Some stuff to update the uni trello boards I use.

trello-update.js

// this runs every time i get to the page. it updates the list of weeks, puts the old weeks at the bottom,
// and adds a label to this week. It runs using TamperMonkey

(async () => {
  const promisify = fn => (...args) => new Promise((resolve, reject) => {
    fn(...args, resolve, reject);
  });
  // go to https://trello.com/app-key for the key
  const token = '<ENTER KEY HERE>';
  const jquery = await import('https://code.jquery.com/jquery-3.3.1.min.js');
  const trello = await import(`https://api.trello.com/1/client.js?key=${token}`);
  const BOARD_NAME = 'Semester 2, 2018';

  const auth = await new Promise((resolve, reject) => {
    Trello.authorize({
      type: 'popup',
      name: 'Getting Started Application',
      scope: {
        read: 'true',
        write: 'true' },
      expiration: 'never',
      success: resolve,
      error: reject,
    })
  })

  const get = promisify(Trello.get.bind(Trello));
  const put = promisify(Trello.put.bind(Trello));
  const post = promisify(Trello.post.bind(Trello));

  const boards = await get(`/members/davidbuchanswanson/boards`);
  const board = boards.find(b => b.name === BOARD_NAME);

  const labels = await get(`/boards/${board.id}/labels`);
  const thisWeekLabel = labels.find(l => l.name === 'This Week');

  const lists = await get(`/boards/${board.id}/lists`);
  const list = lists.find(l => l.name === 'Weeks');

  const cards = (await get(`/lists/${list.id}/cards`))
    .sort((a, b) => a.due < b.due ? -1 : 1);

  // the aim here is to look through all the cards, and find ones that are
  // before the current week. We then mark them all as done and move them to
  // the bottom of the list.
  const lastSunday = new Date();
  const delta = -lastSunday.getDay();
  lastSunday.setDate(lastSunday.getDate() + delta);

  const past = cards
    .filter(c => new Date(c.due) < lastSunday);

  await past.reduce((p, card) => 
    p.then(() => put(`/cards/${card.id}`, { pos: 'bottom', dueComplete: true })),
    Promise.resolve(),
  );

  // finally, even though 'This Week' will *always* be the top card, we're going
  // to add a label that says that for some extra effect.
  // We'll also mark it as 'done' so that it has the green date

  // find works optimistically, so it will stop at the first it finds
  const thisWeek = cards.find(c => new Date(c.due) > lastSunday);

  await put(`/cards/${thisWeek.id}`, { dueComplete: true, idLabels: thisWeekLabel.id });
})();

trello.js

// this runs as a once off. paste into chrome snippets and hit run.
// this adds all the weeks to the 'weeks' column so i can keep track of what
// week I'm currently in

(async () => {
  const promisify = fn => (...args) => new Promise((resolve, reject) => {
    fn(...args, resolve, reject);
  });
  // go to https://trello.com/app-key for the key
  const token = '<ENTER KEY HERE>';
  const jquery = await import('https://code.jquery.com/jquery-3.3.1.min.js');
  const trello = await import(`https://api.trello.com/1/client.js?key=${token}`);
  const BOARD_NAME = 'Semester 2, 2018';

  const auth = await new Promise((resolve, reject) => {
    Trello.authorize({
      type: 'popup',
      name: 'Getting Started Application',
      scope: {
        read: 'true',
        write: 'true' },
      expiration: 'never',
      success: resolve,
      error: reject,
    })
  })

  const get = promisify(Trello.get.bind(Trello));
  const post = promisify(Trello.post.bind(Trello));

  const boards = await get(`/members/davidbuchanswanson/boards`);
  const board = boards.find(b => b.name === BOARD_NAME);

  console.log(board);

  const lists = await get(`/boards/${board.id}/lists`);
  const list = lists.find(l => l.name === 'Weeks');

  console.log(lists);

  const start = new Date('2018-07-23T09:00:00');
  const cards = [];
  let week = 1;
  while (start < new Date('2018-09-21')) {
    cards.push({
      name: `Week ${week++}`,
      idList: list.id,
      due: start.toISOString(),
      dueComplete: start < new Date(),
    });
    start.setDate(start.getDate() + 7);
  }

  let holidays = 1;

  while (start < new Date('2018-10-01')) {
    cards.push({
      name: `Holidays ${holidays++}`,
      idList: list.id,
      due: start.toISOString()
    });
    start.setDate(start.getDate() + 7);
  }

  while (start < new Date('2018-10-26')) {
    cards.push({
      name: `Week ${week++}`,
      idList: list.id,
      due: start.toISOString()
    });
    start.setDate(start.getDate() + 7);
  }

  let exams = 1;

  start.setTime(new Date('2018-11-01'));

  while (start < new Date('2018-11-16')) {
    cards.push({
      name: `Exams ${exams++}`,
      idList: list.id,
      due: start.toISOString()
    });
    if (start.getDay() !== 1) {
      start.setDate((start.getDate() + (1 - start.getDay())))
    }
    start.setDate(start.getDate() + 7);
  }

  await cards.reduce((p, card, i) => {
    return p.then(() => post('cards', { ...card, pos: i + 1 }));
  }, Promise.resolve());

  console.log('cards created');
})(); 'test';

These aren't really designed for (re)use. The code is sloppy and definitely not as good as it could be.