allow use of rdiscount if --rdiscount is set and gem is installed

History.txt

@@ -1,6 +1,7 @@
 == 
   * Major Changes
     * Use Maruku (pure Ruby) for Markdown by default [github.com/mreid]
+    * Allow use of RDiscount with --rdiscount flag
   * Minor Enhancements
     * Don't load directory_watcher unless it's needed [github.com/pjhyett]
 

README.textile

@@ -80,7 +80,7 @@ The best way to install Jekyll is via RubyGems:
   $ sudo gem install mojombo-jekyll -s http://gems.github.com/
 
 Jekyll requires the gems `directory_watcher`, `liquid`, `open4`, 
-and `maruku` for markdown support. These are automatically
+and `maruku` (for markdown support). These are automatically
 installed by the gem install command.
 
 Maruku comes with optional support for LaTeX to PNG rendering via
@@ -123,6 +123,13 @@ during the conversion:
 
   $ jekyll --pygments
 
+By default, Jekyll uses "Maruku":http://maruku.rubyforge.org (pure Ruby) for
+Markdown support. If you'd like to use RDiscount (faster, but requires
+compilation), you must install it (gem install rdiscount) and then you can
+have it used instead:
+
+  $ jekyll --rdiscount
+
 h2. Data
 
 Jekyll traverses your site looking for files to process. Any files with YAML

bin/jekyll

@@ -32,6 +32,16 @@ opts = OptionParser.new do |opts|
   opts.on("--pygments", "Use pygments to highlight code") do
     Jekyll.pygments = true
   end
+
+  opts.on("--rdiscount", "Use rdiscount gem for Markdown") do
+    begin
+      require 'rdiscount'
+      Jekyll.markdown_proc = Proc.new { |x| RDiscount.new(x).to_html }
+      puts 'Using rdiscount for Markdown'
+    rescue LoadError
+      puts 'You must have the rdiscount gem installed first'
+    end
+  end
 end
 
 opts.parse!

lib/jekyll.rb

@@ -44,11 +44,12 @@ module Jekyll
   VERSION = '0.2.0'
 
   class << self
-    attr_accessor :source, :dest, :lsi, :pygments
+    attr_accessor :source, :dest, :lsi, :pygments, :markdown_proc
   end
 
   Jekyll.lsi = false
   Jekyll.pygments = false
+  Jekyll.markdown_proc = Proc.new { |x| Maruku.new(x).to_html }
 
   def self.process(source, dest)
     require 'classifier' if Jekyll.lsi

lib/jekyll/convertible.rb

@@ -30,7 +30,7 @@ def transform
         self.content = RedCloth.new(self.content).to_html
       when ".markdown":
         self.ext = ".html"
-        self.content = Maruku.new(self.content).to_html
+        self.content = Jekyll.markdown_proc.call(self.content)
       end
     end