zc.recipe.egg: Improve on the fly pathces.

Now specified patches are automatically applied on required eggs as well.

src/zc/buildout/easy_install.py

@@ -843,6 +843,8 @@ class Installer:
                 else:
                     logger.debug('Adding required %r', str(req))
                 self._log_requirement(ws, req)
+                self._env.scan(
+                    self.build(str(req), {}, patch_dict=patch_dict))
                 for dist in self._get_dist(req, ws,
                                            for_buildout_run=for_buildout_run):
                     ws.add(dist)

zc.recipe.egg_/src/zc/recipe/egg/egg.py

@@ -51,17 +51,21 @@ class Eggs(object):
         options['develop-eggs-directory'] = b_options['develop-eggs-directory']
         options['_d'] = options['develop-eggs-directory'] # backward compat.
 
-    def _get_patch_dict(self, options, distribution_list):
+    def _get_patch_dict(self, options, egg=None):
         patch_dict = {}
         global_patch_binary = options.get('patch-binary', 'patch')
+        if egg:
+            egg = re.sub('[<>=].*', '', egg)
+            egg_list = [egg]
+        else:
+            egg_list = [x[:-8] for x in options.keys() if x.endswith('-patches')]
         def get_option(egg, key, default):
-            if len(distribution_list) == 1:
+            if len(egg_list) == 1:
                 return options.get('%s-%s' % (egg, key),
                                    options.get(key, default))
             else:
                 return options.get('%s-%s' % (egg, key), default)
-        for distribution in distribution_list:
-            egg = re.sub('[<>=].*', '', distribution)
+        for egg in egg_list:
             patches = filter(lambda x:x,
                              map(lambda x:x.strip(),
                                  get_option(egg, 'patches', '').splitlines()))
@@ -103,7 +107,7 @@ class Eggs(object):
                 [options['develop-eggs-directory'], options['eggs-directory']]
                 )
         else:
-            patch_dict = self._get_patch_dict(options, distributions)
+            patch_dict = self._get_patch_dict(options)
             ws = zc.buildout.easy_install.install(
                 distributions, options['eggs-directory'],
                 links=self.links,