code: def set_special(index, color, iterm_name="h", alpha=100):
      
      if OS == "Darwin" and iterm_name:
          return "\033]P%s%s\033\\" % (iterm_name, color.strip("#"))
  
      if index in [11, 708] and alpha != "100":
          return "\033]%s;[%s]%s\033\\" % (index, alpha, color)
  
      return "\033]%s;%s\033\\" % (index, color)
docs: Convert a hex color to a special sequence.