docs: def output_format_lock(self, packages, **kwargs):
          """ Text to lock file """
          self._output_config['type'] = PLAIN
          text = ''
          tmp_packages = OrderedDict()
          columns = self._config.get_columns()
          widths = {}
          for _pkg in packages.values():
              _pkg_name = _pkg.package_name
              _params = _pkg.get_params(columns, merged=True, raw=False)
              if _pkg_name not in tmp_packages:
                  tmp_packages[_pkg_name] = _params
                  comment = 1
                  for _col in columns:
                      widths[_col] = max(widths.get(_col, len(_col)), len(str(_params.get(_col, '')))) + comment
                      comment = 0
          comment = 1
          for _col in columns:
              text += '{}{} '.format(_col, ' ' * (widths[_col] - len(_col) - comment))
              comment = 0
          text = '#{}\n'.format(text.strip())
          for _pkg_name in sorted(tmp_packages, key=lambda x: str(x).lower()):
              _pkg = tmp_packages[_pkg_name]
              line = ''
              for _col in columns:
                  line += '{}{} '.format(_pkg[_col], ' ' * (widths[_col] - len(str(_pkg[_col]))))
              text += '{}\n'.format(line.strip())
          return text