Add implementation for automatic config discovery

1 files changed, 11 insertions, 0 deletions

diff --git a/setuptools/dist.py b/setuptools/dist.py
index e825785e..79be2cdf 100644
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -39,6 +39,8 @@ import setuptools.command
 from setuptools import windows_support
 from setuptools.monkey import get_unpatched
 from setuptools.config import parse_configuration
+from setuptools.discovery import ConfigDiscovery
+
 import pkg_resources
 from setuptools.extern.packaging import version, requirements
 from . import _reqs
@@ -464,6 +466,8 @@ class Distribution(_Distribution):
             },
         )
 
+        self.set_defaults = ConfigDiscovery(self)
+
         self._set_metadata_defaults(attrs)
 
         self.metadata.version = self._normalize_version(
@@ -1186,6 +1190,13 @@ class Distribution(_Distribution):
                 sys.stdout.detach(), encoding, errors, newline, line_buffering
             )
 
+    def run_command(self, command):
+        self.set_defaults()
+        # Postpone defaults until all explicit configuration is considered
+        # (setup() args, config files, command line and plugins)
+
+        super().run_command(command)
+
 
 class DistDeprecationWarning(SetuptoolsDeprecationWarning):
     """Class for warning about deprecations in dist in