Text editor extracted from Gollum Wiki for Rails 3.1+
Add this to your GEMFILE
gem 'gollum_editor'
rails g gollum_editor:install
Include the javascripts and stylesheets
<%= stylesheet_link_tag "gollum_editor/gollum" %>
<%= javascript_include_tag "gollum_editor/gollum" %>
Call it from your form builder
f.gollum_editor :body
or as a form helper
gollum_editor @object, :method