Add override for new directory from the CLI

generate_gallery.py

@@ -19,7 +19,7 @@ from typing import Dict, Any, Optional
 from datetime import datetime
 from jinja2 import Environment, FileSystemLoader
 
-from utils.config import Config
+from utils.config import Config, GalleryItem
 from utils.metadata import (
     load_folder_metadata,
     merge_metadata,
@@ -120,12 +120,16 @@ def build_gallery(
     )
 
 
-def main(clean_first: bool = False) -> None:
+def main(
+    clean_first: bool = False, source_override: Optional[str] = None
+) -> None:
     """
     Main entry point for gallery generation.
 
     Args:
         clean_first: If True, removes and recreates the gallery directory
+        source_override: If provided, only process this source directory.
+                        If not in config, it will be temporarily added.
 
     Processes all configured sources and generates the complete gallery
     structure in the web directory. Ensures assets are available.
@@ -151,9 +155,34 @@ def main(clean_first: bool = False) -> None:
     else:
         print(f"Warning: Assets directory {assets_src} not found")
 
+    # Determine which sources to process
+    if source_override:
+        source_path = Path(source_override).resolve()
+
+        # Check if source is in config
+        matching_source = None
+        for source in CONFIG.sources:
+            if Path(source.path).resolve() == source_path:
+                matching_source = source
+                break
+
+        # If not in config, create a temporary source entry
+        if matching_source is None:
+            source_name = source_path.name
+            msg = (
+                f"Source {source_override} not in config. "
+                f"Adding temporarily as '{source_name}'"
+            )
+            print(msg)
+            matching_source = GalleryItem(name=source_name, path=source_path)
+
+        sources_to_process = [matching_source]
+    else:
+        sources_to_process = CONFIG.sources
+
     source_subdirs = []
 
-    for source in CONFIG.sources:
+    for source in sources_to_process:
         source_path = Path(source.path)
         source_web_dir = gallery_root / source.name
         source_web_dir.mkdir(parents=True, exist_ok=True)
@@ -203,5 +232,12 @@ if __name__ == "__main__":
         action='store_true',
         help='Clean gallery directory before generation'
     )
+    parser.add_argument(
+        '--source',
+        type=str,
+        default=None,
+        help='Override to only recompute a specific source directory. '
+             'If the directory is not in config, it will be added temporarily.'
+    )
     args = parser.parse_args()
-    main(clean_first=args.clean)
+    main(clean_first=args.clean, source_override=args.source)