Setup: add universal wheel; update metadata; clean up setup.py

* Follow current setup.py recommendations from the pypa sample project
  (utf-8 encoding on file reads, ensure files are read relative to
  own location)
* Add/update some missing classifiers and other metadata
* Read _version.py constants into an isolated dict (rather than
  the global setup.py context)
* Add setup.cfg specifying universal bdist_wheel

.gitignore

@@ -3,6 +3,7 @@
 *.pyc
 *.egg
 *.egg-info
+build/
 dist/
 docs/_build/
 local.py

anymail/_version.py

@@ -1,3 +1,3 @@
-VERSION = (1, 4)
+VERSION = (2, 0, 0, 'dev5')
 __version__ = '.'.join([str(x) for x in VERSION])  # major.minor.patch or major.minor.devN
 __minor_version__ = '.'.join([str(x) for x in VERSION[:2]])  # Sphinx's X.Y "version"

setup.cfg

@@ -0,0 +1,5 @@
+[metadata]
+license_file = LICENSE
+
+[bdist_wheel]
+universal=1

setup.py

@@ -1,37 +1,42 @@
-from setuptools import setup
 import re
+from codecs import open  # to use a consistent encoding
+from collections import OrderedDict
+from os import path
+from setuptools import setup
 
-# define __version__ and __minor_version__ from anymail/_version.py,
+here = path.abspath(path.dirname(__file__))
+
+# get versions from anymail/_version.py,
 # but without importing from anymail (which would break setup)
-__version__ = "UNSET"
+with open(path.join(here, "anymail/_version.py"), encoding='utf-8') as f:
-__minor_version__ = "UNSET"
-with open("anymail/_version.py") as f:
     code = compile(f.read(), "anymail/_version.py", 'exec')
-    exec(code)
+    _version = {}
+    exec(code, _version)
+    version = _version["__version__"]  # X.Y or X.Y.Z or X.Y.Z.dev1 etc.
+    release_tag = "v%s" % version  # vX.Y or vX.Y.Z
 
 
 def long_description_from_readme(rst):
     # Freeze external links (on PyPI) to refer to this X.Y or X.Y.Z tag.
     # (This relies on tagging releases with 'vX.Y' or 'vX.Y.Z' in GitHub.)
-    release = 'v%s' % __version__  # vX.Y or vX.Y.Z
     rst = re.sub(r'(?<=branch=)master'     # Travis build status: branch=master --> branch=vX.Y.Z
                  r'|(?<=/)stable'          # ReadTheDocs links: /stable --> /vX.Y.Z
                  r'|(?<=version=)stable',  # ReadTheDocs badge: version=stable --> version=vX.Y.Z
-                 release, rst)  # (?<=...) is "positive lookbehind": must be there, but won't get replaced
+                 release_tag, rst)  # (?<=...) is "positive lookbehind": must be there, but won't get replaced
     return rst
 
 
-with open('README.rst') as f:
+with open(path.join(here, 'README.rst'), encoding='utf-8') as f:
     long_description = long_description_from_readme(f.read())
 
 
 setup(
     name="django-anymail",
-    version=__version__,
+    version=version,
     description='Django email backends for Mailgun, Mailjet, Postmark, SendGrid, SparkPost '
                 'and other transactional ESPs',
     keywords="django, email, email backend, ESP, transactional mail, mailgun, mailjet, mandrill, postmark, sendgrid",
-    author="Mike Edmunds <medmunds@gmail.com>",
+    author="Mike Edmunds and Anymail contributors",
     author_email="medmunds@gmail.com",
     url="https://github.com/anymail/django-anymail",
     license="BSD License",
@@ -57,15 +62,29 @@ setup(
         "Programming Language :: Python",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Programming Language :: Python :: Implementation :: CPython",
+        "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "License :: OSI Approved :: BSD License",
+        "Topic :: Communications :: Email",
         "Topic :: Software Development :: Libraries :: Python Modules",
+        "Intended Audience :: Developers",
         "Framework :: Django",
+        "Framework :: Django :: 1.8",
+        "Framework :: Django :: 1.9",
+        "Framework :: Django :: 1.10",
+        "Framework :: Django :: 1.11",
+        "Framework :: Django :: 2.0",
         "Environment :: Web Environment",
     ],
     long_description=long_description,
+    project_urls=OrderedDict([
+        ("Documentation", "https://anymail.readthedocs.io/en/%s/" % release_tag),
+        ("Source", "https://github.com/anymail/django-anymail"),
+        ("Changelog", "https://github.com/anymail/django-anymail/releases"),
+        ("Tracker", "https://github.com/anymail/django-anymail/issues"),
+    ]),
 )