utils.rb

    def align(string)
      lines = string.split(/\n/)
      first = lines.shift
      match = /^(\s*)<<</.match(first)
      unless(match.nil?)
        return lines.map do |line|
          unless /^#{match[1]}|^\s*$/ =~ line
            raise Errors::UnderIndented, line
          end
          line.sub(/^#{match[1]}/, "")
        end.join("\n")
      end
      return string
    end

Use like: 

align(<<-EOS)
<<<
Some left aligned
  text
EOS

And know that no matter how the heredoc gets intented, the string that results will be left aligned to the <<<