docs: def char(self, char):
          """
          Shows all system fonts that contain given character.
          """
          font_files = fc.query()
          if self._display['group']:
              font_files = self._getCharFont(font_files, char)
              font_families = self._groupFontByFamily(font_files)
              for font_family in sorted(font_families):
                  print(font_family)
                  if self._display['list']:
                      for font_file in font_families[font_family]:
                          print('  '+font_file)
              self._fontSummary(len(font_files), len(font_families))
          else:
              font_files = self._getCharFont(font_files, char)
              for font_file in sorted(font_files):
                  print(font_file)
              self._fontSummary(len(font_files))