Add --config option for explicitly stating configuration file to use.

aliparlakci/bulk-downloader-for-reddit#122

Address comments in pull review.

* Removed vertical space.
* Added config file existence check with log message.

script.py

@@ -256,14 +256,24 @@ def printLogo():
     )
 
 def main():
+    arguments = Arguments.parse()
+    GLOBAL.arguments = arguments
 
-    if not Path(GLOBAL.defaultConfigDirectory).is_dir():
-        os.makedirs(GLOBAL.defaultConfigDirectory)
-
-    if Path("config.json").exists():
-        GLOBAL.configDirectory = Path("config.json")
+    if arguments.config:
+        if arguments.use_local_config:
+            sys.exit()
+        if Path(arguments.config).exists():
+            GLOBAL.configDirectory = Path(arguments.config)
+        else:
+            VanillaPrint("custom config",arguments.config,"not found. Exiting.")
+            sys.exit()
     else:
-        GLOBAL.configDirectory = GLOBAL.defaultConfigDirectory  / "config.json"
+        if not Path(GLOBAL.defaultConfigDirectory).is_dir():
+            os.makedirs(GLOBAL.defaultConfigDirectory)
+        if Path("config.json").exists():
+            GLOBAL.configDirectory = Path("config.json")
+        else:
+            GLOBAL.configDirectory = GLOBAL.defaultConfigDirectory  / "config.json"
     try:
         GLOBAL.config = Config(GLOBAL.configDirectory).generate()
     except InvalidJSONFile as exception:
@@ -274,9 +284,6 @@ def main():
 
     sys.argv = sys.argv + GLOBAL.config["options"].split()
 
-    arguments = Arguments.parse()
-    GLOBAL.arguments = arguments
-
     if arguments.set_filename:
         Config(GLOBAL.configDirectory).setCustomFileName()
         sys.exit()
@@ -362,4 +369,4 @@ if __name__ == "__main__":
         print(GLOBAL.log_stream.getvalue())
 
     if not GLOBAL.arguments.quit: input("\nPress enter to quit\n")
-              
+