Ticket #32052: 04222015-1020_mo_caching.diff

src/wp-includes/pomo/mo.php

@@ -19 +19 @@
          * Fills up with the entries from MO file $filename
          *
          * @param string $filename MO file to load
+         * @return boolean
          */
         function import_from_file($filename) {
-                $reader = new POMO_FileReader($filename);
-                if (!$reader->is_resource())
-                        return false;
-                return $this->import_from_reader($reader);
+                $data = wp_cache_get($filename, 'translation.mo');
+                $mtime = filemtime($filename);
+
+                if ($mtime > $data['mtime'] || !$data) {
+                        $reader = new POMO_FileReader($filename);
+                        if (!$reader->is_resource())
+                                return false;
+                        $result = $this->import_from_reader($reader);
+
+                        if ($result) {
+                                wp_cache_set($filename, array(
+                                        'mtime' => $mtime,
+                                        'entries' => $this->entries,
+                                        'headers' => $this->headers), 'translation.mo');
+                        }
+
+                        return $result;
+                } else {
+                        $this->entries = $data['entries'];
+                        $this->headers = $data['headers'];
+
+                        return true;
+                }
         }
 
         function export_to_file($filename) {