This pair of files are a crude attempt at providing a backup method of compiling static projects' source files (HAML and Sass) using the ease of rake tasking from the commandline.

compile_haml_sass_rake_tasks_Rakefile

#!/usr/bin/env ruby

require 'yaml'

# Load _config.yaml file
Conf = YAML.load_file File.join(Dir.pwd, 'rake_config.yaml')

# Paths
ROOT = Conf['root'] == '/' ? File.expand_path(File.dirname(__FILE__)) : Conf['root']
SRC_DIR = File.join ROOT, (Conf['source'] || 'src')
SITE_DIR = File.join ROOT, (Conf['output'] || 'site')

CSS_DIR, JS_DIR, IMAGES_DIR = %w{css js images}.map do |i|
  File.join SITE_DIR, (Conf["#{i}_dir'"] || i)
end

# Manually create output dir, as later file writing/creation will not do so
[SITE_DIR, CSS_DIR, JS_DIR, IMAGES_DIR].each do |dir_path|
  Dir::mkdir dir_path unless File.directory? dir_path
end

namespace :compile do
  desc 'Compile both haml and sass from source directory to output directory'
  task 'all' do
    compile_haml
    compile_sass
  end

  desc 'Compile sitemap'
  task 'sitemap' do
    compile_haml 'sitemap.html.haml'
  end

  desc 'Compile sass source directory to output directory'
  task 'sass' do
    compile_sass
  end

  desc 'Compile haml source directory to output directory'
  task 'haml' do
    compile_haml
  end

  def compile_sass(globs=nil)
    require 'sass'

    if Conf['sass'].nil?
      raise Exception.new('Conf file not loaded')
    else
    # Glean options from Conf
      sass_ext = Conf['sass']['extension'] || '.scss'
      sass_exc = Conf['sass']['exclude'] || /^[^\_]/

      sass_options = Conf['sass_options'] ? Conf['sass_options'].dup : {}
      sass_options[:syntax] ||= sass_ext.to_sym
      sass_options[:load_paths] ||= %w{scss sass}.map {|i| File.join SRC_DIR,i }
      sass_options[:style] ||= Conf['minified'] ? :compressed : Conf['sass']['style'] || :expanded

      globs ||= ["scss/*#{sass_ext}"].map! {|i| File.join SRC_DIR, i}

      Sass::Script::Number.precision = Conf['sass']['precision'] || 7

      FileList.new(globs).each do |filename|
        if !sass_exc.match(File.basename(filename)).nil? &&
          filename =~ /([^\/]+)(#{sass_ext})$/
          begin
            outfile = File.join(CSS_DIR, "#{$1}.css")
            unless File.exists?(outfile) && File.ctime(outfile) == File.ctime(filename)
              STDOUT.puts "Compiling #{filename} --> #{outfile}"
              File.open(outfile, 'w') do |f|
                f.write Sass::Engine.new(File.read(filename), sass_options).render
              end
            end
          rescue => e
            STDOUT.puts e.message
            next
          end
        else
          STDOUT.puts "Sass file in glob failed test: #{filename}"
        end
      end
    end
  rescue => e
    STDOUT.puts e.message
  end

  def compile_haml(globs=nil)
    require 'haml'
     %w{haml_helpers file_helpers}.each do |i|
      require File.join SRC_DIR, 'helpers',"#{i}.rb"
    end

    if Conf['haml'].nil?
      raise Exception.new('Conf file not loaded')
    else
      # Glean options from Conf
      haml_ext = Conf['haml']['extension'] || '.haml'
      haml_exc = Conf['haml']['exclude'] || /^[^\_]/

      haml_options = Conf['haml_options'] ?  Conf['haml_options'].dup : {}
      haml_options[:ugly] ||= Conf['minified'] || false

      globs ||= ["haml/*#{haml_ext}"].map! {|i| File.join SRC_DIR, i}

      FileList.new(globs).each do |filename|
        if !haml_exc.match(File.basename(filename)).nil? &&
          filename =~ /([^\/]+)#{haml_ext}$/
          begin
            outfile = File.join(SITE_DIR,"#{$1}.html")
            unless File.exists?(outfile) && File.ctime(outfile) == File.ctime(filename)
              STDOUT.puts "Compiling #{filename} --> #{outfile}"
              File.open(outfile, 'w') do |f|
                f.write Haml::Engine.new(File.read(filename), haml_options).render
              end
            end
          rescue => e
            STDOUT.puts e.message
            next
          end
        else
          STDOUT.puts "Haml file in glob failed test: #{filename}"
        end
      end
    end
  rescue => e
    STDOUT.puts e.message
  end

end

rake_config.yaml

--- # Rake compiler tasks for haml and sass
root: /                 # defaults to Dir.pwd
source: src             # defaults to src
output: site            # defaults to site
css_dir: css            # defaults to css
minified: false         # defaults to false
haml:
  extension: .haml # defaults to .haml
sass:
  extension: .scss  # defaults to .scss
  style: expanded
  precision: 7          # defaults to 7