Implement PEP 440 by using the packaging library

1 files changed, 21 insertions, 0 deletions

diff --git a/setuptools/dist.py b/setuptools/dist.py
index 8b36f67c..ae4ff554 100644
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -15,6 +15,7 @@ from distutils.errors import (DistutilsOptionError, DistutilsPlatformError,
 
 from setuptools.depends import Require
 from setuptools.compat import basestring, PY2
+from setuptools._vendor.packaging.version import Version, InvalidVersion
 import pkg_resources
 
 def _get_unpatched(cls):
@@ -268,6 +269,26 @@ class Distribution(_Distribution):
             # Some people apparently take "version number" too literally :)
             self.metadata.version = str(self.metadata.version)
 
+        if self.metadata.version is not None:
+            try:
+                normalized_version = str(Version(self.metadata.version))
+                if self.metadata.version != normalized_version:
+                    warnings.warn(
+                        "The version specified requires normalization, "
+                        "consider using '%s' instead of '%s'." % (
+                            normalized_version,
+                            self.metadata.version,
+                        )
+                    )
+                    self.metadata.version = normalized_version
+            except (InvalidVersion, TypeError):
+                warnings.warn(
+                    "The version specified (%r) is an invalid version, this "
+                    "may not work as expected with newer versions of "
+                    "setuptools, pip, and PyPI. Please see PEP 440 for more "
+                    "details." % self.metadata.version
+                )
+
     def parse_command_line(self):
         """Process features after parsing command line options"""
         result = _Distribution.parse_command_line(self)