Taiwan ISRC to MusicBrainz

Adds a link to any isrc.ncl.edu.tw record entry page that opens the Add Release form in MusicBrainz, prefilling it with that record's information.
目前為 2019-05-15 提交的版本，檢視最新版本。
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換行
// ==UserScript==
// @name            Taiwan ISRC to MusicBrainz
// @version         1.0.0
// @namespace       http://www.agj.cl/
// @description     Adds a link to any isrc.ncl.edu.tw record entry page that opens the Add Release form in MusicBrainz, prefilling it with that record's information.
// @license         Unlicense
// @include         http*://isrc.ncl.edu.tw/music_view.aspx*
// @grant           none
// ==/UserScript==


(() => {
'use strict';

// Utilities.

const sel = document.querySelector.bind(document);
const selAll = document.querySelectorAll.bind(document);
const selIn = (el, selector) => el.querySelector(selector);
const get = prop => obj => obj[prop];
const call = (method, ...args) => obj => obj[method](...args);
const esc = encodeURIComponent;
const dom = (tag, attrs, ...children) => {
    const el = document.createElement(tag);
    if (attrs) Object.keys(attrs).forEach(attr => el.setAttribute(attr, attrs[attr]));
    children.map(obj => typeof obj === 'string' ? document.createTextNode(obj) : obj)
        .forEach(node => el.appendChild(node));
    return el;
};
const counter = () => { let i = 0; return () => i++ };
const flatten = list => list.reduce((r, item) => Array.isArray(item) ? r.concat(flatten(item)) : r.concat([item]), []);


// Get values.

const values =
    Array.from(selAll('.musicView > table > tbody > tr'))
    .reduce((r, el) => {
        const label = selIn(el, 'th').textContent.trim();
        const value = selIn(el, 'td').textContent.trim().replace(/^:\s+(\S.*)$/, '$1');
        if      (/表演者/.test(label))   r.artist = value;
        else if (/樂團名稱/.test(label)) r.artist = value;
        else if (/專輯名稱/.test(label)) r.title = value;
        else if (/發行公司/.test(label)) r.label = value;
        else if (/產品編碼/.test(label)) r.cat = value;
        else if (/EAN碼/.test(label))   r.barcode = value;
        else if (/發行日期/.test(label)) r.date = value.split('/');
        return r;
    }, {});
values.tracks = Array.from(selAll('.AllMusic > fieldset > a'))
                .map(get('textContent'))
                .map(call('trim'))
                .map(t => t.replace(/^.+ ] 曲目名稱:(.*)$/, '$1'));


// Add submit link.

const checkValue = (value) => value === undefined ? '' : value;
const input = (name, value) => dom('input', { name: name, value: checkValue(value), type: 'text' });

const link = dom('a', null, 'Add to MusicBrainz');
const form = dom('form', { name: 'musicbrainz-submit', action: 'https://musicbrainz.org/release/add', method: 'post', 'accept-charset': 'utf-8', style: 'display: none' },
                input('name', values.title),
                input('artist_credit.names.0.name', values.artist),
                input('labels.0.name', values.label),
                input('labels.0.catalog_number', values.cat),
                input('events.0.date.year', values.date[0]),
                input('events.0.date.month', values.date[1]),
                input('events.0.country', 'TW'),
                input('barcode', values.barcode),
                input('urls.0.url', window.location.href),
                input('urls.0.link_type', '82'),
                input('language', 'cmn'),
                input('script', 'Hant'),
                input('status', 'official'),
                input('mediums.0.format', 'cd'),
                input('edit_note', 'From Taiwan ISRC: ' + window.location.href)
             );
const container = dom('div', { id: 'musicbrainz-submit' }, link, form);

const trackCount = counter();
flatten(values.tracks
        .map(title => {
            const i = trackCount();
            return [input(`mediums.0.track.${ i }.name`, title),
                    input(`mediums.0.track.${ i }.number`, i + 1)];
        }))
.map(el => form.appendChild(el));

sel('#mainContent > div').prepend(container);
link.addEventListener('click', e => {
    form.submit();
    e.preventDefault();
});

sel('head').append(dom('style', null, `
    #musicbrainz-submit {
        display: inline-flex;
        vertical-align: bottom;
        margin-right: 20px;
        height: 42px;
        align-items: center;
    }
    #musicbrainz-submit a {
        cursor: pointer;
        font-size: 14px;
        font-weight: bold;
    }
`));

})();
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