class IRB::WorkSpace

def code_around_binding
  file, pos = @binding.source_location
  if defined?(::SCRIPT_LINES__[file]) && lines = ::SCRIPT_LINES__[file]
    code = ::SCRIPT_LINES__[file].join('')
  else
    begin
      code = File.read(file)
    rescue SystemCallError
      return
    end
  end
  lines = Color.colorize_code(code).lines
  pos -= 1
  start_pos = [pos - 5, 0].max
  end_pos   = [pos + 5, lines.size - 1].min
  line_number_fmt = Color.colorize("%#{end_pos.to_s.length}d", [:BLUE, :BOLD])
  fmt = " %2s #{line_number_fmt}: %s"
  body = (start_pos..end_pos).map do |current_pos|
    sprintf(fmt, pos == current_pos ? '=>' : '', current_pos + 1, lines[current_pos])
  end.join("")
  "\nFrom: #{file} @ line #{pos + 1} :\n\n#{body}#{Color.clear}\n"
end