added "preview" functionality when editing wiki page

git-svn-id: http://redmine.rubyforge.org/svn/branches/work@306 e93f8b46-1217-0410-a6f0-8f06a7374b81

wiki/app/controllers/wiki_controller.rb

@@ -17,7 +17,7 @@
 
 class WikiController < ApplicationController
   layout 'base'
-  before_filter :find_wiki, :check_project_privacy
+  before_filter :find_wiki, :check_project_privacy, :except => [:preview]
     
   # display a page (in editing mode if it doesn't exist)
   def index
@@ -88,6 +88,11 @@ class WikiController < ApplicationController
     end
     render :action => "special_#{page_title}"
   end
+  
+  def preview
+    @text = params[:content][:text]
+    render :partial => 'preview'
+  end
 
 private