Made it almost to the accounts.

app/Support/Twig/General.php

@@ -0,0 +1,115 @@
+<?php
+
+namespace FireflyIII\Support\Twig;
+
+use App;
+use Config;
+use FireflyIII\Models\Account;
+use Route;
+use Twig_Extension;
+use Twig_SimpleFilter;
+use Twig_SimpleFunction;
+
+/**
+ * Class TwigSupport
+ *
+ * @package FireflyIII\Support
+ */
+class General extends Twig_Extension
+{
+
+
+    /**
+     * @return array
+     */
+    public function getFilters()
+    {
+        $filters = [];
+
+        $filters[] = new Twig_SimpleFilter(
+            'formatAmount', function ($string) {
+            return App::make('amount')->format($string);
+        }, ['is_safe' => ['html']]
+        );
+
+        $filters[] = new Twig_SimpleFilter(
+            'formatJournal', function ($journal) {
+            return App::make('amount')->formatJournal($journal);
+        }, ['is_safe' => ['html']]
+        );
+
+        $filters[] = new Twig_SimpleFilter(
+            'balance', function (Account $account = null) {
+            if (is_null($account)) {
+                return 'NULL';
+            }
+
+            return App::make('steam')->balance($account);
+        }
+        );
+
+        // should be a function but OK
+        $filters[] = new Twig_SimpleFilter(
+            'getAccountRole', function ($name) {
+            return Config::get('firefly.accountRoles.' . $name);
+        }
+        );
+
+        return $filters;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getFunctions()
+    {
+        $functions = [];
+
+        $functions[] = new Twig_SimpleFunction(
+            'getCurrencyCode', function () {
+            return App::make('amount')->getCurrencyCode();
+        }
+        );
+
+
+        $functions[] = new Twig_SimpleFunction(
+            'env', function ($name, $default) {
+            return env($name, $default);
+        }
+        );
+
+        $functions[] = new Twig_SimpleFunction(
+            'activeRoute', function ($context) {
+            $args  = func_get_args();
+            $route = $args[1];
+            $what  = isset($args[2]) ? $args[2] : false;
+            $activeWhat = isset($context['what']) ? $context['what'] : false;
+            // activeRoute
+            if (!($what === false)) {
+                if ($what == $activeWhat && Route::getCurrentRoute()->getName() == $route) {
+                    return 'active because-active-what';
+                }
+            } else {
+                if (Route::getCurrentRoute()->getName() == $route) {
+                    return 'active because-route-matches';
+                }
+            }
+
+            return 'not-xxx-at-all';
+        }, ['needs_context' => true]
+        );
+
+        return $functions;
+
+
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getName()
+    {
+        return 'FireflyIII\Support\Twig\General';
+    }
+
+}

app/Support/Twig/Journals.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace FireflyIII\Support\Twig;
+
+
+use FireflyIII\Models\TransactionJournal;
+use Twig_Extension;
+use Twig_SimpleFilter;
+use Twig_SimpleFunction;
+
+/**
+ * Class Journals
+ *
+ * @package FireflyIII\Support\Twig
+ */
+class Journals extends Twig_Extension
+{
+
+    public function getFilters()
+    {
+        $filters = [];
+
+        $filters[] = new Twig_SimpleFilter(
+            'typeIcon', function (TransactionJournal $journal) {
+            $type = $journal->transactionType->type;
+            if ($type == 'Withdrawal') {
+                return '<span class="glyphicon glyphicon-arrow-left" title="Withdrawal"></span>';
+            }
+            if ($type == 'Deposit') {
+                return '<span class="glyphicon glyphicon-arrow-right" title="Deposit"></span>';
+            }
+            if ($type == 'Transfer') {
+                return '<i class="fa fa-fw fa-exchange" title="Transfer"></i>';
+            }
+            if ($type == 'Opening balance') {
+                return '<span class="glyphicon glyphicon-ban-circle" title="Opening balance"></span>';
+            }
+
+
+        }, ['is_safe' => ['html']]
+        );
+
+        return $filters;
+    }
+
+    public function getFunctions()
+    {
+        $functions = [];
+
+        $functions[] = new Twig_SimpleFunction(
+            'invalidJournal', function (TransactionJournal $journal) {
+            if (!isset($journal->transactions[1]) || !isset($journal->transactions[0])) {
+                return true;
+            }
+
+            return false;
+        }
+        );
+
+        $functions[] = new Twig_SimpleFunction(
+            'relevantTags', function (TransactionJournal $journal) {
+            return 'TODO'.$journal->amount;
+        }
+        );
+
+        return $functions;
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'FireflyIII\Support\Twig\Journals';
+    }
+}