old_contents: # -*- coding: utf-8 -*-
  #
  # Copyright (c) 2014 Université Catholique de Louvain.
  #
  # This file is part of INGInious.
  #
  # INGInious is free software: you can redistribute it and/or modify
  # it under the terms of the GNU Affero General Public License as published
  # by the Free Software Foundation, either version 3 of the License, or
  # (at your option) any later version.
  #
  # INGInious is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU Affero General Public License for more details.
  #
  # You should have received a copy of the GNU Affero General Public
  # License along with INGInious.  If not, see <http://www.gnu.org/licenses/>.
  """ Hook Manager """
  
  
  class HookManager(object):
  
      """ Registers an manages hooks. Hooks are callback functions called when the backend does a specific action. """
  
      def __init__(self):
          self.hooks = {}
  
      def add_hook(self, name, callback):
          """ Add a new hook that can be called with the call_hook function """
          hook_list = self.hooks.get(name, [])
          hook_list.append(callback)
          self.hooks[name] = hook_list
  
      def call_hook(self, name, **kwargs):
          """ Call all hooks registered with this name """
          for func in self.hooks.get(name, []):
              func(**kwargs)
  
new_contents: # -*- coding: utf-8 -*-
  #
  # Copyright (c) 2014 Université Catholique de Louvain.
  #
  # This file is part of INGInious.
  #
  # INGInious is free software: you can redistribute it and/or modify
  # it under the terms of the GNU Affero General Public License as published
  # by the Free Software Foundation, either version 3 of the License, or
  # (at your option) any later version.
  #
  # INGInious is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU Affero General Public License for more details.
  #
  # You should have received a copy of the GNU Affero General Public
  # License along with INGInious.  If not, see <http://www.gnu.org/licenses/>.
  """ Hook Manager """
  
  
  class HookManager(object):
  
      """ Registers an manages hooks. Hooks are callback functions called when the backend does a specific action. """
  
      def __init__(self):
          self.hooks = {}
  
      def add_hook(self, name, callback):
          """ Add a new hook that can be called with the call_hook function """
          hook_list = self.hooks.get(name, [])
          hook_list.append(callback)
          self.hooks[name] = hook_list
  
      def call_hook(self, name, **kwargs):
          """ Call all hooks registered with this name. Returns a list of the returns values of the hooks (in the order the hooks were added)"""
          return map(lambda x: x(**kwargs), self.hooks.get(name, []))
  
subject: Allow hooks to return values (and simplify the code)