def unfold(card)
      unfolded = []

      prior_line = nil
      card.lines do |line|
        line.chomp!
        # If it's a continuation line, add it to the last.
        # If it's an empty line, drop it from the input.
        if line =~ /^[ \t]/
          unfolded[-1] << line[1, line.size-1]
        elsif line =~ /(^BEGIN:VCARD$)|(^END:VCARD$)/
        elsif prior_line && (prior_line =~ UNTERMINATED_QUOTED_PRINTABLE)
          # Strip the trailing = off prior line, then append current line
          unfolded[-1] = prior_line[0, prior_line.length-1] + line
        elsif line =~ /^$/
        else
          unfolded << line
        end
        prior_line = unfolded[-1]
      end

      unfolded
    end
def unfold(card)
      unfolded = []

      prior_line = nil
      card.lines do |line|
        line.chomp!
        # If it's a continuation line, add it to the last.
        # If it's an empty line, drop it from the input.
        if line =~ /^[ \t]/
          unfolded[-1] << line[1, line.size-1]
        elsif line =~ /(^BEGIN:VCARD$)|(^END:VCARD$)/
        elsif prior_line && (prior_line =~ UNTERMINATED_QUOTED_PRINTABLE)
          # Strip the trailing = off prior line, then append current line
          unfolded[-1] = prior_line[0, prior_line.length-1] + line
        elsif line =~ /^$/
        else
          unfolded << line
        end
        prior_line = unfolded[-1]
      end

      unfolded
    end
Split on \r\n or \n to get the lines, unfold continued lines (they
 start with " " or \t), and return the array of unfolded lines.

 Strip away BEGIN:VCARD and END:VCARD

 This also supports the (invalid) encoding convention of allowing empty
 lines to be inserted for readability - it does this by dropping zero-length
 lines.
 Borrowed from https://github.com/qoobaa/vcard