a_path, b_path, similarity_index, rename_from, rename_to,

        old_mode, new_mode, new_file_mode, deleted_file_mode,

        a_blob_id, b_blob_id, b_mode, a_file, b_file

    2. An iterator yielding lines with simple HTML markup.

    """

    match = None

    if vcs == 'git':

        match = _git_header_re.match(diff_chunk)

    elif vcs == 'hg':

        match = _hg_header_re.match(diff_chunk)

    if match is None:

    meta_info = {k: None if v is None else safe_str(v) for k, v in match.groupdict().items()}

    rest = diff_chunk[match.end():]

    if rest:

        if _header_next_check.match(rest):

            raise Exception('cannot parse %s diff header: %r followed by %r' % (vcs, safe_str(bytes(diff_chunk[:match.end()])), safe_str(bytes(rest[:1000]))))

        if rest[-1:] != b'\n':

            # The diff will generally already have trailing \n (and be a memoryview). It might also be huge so we don't want to allocate it twice. But in this very rare case, we don't care.

            rest = bytes(rest) + b'\n'

    diff_lines = (_escaper(safe_str(m.group(1))) for m in re.finditer(br'(.*)\n', rest))

    return meta_info, diff_lines