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# Redmine - project management software
# Copyright (C) 2006-2008 Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
module Redmine
module Hook
@@listener_classes = []
@@listeners = nil
@@hook_listeners = {}
class << self
# Adds a listener class.
# Automatically called when a class inherits from Redmine::Hook::Listener.
def add_listener(klass)
raise "Hooks must include Singleton module." unless klass.included_modules.include?(Singleton)
@@listener_classes << klass
clear_listeners_instances
end
# Returns all the listerners instances.
def listeners
@@listeners ||= @@listener_classes.collect {|listener| listener.instance}
end
# Returns the listeners instances for the given hook.
def hook_listeners(hook)
@@hook_listeners[hook] ||= listeners.select {|listener| listener.respond_to?(hook)}
end
# Clears all the listeners.
def clear_listeners
@@listener_classes = []
clear_listeners_instances
end
# Clears all the listeners instances.
def clear_listeners_instances
@@listeners = nil
@@hook_listeners = {}
end
# Calls a hook.
# Returns the listeners response.
def call_hook(hook, context={})
response = ''
hook_listeners(hook).each do |listener|
response << listener.send(hook, context).to_s
end
response
end
end
# Base class for hook listeners.
class Listener
include Singleton
include GLoc
# Registers the listener
def self.inherited(child)
Redmine::Hook.add_listener(child)
super
end
end
# Listener class used for views hooks.
# Listeners that inherit this class will include various helpers by default.
class ViewListener < Listener
include ERB::Util
include ActionView::Helpers::TagHelper
include ActionView::Helpers::FormHelper
include ActionView::Helpers::FormTagHelper
include ActionView::Helpers::FormOptionsHelper
include ActionView::Helpers::JavaScriptHelper
include ActionView::Helpers::PrototypeHelper
include ActionView::Helpers::NumberHelper
include ActionView::Helpers::UrlHelper
include ActionView::Helpers::AssetTagHelper
include ActionView::Helpers::TextHelper
include ActionController::UrlWriter
include ApplicationHelper
end
# Helper module included in ApplicationHelper so that hooks can be called
# in views like this:
# <%= call_hook(:some_hook) %>
# <%= call_hook(:another_hook, :foo => 'bar' %>
#
# Current project is automatically added to the call context.
module Helper
def call_hook(hook, context={})
Redmine::Hook.call_hook(hook, {:project => @project}.merge(context))
end
end
end
end
ApplicationHelper.send(:include, Redmine::Hook::Helper)
ActionController::Base.send(:include, Redmine::Hook::Helper)
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