module Haml::Version

def version
  return @@version if defined?(@@version)
  numbers = File.read(scope('VERSION')).strip.split('.').map { |n| n.to_i }
  name = File.read(scope('VERSION_NAME')).strip
  @@version = {
    :major => numbers[0],
    :minor => numbers[1],
    :teeny => numbers[2],
    :name => name
  }
  @@version[:number] = [:major, :minor, :teeny].map { |comp| @@version[comp] }.compact.join('.')
  @@version[:string] = @@version[:number].dup
  if File.exists?(scope('REVISION'))
    rev = File.read(scope('REVISION')).strip
    rev = nil if rev !~ /^([a-f0-9]+|\(.*\))$/
  end
  if (rev.nil? || rev == '(unknown)') && File.exists?(scope('.git/HEAD'))
    rev = File.read(scope('.git/HEAD')).strip
    if rev =~ /^ref: (.*)$/
      rev = File.read(scope(".git/#{$1}")).strip
    end
  end
  if rev
    @@version[:rev] = rev
    unless rev[0] == ?(
      @@version[:string] << "." << rev[0...7]
    end
    @@version[:string] << " (#{name})"
  end
  @@version
end