Remove first&last and only use "position" in plugins events

src/events.py

@@ -30,23 +30,20 @@ class EventHandler(object):
             'muc_msg': [],
             }
 
-    def add_event_handler(self, name, callback, first=True, last=False, position=None):
+    def add_event_handler(self, name, callback, position=0):
         """
         Add a callback to a given event.
         Note that if that event name doesn’t exist, it just returns False.
         If it was successfully added, it returns True
+        position: 0 means insert a the beginning, -1 means end
         """
         if name not in self.events:
             return False
 
-        if first:
-            self.events[name].insert(0, callback)
-        elif last:
-            self.events[name].append(callback)
-        elif position != None and isinstance(position, int):
+        if position >= 0:
             self.events[name].insert(position, callback)
         else:
-            self.events[name].insert(0, callback)
+            self.events[name].append(callback)
 
         return True
 

src/plugin.py

@@ -85,8 +85,8 @@ class BasePlugin(object, metaclass=SafetyMetaclass):
     def del_event_handler(self, event_name, handler):
         return self.plugin_manager.del_event_handler(self.__module__, event_name, handler)
 
-    def add_poezio_event_handler(self, event_name, handler, first=True, last=False, position=None):
-        return self.plugin_manager.add_poezio_event_handler(self.__module__, event_name, handler, first, last, position)
+    def add_poezio_event_handler(self, event_name, handler, position=0):
+        return self.plugin_manager.add_poezio_event_handler(self.__module__, event_name, handler, position)
 
     def del_poezio_event_handler(self, event_name, handler):
         return self.plugin_manager.del_poezio_event_handler(self.__module__, event_name, handler)

src/plugin_manager.py

@@ -107,10 +107,10 @@ class PluginManager(object):
         eh = self.event_handlers[module_name]
         eh = list(filter(lambda e : e != (event_name, handler), eh))
 
-    def add_poezio_event_handler(self, module_name, event_name, handler, first, last, position):
+    def add_poezio_event_handler(self, module_name, event_name, handler, position):
         eh = self.poezio_event_handlers[module_name]
         eh.append(handler)
-        self.core.events.add_event_handler(event_name, handler, first, last, position)
+        self.core.events.add_event_handler(event_name, handler, position)
 
     def del_poezio_event_handler(self, module_name, event_name, handler):
         self.core.events.del_event_handler(None, handler)