can remove config from a metaconfig

ChangeLog

@@ -1,3 +1,7 @@
+Sat Sep  8 22:54:12 2018 +0200 Emmanuel Garette <egarette@cadoles.com>
+	* propose a new API to access to Tiramisu Option
+	This new API is totally incompatible with older's one
+
 Sat Jul  8 15:57:13 2017 +0200 Emmanuel Garette <egarette@cadoles.com>
 	* better cache, only remove value/property from cache for value
 	modified and for all value affected by this modification

test/test_metaconfig.py

@@ -185,6 +185,17 @@ def test_meta_new_config():
     assert len(list(meta.config.list())) == 3
 
 
+def test_meta_pop_config():
+    od = make_description()
+    meta = MetaConfig(['name1', 'name2'], optiondescription=od)
+    assert len(list(meta.config.list())) == 2
+    meta.config.new('newconf1')
+    assert len(list(meta.config.list())) == 3
+    meta.config.pop('newconf1')
+    assert len(list(meta.config.list())) == 2
+    raises(ConfigError, "meta.config.pop('newconf1')")
+
+
 def test_meta_new_config_wrong_name():
     od = make_description()
     meta = MetaConfig(['name1', 'name2'], optiondescription=od)

tiramisu/api.py

@@ -1002,6 +1002,10 @@ class TiramisuContextConfig(TiramisuContext):
                persistent=False):
         return Config(self.config_bag.context.new_config(session_id=session_id, persistent=persistent))
 
+    def _m_pop(self,
+               session_id):
+        return Config(self.config_bag.context.pop_config(session_id=session_id))
+
     def _m_list(self):
         return self._g_list()
 

tiramisu/config.py

@@ -1140,3 +1140,10 @@ class KernelMetaConfig(KernelGroupConfig):
         config._impl_meta = weakref.ref(self)
         self._impl_children.append(config)
         return config
+
+    def pop_config(self,
+                   session_id):
+        for idx, child in enumerate(self._impl_children):  # pragma: no cover
+            if session_id == child._impl_name:
+                return self._impl_children.pop(idx)
+        raise ConfigError(_('cannot find the config {}').format(session_id))