firefly-iii/app/Support/Twig/Journal.php

<?php
declare(strict_types = 1);

namespace FireflyIII\Support\Twig;


use FireflyIII\Models\TransactionJournal;
use Twig_Extension;
use Twig_SimpleFilter;
use Twig_SimpleFunction;

/**
 * Class Journal
 *
 * @package FireflyIII\Support\Twig
 */
class Journal extends Twig_Extension
{

    /**
     * @return array
     */
    public function getFilters(): array
    {
        $filters = [$this->typeIcon()];

        return $filters;
    }

    /**
     * @return array
     */
    public function getFunctions(): array
    {
        $functions = [
            $this->invalidJournal(),
        ];

        return $functions;
    }

    /**
     * Returns the name of the extension.
     *
     * @return string The extension name
     */
    public function getName(): string
    {
        return 'FireflyIII\Support\Twig\Journals';
    }

    /**
     * @return Twig_SimpleFunction
     */
    protected function invalidJournal(): Twig_SimpleFunction
    {
        return new Twig_SimpleFunction(
            'invalidJournal', function (TransactionJournal $journal): bool {
            if (!isset($journal->transactions[1]) || !isset($journal->transactions[0])) {
                return true;
            }

            return false;
        }
        );
    }

    /**
     * @return Twig_SimpleFilter
     */
    protected function typeIcon(): Twig_SimpleFilter
    {
        return new Twig_SimpleFilter(
            'typeIcon', function (TransactionJournal $journal): string {

            switch (true) {
                case $journal->isWithdrawal():
                    $txt = '<i class="fa fa-long-arrow-left fa-fw" title="' . trans('firefly.withdrawal') . '"></i>';
                    break;
                case $journal->isDeposit():
                    $txt = '<i class="fa fa-long-arrow-right fa-fw" title="' . trans('firefly.deposit') . '"></i>';
                    break;
                case $journal->isTransfer():
                    $txt = '<i class="fa fa-fw fa-exchange" title="' . trans('firefly.transfer') . '"></i>';
                    break;
                case $journal->isOpeningBalance():
                    $txt = '<i class="fa-fw fa fa-ban" title="' . trans('firefly.openingBalance') . '"></i>';
                    break;
                default:
                    $txt = '';
                    break;
            }

            return $txt;
        }, ['is_safe' => ['html']]
        );
    }
}