How to use nhentai - 10 common examples

args, _ = parser.parse_args(sys.argv[1:])

    if args.html_viewer:
        generate_html()
        exit(0)

    if args.main_viewer and not args.id and not args.keyword and not args.favorites:
        generate_main_html()
        exit(0)

    if args.clean_download_history:
        with DB() as db:
            db.clean_all()

        logger.info('Download history cleaned.')
        exit(0)

    if os.path.exists(constant.NHENTAI_COOKIE):
        with open(constant.NHENTAI_COOKIE, 'r') as f:
            constant.COOKIE = f.read()

    if args.cookie:
        try:
            if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            with open(constant.NHENTAI_COOKIE, 'w') as f:
                f.write(args.cookie)
        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

if args.proxy:
        try:
            if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            proxy_url = urlparse(args.proxy)
            if proxy_url.scheme not in ('http', 'https'):
                logger.error('Invalid protocol \'{0}\' of proxy, ignored'.format(proxy_url.scheme))
            else:
                with open(os.path.join(constant.NHENTAI_HOME, 'proxy'), 'w') as f:
                    f.write(args.proxy)
        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

        logger.info('Proxy \'{0}\' saved.'.format(args.proxy))
        exit(0)

    if args.favorites:
        if not constant.COOKIE:
            logger.warning('Cookie has not been set, please use `nhentai --cookie \'COOKIE\'` to set it.')
            exit(1)

    if args.id:
        _ = [i.strip() for i in args.id.split(',')]
        args.id = set(int(i) for i in _ if i.isdigit())

    if args.file:
        with open(args.file, 'r') as f:
            _ = [i.strip() for i in f.readlines()]
            args.id = set(int(i) for i in _ if i.isdigit())

title = doujinshi_info.find('h1').text
    subtitle = doujinshi_info.find('h2')

    doujinshi['name'] = title
    doujinshi['subtitle'] = subtitle.text if subtitle else ''

    doujinshi_cover = html.find('div', attrs={'id': 'cover'})
    img_id = re.search('/galleries/([\d]+)/cover\.(jpg|png|gif)$', doujinshi_cover.a.img.attrs['data-src'])

    ext = []
    for i in html.find_all('div', attrs={'class': 'thumb-container'}):
        _, ext_name = os.path.basename(i.img.attrs['data-src']).rsplit('.', 1)
        ext.append(ext_name)

    if not img_id:
        logger.critical('Tried yo get image id failed')
        exit(1)

    doujinshi['img_id'] = img_id.group(1)
    doujinshi['ext'] = ext

    pages = 0
    for _ in doujinshi_info.find_all('div', class_=''):
        pages = re.search('([\d]+) pages', _.text)
        if pages:
            pages = pages.group(1)
            break
    doujinshi['pages'] = int(pages)

    # gain information of the doujinshi
    information_fields = doujinshi_info.find_all('div', attrs={'class': 'field-name'})
    needed_fields = ['Characters', 'Artists', 'Languages', 'Tags', 'Parodies', 'Groups', 'Categories']

def doujinshi_parser(id_):
    if not isinstance(id_, (int,)) and (isinstance(id_, (str,)) and not id_.isdigit()):
        raise Exception('Doujinshi id({0}) is not valid'.format(id_))

    id_ = int(id_)
    logger.log(15, 'Fetching doujinshi information of id {0}'.format(id_))
    doujinshi = dict()
    doujinshi['id'] = id_
    url = '{0}/{1}/'.format(constant.DETAIL_URL, id_)

    try:
        response = request('get', url)
        if response.status_code in (200, ):
            response = response.content
        else:
            logger.debug('Slow down and retry ({}) ...'.format(id_))
            time.sleep(1)
            return doujinshi_parser(str(id_))

    except Exception as e:
        logger.warn('Error: {}, ignored'.format(str(e)))
        return None

    html = BeautifulSoup(response, 'html.parser')
    doujinshi_info = html.find('div', attrs={'id': 'info'})

    title = doujinshi_info.find('h1').text
    subtitle = doujinshi_info.find('h2')

    doujinshi['name'] = title
    doujinshi['subtitle'] = subtitle.text if subtitle else ''

if os.path.exists(os.path.join(constant.NHENTAI_HOME, 'cookie')):
        with open(os.path.join(constant.NHENTAI_HOME, 'cookie'), 'r') as f:
            constant.COOKIE = f.read()

    if args.cookie:
        try:
            if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            with open(os.path.join(constant.NHENTAI_HOME, 'cookie'), 'w') as f:
                f.write(args.cookie)
        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

        logger.info('Cookie saved.')
        exit(0)

