gistfile1.rb

##
# Like ck_fu ( http://github.com/r38y/ck_fu ) but not
# I really like ck_fu. But I am not fond of adding tests, rake tasks, and a whole plugin folder for
# one method, two helper methods and some css. I also made it safe for Rails 1.2.6.
#
# in app/helpers/application_helper.rb
  def environment_div(options={})
    return '' if (options.has_key?(:if) ? !options[:if] : RAILS_ENV.to_s == 'production' )
    separator = options[:separator] || "|"
    text = [content_tag(:strong, RAILS_ENV.to_s.titlecase)]
    text << "Database: #{ActiveRecord::Base.connection.current_database}" if ActiveRecord::Base.connection.respond_to?(:current_database)
    text << "Database: #{ActiveRecord::Base::configurations[RAILS_ENV]['dbfile']}" if ActiveRecord::Base::configurations[RAILS_ENV]['adapter'] == 'sqlite3'
    text << "Revision: #{deployed_revision}" unless deployed_revision.blank? || options[:revision]
    text << "Deployed: #{deployed_date}" unless deployed_date.blank? || options[:date]
    (options[:links] || []).each do |link|
      text << "#{link_to link[0], link[1]}"
    end
    content_tag :div, text.join(" #{separator} "), :class => RAILS_ENV
  end

  def deployed_revision
    unless defined?(@deployed_revision)
      file = RAILS_ROOT + '/REVISION'
      @deployed_revision = File.exists?(file) ? File.open(file).read.strip : nil
    end
    @deployed_revision
  end

  def deployed_date
    unless defined?(@deployed_date)
      file = RAILS_ROOT + '/DATE'
      @deployed_date = File.exists?(file) ? File.open(file).read.strip : nil
    end
    @deployed_date
  end

# in app/views/layouts/*.haml
%body
  = environment_div
 
# in application.css
/* Styles for environment_div bar */
.environment {
  color: white;
  font-size: 1.2em;
  padding: 0.2em 0;
  margin: 0;
  text-align: center;
  font-family: Helvetica, sans-serif;
  width: 100%;
  line-height: 1.5em;
  background: red;
}
.production {
 display: none;
}
.environment a {
  color: white;
}
.development {
  background: green;
}
.demo {
  background: orange;
}
.test {
  background: darkCyan;
}
.staging {
  background: darkMagenta;
}