Convert CLI parsing from DIY to argparse

BackupRotator.py

@@ -29,10 +29,13 @@ class BackupRotator:
 		self.__config_paths = []
 		self.__calculated_actions = []
 	
-	def run(self):
+	def run(self, configs, dry_run: bool = False):
 		
 		self.log("Begin")
-		self.consume_arguments()
+		
+		self.__dry_run = dry_run
+		self.__config_paths = configs
+		
 		self.consume_configs(self.__config_paths)
 		
 		# Rotate once per config
@@ -64,36 +67,10 @@ class BackupRotator:
 		
 		print(to_log)
 	
-	def consume_arguments(self):
-		
-		self.__config_paths = []
-		
-		for i in range(1, len(sys.argv)):
-			
-			arg = sys.argv[i]
-			
-			if arg == "--config":
-				i, one_path = self.consume_argument_companion(i)
-				self.__config_paths.append(one_path)
-				self.log("Found config path argument:", one_path)
-			
-			elif arg == "--dry-run":
-				self.__dry_run = True
-				self.log("Activating global dry-run mode")
-	
-	@staticmethod
-	def consume_argument_companion(arg_index):
-	
-		companion_index = arg_index + 1
-		if companion_index >= len(sys.argv):
-			raise Exception("Expected argument after", sys.argv[arg_index])
-		
-		return companion_index, sys.argv[companion_index]
-	
 	def consume_configs(self, paths: list=None):
 		
-		if paths is None:
+		assert paths is not None, "Config paths cannot be None"
-			raise Exception("Auto-finding of config file not implemented")
+		assert len(paths) > 0, "Must provide at least one config file path"
 		
 		# Use each config path
 		for path in paths:

main.py

@@ -3,13 +3,41 @@
 
 from BackupRotator import BackupRotator
 
+import argparse
+
 
 #
 def main():
 	
+	parser = argparse.ArgumentParser(
+		description="Mike's Backup Rotator. Helps automatically remove old backup files or folders."
+	)
+	
+	parser.add_argument(
+		"--config", "-c",
+		dest="config_files",
+		default=[],
+		action="append",
+		type=str,
+		help="Specify a configuration file. Can be called multiple times."
+	)
+	parser.add_argument(
+		"--dry-run", "-d",
+		dest="dry_run",
+		default=False,
+		action="store_true",
+		help="Only perform an analysis; Don't delete anything."
+	)
+	
+	args = parser.parse_args()
+	
 	rotator = BackupRotator()
-	rotator.run()
+	rotator.run(
+		configs=args.config_files,
+		dry_run=args.dry_run
+	)
 	
 
 if __name__ == "__main__":
 	main()
+