load local playlist.

cache plex tracks.

app/utils/local_playlist.py

@@ -0,0 +1,34 @@
+from typing import List
+from app.utils.logger import logger
+
+def load_local_playlist(playlist_path: str) -> List[str]:
+    """
+    Load a local playlist from a m3u or m3u8 file.
+    Skip # comments and empty lines.
+
+    Args:
+        playlist_path (str): The path to the playlist file.
+
+    Returns:
+        list: A list of songs in the playlist.
+    """
+    try:
+        result = []
+        with open(playlist_path, 'r', encoding="utf-8") as file:
+            for line in file:
+                line = line.strip()
+                if not line:
+                    # Skip empty lines
+                    continue
+                if line.startswith('#'):
+                    # Skip comments
+                    continue
+                result.append(line)
+        logger.info(f"Loaded {len(result)} songs from the playlist: {playlist_path}")
+        return result
+    except FileNotFoundError:
+        logger.error(f"Error: The file {playlist_path} does not exist.")
+        return []
+    except Exception as e:
+        logger.error(f"An error occurred while loading the playlist: {e}")
+        return []