Add -c argument, don't init config if -c ''

qutebrowser/app.py

@@ -29,7 +29,13 @@ class QuteBrowser(QApplication):
         self.initlog()
 
         self.dirs = AppDirs('qutebrowser')
-        self.config = Config(self.dirs.user_data_dir)
+        if self.args.confdir is None:
+            confdir = self.dirs.user_data_dir
+        elif self.args.confdir == '':
+            confdir = None
+        else:
+            confdir = self.args.confdir
+        self.config = Config(confdir)
 
         self.mainwindow = MainWindow()
         self.commandparser = cmdutils.CommandParser()
@@ -77,6 +83,8 @@ class QuteBrowser(QApplication):
         parser = ArgumentParser("usage: %(prog)s [options]")
         parser.add_argument('-l', '--log', dest='loglevel',
                             help='Set loglevel', default='info')
+        parser.add_argument('-c', '--confdir', help='Set config directory '
+                            '(empty for no config storage)')
         self.args = parser.parse_args()
 
     def initlog(self):

qutebrowser/utils/config.py

@@ -34,6 +34,9 @@ class Config(ConfigParser):
         super().__init__()
         self.optionxform = lambda opt: opt # be case-insensitive
         self.configdir = configdir
+        if self.configdir is None:
+            self.init_config()
+            return
         self.configfile = os.path.join(self.configdir, self.FNAME)
         if not os.path.isfile(self.configfile):
             self.init_config()
@@ -42,15 +45,19 @@ class Config(ConfigParser):
 
     def init_config(self):
         logging.info("Initializing default config.")
-        if not os.path.exists(self.configdir):
-            os.makedirs(self.configdir, 0o755)
         cp = ConfigParser()
         cp.optionxform = lambda opt: opt # be case-insensitive
         cp.read_dict(default_config)
+        if self.configdir is None:
+            return
+        if not os.path.exists(self.configdir):
+            os.makedirs(self.configdir, 0o755)
         with open(self.configfile, 'w') as f:
             cp.write(f)
 
     def save(self):
+        if self.configdir is None:
+            return
         if not os.path.exists(self.configdir):
             os.makedirs(self.configdir, 0o755)
         logging.debug("Saving config to {}".format(self.configfile))