Nozomi infinite scroll

Adds support for infinite scrolling on Nozomi.la
当前为 2023-10-05 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Nozomi infinite scroll
// @namespace    http://tampermonkey.net/
// @version      0.9
// @description  Adds support for infinite scrolling on Nozomi.la
// @author       BicHD
// @match        https://*nozomi.la/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=nozomi.la
// @grant        none
// ==/UserScript==

var page_number = Number(window.location.pathname.replace(/.+-(\d+)\.html/,"$1")) || Number(window.location.hash.substr(1)) || 1
var posts = [] // Use the posts array
const tns_per_page = 64
const popular = window.location.pathname.toLocaleLowerCase().includes("popular") ? "-Popular" : "";
const post_urls = /search(?:-Popular)?\.html/.test(window.location.pathname) ? new URL(window.location.href).searchParams.get("q").split(" ").reduce((urls, str) => {
    urls[str] = `https://j.nozomi.la/nozomi/${popular ? "popular/" : ""}${str.startsWith("-") ? str.slice(1) : str}${popular}.nozomi`;
    return urls;
}, {})
: { index: `https://n.nozomi.la/index${popular}.nozomi`};

async function get_json(post_id) {
    let response = await fetch(`//j.nozomi.la/post/${post_id.length < 3 ? post_id : (post_id.toString().replace(/^(.*(..)(.))/, '$3/$2/$1'))}.json`, {
        method: 'GET',
        headers: {'origin': "https://nozomi.la"},})
    const postData = await response.json();
    posts.push(postData);
}


async function scroll_handler() {
    let scrollTop = (typeof pageYOffset != "undefined") ? pageYOffset : document.documentElement.scrollTop
    if (!(document.documentElement.scrollHeight - scrollTop - document.documentElement.clientHeight < 58 && document.querySelector('#loader-content.hidden'))) return
    document.getElementById('loader-content').classList.remove('hidden')
    page_number += 1

    if (Object.keys(post_urls).length == 1 && Object.keys(post_urls) == "index" && !Object.values(post_urls)[0].includes("/nozomi/")) {
        let start_byte = (page_number - 1) * tns_per_page * 4;
        let end_byte = start_byte + tns_per_page * 4 - 1;

        await get_post_range(post_urls.index, start_byte, end_byte)
    } else {
        let jsonPromises = [];
        trim_array(stored_postids).forEach(post_id => {
            jsonPromises.push(get_json(post_id))
        })

        await Promise.all(jsonPromises);
    }

    posts_to_page(posts)

    posts = []
    document.getElementById('loader-content').classList.add('hidden')
}

async function get_post_range(url, start_byte, end_byte) {
    let response = await fetch(url, {
        method: 'GET',
        headers: {'Range': `bytes=${start_byte}-${end_byte}`,'origin': "https://nozomi.la"},
    })

    if (!response.ok) {
        document.getElementById('loader-content').classList.add('hidden')
        document.removeEventListener("scrollend", scroll_handler)
        return;
    }

    let view = new DataView(await response.arrayBuffer());
    let jsonPromises = [];
    for (let i = 0; i < view.byteLength / 4; i++) {
        let post_id = view.getUint32(i * 4, false /* big-endian */)
        jsonPromises.push(get_json(post_id));
    }

    await Promise.all(jsonPromises);
}

function posts_to_page(posts) {
    posts.forEach(post => {
        var c = document.querySelector(".content")
        if (c) {
            var s = c.clientWidth;

            var n = Math.ceil(6.0*s/1000.0);
            var w = ((s - (10.0*n + 10.0) - 0.5) / n) - 2.0;

            var divs = document.querySelectorAll(".thumbnail-div");
            for (var i = 0; i < divs.length; i++) {
                var div = divs[i];
                div.style.width=(w+"px");
                div.style.height=(w+"px");
            }
        }
        document.querySelector("#thumbnail-divs > .thumbnail-div:last-child").insertAdjacentHTML('afterend',`<div class="thumbnail-div" style="width: ${w}px; height: ${w}px;"><a href="/post/${post.postid}.html"><img class="tag-list-img" src="//tn.nozomi.la/${post.imageurls[0].dataid.replace(/^.*(..)(.)$/, '$2/$1/')}${post.imageurls[0].dataid}.${post.imageurls[0].type}.webp" title="" style=""></a></div>`);
    });
}

function trim_array(array) {
    let retval = array.slice();

    retval.splice(0, (page_number-1)*tns_per_page);
    retval.splice(tns_per_page);

    return retval;
};

document.addEventListener("scrollend", scroll_handler);