From b58b4b0e430c46f4776426a5acb33e9d98929300 Mon Sep 17 00:00:00 2001
From: Oliver Vogel <oliver@olivervogel.com>
Date: Sat, 23 Dec 2023 10:28:49 +0100
Subject: [PATCH] Add more detailed exception messages for NotWritableException

---
 src/File.php | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/File.php b/src/File.php
index 892865ce..964d6cee 100644
--- a/src/File.php
+++ b/src/File.php
@@ -28,6 +28,21 @@ class File implements FileInterface
      */
     public function save(string $filepath): void
     {
+        $dir = pathinfo($filepath, PATHINFO_DIRNAME);
+
+        if (!is_dir($dir)) {
+            throw new NotWritableException(
+                "Can't write image to path. Directory does not exist."
+            );
+        }
+
+        if (!is_writable($dir)) {
+            throw new NotWritableException(
+                "Can't write image to path. Directory is not writable."
+            );
+        }
+
+        // write date
         $saved = @file_put_contents($filepath, (string) $this);
         if ($saved === false) {
             throw new NotWritableException(