This guardfile configuration combined with haml_helpers to enhance haml are a basic means to generate a static website using preprocessor languages CoffeeScript, Haml, and Sass; and the Compass framework; and the uglifier compression tool.

haml_sass_compass_coffee.rb

# Config
root = File.expand_path(File.dirname(__FILE__))
input, output = %w{src site}
haml_ext = "\.haml"
all_on_start = true

# Validate
unless File.directory?(File.join(root, input))
  abort('No source directory found, cannot continue')
end

# Helpers
%w{haml_helpers}.each do |i|
  require File.join(root, input, 'helpers', "#{i}.rb")
end

guard 'sass',
  :input => "#{input}/scss",
  :output => "#{output}/css",
  :all_on_start => true,
  :style => :compressed

# guard 'compass' do
#   watch %r{^#{input}/scss/[^/]+\.s[ac]ss$}
# end

guard 'haml',
  :input => "#{input}/haml",
  :output => output,
  :run_on_start => all_on_start,
  :options => { :escape_attrs => false } do
  watch %r{haml/[^/]+(#{haml_ext})$}
  watch %r{haml/partials/[^/]+#{haml_ext}$} do
    Dir.glob("#{input}/haml/*.haml")
  end
end

guard 'livereload' do
  watch %r{#{output}/.+\.(css|html|js)$}
end

# guard 'coffeescript',
#   :input => "#{input}/coffee",
#   :output => "#{output}/js",
#   :all_on_start => all_on_start

# guard :shell, :all_on_start => all_on_start do
#   watch %r{#{output}/js/([^\/]+)(?<!\.min)\.js$} do |m|
#     src_file = File.join(root, m[0])
#     dest_file = File.join(root, output, 'js', "#{m[1]}.min.js")
#     n "Uglifying #{m[1]}.js", 'SHELL'
#     system( "uglifyjs -o '#{dest_file}' '#{src_file}'" )
#     # require 'uglifier' unless defined?(Uglifier)
#     # File.open(dest_file, 'w') do |f|
#     #   f.puts Uglifier.compile(File.read(src_file))
#     # end
#   end
# end