Render for Sinatra using markaby and with cache.

example.rb

require "rubygems"
require "sinatra"
require "render"

Sinatra::EventContext.send :include, Render 

SVN_REPO_PATH = "/home/tiago/projects/repo/trunk"

get "/" do
  render :cache => true, :expire => 60 do
    head { 
      title "SVN WATCH" 
      style "body {
		background-color:#f7fcff;
		font-family:arial;
		padding:30px;
	}
	
	pre {
	  background-color:#fff;
	  padding:10px;
	  border-top:1px solid #333;
	  border-bottom:1px solid #333;	  
	}

", :type => "text/css"
    }
    body do
      h1 "Watch #{SVN_REPO_PATH} - Last update #{Time.now}"
      h2 "HEAD LOG"
      pre `svn log --revision HEAD #{SVN_REPO_PATH}`
      h2 "DIFF PREV:HEAD"
      pre `svn diff --revision HEAD #{SVN_REPO_PATH}` 
    end
  end
end

get "/test" do
  render :cache => true, :expire => 10 do
          h1 "Last update at: #{Time.now}"
        end
end

render.rb

require "markaby"
require "fileutils"
# Render/Cache system for Sinatra with  Markaby.
module Render
  # Will receive a block and render with Markaby.
  # Cache options: 
  # * cache - Boolean.
  # * Expire - Number (seconds).
  # Example:
  #    require "rubygems"
  #    require "sinatra"
  #    require "markaby"
  #    require "fileutils"
  #    require "markaby"
  #    Sinatra::EventContext.send :include, Render 
  #    get "/"
  #      render :cache => true, :expire => 10 do
  #        h1 "Last update at: #{Time.now}"
  #      end
  #    end
  def render(options={:cache => false, :expire => 60 }, &block)
    mab = Markaby::Builder.new
    uri = request.env["REQUEST_URI"] == "/" ? 'index' : request.env["REQUEST_URI"] 
    uri << '.html'
    path = File.join(File.dirname(__FILE__), 'cache', uri)
    if File.exists?(path) and options[:cache]
       File.unlink(path) if Time.now > (File.ctime(path) + options[:expire])
    end
    if File.exists?(path) and options[:cache]
      File.open(path, 'r').readlines
    else
      content = mab.html(&block)
      if options[:cache]
        FileUtils.mkdir_p(File.dirname(path)) unless File.exists?(File.dirname(path))
        File.open(path, 'w') { |f| f.write( content ) } 
      end
      content     
    end
  end
end