Process Qt args via argparse

qutebrowser/app.py

@@ -94,7 +94,7 @@ class Application(QApplication):
         Args:
             Argument namespace from argparse.
         """
-        super().__init__(sys.argv)
+        super().__init__(self._get_qt_args(args))
         self._quit_status = {
             'crash': True,
             'tabs': False,
@@ -146,6 +146,35 @@ class Application(QApplication):
         if self._crashdlg is not None:
             self._crashdlg.raise_()
 
+    def _get_qt_args(self, namespace):
+        """Get the Qt QApplication arguments based on an argparse namespace.
+
+        Args:
+            namespace: The argparse namespace.
+
+        Return:
+            The argv list to be passed to Qt.
+        """
+        argv = [sys.argv[0]]
+        qt_args = ['style', 'stylesheet', 'widget-count', 'reverse',
+                   'qmljsdebugger']
+        for argname in qt_args:
+            try:
+                val = getattr(namespace, 'qt_' + argname)
+            except AttributeError:
+                pass
+            else:
+                if val is True:
+                    argv.append('-' + argname)
+                elif val in [False, None]:
+                    # flag/argument not given
+                    pass
+                else:
+                    argv.append('-' + argname)
+                    argv.append(val)
+        log.init.debug("Qt arguments: {}, based on {}".format(argv, namespace))
+        return argv
+
     def _init_config(self):
         """Inizialize and read the config."""
         if self._args.confdir is None:

qutebrowser/qutebrowser.py

@@ -49,6 +49,20 @@ def _parse_args():
     debug.add_argument('--harfbuzz', choices=['old', 'new', 'system', 'auto'],
                         default='auto', help="HarfBuzz engine version to use. "
                         "Default: auto.")
+    debug.add_argument('--qt-style', help="Set the Qt GUI style to use.",
+                       metavar='STYLE')
+    debug.add_argument('--qt-stylesheet', help="Override the Qt application "
+                       "stylesheet.", metavar='STYLESHEET')
+    debug.add_argument('--qt-widget-count', help="Print debug message at the "
+                       "end about number of widgets left undestroyed and "
+                       "maximum number of widgets existed at the same time.",
+                       action='store_true')
+    debug.add_argument('--qt-reverse', help="Set the application's layout "
+                       "direction to right-to-left.", action='store_true')
+    debug.add_argument('--qt-qmljsdebugger', help="Activate the QML/JS "
+                       "debugger with a specified port. 'block' is optional "
+                       "and will make the application wait until a debugger "
+                       "connects to it.", metavar='port:PORT[,block]')
     parser.add_argument('command', nargs='*', help="Commands to execute on "
                         "startup.", metavar=':command')
     # URLs will actually be in command