Пятничный трекер13.11.2022 13:47

(function () {
    function injectTracker() {

        const MAX_TRACKS = 10;

        // To add the tracker as a first block on the right sidebar, change "false" to "true"
        const insertAsFirstBlock = false;

        // set "true" if you want to tract articles only with unseen comments
        const onlyWithUnseenComments = false;

        // styling
        const trackerBlockCss = ``;

        const deleteSvg = '';
        const refeshSvg = '';

        const oldTrackerBlock = animateRefreshIcon();

        fetch('https://habr.com/ru/tracker/')
            .then(response => response.text())
            .then(response => processTracker(response));

        function processTracker(response) {
            const m = response.match(/]+id="tracker_feed_form"[^>]*>(.*?)<\/form>/s);
            if (!m)
                return;

            const d = document.querySelector('.sidebar_right');
            if (!d)
                return;

            oldTrackerBlock?.parentNode.removeChild(oldTrackerBlock);

            const parseDiv = document.createElement("div");
            parseDiv.innerHTML = m[1];

            const newDiv = addNewElement(d, 'div', 'default-block default-block_sidebar block-tracker', trackerBlockCss, insertAsFirstBlock);

            const headerDiv = addNewElement(newDiv, 'div', 'default-block__header', 'Tracker ' + refeshSvg + ' ');
            headerDiv.querySelector('.tracker-refresh-btn').addEventListener('click', injectTracker);

            const newContent = addNewElement(newDiv, 'div', 'default-block__content');
            const newUl = addNewElement(newContent, 'ul', 'content-list content-list_most-read');

            let currentTrack = 0;

            [...parseDiv.querySelectorAll('table.tracker-table tr')].filter(el => {
                if (currentTrack >= MAX_TRACKS)
                    return false;

                currentTrack += addTrack(el, newUl);
            });

            if (currentTrack === 0)
                addNewElement(newContent, 'div', '', onlyWithUnseenComments ? 'No articles with new comments' : 'No articles to track');

            parseDiv.remove();
        }

        function addTrack(el, newUl) {
            let firstTd = el.querySelector('td:nth-child(1)');
            if (!firstTd)
                return 0;

            const trackerHtml = el.querySelector('td:nth-child(3)')?.innerHTML;

            if (onlyWithUnseenComments && !trackerHtml?.includes('+'))
                return 0;

            const newLi = addNewElement(newUl, 'li', 'content-list__item content-list__item_devided post-info');
            const newTopDiv = addNewElement(newLi, 'div', 'tracker-stats-info');

            addNewElement(newTopDiv, 'span', 'post_author', firstTd?.innerHTML.replaceAll('${deleteSvg}`);
            newPost.querySelector('.remove-tracker').addEventListener('click', removeTracker);

            return 1;
        }

        function removeTracker(event) {

            const arctileEl = event.currentTarget.parentNode.querySelector('* > a');
            if (!arctileEl)
                return;

            const m = arctileEl.getAttribute('href')?.match(/\/([0-9]+)\//);
            if (!m)
                return;

            const postId = m[1];

            event.currentTarget.classList.add('icon-anim');

            fetch('https://habr.com/json/tracker/feed/remove/',
                {
                    method: 'POST',
                    body: `post[${postId}]=on`,
                    headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' }
                }).then(() => injectTracker());
        }

        function addNewElement(parentElement, tageName, className, html, makeAsFirstChild) {
            const newEl = document.createElement(tageName);

            if (makeAsFirstChild)
                parentElement.insertBefore(newEl, parentElement.firstChild);
            else
                parentElement.appendChild(newEl);

            if (className)
                newEl.className = className;

            if (html)
                newEl.innerHTML = html;

            return newEl;
        }

        function animateRefreshIcon() {
            let oldTrackerBlock = document.querySelector('div.block-tracker');
            if (oldTrackerBlock)
                document.querySelector('.tracker-refresh-icon')?.classList.add('icon-anim');

            return oldTrackerBlock;
        }
    }

    injectTracker();
})();