- Now create a minimal setup.py if it doesn't exist and issue a

  warning that it is being created.

- Fixed bug in saving installed configuration data.  %'s and extra
  spaces weren't quoted.

src/zc/buildout/buildout.py

@@ -60,6 +60,9 @@ class Buildout(dict):
     def __init__(self, config_file, cloptions):
         config_file = os.path.abspath(config_file)
         self._config_file = config_file
+        if not os.path.exists(config_file):
+            print 'Warning: creating', config_file
+            open(config_file, 'w').write('[buildout]\nparts = \n')
 
         super(Buildout, self).__init__()
 
@@ -376,10 +379,15 @@ class Buildout(dict):
     def _read_installed_part_options(self):
         old = self._installed_path()
         if os.path.isfile(old):
-            parser = ConfigParser.SafeConfigParser()
+            parser = ConfigParser.SafeConfigParser(_spacey_defaults)
             parser.read(old)
             return dict([
-                (section, Options(self, section, parser.items(section)))
+                (section,
+                 Options(self, section,
+                         [item for item in parser.items(section)
+                          if item[0] not in _spacey_defaults]
+                         )
+                 )
                 for section in parser.sections()])
         else:
             return {'buildout': Options(self, 'buildout', {'parts': ''})}
@@ -453,13 +461,44 @@ class Buildout(dict):
             for section in sections:
                 _save_options(section, self[section], sys.stdout)
             print    
-        
+
+_spacey_nl = re.compile('^[ \t\r\f\v]+'
+                        '|''[ \t\r\f\v]*\n[ \t\r\f\v\n]*'
+                        '|'
+                        '[ \t\r\f\v]+$'
+                        )
+
+def _quote_spacey_nl(match):
+    match = match.group(0).split('\n', 1)
+    result = '\n\t'.join(
+        [(s
+          .replace(' ', '%(__buildout_space__)s')
+          .replace('\r', '%(__buildout_space_r__)s')
+          .replace('\f', '%(__buildout_space_f__)s')
+          .replace('\v', '%(__buildout_space_v__)s')
+          .replace('\n', '%(__buildout_space_n__)s')
+          )
+         for s in match]
+        )
+    return result
+
+_spacey_defaults = dict(
+    __buildout_space__   = ' ',
+    __buildout_space_r__ = '\r',
+    __buildout_space_f__ = '\f',
+    __buildout_space_v__ = '\v',
+    __buildout_space_n__ = '\n',
+    )
+
 def _save_options(section, options, f):
     print >>f, '[%s]' % section
     items = options.items()
     items.sort()
     for option, value in items:
-        print >>f, option, '=', str(value).replace('\n', '\n\t')
+        value = value.replace('%', '%%')
+        value = _spacey_nl.sub(_quote_spacey_nl, value)
+        print >>f, option, '=', value
+            
     
 
 def _open(base, filename, seen):

src/zc/buildout/buildout.txt

@@ -1066,7 +1066,7 @@ database is shown.
     eggs-directory = /tmp/sample-buildout/eggs
     executable = /usr/local/bin/python2.3
     installed = /tmp/sample-buildout/.installed.cfg
-    log-format = %(name)s: %(message)s
+    log-format = %%(name)s: %%(message)s
     log-level = WARNING
     parts = 
     parts-directory = /tmp/sample-buildout/parts
@@ -1141,18 +1141,16 @@ Bootstrapping
 
 If zc.buildout is installed, you can use it to create a new buildout
 with it's own local copies of zc.buildout and setuptools and with
-local buildout scripts.  There must be an existing setup.cfg:
+local buildout scripts. 
 
     >>> sample_bootstrapped = mkdtemp('sample-bootstrapped')
-    >>> write(sample_bootstrapped, 'setup.cfg',
-    ... '''
-    ... [buildout]
-    ... parts = foo this will not be read :)
-    ... ''')
 
     >>> print system(buildout
     ...              +' -c'+os.path.join(sample_bootstrapped, 'setup.cfg')
     ...              +' bootstrap'),
+    Warning: creating /sample-bootstrapped/setup.cfg
+
+Note that a basic setup.cfg was created for us.
 
