# Responsible for creating a file and creating error messages which we can present back to the user if it failed
class FileCreator
  class Error < StandardError; end
  attr_reader :error
  def create(file_name)
    File.new(file_name, 'w')
  rescue Errno::EACCES
    raise Error, "You do not have permission to write to that location (#{file_name})"
  rescue Errno::EISDIR
    raise Error, "File name is a directory (#{file_name})"
  rescue Errno::ENOTDIR
    raise Error, "File name refers to a directory which does not exist (#{file_name})"
  end
  # Errno errors handle error numbers returned by the operating system and translate them into rubyish errors
  # Therefore there may be slightly different errors on different operating systems,
  # but hopefully the ones we care about are generally applicable: http://ruby-doc.org/core/Errno.html
end