[SWDEV-513958] Fix error message due to argparse behavior (#108)

When argparse parses multiple invalid arguments, the error
message displays only the last argument and this leads to
confusion. To avoid the scenario, added valid command check
before argparse and in case of invalid first command, added
new exception.

Signed-off-by: Bindhiya Kanangot Balakrishnan <Bindhiya.KanangotBalakrishnan@amd.com>

amdsmi_cli/amdsmi_cli.py

@@ -103,9 +103,18 @@ if __name__ == "__main__":
         except NameError:
             logging.debug("argcomplete module not found. Autocomplete will not work.")
 
+        valid_commands = ['version', 'list', 'static', 'firmware', 'bad-pages',
+                          'metric', 'process', 'profile', 'event', 'topology', 'set',
+                          'reset', 'monitor', 'xgmi', 'partition', '--help']
+
         sys.argv = [arg.lower() if arg.startswith('--') or not arg.startswith('-')
                     else arg for arg in sys.argv]
-        args = amd_smi_parser.parse_args(args=None if sys.argv[1:] else ['--help'])
+        if len(sys.argv) == 1:
+            args = amd_smi_parser.parse_args(args=['--help'])
+        elif sys.argv[1] in valid_commands:
+            args = amd_smi_parser.parse_args(args=None)
+        else:
+            raise amdsmi_cli_exceptions.AmdSmiInvalidSubcommandException(sys.argv[1],amd_smi_commands.logger.destination)
 
         # Handle command modifiers before subcommand execution
         if args.json:

amdsmi_cli/amdsmi_cli_exceptions.py

@@ -241,6 +241,21 @@ class AmdSmiRequiredCommandException(AmdSmiException):
         self.stdout_message = f"{common_message} Error code: {self.value}"
 
 
+class AmdSmiInvalidSubcommandException(AmdSmiException):
+    def __init__(self, command, outputformat: str):
+        super().__init__()
+        self.value = -10
+        self.command = command
+        self.output_format = outputformat
+
+        common_message = f"AMD-SMI Command '{self.command}' is invalid. Must receive valid AMD-SMI Command first. Run '--help' for more info."
+
+        self.json_message["error"] = common_message
+        self.json_message["code"] = self.value
+        self.csv_message = f"error,code\n{common_message}, {self.value}"
+        self.stdout_message = f"{common_message} Error code: {self.value}"
+
+
 class AmdSmiUnknownErrorException(AmdSmiException):
     def __init__(self, command, outputformat: str):
         super().__init__()