adding detachment functionality

bin/jekyll

@@ -82,6 +82,7 @@ command :serve do |c|
   c.option '--limit_posts MAX_POSTS', Integer, 'Limits the number of posts to parse and publish'
   c.option '-w', '--watch', 'Watch for changes and rebuild'
   c.option '--lsi', 'Use LSI for improved related posts'
+  c.option '--detach', 'Run this server in the background'
   c.option '-D', '--drafts', 'Render posts in the _drafts folder'
 
   c.option '-P', '--port [PORT]', 'Port to listen on'

lib/jekyll/commands/serve.rb

@@ -24,9 +24,17 @@ module Jekyll
         )
 
         s.mount(options['baseurl'], HTTPServlet::FileHandler, destination, fh_option)
-        t = Thread.new { s.start }
-        trap("INT") { s.shutdown }
-        t.join()
+
+        unless options['detach']
+          t = Thread.new { s.start }
+          trap("INT") { s.shutdown }
+          t.join()
+        else
+          # they are detaching the server.
+          pid = Process.fork {s.start}
+          Process.detach(pid)
+          pid
+        end
       end
     end
   end