zachy

require 'mini_magick'

#class InvalidInputFileError < Exception; end

class Converter
  def initialize(input, output = nil)
    #FILE nebo string
    if html_file?(input)
      #resit file
      @file_input = input

zachy

require 'mini_magick'

class InvalidInputFileError < Exception; end

class Converter
  def initialize(input, output = nil)
    raise InvalidInputFileError unless html_file?(input)
    @input = input
    if @output
      @ouput = output