allow mandatory value (see 9ddf100118 for more details)

tiramisu/setting.py

@@ -385,13 +385,17 @@ class Settings(object):
     #____________________________________________________________
     def validate_properties(self, opt_or_descr, is_descr, is_write, path,
                             value=None, force_permissive=False,
-                            force_properties=None):
+                            force_properties=None, force_permissives=None):
         """
         validation upon the properties related to `opt_or_descr`
 
         :param opt_or_descr: an option or an option description object
         :param force_permissive: behaves as if the permissive property
                                  was present
+        :param force_properties: set() with properties that is force to add
+                                 in global properties
+        :param force_permissives: set() with permissives that is force to add
+                                 in global permissives
         :param is_descr: we have to know if we are in an option description,
                          just because the mandatory property
                          doesn't exist here
@@ -408,6 +412,8 @@ class Settings(object):
         self_properties = copy(self._getproperties())
         if force_permissive is True or 'permissive' in self_properties:
             properties -= self._p_.getpermissive()
+        if force_permissives is not None:
+            properties -= force_permissives
 
         # global properties
         if force_properties is not None:

tiramisu/value.py

@@ -177,9 +177,16 @@ class Values(object):
         # options with callbacks
         setting = self.context().cfgimpl_get_settings()
         is_frozen = 'frozen' in setting[opt]
+        # For calculating properties, we need value (ie for mandatory value).
+        # If value is calculating with a PropertiesOptionError's option
+        # _getcallback_value raise a ConfigError.
+        # We can not raise ConfigError if this option should raise
+        # PropertiesOptionError too. So we get config_error and raise
+        # ConfigError if properties did not raise.
+        config_error = None
+        force_permissives = None
         # if value is callback and is not set
         # or frozen with force_default_on_freeze
-        config_error = None
         if opt.impl_has_callback() and (
                 self._is_default_owner(path) or
                 (is_frozen and 'force_default_on_freeze' in setting[opt])):
@@ -198,6 +205,9 @@ class Values(object):
                     value = self._getcallback_value(opt)
                 except ConfigError as config_error:
                     value = None
+                    # should not raise PropertiesOptionError if option is
+                    # mandatory
+                    force_permissives = set(['mandatory'])
                 else:
                     if (opt.impl_is_multi() and
                             opt.impl_get_multitype() == multitypes.slave):
@@ -222,7 +232,8 @@ class Values(object):
         if validate_properties:
             setting.validate_properties(opt, False, False, value=value, path=path,
                                         force_permissive=force_permissive,
-                                        force_properties=force_properties)
+                                        force_properties=force_properties,
+                                        force_permissives=force_permissives)
         if config_error is not None:
             raise ConfigError(config_error)
         return value