A sample of generating HTML with haml.

Rakefile

require 'haml'
require 'rake/clean'

SRC = FileList["haml/*.haml"].exclude("haml/layout.haml")
TARGET = SRC.ext(".html")
CLEAN.push(TARGET.sub("haml/", "html/"))

rule ".html" => ".haml" do |t|
  engine = Haml::Engine.new(File.read('haml/layout.haml'))
  scope = Object.new
  output = engine.render(scope, :title => t.source.ext("")){
    e = Haml::Engine.new(File.read(t.source))
    e.render(scope)
  }
  File.open(t.name, "w+") do |file|
    file.puts output
  end
end

desc "generate html files"
task :html => TARGET do |t|
  mkdir_p "html"
  mv t.prerequisites, "html/"
end