def get_file_history(self, path, limit=None):
        """
        Returns history of file as reversed list of ``Changeset`` objects for
        which file at given ``path`` has been modified.

        TODO: This function now uses os underlying 'git' and 'grep' commands
        which is generally not good. Should be replaced with algorithm
        iterating commits.
        """
        self._get_filectx(path)
        cs_id = safe_str(self.id)
        f_path = safe_str(path)

        if limit:
            cmd = 'log -n %s --pretty="format: %%H" -s -p %s -- "%s"' % (
                      safe_int(limit, 0), cs_id, f_path
                   )

        else:
            cmd = 'log --pretty="format: %%H" -s -p %s -- "%s"' % (
                      cs_id, f_path
                   )
        so, se = self.repository.run_git_command(cmd)
        ids = re.findall(r'[0-9a-fA-F]{40}', so)
        return [self.repository.get_changeset(id) for id in ids]
Returns history of file as reversed list of ``Changeset`` objects for
        which file at given ``path`` has been modified.

        TODO: This function now uses os underlying 'git' and 'grep' commands
        which is generally not good. Should be replaced with algorithm
        iterating commits.