[User Script] Convert Gmail Quote Attribution to English

gmail-quote-english.user.js

// ==UserScript==
// @name         Convert Gmail Quote Attribution to English
// @namespace    http://tampermonkey.net/
// @version      0.2.0
// @description  Convert Gmail's attribution line for automatically quoted messages to format in English.
// @author       prin
// @license      MIT
// @match        *://mail.google.com/*
// @match        *://gmail.com/*
// @run-at       context-menu
// @updateURL    https://gist.github.com/prinsss/02f9bdec3782495a1d76ba533f866f08/raw/gmail-quote-english.user.js
// @downloadURL  https://gist.github.com/prinsss/02f9bdec3782495a1d76ba533f866f08/raw/gmail-quote-english.user.js
// @homepage     https://gist.github.com/prinsss/02f9bdec3782495a1d76ba533f866f08
// @grant        none
// @require      https://cdn.jsdelivr.net/npm/moment@2.29.4/moment.js
// @require      https://cdn.jsdelivr.net/npm/moment@2.29.4/locale/zh-cn.js
// ==/UserScript==

(function () {
  'use strict';

  // By default, Gmail will quote all previous messages when you reply to an e-mail,
  // and add an attribution line indicating following quoted content.
  // Yup, it's a good practice to include a copy of original messages though,
  // (FYI: https://en.wikipedia.org/wiki/Posting_style#Attribution_lines )
  // the attribution line added by Gmail will differ in different locales.

  // e.g. We will get something like this if you set your language to English,
  // "On Mon, Dec 16, 2019 at 3:00 PM Amazon.co.jp <digital-no-reply@amazon.co.jp> wrote:"
  // while on Chinese interfaces it will be like
  // "Amazon.co.jp <digital-no-reply@amazon.co.jp> 于2019年12月16日周一 下午3:00写道："
  // which could be kinda odd in an English conversation.

  // So here I wrote this script to help you transform the auto-generated
  // attribution to English format. Hope this helps. ;)

  // Updated on 2023/09/14, the current format is like this:
  // zh_Hans: Pocket Support Team <support@getpocket.com> 于2023年9月14日周四 03:47写道：
  // HTML: Pocket Support Team &lt;<a href="mailto:support@getpocket.com" target="_blank">support@getpocket.com</a>&gt; 于2023年9月14日周四 03:47写道：<br>
  // en_US: On Thu, Sep 14, 2023 at 3:47 AM Pocket Support Team <support@getpocket.com> wrote:

  function replaceQuoteAttr(str) {
    const regex = /(.+?)\s*(&lt;|<)(.+@.+)(&gt;|>)\s*于\s*(.+)写道：/;

    const parsed = regex.exec(str);
    console.log({ regex, str, parsed });

    if (!parsed) {
      throw new Error(`Can't extract information from text:\n\n${str}`);
    }

    // 0: "Pocket Support Team <support@getpocket.com> 于2023年9月14日周四 03:47写道："
    // 1: "Pocket Support Team"
    // 2: "<"
    // 3: "support@getpocket.com"
    // 4: ">"
    // 5: "2023年9月14日周四 03:47"
    const [match, sender, lt, address, gt, date] = parsed;

    // Here we use U+202f "NARROW NO-BREAK SPACE" before AM/PM like Gmail does
    // "2023年9月14日周四 03:47" => "Thu, Sep 14, 2023 at 3:47 AM"
    const dateNewFormat = moment(date, 'YYYY[年]M[月]D[日]ddd HH:mm', 'zh-cn', true)
      .locale('en')
      .format('ddd, MMM D, YYYY [at] h:mm A');

    // Use "<" or "&lt;" depends on the original text
    const attrEnglish = `On ${dateNewFormat} ${sender} ${lt}${address}${gt} wrote:`;

    console.log({ match, attrEnglish });
    return { match, attrEnglish };
  }

  const ele = document.querySelector('div[role="textbox"] > .gmail_quote .gmail_attr');

  if (!ele) {
    const message =
      'Can not find the attribution line.\n\n' +
      'Please click the 3 dots to show trimmed quote, which contains attribution line in Chinese.\n\n' +
      'Press "Cancel" to stop or "OK" to enter the text manually.';

    if (window.confirm(message)) {
      const text = window.prompt('Please enter the attribution text in Chinese:');
      if (text) {
        try {
          const { attrEnglish } = replaceQuoteAttr(text);
          window.alert(attrEnglish);
        } catch (err) {
          window.alert(err.message);
        }
      }
    }
    return;
  }

  try {
    const { match, attrEnglish } = replaceQuoteAttr(ele.innerHTML);

    if (window.confirm(`Would you like to replace\n\n"${match}" with\n\n"${attrEnglish}" ?`)) {
      // Replace only first occurrence
      ele.innerHTML = ele.innerHTML.replace(match, attrEnglish);
    }
  } catch (err) {
    window.alert(err.message);
  }
})();