     >>> ls(sample_bootstrapped)
     d  bin
@@ -1173,7 +1171,7 @@ local buildout scripts.  There must be an existing setup.cfg:
 
 
 Note that, in this example, we were using a development egg for the
-buildout, and the ac.buildout egg ended up as an egg link.
+buildout, and the zc.buildout egg ended up as an egg link.
 
 Also not that the buildout script was installed but not run.  To run
 the buildout, we'd have to run the installed buildout script.

src/zc/buildout/tests.py

@@ -61,6 +61,71 @@ It is an error to create a variable-reference cycle:
            [('buildout', 'y'), ('buildout', 'z'), ('buildout', 'x')],
            ('buildout', 'y'))
 """
+ 
+def test_comparing_saved_options_with_funny_characters():
+    """
+    If an option has newlines, extra/odd spaces or a %, we need to make
+    sure the comparison with the saved value works correctly.
+
+    >>> mkdir(sample_buildout, 'recipes')
+    >>> write(sample_buildout, 'recipes', 'debug.py', 
+    ... '''
+    ... class Debug:
+    ...     def __init__(self, buildout, name, options):
+    ...         options['debug'] = \"\"\"  <zodb>
+    ...
+    ...   <filestorage>
+    ...     path foo
+    ...   </filestorage>
+    ...
+    ... </zodb>  
+    ...      \"\"\"
+    ...         options['debug2'] = '  x  '
+    ...         options['debug3'] = '42'
+    ...         options['format'] = '%3d'
+    ...
+    ...     def install(self):
+    ...         open('t', 'w').write('t')
+    ...         return 't'
+    ... ''')
+
+
+    >>> write(sample_buildout, 'recipes', 'setup.py',
+    ... '''
+    ... from setuptools import setup
+    ... setup(
+    ...     name = "recipes",
+    ...     entry_points = {'zc.buildout': ['default = debug:Debug']},
+    ...     )
+    ... ''')
+
+    >>> write(sample_buildout, 'recipes', 'README.txt', " ")
+
+    >>> write(sample_buildout, 'buildout.cfg',
+    ... '''
+    ... [buildout]
+    ... develop = recipes
+    ... parts = debug
+    ...
+    ... [debug]
+    ... recipe = recipes
+    ... ''')
+
+    >>> os.chdir(sample_buildout)
+    >>> buildout = os.path.join(sample_buildout, 'bin', 'buildout')
+
+    >>> print system(buildout+' -v'), # doctest: +ELLIPSIS
+    buildout: Running ...setup.py -q develop ...
+    buildout: Installing debug
+
+If we run the buildout again, we shoudn't get a message about
+uninstalling anything because the configuration hasn't changed.
+
+    >>> print system(buildout+' -v'),
+    buildout: Running setup.py -q develop ...
+    buildout: Installing debug
+"""
+
 
 def linkerSetUp(test):
     zc.buildout.testing.buildoutSetUp(test, clear_home=False)
@@ -136,6 +201,7 @@ def test_suite():
                (re.compile('executable = \S+python\S*'),
                 'executable = python'),
                (re.compile('setuptools-\S+[.]egg'), 'setuptools.egg'),
+               (re.compile('creating \S*setup.cfg'), 'creating setup.cfg'),
                ])
             ),
         
@@ -154,7 +220,13 @@ def test_suite():
             ),
         doctest.DocTestSuite(
             setUp=zc.buildout.testing.buildoutSetUp,
-            tearDown=zc.buildout.testing.buildoutTearDown),
+            tearDown=zc.buildout.testing.buildoutTearDown,
+
+            checker=PythonNormalizing([
+               (re.compile("buildout: Running \S*setup.py"),
+                'buildout: Running setup.py'),
+               ]),
+            )
         ))
 
 if __name__ == '__main__':