Support PEP 345 Project-URL metadata

By including one or more Project-URL entries in PKG-INFO metadata,
PyPI can display helpful hyperlinks in a generic manner. Add support
here to be able to pass it through setup.cfg with a project_urls
dict. See the corresponding section of the Core Metadata
Specifications from the Python Packaging User Guide for details:

https://packaging.python.org/specifications/core-metadata/#project-url-multiple-use

Setuptools implementation is underway here:

    https://github.com/pypa/setuptools/pull/1210

Change-Id: I14e580c654b619cab7eb24e31f736056d6cf9bd4

doc/source/user/using.rst

@@ -52,6 +52,10 @@ itself):
     summary = OpenStack's setup automation in a reusable form
     description-file = README
     home-page = https://launchpad.net/pbr
+    project_urls =
+        Bug Tracker = https://bugs.launchpad.net/pbr/
+        Documentation = https://docs.openstack.org/pbr/
+        Source Code = https://git.openstack.org/cgit/openstack-dev/pbr/
     license = Apache-2
     classifier =
         Development Status :: 4 - Beta

pbr/tests/testpackage/setup.cfg

@@ -6,6 +6,10 @@ version = 0.1.dev
 author = OpenStack
 author-email = openstack-dev@lists.openstack.org
 home-page = http://pypi.python.org/pypi/pbr
+project_urls =
+    Bug Tracker = https://bugs.launchpad.net/pbr/
+    Documentation = https://docs.openstack.org/pbr/
+    Source Code = https://git.openstack.org/cgit/openstack-dev/pbr/
 summary = Test package for testing pbr
 description-file =
     README.txt

pbr/util.py

@@ -101,6 +101,7 @@ D1_D2_SETUP_ARGS = {
     "maintainer": ("metadata",),
     "maintainer_email": ("metadata",),
     "url": ("metadata", "home_page"),
+    "project_urls": ("metadata",),
     "description": ("metadata", "summary"),
     "keywords": ("metadata",),
     "long_description": ("metadata", "description"),
@@ -148,6 +149,9 @@ MULTI_FIELDS = ("classifiers",
                 "tests_require",
                 "cmdclass")
 
+# setup() arguments that can have mapping values in setup.cfg
+MAP_FIELDS = ("project_urls",)
+
 # setup() arguments that contain boolean values
 BOOL_FIELDS = ("use_2to3", "zip_safe", "include_package_data")
 
@@ -321,6 +325,12 @@ def setup_cfg_to_setup_kwargs(config, script_args=()):
             in_cfg_value = split_csv(in_cfg_value)
         if arg in MULTI_FIELDS:
             in_cfg_value = split_multiline(in_cfg_value)
+        elif arg in MAP_FIELDS:
+            in_cfg_map = {}
+            for i in split_multiline(in_cfg_value):
+                k, v = i.split('=')
+                in_cfg_map[k.strip()] = v.strip()
+            in_cfg_value = in_cfg_map
         elif arg in BOOL_FIELDS:
             # Provide some flexibility here...
             if in_cfg_value.lower() in ('true', 't', '1', 'yes', 'y'):

setup.cfg

@@ -6,6 +6,10 @@ summary = Python Build Reasonableness
 description-file =
     README.rst
 home-page = https://docs.openstack.org/pbr/latest/
+project_urls =
+    Bug Tracker = https://bugs.launchpad.net/pbr/
+    Documentation = https://docs.openstack.org/pbr/
+    Source Code = https://git.openstack.org/cgit/openstack-dev/pbr/
 requires-python = >=2.6
 classifier =
         Development Status :: 5 - Production/Stable