class Byebug::EditCommand

def execute
  file, line = location(@match[1])
  return edit_error("not_exist", file) unless File.exist?(file)
  return edit_error("not_readable", file) unless File.readable?(file)
  cmd = line ? "#{editor} +#{line} #{file}" : "#{editor} #{file}"
  Kernel.system(cmd)
end