add getData method

README.md

@@ -174,6 +174,18 @@ var_dump (
 );
 ```
 
+#### Filesystem::getData
+
+Return file content if path match storage item
+
+```
+var_dump (
+    $filesystem->getData(
+        '/full/path/to/page.txt'
+    )
+);
+```
+
 ### Helper
 
 Useful methods to minify controller codebase

src/Dokuwiki/Filesystem.php

@@ -163,6 +163,18 @@ class Filesystem
         return $path;
     }
 
+    public function getData(string $path): ?string
+    {
+        if (isset($this->_list[$path]) && is_file($path) || is_readable($path))
+        {
+            return file_get_contents(
+                $path
+            );
+        }
+
+        return null;
+    }
+
     private function _index(string $path, ?array $blacklist = ['.', '..', 'sidebar.txt', '__template.txt']): void
     {
         foreach ((array) scandir($path) as $file)