Implement "entry points" for dynamic discovery of drivers and plugins.

Change setuptools to discover setup commands using an entry point group
called "distutils.commands".  Thanks to Ian Bicking for the suggestion that
led to designing this super-cool feature.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4041152

2 files changed, 22 insertions, 29 deletions

diff --git a/setuptools/command/__init__.py b/setuptools/command/__init__.py
index 29f3000d..a58b5344 100644
--- a/setuptools/command/__init__.py
+++ b/setuptools/command/__init__.py
@@ -1,17 +1,10 @@
-import distutils.command
-
 __all__ = [
-    'test', 'develop', 'bdist_egg', 'saveopts', 'setopt', 'rotate', 'alias'
+    'alias', 'bdist_egg', 'build_ext', 'build_py', 'depends', 'develop',
+    'easy_install', 'egg_info', 'install', 'install_lib', 'rotate', 'saveopts',
+    'sdist', 'setopt', 'test', 'upload',
 ]
 
 
-# Make our commands available as though they were part of the distutils
-
-distutils.command.__path__.extend(__path__)
-distutils.command.__all__.extend(
-    [cmd for cmd in __all__ if cmd not in distutils.command.__all__]
-    )
-
 from distutils.command.bdist import bdist
 
 if 'egg' not in bdist.format_commands:
diff --git a/setuptools/command/egg_info.py b/setuptools/command/egg_info.py
index a5418568..8577230f 100755
--- a/setuptools/command/egg_info.py
+++ b/setuptools/command/egg_info.py
@@ -8,7 +8,7 @@ from setuptools import Command
 from distutils.errors import *
 from distutils import log
 from pkg_resources import parse_requirements, safe_name, \
-    safe_version, yield_lines
+    safe_version, yield_lines, EntryPoint
 from setuptools.dist import iter_distribution_names
 
 class egg_info(Command):
@@ -95,7 +95,7 @@ class egg_info(Command):
                 metadata.write_pkg_info(self.egg_info)
             finally:
                 metadata.name, metadata.version = oldname, oldver
-
+        self.write_entry_points()
         self.write_requirements()
         self.write_toplevel_names()
         self.write_or_delete_dist_arg('namespace_packages')
@@ -183,23 +183,23 @@ class egg_info(Command):
             if not self.dry_run:
                 os.unlink(filename)
 
+    def write_entry_points(self):
+        ep = getattr(self.distribution,'entry_points',None)
+        if ep is None:
+            return
 
+        epname = os.path.join(self.egg_info,"entry_points.txt")
+        log.info("writing %s", epname)
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+        if not self.dry_run:
+            f = open(epname, 'wt')
+            if isinstance(ep,basestring):
+                f.write(ep)
+            else:
+                for section, contents in ep.items():
+                    if not isinstance(contents,basestring):
+                        contents = EntryPoint.parse_list(section, contents)
+                        contents = '\n'.join(map(str,contents.values()))
+                    f.write('[%s]\n%s\n\n' % (section,contents))
+            f.close()