Extract message system to plugin.

lib/foodsoft_messages/lib/foodsoft_messages.rb

@@ -0,0 +1,6 @@
+require "foodsoft_messages/engine"
+require "foodsoft_messages/user_link"
+require "deface"
+
+module FoodsoftMessages
+end

lib/foodsoft_messages/lib/foodsoft_messages/engine.rb

@@ -0,0 +1,11 @@
+module FoodsoftMessages
+  class Engine < ::Rails::Engine
+    def navigation(primary, context)
+      item = SimpleNavigation::Item.new(primary, :messages, I18n.t('navigation.messages'), context.messages_path)
+      sub_nav = primary[:foodcoop].sub_navigation
+      # display right before tasks item
+      tasks_index = sub_nav.items.index(sub_nav[:tasks])
+      sub_nav.items.insert(tasks_index, item)
+    end
+  end
+end

lib/foodsoft_messages/lib/foodsoft_messages/user_link.rb

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+module FoodsoftMessages
+
+  module UserLink
+    def self.included(base) # :nodoc:
+      base.class_eval do
+
+        # modify user presentation link to writing a message for the user
+        def show_user_link(user=@current_user)
+          if user.nil?
+            show_user user
+          else
+            link_to show_user(user), new_message_path('message[mail_to]' => user.id),
+                                    :title => I18n.t('helpers.messages.write_message')
+          end
+        end
+
+      end
+    end
+  end
+
+end
+
+# modify existing helper
+ActiveSupport.on_load(:after_initialize) do
+  ApplicationHelper.send :include, FoodsoftMessages::UserLink
+end

lib/foodsoft_messages/lib/foodsoft_messages/version.rb

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+module FoodsoftMessages
+  VERSION = "0.0.1"
+end