convert haml templates into erb using the w2tags gem

haml2erb.rb

require 'rubygems'
require 'w2tags'
require File.join(File.dirname(__FILE__), '..', 'config', 'environment')

W2 = W2Tags::Parser.new('rails')
templates = Dir.glob("#{RAILS_ROOT}/app/views/**/*.haml")
puts "converting #{templates.size} to erb :("
templates.each do |template|
  haml_data = File.read(template)
  erb = W2.parse_line("%initialize\n"<<haml_data).join
  erb_template = File.new(template.gsub('haml', 'erb'), "w+")
  erb_template.puts(erb)
  erb_template.close
end

Note that w2tags doesn't seem to add an "<% end %>" tag at the close of blocks, so you'll have to go through and find where those are missing.