gui: pass database configuration as command-line options

brmbar3/brmbar-gui-qt4.py

@@ -9,6 +9,8 @@ from brmbar import Database
 
 import brmbar
 
+import argparse
+
 # User credit balance limit; sale will fail when balance is below this limit.
 LIMIT_BALANCE = -200
 # When below this credit balance, an alert hook script (see below) is run.
@@ -224,6 +226,23 @@ class ShopAdapter(QtCore.QObject):
         db.commit()
         return balance
 
+parser = argparse.ArgumentParser()
+parser.add_argument("--dbname", help="Database name", type=str)
+parser.add_argument("--dbuser", help="Database user", type=str)
+parser.add_argument("--dbhost", help="Database host", type=str)
+parser.add_argument("--dbpass", help="Database user password", type=str)
+args = parser.parse_args()
+argdbname = args.dbname
+argdbuser = args.dbuser
+argdbhost = args.dbhost
+argdbpass = args.dbpass
+
+db = Database.Database(
+    "dbname={0} user={1} host={2} password={3}".format(
+        argdbname,argdbuser,argdbhost,argdbpass
+    )
+)
+
 db = Database.Database("dbname=brmbar")
 shop = brmbar.Shop.new_with_defaults(db)
 currency = shop.currency