Minor updates

src/vetr_summarizer/__main__.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from argparse import ArgumentParser
+from argparse import ArgumentDefaultsHelpFormatter, ArgumentParser
 from pathlib import Path
 
 from vetr_summarizer.html_generator import generate_html
@@ -10,10 +10,12 @@
 def main():
     parser = ArgumentParser(
         prog="vetr-summarizer",
-        description="Process and summarize aci-vetr-data JSON files into HTML reports.",
+        formatter_class=ArgumentDefaultsHelpFormatter,
+        description="Process and summarize aci-vetr-data JSON files into pretty HTML reports.",
         epilog="Thanks for using %(prog)s! :)",
         add_help=True,
         allow_abbrev=True,
+        exit_on_error=True,
         conflict_handler="error",
     )
     parser.add_argument(
@@ -22,16 +24,24 @@ def main():
         help="A path to the directory containing the JSON files.",
     )
     parser.add_argument(
-        "-f", "--format", choices=["html"], default="html", help="Output format (html)."
+        "-f",
+        "--format",
+        choices=["html"],
+        required=False,
+        default="html",
+        help="Output format",
     )
     parser.add_argument(
         "-x",
         "--exclude-file",
         type=Path,
+        required=False,
         default=Path(__file__).parent / "config/excluded_keys",
         help="File containing keys to exclude from the summary report.",
     )
-    parser.add_argument("-v", "--version", action="version", version=__version__)
+    parser.add_argument(
+        "-v", "--version", action="version", version=f"%(prog)s version {__version__}"
+    )
     args = parser.parse_args()
 
     output_file = generate_html(args.directory, args.exclude_file)

src/vetr_summarizer/html_generator.py

@@ -10,6 +10,12 @@ def load_excluded_keys(file_path: Path) -> set:
         print(f"WARNING: {file_path} does not exist! No keys will be excluded.")
         return set()
 
+    if file_path.exists() and not file_path.read_text().splitlines():
+        print(
+            f"WARNING: {file_path} does exists but without keys! No keys will be excluded."
+        )
+        return set()
+
     return {
         key.strip()
         for key in Path(file_path).read_text().splitlines()