add preview backend for text based files

diff --git a/lib/preview/txt.php b/lib/preview/txt.php
new file mode 100644 (file)
index 0000000..2b5d8ed
--- /dev/null
+++ b/lib/preview/txt.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * Copyright (c) 2013 Georg Ehrke georg@ownCloud.com
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+class OC_Preview_TXT extends OC_Preview_Provider{
+
+       public function getMimeType(){
+               return '/text\/.*/';
+       }
+
+       public function getThumbnail($path,$maxX,$maxY,$scalingup,$fileview) {
+               $content = $fileview->fopen($path, 'r');
+               $content = stream_get_contents($content);
+
+               $lines = preg_split("/\r\n|\n|\r/", $content);
+               $numoflines = count($lines);
+
+               $fontsize = 5; //5px
+               $linesize = ceil($fontsize * 1.25);
+
+               $image = imagecreate($maxX, $maxY);
+               $imagecolor = imagecolorallocate($image, 255, 255, 255);
+               $textcolor = imagecolorallocate($image, 0, 0, 0);
+
+               foreach($lines as $index => $line){
+                       $index = $index + 1;
+
+                       $x = (int) 1;
+                       $y = (int) ($index * $linesize) - $fontsize;
+
+                       imagestring($image, 1, $x, $y, $line, $textcolor);
+
+                       if(($index * $linesize) >= $maxY){
+                               break;
+                       }
+               }
+
+               $image = new \OC_Image($image);
+               
+               if (!$image->valid()) return false;
+
+               return $image;
+       }
+}
+
+OC_Preview::registerProvider('OC_Preview_TXT');
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