,W503,E731,W601

setup.py

@@ -1,45 +1,3 @@
-from setuptools import find_packages, setup
-from channels import __version__
+from setuptools import setup
 
-setup(
-    name='channels',
-    version=__version__,
-    url='http://github.com/django/channels',
-    author='Django Software Foundation',
-    author_email='foundation@djangoproject.com',
-    description="Brings async, event-driven capabilities to Django. Django 2.2 and up only.",
-    license='BSD',
-    packages=find_packages(exclude=['tests']),
-    include_package_data=True,
-    python_requires='>=3.5',
-    install_requires=[
-        'Django>=2.2',
-        'asgiref~=3.2',
-        'daphne~=2.3',
-    ],
-    extras_require={
-        'tests': [
-            'pytest~=4.4',
-            "pytest-django~=3.4",
-            "pytest-asyncio~=0.10",
-            "async_generator~=1.10",
-            "async-timeout~=3.0",
-            'coverage~=4.5',
-        ],
-    },
-    classifiers=[
-        'Development Status :: 5 - Production/Stable',
-        'Environment :: Web Environment',
-        'Framework :: Django',
-        'Intended Audience :: Developers',
-        'License :: OSI Approved :: BSD License',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
-        'Topic :: Internet :: WWW/HTTP',
-    ],
-)
+setup()