Move metadata to setup.cfg; also use this for pytest configuration

This makes it possible to run pytest in the root directory.  It also lets us store metadata such as the current version number, preventing us from having this in several different places, and allowing us to phase out parsing dtool/PandaVersion.pp.

makepanda/makepanda.py

@@ -367,7 +367,8 @@ if VERSION is None:
     if RUNTIME:
         VERSION = PLUGIN_VERSION
     else:
-        VERSION = ParsePandaVersion("dtool/PandaVersion.pp")
+        # Take the value from the setup.cfg file.
+        VERSION = GetMetadataValue('version')
 
 if WHLVERSION is None:
     WHLVERSION = VERSION

makepanda/makepandacore.py

@@ -12,9 +12,11 @@ from distutils import sysconfig
 if sys.version_info >= (3, 0):
     import pickle
     import _thread as thread
+    import configparser
 else:
     import cPickle as pickle
     import thread
+    import ConfigParser as configparser
 
 SUFFIX_INC = [".cxx",".cpp",".c",".h",".I",".yxx",".lxx",".mm",".rc",".r"]
 SUFFIX_DLL = [".dll",".dlo",".dle",".dli",".dlm",".mll",".exe",".pyd",".ocx"]
@@ -2849,6 +2851,21 @@ def CopyPythonTree(dstdir, srcdir, lib2to3_fixers=[], threads=0):
 ##
 ########################################################################
 
+cfg_parser = None
+
+def GetMetadataValue(key):
+    global cfg_parser
+    if not cfg_parser:
+        # Parse the metadata from the setup.cfg file.
+        cfg_parser = configparser.ConfigParser()
+        cfg_parser.read('setup.cfg')
+
+    value = cfg_parser.get('metadata', key)
+    if key == 'classifiers':
+        value = value.strip().split('\n')
+    return value
+
+# This function is being phased out.
 def ParsePandaVersion(fn):
     try:
         f = open(fn, "r")

makepanda/makewheel.py

@@ -20,7 +20,7 @@ import tempfile
 import subprocess
 from distutils.sysconfig import get_config_var
 from optparse import OptionParser
-from makepandacore import ColorText, LocateBinary, ParsePandaVersion, GetExtensionSuffix, SetVerbose, GetVerbose
+from makepandacore import ColorText, LocateBinary, ParsePandaVersion, GetExtensionSuffix, SetVerbose, GetVerbose, GetMetadataValue
 from base64 import urlsafe_b64encode
 
 
@@ -103,16 +103,15 @@ Tag: {0}-{1}-{2}
 """
 
 METADATA = {
-    "license": "BSD",
-    "name": "Panda3D",
+    "license": GetMetadataValue('license'),
+    "name": GetMetadataValue('name'),
     "metadata_version": "2.0",
     "generator": "makepanda",
-    "summary": "Panda3D is a game engine, a framework for 3D rendering and "
-               "game development for Python and C++ programs.",
+    "summary": GetMetadataValue('description'),
     "extensions": {
         "python.details": {
             "project_urls": {
-                "Home": "https://www.panda3d.org/"
+                "Home": GetMetadataValue('url'),
             },
             "document_names": {
                 "license": "LICENSE.txt"
@@ -120,25 +119,13 @@ METADATA = {
             "contacts": [
                 {
                     "role": "author",
-                    "email": "etc-panda3d@lists.andrew.cmu.edu",
-                    "name": "Panda3D Team"
+                    "name": GetMetadataValue('author'),
+                    "email": GetMetadataValue('author_email'),
                 }
             ]
         }
     },
-    "classifiers": [
-        "Development Status :: 5 - Production/Stable",
-        "Intended Audience :: Developers",
-        "Intended Audience :: End Users/Desktop",
-        "License :: OSI Approved :: BSD License",
-        "Operating System :: OS Independent",
-        "Programming Language :: C++",
-        "Programming Language :: Python",
-        "Topic :: Games/Entertainment",
-        "Topic :: Multimedia",
-        "Topic :: Multimedia :: Graphics",
-        "Topic :: Multimedia :: Graphics :: 3D Rendering"
-    ]
+    "classifiers": GetMetadataValue('classifiers'),
 }
 
 PANDA3D_TOOLS_INIT = """import os, sys

setup.cfg

@@ -0,0 +1,24 @@
+[metadata]
+name = Panda3D
+version = 1.10.0
+url = https://www.panda3d.org/
+description = Panda3D is a framework for 3D rendering and game development for Python and C++ programs.
+license = Modified BSD License
+license_file = LICENSE
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Intended Audience :: Developers
+    Intended Audience :: End Users/Desktop
+    License :: OSI Approved :: BSD License
+    Operating System :: OS Independent
+    Programming Language :: C++
+    Programming Language :: Python
+    Topic :: Games/Entertainment
+    Topic :: Multimedia
+    Topic :: Multimedia :: Graphics
+    Topic :: Multimedia :: Graphics :: 3D Rendering
+author = Panda3D Team
+author_email = etc-panda3d@lists.andrew.cmu.edu
+
+[tool:pytest]
+testpaths = tests