Switch to declarative setup.py metadata

Switches #3526

setup.cfg

@@ -0,0 +1,49 @@
+[metadata]
+packages = find:
+name = qutebrowser
+version = attr: qutebrowser.__version__
+description = A keyboard-driven, vim-like browser based on PyQt5.
+long_description = file:README.asciidoc
+long_description_content_type = text/plain
+url = https://www.qutebrowser.org/
+author = Florian Bruhin
+author_email = mail@qutebrowser.org
+license = GPL
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Environment :: X11 Applications :: Qt
+    Intended Audience :: End Users/Desktop
+    License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
+    Natural Language :: English
+    Operating System :: Microsoft :: Windows
+    Operating System :: POSIX :: Linux
+    Operating System :: MacOS
+    Operating System :: POSIX :: BSD
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Topic :: Internet
+    Topic :: Internet :: WWW/HTTP
+    Topic :: Internet :: WWW/HTTP :: Browsers
+keywords = pyqt, browser, web, qt, webkit, qtwebkit, qtwebengine
+
+[options]
+include_package_data = True
+zip_safe = True
+install_requires =
+    jinja2
+    PyYAML
+    dataclasses; python_version < "3.7"
+    importlib_resources>=1.1.0; python_version < "3.9"
+python_requires = >= 3.6
+
+[options.packages.find]
+exclude =
+    scripts
+    scripts.*
+
+[options.entry_points]
+gui_scripts =
+    qutebrowser = qutebrowser.qutebrowser:main

setup.py

@@ -21,8 +21,6 @@
 
 """setuptools installer script for qutebrowser."""
 
-import re
-import ast
 import os
 import os.path
 
@@ -37,75 +35,9 @@ except NameError:
     BASEDIR = None
 
 
-def read_file(name):
-    """Get the string contained in the file named name."""
-    with common.open_file(name, 'r', encoding='utf-8') as f:
-        return f.read()
-
-
-def _get_constant(name):
-    """Read a __magic__ constant from qutebrowser/__init__.py.
-
-    We don't import qutebrowser here because it can go wrong for multiple
-    reasons. Instead we use re/ast to get the value directly from the source
-    file.
-
-    Args:
-        name: The name of the argument to get.
-
-    Return:
-        The value of the argument.
-    """
-    field_re = re.compile(r'__{}__\s+=\s+(.*)'.format(re.escape(name)))
-    path = os.path.join(BASEDIR, 'qutebrowser', '__init__.py')
-    line = field_re.search(read_file(path)).group(1)
-    value = ast.literal_eval(line)
-    return value
-
-
 try:
     common.write_git_file()
-    setuptools.setup(
-        packages=setuptools.find_packages(exclude=['scripts', 'scripts.*']),
-        include_package_data=True,
-        entry_points={'gui_scripts':
-                      ['qutebrowser = qutebrowser.qutebrowser:main']},
-        zip_safe=True,
-        install_requires=['jinja2', 'PyYAML',
-                          'dataclasses; python_version < "3.7"',
-                          'importlib_resources>=1.1.0; python_version < "3.9"'],
-        python_requires='>=3.6',
-        name='qutebrowser',
-        version=_get_constant('version'),
-        description=_get_constant('description'),
-        long_description=read_file('README.asciidoc'),
-        long_description_content_type='text/plain',
-        url='https://www.qutebrowser.org/',
-        author=_get_constant('author'),
-        author_email=_get_constant('email'),
-        license=_get_constant('license'),
-        classifiers=[
-            'Development Status :: 5 - Production/Stable',
-            'Environment :: X11 Applications :: Qt',
-            'Intended Audience :: End Users/Desktop',
-            'License :: OSI Approved :: GNU General Public License v3 or later '
-                '(GPLv3+)',
-            'Natural Language :: English',
-            'Operating System :: Microsoft :: Windows',
-            'Operating System :: POSIX :: Linux',
-            'Operating System :: MacOS',
-            'Operating System :: POSIX :: BSD',
-            'Programming Language :: Python :: 3',
-            'Programming Language :: Python :: 3.6',
-            'Programming Language :: Python :: 3.7',
-            'Programming Language :: Python :: 3.8',
-            'Programming Language :: Python :: 3.9',
-            'Topic :: Internet',
-            'Topic :: Internet :: WWW/HTTP',
-            'Topic :: Internet :: WWW/HTTP :: Browsers',
-        ],
-        keywords='pyqt browser web qt webkit qtwebkit qtwebengine',
-    )
+    setuptools.setup()  # data is in setup.cfg
 finally:
     if BASEDIR is not None:
         path = os.path.join(BASEDIR, 'qutebrowser', 'git-commit-id')