Fix minor issues

Author: Merricx

src/zkregex_fuzzer/cli.py

@@ -49,7 +49,7 @@ def fuzz_parser():
     parser.add_argument(
         "--save",
         choices=[status.name for status in HarnessStatus],
-        nargs="*",
+        nargs="+",
         help="Save reproducible files according to the specified Harness status",
     )
     parser.add_argument(
@@ -209,7 +209,7 @@ def main():
     subparser = parser.add_subparsers(dest="subcommand")
     subparser.add_parser(
         "fuzz",
-        help="Generate fuzzed regexes using The Fuzzing Book's GrammarFuzzer.", 
+        help="Fuzz the target regex implementation.", 
         parents=[fuzz_parser()]
     )
     subparser.add_parser(

src/zkregex_fuzzer/runner/base_runner.py

@@ -50,15 +50,17 @@ def match(self, input: str) -> tuple[bool, str]:
         """
         pass
 
+    @abstractmethod
     def clean(self) -> None:
         """
         Clean any produced temporary files.
         """
         pass
 
+    @abstractmethod
     def save(self, path: str) -> str:
         """
         Save any produced temporary files.
         """
-        return ""
+        pass
 

src/zkregex_fuzzer/runner/python.py

@@ -34,4 +34,10 @@ def match(self, input: str) -> tuple[bool, str]:
             str_result = match_input[0] if match_success else ""
             return (match_success, str_result)
         except re.error as e:
-            raise RegexRunError(f"Error matching regex: {e}")
+            raise RegexRunError(f"Error matching regex: {e}")
+        
+    def save(self, path: str) -> str:
+        return super().save(path)
+    
+    def clean(self) -> None:
+        return super().clean()