print full help instead of usage

README.md

@@ -41,7 +41,7 @@ chkbit will
 Run `chkbit PATH` to verify only.
 
 ```
-usage: chkbit.py [-h] [-u] [-f] [-q] [-v] PATH [PATH ...]
+usage: chkbit.py [-h] [-u] [-f] [-i] [-q] [-v] [PATH [PATH ...]]
 
 Checks files for bitrot. See https://github.com/laktak/chkbit-py
 
@@ -49,11 +49,12 @@ positional arguments:
   PATH
 
 optional arguments:
-  -h, --help     show this help message and exit
-  -u, --update   update indices (without this chkbit will only verify files)
-  -f, --force    force update of damaged items
-  -q, --quiet    quiet, don't show progress/information
-  -v, --verbose  verbose output
+  -h, --help          show this help message and exit
+  -u, --update        update indices (without this chkbit will only verify files)
+  -f, --force         force update of damaged items
+  -i, --verify-index  verify files in the index only (will not report new files)
+  -q, --quiet         quiet, don't show progress/information
+  -v, --verbose       verbose output
 
 Status codes:
   ROT: error, bitrot detected

chkbit/main.py

@@ -51,7 +51,7 @@ class Main:
             epilog=STATUS_CODES,
             formatter_class=argparse.RawDescriptionHelpFormatter,
         )
-        parser.add_argument("PATH", nargs="+")
+        parser.add_argument("PATH", nargs="*")
 
         parser.add_argument(
             "-u",
@@ -88,6 +88,8 @@ class Main:
         self.args = parser.parse_args()
         self.verbose = self.args.verbose
         self.quiet = self.args.quiet
+        if not self.args.PATH:
+            parser.print_help()
 
     def _res_worker(self):
         while True:
@@ -144,8 +146,9 @@ class Main:
 def main():
     try:
         m = Main()
-        m.process()
-        m.print_result()
+        if m.args.PATH:
+            m.process()
+            m.print_result()
     except KeyboardInterrupt:
         print("abort")
         sys.exit(1)

setup.py

@@ -11,7 +11,7 @@ with open(os.path.join(os.path.dirname(__file__), "README.md"), encoding="utf-8"
 
 setup(
     name="chkbit",
-    version="2.0.2",
+    version="2.0.3",
     url="https://github.com/laktak/chkbit-py",
     author="Christian Zangl",
     author_email="laktak@cdak.net",