Remove some often used long calls with shorter ones.

app/lib/FireflyIII/Shared/Toolkit/Steam.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace FireflyIII\Shared\Toolkit;
+use Carbon\Carbon;
+
+/**
+ *
+ * Steam is a special class used for those small often occurring things you need your application to do.
+ *
+ * Class Steam
+ *
+ * @package FireflyIII\Shared\Toolkit
+ */
+class Steam
+{
+
+    /**
+     * @param \Account $account
+     * @param Carbon   $date
+     *
+     * @return float
+     */
+    public function balance(\Account $account, Carbon $date = null)
+    {
+        $date = is_null($date) ? Carbon::now() : $date;
+
+        return floatval(
+            $account->transactions()->leftJoin(
+                'transaction_journals', 'transaction_journals.id', '=', 'transactions.transaction_journal_id'
+            )->where('transaction_journals.date', '<=', $date->format('Y-m-d'))->sum('transactions.amount')
+        );
+    }
+
+}