Simple & stupid HAML to ERB convertor...

haml2erb

#!/usr/bin/env ruby
#
# haml2erb

require 'rubygems'
require 'haml'

class ErbEngine < Haml::Engine
  def push_script(text, preserve_script, in_tag = false, preserve_tag = false,
                  escape_html = false, nuke_inner_whitespace = false)
    push_text "<%= #{text.strip} %>"
  end
  
  def push_silent(text, can_suppress = false)
    push_text "<% #{text.strip} %>"
  end
end

def fix_whitespaces(str)
  str.gsub(/>([ \t]+)</, '><').
    gsub(/%>\n<\//, '%></')
end

if ARGV.size == 0
  puts "usage: haml2erb [files]"
  exit
end

ARGV.each do |filename|
  content = File.open(filename).read
  erb_engine = ErbEngine.new(content)
  erbized = fix_whitespaces(erb_engine.render)
  
  new_filename = filename.gsub('haml', 'html.erb').gsub('html.html', 'html')
  
  puts "writing to file #{new_filename}"
  File.open(new_filename, "w").write(erbized)
end

For newer Haml versions, you must replace push_script definition to

def push_script(text, opts = {} )

because API was changed