docs: def load_x11_color_map(paths=X11_RGB_PATHS):
      ''' Load and parse X11's rgb.txt.
  
          Loads:
              x11_color_map: { name_lower: ('R', 'G', 'B') }
      '''
      if type(paths) is str:
          paths = (paths,)
  
      x11_color_map = color_tables.x11_color_map
      for path in paths:
          try:
              with open(path) as infile:
                  for line in infile:
                      if line.startswith('!') or line.isspace():
                          continue
  
                      tokens = line.rstrip().split(maxsplit=3)
                      key = tokens[3]
                      if ' ' in key:  # skip names with spaces to match webcolors
                          continue
  
                      x11_color_map[key.lower()] = tuple(tokens[:3])
              log.debug('X11 palette found at %r.', path)
              break
          except FileNotFoundError as err:
              log.debug('X11 palette file not found: %r', path)
          except IOError as err:
              log.debug('X11 palette file not read: %s', err)