rework [batch_number]/[generation_number] filename patterns

re_pattern = re.compile(r"(.*?)(?:\[([^\[\]]+)\]|$)")

re_pattern_arg = re.compile(r"(.*)<([^>]*)>$")

max_filename_part_length = 128

NOTHING_AND_SKIP_PREVIOUS_TEXT = object()

def sanitize_filename_part(text, replace_spaces=True):

        'prompt_no_styles': lambda self: self.prompt_no_style(),

        'prompt_spaces': lambda self: sanitize_filename_part(self.prompt, replace_spaces=False),

        'prompt_words': lambda self: self.prompt_words(),

        'batch_number': lambda self: self.p.batch_index + 1,

        'generation_number': lambda self: self.p.iteration * self.p.batch_size + self.p.batch_index + 1,

        'hasprompt': lambda self, *args: self.hasprompt(*args), #accept formats:[hasprompt<prompt1|default><prompt2>..]

        'batch_number': lambda self: NOTHING_AND_SKIP_PREVIOUS_TEXT if self.p.batch_size == 1 else self.p.batch_index + 1,

        'generation_number': lambda self: NOTHING_AND_SKIP_PREVIOUS_TEXT if self.p.n_iter == 1 and self.p.batch_size == 1 else self.p.iteration * self.p.batch_size + self.p.batch_index + 1,

        'hasprompt': lambda self, *args: self.hasprompt(*args),  # accepts formats:[hasprompt<prompt1|default><prompt2>..]

        'clip_skip': lambda self: opts.data["CLIP_stop_at_last_layers"],

    }

    default_time_format = '%Y%m%d%H%M%S'

        for m in re_pattern.finditer(x):

            text, pattern = m.groups()

            if pattern is not None and (pattern.lower() == 'batch_number' and self.p.batch_size == 1 or pattern.lower() == 'generation_number' and self.p.n_iter == 1 and self.p.batch_size == 1):

                continue

            res += text

            if pattern is None:

                res += text

                continue

            pattern_args = []

                    print(f"Error adding [{pattern}] to filename", file=sys.stderr)

                    print(traceback.format_exc(), file=sys.stderr)

                if replacement is not None:

                    res += str(replacement)

                if replacement == NOTHING_AND_SKIP_PREVIOUS_TEXT:

                    continue

                elif replacement is not None:

                    res += text + str(replacement)

                    continue

            res += f'[{pattern}]'

            res += f'{text}[{pattern}]'

        return res