Scan for new files every startup

src/main.rs

@@ -174,15 +174,6 @@ async fn create_thumbnails() {
     let thumbs = &dotenv::var("THUMBNAILS").expect("THUMBNAILS not defined");
     let thumbnail_directory: &Path = Path::new(thumbs);
 
-    let t: Vec<_> = thumbnail_directory
-        .read_dir()
-        .expect("Error reading thumbnail directory")
-        .collect();
-    if !t.is_empty() {
-        println!("Skipping thumbs");
-        return;
-    }
-
     let images = PathBuf::from(dotenv::var("BASE_PATH").unwrap());
 
     walkdir::WalkDir::new(&images)
@@ -211,6 +202,12 @@ async fn create_thumbnails() {
                 false
             }
         })
+        .filter(|entry| {
+            let path = entry.path();
+            let relative_path = &path.strip_prefix(&images).unwrap();
+            let thumb_path = Path::new(thumbnail_directory).join(relative_path);
+            return !thumb_path.exists();
+        })
         .map(|entry| (image::open(entry.path()), entry.path().to_path_buf()))
         .filter(|(img, _)| img.is_ok())
         .map(|(img, path)| (img.unwrap(), path))