docs: def detect_unicode_support():
      ''' Try to detect unicode (utf8?) support in the terminal.
  
          Experimental, implementation idea is from the link below:
             https://unix.stackexchange.com/questions/184345/detect-how-much-of-unicode-my-terminal-supports-even-through-screen
  
          TODO:
              needs improvement.
              # should return None or True on redirection?
  
          Returns:
              Boolean | None if not a TTY
      '''
      result = None
  
      if env.LANG and env.LANG.endswith('UTF-8'):  # approximation
          result = True
  
      elif is_a_tty():
          if os_name == 'nt':
              from .windows import get_position as _get_position
          else:
              _get_position = get_position
  
          out = sys.stdout
          # what if cursor is not at beginning of line?
          x, _ = _get_position()
          out.write('é')
          out.flush()
          x2, _ = _get_position()
  
          difference = x2 - x
          if difference == 1:
              result = True
          else:
              result = False  # 0, 2 - no
  
          # clean up
          out.write(BS)
          out.flush()
  
      return result