Add CleanLocalUrls filter for removing localhost URLs

Enabled by default in FileScraper

lib/docs/core/scrapers/file_scraper.rb

@@ -13,6 +13,8 @@ module Docs
 
     self.base_url = 'http://localhost/'
 
+    html_filters.push 'clean_local_urls'
+
     private
 
     def request_one(url)

lib/docs/filters/core/clean_local_urls.rb

@@ -0,0 +1,16 @@
+module Docs
+  class CleanLocalUrlsFilter < Filter
+    def call
+      if base_url.host == 'localhost'
+        css('img[src^="http://localhost"]', 'iframe[src^="http://localhost"]').remove
+
+        css('a[href^="http://localhost"]').each do |node|
+          node.name = 'span'
+          node.remove_attribute 'href'
+        end
+      end
+
+      doc
+    end
+  end
+end