Create ledger text out of Money forward (https://moneyforward.com/)

money_forward_to_ledger.js

// ==UserScript==
// @name     Moneyforward to ledger
// @version  1
// @grant    GM.setClipboard
// @require  https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js
// @match    https://moneyforward.com/accounts/show/*
// ==/UserScript==

function runReport(node) {
  var result = [];
  $('#cf-detail-table > tbody > tr').each(function(i, trnode) {
    result.push(convertTransaction(trnode));
  });
  result.reverse();
  GM.setClipboard(result.join(''));
}

class Post {
  constructor(account, amount, comment=null) {
    this.account = account;
    this.amount = amount;
    this.comment = comment;
  }
  
  print() {
    var res = '    ' + this.account + '        ' + this.amount;
    if (this.comment) {
      res += ' ; ' + this.comment;
    }
    return res;
  }
}

function convertTransaction(trnode) {
  var date;
  var code;
  var payee;
  var amount;
  var srcAccount;
  var destAccount;
  $(trnode).find('td').each(function(i, td) {
    let tdtext = $(td).text().trim();
    switch (i) {
      case 0:
        // do nothing
        break;
      case 1:
        let datetext = $(td).data('table-sortable-value');
        let match = /(\d+\/\d+\/\d+)-(\d+)/.exec(datetext);
        if (!match) {
          console.error('failed to match date: ', datetext);
        } else {
          date = match[1];
          code = match[2];
        }
        break;
      case 2:
        payee = $(td).find('div span').text().trim();
        break;
      case 3:
        amount = $(td).find('span.offset').text().trim();
        break;
      case 4:
        let srcData = $(td).data('original-title');
        if (srcData.startsWith('みずほ銀行 北沢支店 普通')) {
          srcAccount = 'Assets:Banks:Mizuho:Kitazawa';
        } else if (srcData.startsWith('みずほ銀行 兜町支店 普通')) {
          srcAccount = 'Assets:Banks:Mizuho:Kabuto';
        }
        let dstBox = $(td).find('.transfer_account_box');
        if (dstBox) {
          switch(dstBox.text().trim()) {
            case '三井住友カード':
              destAccount = 'Liabilities:ANA Card';
              break;
            case 'セゾンカード':
              destAccount = 'Liabilities:Mizuho Card';
              break;
          }
        }
        break;
      case 6:
        switch (tdtext) {
          case '生命保険':
            destAccount = 'Expenses:Insurances:Life';
            break;
          case 'その他保険':
            destAccount = 'Expenses:Insurances:Medical';
            break;
          case '学費':
            destAccount = 'Liabilities:Fixed:JASSO';
            break;
          case 'その他税・社会保障':
            destAccount = 'Expenses:Tax:Income';
            break;
        }
        break;
    }
  });
  return [
    '',
    date + ' * (' + code + ') ' + payee,
    new Post(srcAccount, amount + ' JPY').print(),
    new Post(destAccount, negateAmount(amount) + ' JPY').print(),
    '',
    ].join('\n');
}

function negateAmount(v) {
  if (v[0] == '-') {
    return v.slice(1);
  }
  return '-' + v;
}

window.addEventListener('load', init, false);

function init() {
  var r= $('<input type="button" value="new button"/>');
  $("#ttl_genyokinbreak_table").prepend(r);
	r.on('click', runReport);
};