Allow specifying config file

monitor.py

@@ -53,8 +53,10 @@ class Line:
 last_reply = None
 parser = argparse.ArgumentParser()
 parser.add_argument("-s", "--setup", help="Run the setup routine.", action="store_true", dest="setup")
+parser.add_argument('-c', '--config', help='A configuration file', action='store', default='vrr.ini', dest='config')
 
 args = parser.parse_args()
+
 if args.setup:
     import setup
     setup.setup()
@@ -64,7 +66,7 @@ if args.setup:
 
 cfg = configparser.ConfigParser()
 try:
-    with open('vrr.ini') as f:
+    with open(args.config) as f:
         cfg.read_file(f)
 except IOError:
     sys.exit("Could not open the configuration file.")
@@ -94,7 +96,7 @@ try:
     if cfg['crawl']['station_id'] is not None:
         USE_STATION_ID = cfg['crawl'].getint('station_id')
     else:
-        sys.exit("Please specify a station_id in the [crawl] section of vrr.ini")
+        sys.exit(f"Please specify a station_id in the [crawl] section of {args.config}")
     USE_LINES = cfg['crawl']['use_lines'].split(',')
 except (IndexError, configparser.NoOptionError, configparser.NoSectionError):
     sys.exit("There is something wrong with the configuration file. Exiting.")