Added mail notification when a new message is posted in the forums.

Only users who "watch" the board receive notifications. To watch a board, go to the board and click on the "Watch" link.

Notifications are sent by MessageObserver observer.
GLoc was modified to use the mail template without language suffix when translated template (with language suffix) doesn't exist.
Usefull when there's no hard coded text in the mail tempate.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@531 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/mailer.rb

@@ -87,4 +87,12 @@ class Mailer < ActionMailer::Base
     @subject        = l(:mail_subject_register)
     @body['token']  = token
   end
+  
+  def message_posted(message, recipients)
+    set_language_if_valid(Setting.default_language)
+    @recipients     = recipients
+    @from           = Setting.mail_from
+    @subject        = "[#{message.board.project.name} - #{message.board.name}] #{message.subject}"
+    @body['message'] = message
+  end
 end

app/models/message_observer.rb

@@ -0,0 +1,24 @@
+# redMine - project management software
+# Copyright (C) 2006-2007  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.
+
+class MessageObserver < ActiveRecord::Observer
+  def after_create(message)
+    # send notification to board watchers
+    recipients = message.board.watcher_recipients
+    Mailer.deliver_message_posted(message, recipients) unless recipients.empty?
+  end
+end

app/views/mailer/message_posted.rhtml

@@ -0,0 +1,4 @@
+<%= l(:field_author) %>: <%= @message.author.name %>
+<%= url_for :only_path => false, :host => Setting.host_name, :controller => 'messages', :action => 'show', :board_id => @message.board_id, :id => @message.root %>
+
+<%= @message.content %>

config/environment.rb

@@ -30,6 +30,7 @@ Rails::Initializer.run do |config|
   
   # Activate observers that should always be running
   # config.active_record.observers = :cacher, :garbage_collector
+  config.active_record.observers = :message_observer
 
   # Make Active Record use UTC-base instead of local time
   # config.active_record.default_timezone = :utc

vendor/plugins/gloc-1.1.0/lib/gloc-rails.rb

@@ -92,7 +92,8 @@ module ActionMailer #:nodoc:
     private
     alias :render_message_without_gloc :render_message
     def render_message(method_name, body)
-      render_message_without_gloc("#{method_name}_#{current_language}", body)
+      template = File.exist?("#{template_path}/#{method_name}_#{current_language}.rhtml") ? "#{method_name}_#{current_language}" : "#{method_name}"
+      render_message_without_gloc(template, body)
     end
   end
 end