Copy results of Taipei traffic violation reports from Gmail web page to the clipboard.

copy_result.js

/**
 * Usage:
 *  1. Minify this script.
 *  2. Rewrite minified script to `javascript:THE_MINIFIED_SCIPT`.
 *  3. Add modified script to your bookmark.
 *  4. Click it when you're at the Gmail page.
 */

(async function () {
  if (location.hostname != 'mail.google.com') return;

  async function sleep(ms) {
    await new Promise((resolve) => setTimeout(resolve, ms));
  }

  function format (content) {
    let checkers = [
      [/.+?檢舉\s+?([\w-]+)\s+?號車.+?案號[\s：]+?([\w-]+).*/, '案號：$2\n車號：$1'],
      [/.*?違規地點[\s：]+?(\S.*?)\s*$/, '違規地點:$1'],
      [/.*?違規事實.+?(支道未讓幹道|轉彎車未讓直行車|未讓行人|不讓行進中之車輛).*/, '違規事實:$1'],
      [/.*?處理結果[\s：]+?(\S.*?)\s*$/, '處理結果:$1'],
      [/.*?承辦員警[\s：]+?(\S.*?)\s*$/, '承辦員警:$1'],
      [/.*?連絡電話[\s：]+?(\S.*?)\s*$/, '連絡電話:$1'],
    ];
    let matches = Array(checkers.length).fill(0).map(_ => [])
    for (let line of content.split('\n')) {
      let hasChecker = false;
      checkers.some((checker, i) => {
        if (!checker) return false;
        hasChecker = true;
        let match = line.replace(...checker);
        if (match.length === line.length) return false;
        matches[i] = match.split('\n');
        checkers[i] = false;
        return true;
      });
      if (!hasChecker) break;
    }
    if (matches.every(m => m.length)) return matches.map(m=>m.join('\n')).join('\n');
    return '';
  }

  let folded = 0;
  let elm = document.querySelector('span[role="button"][aria-label*="較舊的郵件"]:not([tabindex])');
  if (elm) folded = parseInt(elm.getAttribute('aria-label'), 10);
  let ls = document.querySelectorAll('[role="list"] > [role="listitem"]');
  let total = folded + ls.length;

  if (elm) elm.click();
  while (ls.length != total) {
    await sleep(100);
    ls = document.querySelectorAll('[role="list"] > [role="listitem"]');
    console.log('Cannot get all mails');
  }

  let result = await Promise.all(Array.from(ls).map(async function (elm) {
    let content;
    if (!elm.querySelector('[data-message-id][style=""]')) { // not opened
      elm.querySelector('table').click();
      content = elm.querySelector('[class*="msg"]');
      while (!content) {
        await sleep(100);
        content = elm.querySelector('[class*="msg"]');
        console.log('Cannot find content container.', elm);
      }
    } else {
      content = elm.querySelector('[class*="msg"]');
    }
    return format(content.innerText);
  }));
  result = result.filter(s => s).join('\n\n');
  console.log(result);
  if (result) {
    try {
      await navigator.clipboard.writeText(result);
      alert('結果已複製到剪貼簿');
    } catch {
      // DOM has to be focused when using the clipboard API 
      alert('複製失敗，請點擊網頁後再試一次');
    }
  }
})() && undefined; // prevent from navigation