New importers.

app/Import/Converter/CurrencyCode.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * CurrencyCode.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+declare(strict_types = 1);
+
+namespace FireflyIII\Import\Converter;
+
+use FireflyIII\Models\TransactionCurrency;
+use FireflyIII\Repositories\Currency\CurrencyRepositoryInterface;
+use Log;
+
+/**
+ * Class CurrencyCode
+ *
+ * @package FireflyIII\Import\Converter
+ */
+class CurrencyCode extends BasicConverter implements ConverterInterface
+{
+
+    /**
+     * @param $value
+     *
+     * @return TransactionCurrency
+     */
+    public function convert($value): TransactionCurrency
+    {
+        Log::debug('Going to convert ', ['value' => $value]);
+
+        /** @var CurrencyRepositoryInterface $repository */
+        $repository = app(CurrencyRepositoryInterface::class);
+
+        if (isset($this->mapping[$value])) {
+            Log::debug('Found currency in mapping. Should exist.', ['value' => $value, 'map' => $this->mapping[$value]]);
+            $currency = $repository->find(intval($this->mapping[$value]));
+            if (!is_null($currency->id)) {
+                Log::debug('Found currency by ID', ['id' => $currency->id]);
+
+                return $currency;
+            }
+        }
+
+        // not mapped? Still try to find it first:
+        $currency = $repository->findByCode($value);
+        if (!is_null($currency->id)) {
+            Log::debug('Found currency by code', ['id' => $currency->id]);
+
+            return $currency;
+        }
+        $currency = $repository->store(
+            [
+                'name'   => $value,
+                'code'   => $value,
+                'symbol' => $value,
+            ]
+        );
+
+        return $currency;
+    }
+}