add caching hooks for Gollum::Markup

lib/gollum/markup.rb

@@ -348,8 +348,11 @@ module Gollum
     # Returns the placeholder'd String data.
     def extract_code(data)
       data.gsub(/^``` ?(.+?)\r?\n(.+?)\r?\n```\r?$/m) do
-        id = Digest::SHA1.hexdigest($2)
-        @codemap[id] = { :lang => $1, :code => $2 }
+        id     = Digest::SHA1.hexdigest($2)
+        cached = check_cache(id)
+        @codemap[id] = cached   ? 
+          { :output => cached } : 
+          { :lang => $1, :code => $2 }
         id
       end
     end
@@ -362,14 +365,36 @@ module Gollum
     # Returns the marked up String data.
     def process_code(data)
       @codemap.each do |id, spec|
-        lang = spec[:lang]
-        code = spec[:code]
-        if code.lines.all? { |line| line =~ /\A\r?\n\Z/ || line =~ /^(  |\t)/ }
-          code.gsub!(/^(  |\t)/m, '')
+        formatted = spec[:output] || begin
+          lang = spec[:lang]
+          code = spec[:code]
+          if code.lines.all? { |line| line =~ /\A\r?\n\Z/ || line =~ /^(  |\t)/ }
+            code.gsub!(/^(  |\t)/m, '')
+          end
+          formatted = Gollum::Albino.new(code, lang).colorize
+          update_cache(id, formatted)
+          formatted
         end
-        data.gsub!(id, Gollum::Albino.new(code, lang).colorize)
+        data.gsub!(id, formatted)
       end
       data
     end
+
+    # Hook for getting the formatted value of extracted tag data.  
+    #
+    # id - String SHA1 hash of original extracted tag data.
+    #
+    # Returns the String cached formatted data, or nil.
+    def check_cache(id)
+    end
+
+    # Hook for caching the formatted value of extracted tag data.
+    #
+    # id   - String SHA1 hash of original extracted tag data.
+    # data - The String formatted value to be cached.
+    #
+    # Returns nothing.
+    def update_cache(id, data)
+    end
   end
 end

lib/gollum/page.rb

@@ -120,7 +120,7 @@ module Gollum
     #
     # Returns the String data.
     def formatted_data
-      @blob && Gollum::Markup.new(self).render(historical?)
+      @blob && @wiki.markup_class.new(self).render(historical?)
     end
 
     # Public: The format of the page.

lib/gollum/wiki.rb

@@ -9,6 +9,9 @@ module Gollum
       # Sets the file class used by all instances of this Wiki.
       attr_writer :file_class
 
+      # Sets the markup class used by all instances of this Wiki.
+      attr_writer :markup_class
+
       # Sets the default name for commits.
       attr_accessor :default_committer_name
 
@@ -36,6 +39,17 @@ module Gollum
             ::Gollum::File
           end
       end
+
+      # Gets the markup class used by all instances of this Wiki.
+      # Default: Gollum::Markup
+      def markup_class
+        @markup_class ||
+          if superclass.respond_to?(:markup_class)
+            superclass.markup_class
+          else
+            ::Gollum::Markup
+          end
+      end
     end
 
     self.default_committer_name  = 'Anonymous'
@@ -51,10 +65,11 @@ module Gollum
     # repo    - The String path to the Git repository that holds the Gollum
     #           site.
     # options - Optional Hash:
-    #           :base_path  - String base path for all Wiki links.
-    #                         Default: "/"
-    #           :page_class - The page Class. Default: Gollum::Page
-    #           :file_class - The file Class. Default: Gollum::File
+    #           :base_path    - String base path for all Wiki links.
+    #                           Default: "/"
+    #           :page_class   - The page Class. Default: Gollum::Page
+    #           :file_class   - The file Class. Default: Gollum::File
+    #           :markup_class - The markup Class. Default: Gollum::Markup
     #
     # Returns a fresh Gollum::Repo.
     def initialize(path, options = {})
@@ -62,12 +77,13 @@ module Gollum
         options[:access] = path
         path             = path.path
       end
-      @path       = path
-      @access     = options[:access]     || GitAccess.new(path)
-      @base_path  = options[:base_path]  || "/"
-      @page_class = options[:page_class] || self.class.page_class
-      @file_class = options[:file_class] || self.class.file_class
-      @repo       = @access.repo
+      @path         = path
+      @access       = options[:access]       || GitAccess.new(path)
+      @base_path    = options[:base_path]    || "/"
+      @page_class   = options[:page_class]   || self.class.page_class
+      @file_class   = options[:file_class]   || self.class.file_class
+      @markup_class = options[:markup_class] || self.class.markup_class
+      @repo         = @access.repo
     end
 
     # Public: check whether the wiki's git repo exists on the filesystem.
@@ -298,6 +314,9 @@ module Gollum
     # Gets the file class used by all instances of this Wiki.
     attr_reader :file_class
 
+    # Gets the markup class used by all instances of this Wiki.
+    attr_reader :markup_class
+
     # Normalize the data.
     #
     # data - The String data to be normalized.