draft torrent info page with related features #11

src/Twig/AppExtension.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Twig;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
+
+class AppExtension extends AbstractExtension
+{
+    protected $container;
+
+    public function __construct(
+        ContainerInterface $container
+    )
+    {
+        $this->container = $container;
+    }
+
+    public function getFilters()
+    {
+        return
+        [
+            new TwigFilter(
+                'format_bytes',
+                [
+                    $this,
+                    'formatBytes'
+                ]
+            ),
+        ];
+    }
+
+    public function formatBytes(
+        int $bytes,
+        int $precision = 2
+    ) : string
+    {
+        $size = [
+            'B',
+            'Kb',
+            'Mb',
+            'Gb',
+            'Tb',
+            'Pb',
+            'Eb',
+            'Zb',
+            'Yb'
+        ];
+
+        $factor = floor((strlen($bytes) - 1) / 3);
+
+        return sprintf("%.{$precision}f", $bytes / pow(1024, $factor)) . ' ' . @$size[$factor];
+    }
+}