Added meta robots tag to the default layout; added error handling to published pages

app/controllers/application.rb

@@ -2,7 +2,7 @@
 # Likewise will all the methods added be available for all controllers.
 class ApplicationController < ActionController::Base
 
-  before_filter :connect_to_model, :setup_url_generator, :set_content_type_header
+  before_filter :connect_to_model, :setup_url_generator, :set_content_type_header, :set_robots_metatag
   after_filter :remember_location, :teardown_url_generator
 
   observer :page_observer
@@ -152,6 +152,14 @@ class ApplicationController < ActionController::Base
     end
   end
 
+  def set_robots_metatag
+    if controller_name == 'wiki' and %w(show published).include? action_name 
+      @robots_metatag_value = 'index,follow'
+    else
+      @robots_metatag_value = 'noindex,nofollow'
+    end
+  end
+
   def setup_url_generator
     PageRenderer.setup_url_generator(UrlGenerator.new(self))
   end

app/controllers/wiki_controller.rb

@@ -195,12 +195,13 @@ class WikiController < ApplicationController
   end
 
   def published
-    if @web.published?
-      page = wiki.read_page(@web_name, @page_name || 'HomePage') 
-      @renderer = PageRenderer.new(page.revisions.last)
-    else 
-      redirect_home
-    end
+    render_text("Published version of web '#{@web_name}' is not available", 404) and return if not @web.published?
+
+    page_name = @page_name || 'HomePage'
+    page = wiki.read_page(@web_name, page_name)
+    render_text("Page '#{page_name}' not found", 404) and return unless page
+    
+    @renderer = PageRenderer.new(page.revisions.last)
   end
   
   def revision

app/views/layouts/default.rhtml

@@ -14,6 +14,7 @@ PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   </title>
 
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+  <meta name="robots" content="<%= @robots_metatag_value %>" />
   
   <style type="text/css">
     h1#pageName, .newWikiWord a, a.existingWikiWord, .newWikiWord a:hover, #TextileHelp h3 {