class Utils::InteractiveSearch

def getc
  system 'stty raw -echo'
  c = STDIN.getc
  system 'stty cooked echo'
  case c
  when "\x03", "\e"
    false
  when ?\r
    true
  when "\x7f"
    @answer.chop!
    nil
  when "\v"
    @answer.clear
  when /\A[\x00-\x1f]\z/
    nil
  else
    @answer << c
    nil
  end
end

def initialize(query:, found:, output: STDOUT, prompt: 'Search? %s')
  @query  = query
  @found  = found
  @output = output
  @prompt = prompt
  @answer = ''
end

def start
  @output.print clear_screen
  loop do
    @output.print move_home(@prompt % @answer)
    case getc
    when true
      @output.print clear_screen move_home reset
      return !!@found.(@answer)
    when false
      return false
    end
    result = @query.(@answer)
    @output.print clear_screen
    unless @answer.empty?
      @output.print clear_screen move_to_line(2, result)
    end
  end
end