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+module Jekyll

+

+  # Extended plugin type that allows the plugin

+  # to be called on varous callback methods.

+  #

+  # Examples:

+  # https://github.com/tedkulp/octopress/blob/master/plugins/post_metaweblog.rb

+  # https://github.com/tedkulp/octopress/blob/master/plugins/post_twitter.rb

+  class PostFilter < Plugin

+

+    #Called before post is sent to the converter. Allows

+    #you to modify the post object before the converter

+    #does it's thing

+    def pre_render(post)

+    end

+

+    #Called after the post is rendered with the converter.

+    #Use the post object to modify it's contents before the

+    #post is inserted into the template.

+    def post_render(post)

+    end

+

+    #Called after the post is written to the disk.

+    #Use the post object to read it's contents to do something

+    #after the post is safely written.

+    def post_write(post)

+    end

+  end

+

+  # Monkey patch for the Jekyll Site class. For the original class,

+  # see: https://github.com/mojombo/jekyll/blob/master/lib/jekyll/site.rb

+  class Site

+

+    # Instance variable to store the various post_filter

+    # plugins that are loaded.

+    attr_accessor :post_filters

+

+    # Instantiates all of the post_filter plugins. This is basically

+    # a duplication of the other loaders in Site#setup.

+    def load_post_filters

+      self.post_filters = Jekyll::PostFilter.subclasses.select do |c|

+        !self.safe || c.safe

+      end.map do |c|

+        c.new(self.config)

+      end

+    end

+  end

+

+  # Monkey patch for the Jekyll Post class. For the original class,

+  # see: https://github.com/mojombo/jekyll/blob/master/lib/jekyll/post.rb

+  class Post

+

+    # Copy the #write method to #old_write, so we can redefine #write

+    # method.

+    alias_method :old_write, :write

+

+    # Write the generated post file to the destination directory. It

+    # then calls any post_write methods that may exist.

+    #   +dest+ is the String path to the destination dir

+    #

+    # Returns nothing

+    def write(dest)

+      old_write(dest)

+      post_write if respond_to?(:post_write)

+    end

+  end

+

+  # Monkey patch for the Jekyll Page class. For the original class,

+  # see: https://github.com/mojombo/jekyll/blob/master/lib/jekyll/page.rb

+  class Page

+

+    # Copy the #write method to #old_write, so we can redefine #write

+    # method.

+    alias_method :old_write, :write

+

+    # Write the generated post file to the destination directory. It

+    # then calls any post_write methods that may exist.

+    #   +dest+ is the String path to the destination dir

+    #

+    # Returns nothing

+    def write(dest)

+      old_write(dest)

+      post_write if respond_to?(:post_write)

+    end

+  end

+

+  # Monkey patch for the Jekyll Convertible module. For the original class,

+  # see: https://github.com/mojombo/jekyll/blob/master/lib/jekyll/convertible.rb

+  module Convertible

+

+    def is_post?

+      self.class.to_s == 'Jekyll::Post'

+    end

+

+    def is_page?

+      self.class.to_s == 'Jekyll::Page'

+    end

+

+    def is_filterable?

+      is_post? or is_page?

+    end

+

+    # Call the #pre_render methods on all of the loaded

+    # post_filter plugins.

+    #

+    # Returns nothing

+    def pre_render

+      self.site.load_post_filters unless self.site.post_filters

+

+      if self.site.post_filters and is_filterable?

+        self.site.post_filters.each do |filter|

+          filter.pre_render(self)

+        end

+      end

+    end

+

+    # Call the #post_render methods on all of the loaded

+    # post_filter plugins.

+    #

+    # Returns nothing

+    def post_render

+      if self.site.post_filters and is_filterable?

+        self.site.post_filters.each do |filter|

+          filter.post_render(self)

+        end

+      end

+    end

+

+    # Call the #post_write methods on all of the loaded

+    # post_filter plugins.

+    #

+    # Returns nothing

+    def post_write

+      if self.site.post_filters and is_filterable?

+        self.site.post_filters.each do |filter|

+          filter.post_write(self)

+        end

+      end

+    end

+

+    # Copy the #transform method to #old_transform, so we can

+    # redefine #transform method.

+    alias_method :old_transform, :transform

+

+    # Transform the contents based on the content type. Then calls the

+    # #post_render method if it exists

+    #

+    # Returns nothing.

+    def transform

+      old_transform

+      post_render if respond_to?(:post_render)

+    end

+

+    # Copy the #do_layout method to #old_do_layout, so we can

+    # redefine #do_layout method.

+    alias_method :old_do_layout, :do_layout

+

+    # Calls the pre_render method if it exists and then adds any necessary

+    # layouts to this convertible document.

+    #

+    # payload - The site payload Hash.

+    # layouts - A Hash of {"name" => "layout"}.

+    #

+    # Returns nothing.

+    def do_layout(payload, layouts)

+      pre_render if respond_to?(:pre_render)

+      old_do_layout(payload, layouts)

+    end

+

+    # Returns the full url of the post, including the

+    # configured url

+    def full_url

+      self.site.config['url'] + self.url

+    end

+  end

+end