    if os.path.exists(os.path.join(constant.NHENTAI_HOME, 'proxy')):
        with open(os.path.join(constant.NHENTAI_HOME, 'proxy'), 'r') as f:
            link = f.read()
            constant.PROXY = {'http': link, 'https': link}

    if args.proxy:
        try:
            if not os.path.exists(constant.NHENTAI_HOME):
                os.mkdir(constant.NHENTAI_HOME)

            proxy_url = urlparse(args.proxy)
            if proxy_url.scheme not in ('http', 'https'):
                logger.error('Invalid protocol \'{0}\' of proxy, ignored'.format(proxy_url.scheme))
            else:

def _download_callback(self, request, result):
        result, data = result
        if result == 0:
            logger.warning('fatal errors occurred, ignored')
            # exit(1)
        elif result == -1:
            logger.warning('url {} return status code 404'.format(data))
        else:
            logger.log(15, '{0} downloaded successfully'.format(data))

if proxy_url.scheme not in ('http', 'https'):
                logger.error('Invalid protocol \'{0}\' of proxy, ignored'.format(proxy_url.scheme))
            else:
                with open(constant.NHENTAI_PROXY, 'w') as f:
                    f.write(args.proxy)

        except Exception as e:
            logger.error('Cannot create NHENTAI_HOME: {}'.format(str(e)))
            exit(1)

        logger.info('Proxy \'{0}\' saved.'.format(args.proxy))
        exit(0)

    if args.favorites:
        if not constant.COOKIE:
            logger.warning('Cookie has not been set, please use `nhentai --cookie \'COOKIE\'` to set it.')
            exit(1)

    if args.id:
        _ = [i.strip() for i in args.id.split(',')]
        args.id = set(int(i) for i in _ if i.isdigit())

    if args.file:
        with open(args.file, 'r') as f:
            _ = [i.strip() for i in f.readlines()]
            args.id = set(int(i) for i in _ if i.isdigit())

    if (args.is_download or args.is_show) and not args.id and not args.keyword and not args.favorites:
        logger.critical('Doujinshi id(s) are required for downloading')
        parser.print_help()
        exit(1)

if args.favorites:
        if not constant.COOKIE:
            logger.warning('Cookie has not been set, please use `nhentai --cookie \'COOKIE\'` to set it.')
            exit(1)

    if args.id:
        _ = [i.strip() for i in args.id.split(',')]
        args.id = set(int(i) for i in _ if i.isdigit())

    if args.file:
        with open(args.file, 'r') as f:
            _ = [i.strip() for i in f.readlines()]
            args.id = set(int(i) for i in _ if i.isdigit())

    if (args.is_download or args.is_show) and not args.id and not args.keyword and not args.favorites:
        logger.critical('Doujinshi id(s) are required for downloading')
        parser.print_help()
        exit(1)

    if not args.keyword and not args.id and not  args.favorites:
        parser.print_help()
        exit(1)

    if args.threads <= 0:
        args.threads = 1

    elif args.threads > 15:
        logger.critical('Maximum number of used threads is 15')
        exit(1)

    return args

if not isinstance(id_, (int,)) and (isinstance(id_, (str,)) and not id_.isdigit()):
        raise Exception('Doujinshi id({0}) is not valid'.format(id_))

    id_ = int(id_)
    logger.log(15, 'Fetching information of doujinshi id {0}'.format(id_))
    doujinshi = dict()
    doujinshi['id'] = id_
    url = '{0}/{1}'.format(constant.DETAIL_URL, id_)
    i = 0
    while 5 > i:
        try:
            response = request('get', url).json()
        except Exception as e:
            i += 1
            if not i < 5:
                logger.critical(str(e))
                exit(1)
            continue
        break

    doujinshi['name'] = response['title']['english']
    doujinshi['subtitle'] = response['title']['japanese']
    doujinshi['img_id'] = response['media_id']
    doujinshi['ext'] = ''.join([i['t'] for i in response['images']['pages']])
    doujinshi['pages'] = len(response['images']['pages'])

    # gain information of the doujinshi
    needed_fields = ['character', 'artist', 'language', 'tag', 'parody', 'group', 'category']
    for tag in response['tags']:
        tag_type = tag['type']
        if tag_type in needed_fields:
            if tag_type == 'tag':

not args.tag and not args.artist and not args.character and \
            not args.parody and not args.group and not args.language and not args.favorites:
        logger.critical('Doujinshi id(s) are required for downloading')
        parser.print_help()
        exit(1)

    if not args.keyword and not args.id and not args.tag and not args.artist and \
            not args.character and not args.parody and not args.group and not args.language and not args.favorites:
        parser.print_help()
        exit(1)

    if args.threads <= 0:
        args.threads = 1

    elif args.threads > 15:
        logger.critical('Maximum number of used threads is 15')
        exit(1)

    return args