Some small efficiencies in the Chunk-handler

Also, log Maruku's processing time, out of perverse
interest.

lib/chunks/chunk.rb

@@ -45,12 +45,11 @@ def initialize(match_data, content)
 
     # Find all the chunks of the given type in content
     # Each time the pattern is matched, create a new
-    # chunk for it, and replace the occurance of the chunk
+    # chunk for it, and replace the occurrence of the chunk
     # in this content with its mask.
 	def self.apply_to(content)
 	  text = content.to_str
 	  text.gsub!( self.pattern ) do |match|
-#	    content.replace text	
         new_chunk = self.new($~, content)
         content.add_chunk(new_chunk)
         new_chunk.mask

lib/chunks/engines.rb

@@ -71,9 +71,11 @@ def mask
         @content.options[:renderer].s5_theme = my_content.s5_theme
         my_content.to_s5
       else
+        (t = Time.now; nil)
         html = Maruku.new(@content.delete("\r").to_utf8,
              {:math_enabled => true,
               :math_numbered => ['\\[','\\begin{equation}']}).to_html
+        (ApplicationController.logger.info("Maruku took " + (Time.now-t).to_s + " seconds."); nil)
         html.gsub(/\A<div class="maruku_wrapper_div">\n?(.*?)\n?<\/div>\Z/m, '\1')
       end
     end

lib/wiki_content.rb

@@ -8,6 +8,7 @@
 require 'chunks/nowiki'
 require 'sanitizer'
 require 'instiki_stringsupport'
+require 'set'
 
 
 # Wiki content is just a string that can process itself with a chain of
@@ -53,10 +54,10 @@ module ChunkManager
   def init_chunk_manager
     @chunks_by_type = Hash.new
     Chunk::Abstract::derivatives.each{|chunk_type|
-      @chunks_by_type[chunk_type] = Array.new
+      @chunks_by_type[chunk_type] = Set.new
     }
     @chunks_by_id = Hash.new
-    @chunks = []
+    @chunks = Set.new
     @chunk_id = 0
   end