feat: Detect new and deleted playlists; refactor command execution

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

main.py

@@ -11,6 +11,22 @@ logging.basicConfig(
         format='[%(asctime)s] %(levelname)s %(module)s/%(funcName)s - %(message)s',
         level=logging.DEBUG if DEBUG else logging.INFO)
 
+def run_pls_command(playlist_id, playlist_name):
+    """Runs the docker exec command for a given playlist."""
+    cmd = ['docker', 'exec', 'navidrome-navidrome-1', '/app/navidrome', 'pls', '-l', 'error', '-np', playlist_id]
+    try:
+        result = subprocess.run(cmd, capture_output=True, text=True, check=False)
+        print(f"\n--- Output for playlist '{playlist_name}' ---")
+        if result.stdout.strip():
+            print(result.stdout.strip())
+        if result.stderr.strip():
+            print("STDERR:")
+            print(result.stderr.strip())
+        print("--- End output ---\n")
+    except FileNotFoundError:
+        logging.error("Command 'docker' not found. Please ensure it is installed and in your PATH.")
+
+
 def main():
     """Get playlists from a Navidrome server using the Subsonic API."""
     navidrome_url = os.environ.get('NAVIDROME_URL')
@@ -42,7 +58,7 @@ def main():
         'f': 'json'
     }
 
-    playlist_song_counts = {}
+    known_playlists = {}
 
     while True:
         api_url = f"{navidrome_url.rstrip('/')}/rest/getPlaylists.view"
@@ -70,37 +86,48 @@ def main():
             continue
 
         playlists = subsonic_response.get('playlists', {}).get('playlist', [])
-        
         current_playlists = {p.get('id'): p for p in playlists}
 
-        # On the first successful poll, print the list of playlists and populate the counts
+        # On first successful poll, just populate state and print list
-        if not playlist_song_counts and playlists:
+        if not known_playlists and playlists:
             logging.info("Initial scan. Monitoring playlists for changes.")
             print(f"Playlists for {username}:")
             for playlist_id, playlist_data in current_playlists.items():
                 print(f"  - [{playlist_id}] {playlist_data.get('name')} ({playlist_data.get('songCount')} songs)")
+            known_playlists = current_playlists
+            time.sleep(5)
+            continue
 
-        # Check for song count changes in playlists we are already tracking
+        # --- Detect changes after initial scan ---
+        
+        # Newly created playlists
+        newly_added_ids = set(current_playlists.keys()) - set(known_playlists.keys())
+        for playlist_id in newly_added_ids:
+            playlist_data = current_playlists[playlist_id]
+            playlist_name = playlist_data.get('name')
+            logging.info(f"New playlist detected: '{playlist_name}' ({playlist_id}). Running command.")
+            run_pls_command(playlist_id, playlist_name)
+
+        # Deleted playlists
+        deleted_ids = set(known_playlists.keys()) - set(current_playlists.keys())
+        for playlist_id in deleted_ids:
+            playlist_data = known_playlists[playlist_id]
+            logging.info(f"Playlist deleted: '{playlist_data.get('name')}' ({playlist_id}).")
+
+        # Check for song count changes in existing playlists
         for playlist_id, playlist_data in current_playlists.items():
+            if playlist_id in known_playlists:
+                previous_data = known_playlists[playlist_id]
                 current_song_count = playlist_data.get('songCount')
-            if playlist_id in playlist_song_counts and playlist_song_counts[playlist_id] != current_song_count:
+                previous_song_count = previous_data.get('songCount')
-                logging.info(f"Song count changed for '{playlist_data.get('name')}' ({playlist_id}): {playlist_song_counts[playlist_id]} -> {current_song_count}. Running command.")
 
-                cmd = ['docker', 'exec', 'navidrome-navidrome-1', '/app/navidrome', 'pls', '-l', 'error', '-np', playlist_id]
+                if previous_song_count != current_song_count:
-                try:
+                    playlist_name = playlist_data.get('name')
-                    result = subprocess.run(cmd, capture_output=True, text=True, check=False)
+                    logging.info(f"Song count changed for '{playlist_name}' ({playlist_id}): {previous_song_count} -> {current_song_count}. Running command.")
-                    print(f"\n--- Output for playlist '{playlist_data.get('name')}' ---")
+                    run_pls_command(playlist_id, playlist_name)
-                    if result.stdout.strip():
-                        print(result.stdout.strip())
-                    if result.stderr.strip():
-                        print("STDERR:")
-                        print(result.stderr.strip())
-                    print("--- End output ---\n")
-                except FileNotFoundError:
-                    logging.error("Command 'docker' not found. Please ensure it is installed and in your PATH.")
 
-        # Update the state for the next iteration. This handles new, deleted, and updated playlists.
+        # Update the state for the next iteration.
-        playlist_song_counts = {pid: pdata.get('songCount') for pid, pdata in current_playlists.items()}
+        known_playlists = current_playlists
 
         time.sleep(5)