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var allMyPosts = document.getElementsByClassName("highlightPost");
var allReplies = 0;
var sawReplies = 0;
var responded = false;

for (let i = 0; i < allMyPosts.length; i++) {
    if (allMyPosts[i].getElementsByClassName("backlink")[0].innerText.length > 0) {
        sawReplies += 1;
    }
}

function containsNumber(str) {
    return /\d/.test(str);
}

const changeFavicon = link => {
    let $favicon = document.querySelector('link[rel="icon"]');
    if ($favicon !== null) {
        $favicon.href = link;
    } else {
        $favicon = document.createElement("link");
        $favicon.rel = "icon";
        $favicon.href = link;
        document.head.appendChild($favicon);
    }
}

window.setInterval(function () {
    let newPosts = 0;

    if (containsNumber(document.title[1])) {
        let num = document.title[1];
        if (containsNumber(document.title[2])) num += document.title[2];
        if (containsNumber(document.title[3])) num += document.title[3];
        num = parseInt(num);
        if (num > newPosts) newPosts = num;

        allMyPosts = document.getElementsByClassName("highlightPost");

        for (let i = 0; i < allMyPosts.length; i++) {
            if (allMyPosts[i].getElementsByClassName("backlink")[0].innerText.length > 0) allReplies += 1;
        }

        if (allReplies > sawReplies) {
            responded = true;
        }
    }
    else {
        sawReplies = allReplies;
        responded = false;
    }

    if (responded) changeFavicon("https://i.ibb.co/8DbD9S2/cbimage.gif");
    else changeFavicon("https://karachan.org/favicon.ico");
}, 5000);