Configure setuptools using the declarative syntax in setup.cfg (#239)

This approach avoids mixing code with configuration and therefore
requires less custom code at build-time and installation-time. Removing
this custom setup.py code reduces cross-project boilerplate.

https://setuptools.readthedocs.io/en/latest/userguide/declarative_config.html

setup.cfg

@@ -1,3 +1,44 @@
+[metadata]
+name = chardet
+version = attr: chardet.__version__
+description = Universal encoding detector for Python 3
+long_description = file: README.rst
+author = Mark Pilgrim
+author_email = mark@diveintomark.org
+maintainer = Daniel Blanchard
+maintainer_email = dan.blanchard@gmail.com
+url = https://github.com/chardet/chardet
+license = LGPL
+keywords = encoding, i18n, xml
+project_urls =
+    Documentation = https://chardet.readthedocs.io/
+    GitHub Project = https://github.com/chardet/chardet
+    Issue Tracker = https://github.com/chardet/chardet/issues
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Intended Audience :: Developers
+    License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: Implementation :: CPython
+    Programming Language :: Python :: Implementation :: PyPy
+    Topic :: Software Development :: Libraries :: Python Modules
+    Topic :: Text Processing :: Linguistic
+
+[options]
+python_requires = >=3.6
+packages = find:
+
+[options.entry_points]
+console_scripts =
+    chardetect = chardet.cli.chardetect:main
+
 [tool:pytest]
 addopts = -v
 python_files = test.py

setup.py

@@ -1,56 +1,3 @@
-from setuptools import find_packages, setup
+from setuptools import setup
 
-
-# Get version without importing, which avoids dependency issues
-def get_version():
-    import re
-
-    with open("chardet/version.py") as version_file:
-        return re.search(
-            r"""__version__\s+=\s+(['"])(?P<version>.+?)\1""", version_file.read()
-        ).group("version")
-
-
-def readme():
-    with open("README.rst") as f:
-        return f.read()
-
-
-setup(
-    name="chardet",
-    version=get_version(),
-    description="Universal encoding detector for Python 3",
-    long_description=readme(),
-    author="Mark Pilgrim",
-    author_email="mark@diveintomark.org",
-    maintainer="Daniel Blanchard",
-    maintainer_email="dan.blanchard@gmail.com",
-    url="https://github.com/chardet/chardet",
-    license="LGPL",
-    keywords=["encoding", "i18n", "xml"],
-    project_urls={
-        "Documentation": "https://chardet.readthedocs.io/",
-        "GitHub Project": "https://github.com/chardet/chardet",
-        "Issue Tracker": "https://github.com/chardet/chardet/issues",
-    },
-    classifiers=[
-        "Development Status :: 5 - Production/Stable",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: Implementation :: CPython",
-        "Programming Language :: Python :: Implementation :: PyPy",
-        "Topic :: Software Development :: Libraries :: Python Modules",
-        "Topic :: Text Processing :: Linguistic",
-    ],
-    packages=find_packages(),
-    python_requires=">=3.6",
-    entry_points={"console_scripts": ["chardetect = chardet.cli.chardetect:main"]},
-)
+setup()