Validate PDF parser CLI option

Author: rejojer

run_pageindex.py

@@ -29,7 +29,8 @@
     parser.add_argument('--if-add-node-text', type=str, default=None,
                       help='Whether to add text to the node')
     parser.add_argument('--pdf-parser', type=str, default=None,
-                      help='PDF text extractor: PyPDF2 (default), pypdfium2 (requires `pip install pypdfium2`), or PyMuPDF')
+                      choices=pageindex_utils.SUPPORTED_PDF_PARSERS,
+                      help='PDF text extractor to use')
 
     # Markdown specific arguments
     parser.add_argument('--if-thinning', type=str, default='no',
@@ -136,4 +137,4 @@
         with open(output_file, 'w', encoding='utf-8') as f:
             json.dump(toc_with_page_number, f, indent=2, ensure_ascii=False)
 
-        print(f'Tree structure saved to: {output_file}')
+        print(f'Tree structure saved to: {output_file}')