Convert helper function, fix namespace, psr2 style

.styleci.yml

@@ -0,0 +1 @@
+preset: psr2

composer.json

@@ -17,7 +17,8 @@
     "autoload": {
         "psr-4": {
             "Jens\\ImageConverter\\": "src/"
-        }
+        },
+        "files": ["src/helper.php"]
     },
     "autoload-dev": {
         "psr-4": {

src/ImageConverter.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace ImageConverter;
+namespace Jens\ImageConverter;
 
 class ImageConverter
 {
@@ -86,8 +86,8 @@ private function saveImage($to, $image, $quality)
         }
 
 
-        if(isset($quality) && !is_int($quality)) {
-          throw new \InvalidArgumentException(sprintf('The %s quality has to be an integer', $quality));
+        if (isset($quality) && !is_int($quality)) {
+            throw new \InvalidArgumentException(sprintf('The %s quality has to be an integer', $quality));
         }
 
         switch ($extension) {
@@ -100,7 +100,7 @@ private function saveImage($to, $image, $quality)
                   throw new \InvalidArgumentException(sprintf('The %s quality is out of range', $quality));
               }
               $image = imagejpeg($image, $to, $quality);
-              break;          
+              break;
           case 'png':
               if ($quality < -1 && $quality > 9) {
                   throw new \InvalidArgumentException(sprintf('The %s quality is out of range', $quality));
@@ -169,17 +169,3 @@ private function makeDirectory($to)
         return $result;
     }
 }
-
-/**
- * Helper function
- *
- * @param string $from
- * @param string $to
- *
- * @return resource
- * @throws \InvalidArgumentException
- */
-function convert($from, $to, $quality = null) {
-  $converter = new ImageConverter();
-  return $converter->convert($from, $to, $quality);
-}

src/helper.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace ImageConverter;
+
+/**
+ * Helper function
+ *
+ * @param string $from
+ * @param string $to
+ *
+ * @return resource
+ * @throws \InvalidArgumentException
+ */
+function convert($from, $to, $quality = null)
+{
+    $converter = new ImageConverter();
+    return $converter->convert($from, $to, $quality);
+}