# File lib/cheat.rb, line 157
  def edit(sheet_yaml)
    sheet = YAML.load(sheet_yaml).to_a.first
    sheet[-1] = sheet.last.gsub("\r", '')
    body, title = write_to_tempfile(*sheet), sheet.first
    return if body.strip == sheet.last.strip
    res = post_sheet(title, body)
    check_errors(res, title, body)
  end