export subscription list of Qiita Advent Calendar as OPML
// ==UserScript==
// @name Qiita Advent Calendar Feed Export
// @namespace https://fuwa.dev
// @version 2024-11-30
// @description export subscription list of Qiita Advent Calendar as OPML
// @author fuwa2003
// @match https://qiita.com/advent-calendar/*/feed
// @icon https://www.google.com/s2/favicons?sz=64&domain=qiita.com
// @grant none
// ==/UserScript==
(function() {
'use strict';
// https://stackoverflow.com/questions/3665115/how-to-create-a-file-in-memory-for-user-to-download-but-not-through-server
function download(filename, text) {
const element = document.createElement('a');
element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
element.setAttribute('download', filename);
element.style.display = 'none';
document.body.appendChild(element);
element.click();
document.body.removeChild(element);
}
function run() {
const entries = Array.from(document.querySelectorAll('main > div > section ol li > div a'))
.map((a) => ({
text: a.innerText + " Advent Calendar - Qiita",
href: a.href,
}));
const entries_text = entries.map((entry) => (
` <outline title="${entry.text}" text="${entry.text}" type="rss" xmlUrl="${entry.href}/feed" />`
)).join('\n');
const opml = `
<?xml version="1.0" encoding="UTF-8"?>
<opml version="1.0">
<head>
<title>Qiita Advent Calendar subscriptions</title>
</head>
<body>
${entries_text}
</body>
</opml>
`.trim();
// download file
download('qiita.opml', opml);
}
const btn = document.createElement('button');
btn.innerText = 'Export OPML';
btn.addEventListener('click', run);
document.querySelector('main > div > section').prepend(btn);
console.log(btn);
// when btn removed, add again
btn.addEventListener('DOMNodeRemoved', (e) => {
console.log('removed', e);
setTimeout(() => {
document.querySelector('main > div > section').prepend(btn);
}, 100);
});
})();