class Byebug::UndisplayCommand

def self.description
  <<-DESCRIPTION
    undisp[lay][ nnn]
    #{short_description}
    Arguments are the code numbers of the expressions to stop displaying. No
    argument means cancel all automatic-display expressions. Type "info
    display" to see the current list of code numbers.
  DESCRIPTION
end

def self.regexp
  /^\s* undisp(?:lay)? (?:\s+(\S+))? \s*$/x
end

def self.short_description
  "Stops displaying all or some expressions when program stops"
end

def execute
  if @match[1]
    pos, err = get_int(@match[1], "Undisplay", 1, Byebug.displays.size)
    return errmsg(err) unless err.nil?
    last_display = Byebug.displays[pos - 1]
    return errmsg(pr("display.errors.undefined", expr: pos)) unless last_display
    last_display[0] = nil
  else
    return unless confirm(pr("display.confirmations.clear_all"))
    Byebug.displays.each { |d| d[0] = false }
  end
end