subs_download.js

(function() {
    'use strict';
    function download(filename, data) {
        var pom = document.createElement('a');
        pom.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(data));
        pom.setAttribute('download', filename);

        if (document.createEvent) {
            var event = document.createEvent('MouseEvents');
            event.initEvent('click', true, true);
            pom.dispatchEvent(event);
        }
        else {
            pom.click();
        }
    }

    function DownloadSub() {
        let pagesNumber = document.querySelectorAll('.chic-pages ul li').length;
        let url = `${document.location.protocol}//${document.location.host}${document.location.pathname}`;

        let subs = Array.from({length: pagesNumber}, (x,i) => i + 1).map((pageNumber) => {
            return fetch(`${url}?Orig_page=${pageNumber}`).then((response) => {
                return response.text();
            }).then((text) => {
                let parser = new DOMParser();
                let doc = parser.parseFromString(text, 'text/html');
                let subText = Array.from(doc.querySelectorAll(".t div:nth-child(1) .text")).map(e => e.innerText);
                let timingsStart = Array.from(doc.querySelectorAll("#Tr span.t1")).map(e => e.innerText);
                let timingsEnd = Array.from(doc.querySelectorAll("#Tr span.t2")).map(e => e.innerText);
                let normalizeTime = (time) => {
                    var res = time.replace(".", ",");
                    if (res.match(/:/g).length == 1) {
                        return "00:"+res;
                    } else {
                        return res;
                    }
                };
                return subText.map((t, i) => {
                    return {
                        text: t.replace("\n\n","\n"),
                        start: normalizeTime(timingsStart[i]),
                        end: normalizeTime(timingsEnd[i])
                    };
                });
            });
        });

        Promise.all(subs).then((allPromises) => {
            let allSubs = allPromises.reduce((acc, val) => acc.concat(val), []);
            let text = allSubs.map((s, i) => `${i+1}\n${s.start} --> ${s.end}\n${s.text}`).join("\n\n");
            download("subs.srt", text);
        });
    }
    let downloadButton = document.createElement("div");
    downloadButton.innerHTML = "Download sub";
    downloadButton.classList.add("group", "btn", "btn-small");
    downloadButton.addEventListener("click", DownloadSub);
    let element = document.querySelector("#tb-main div div.tb-progress");
    element.parentNode.insertBefore(downloadButton, element.nextSibling);
})();