[feat] zc.recipe.egg: Support setup-eggs in :develop.

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

@@ -31,6 +31,8 @@ class Base:
         self.name, self.options = name, options
 
         options['_d'] = buildout['buildout']['develop-eggs-directory']
+        options['_e'] = buildout['buildout']['eggs-directory']
+
 
         environment_section = options.get('environment')
         if environment_section:
@@ -43,9 +45,28 @@ class Base:
 
         self.build_ext = build_ext(buildout, options)
 
+        links = options.get('find-links',
+                            buildout['buildout'].get('find-links'))
+        if links:
+            links = links.split()
+            options['find-links'] = '\n'.join(links)
+        else:
+            links = ()
+        self.links = links
+
+        index = options.get('index', buildout['buildout'].get('index'))
+        if index is not None:
+            options['index'] = index
+        self.index = index
+
+        self.newest = buildout['buildout'].get('newest') == 'true'
+
+
+
     def install(self):
         self._set_environment()
         try:
+            self._install_setup_eggs()
             return self._install()
         finally:
             self._restore_environment()
@@ -73,6 +94,24 @@ class Base:
                 except KeyError:
                     pass
 
+    def _install_setup_eggs(self):
+        options = self.options
+        setup_eggs = [
+            r.strip()
+            for r in options.get('setup-eggs', '').split('\n')
+            if r.strip()]
+        if setup_eggs:
+            ws = zc.buildout.easy_install.install(
+                setup_eggs, options['_e'],
+                links=self.links,
+                index=self.index,
+                executable=sys.executable,
+                path=[options['_d'], options['_e']],
+                newest=self.newest,
+                )
+            extra_path = os.pathsep.join(ws.entries)
+            self.environment['PYTHONEXTRAPATH'] = os.environ['PYTHONEXTRAPATH'] = extra_path
+
     def _get_patch_dict(self, options, distribution):
         req, = pkg_resources.parse_requirements(distribution)
         return _get_patch_dict(options, [req.project_name])
@@ -83,27 +122,9 @@ class Custom(Base):
     def __init__(self, buildout, name, options):
         Base.__init__(self, buildout, name, options)
 
-        links = options.get('find-links',
-                            buildout['buildout'].get('find-links'))
-        if links:
-            links = links.split()
-            options['find-links'] = '\n'.join(links)
-        else:
-            links = ()
-        self.links = links
-
-        index = options.get('index', buildout['buildout'].get('index'))
-        if index is not None:
-            options['index'] = index
-        self.index = index
-
-        options['_e'] = buildout['buildout']['eggs-directory']
-
         if buildout['buildout'].get('offline') == 'true':
             self._install = lambda: ()
 
-        self.newest = buildout['buildout'].get('newest') == 'true'
-
     def _install(self):
         options = self.options
         distribution = options.get('egg')
@@ -118,22 +139,6 @@ class Custom(Base):
         distribution = options.get('egg', options.get('eggs', self.name)
                                    ).strip()
 
-        setup_eggs = [
-            r.strip()
-            for r in options.get('setup-eggs', '').split('\n')
-            if r.strip()]
-        if setup_eggs:
-            ws = zc.buildout.easy_install.install(
-                setup_eggs, options['_e'],
-                links=self.links,
-                index=self.index,
-                executable=sys.executable,
-                path=[options['_d'], options['_e']],
-                newest=self.newest,
-                )
-            extra_path = os.pathsep.join(ws.entries)
-            self.environment['PYTHONEXTRAPATH'] = os.environ['PYTHONEXTRAPATH'] = extra_path
-
         patch_dict = self._get_patch_dict(options, distribution)
         return zc.buildout.easy_install.build(
             distribution, options['_d'], self.build_ext,

zc.recipe.egg_/src/zc/recipe/egg/custom.rst

@@ -480,6 +480,10 @@ rpath
    A new-line separated list of directories to search for dynamic libraries
    at run time.
 
+setup-eggs
+   A new-line separated list of eggs that need to be installed
+   beforehand. It is useful to meet the `setup_requires` requirement.
+
 define
    A comma-separated list of names of C preprocessor variables to
    define.