Add an CML option to clear the application cache (#160)

Author: pshriwise

README.md

@@ -59,6 +59,19 @@ can be used to generate images from the command line without opening the plotter
 ```console
 $ openmc-plotter -b view1.pltvw view1.pltvw view1.pltvw
 ```
+## Troubleshooting
+
+Updates to the plotter can result in stale references to deprecated features. For example, it's possible that something like the following may appear after an update:
+
+```
+AttributeError: 'MainWindow' object has no attribute 'shortcutOverlay'
+```
+
+To address this, the application settings can be cleared, the plotter can be started with the `--clear-config` (or `-c`) to reset the application's settings cache on startup.
+
+```bash
+$ openmc-plotter --clear-cache
+```
 
 ## Features
 

openmc_plotter/__main__.py

@@ -28,6 +28,8 @@ def main():
                     'XML files (default is current dir)')
     ap.add_argument('-b', '--batch-mode', nargs='+', default=False,
                     help='View files used to generate plots in batch mode')
+    ap.add_argument('-c', '--clear-config', action='store_true', default=False,
+                    help='Clear the Qt application configuration settings')
 
     args = ap.parse_args()
 
@@ -45,6 +47,10 @@ def run_app(user_args):
     app.setWindowIcon(QtGui.QIcon(path_icon))
     app.setAttribute(QtCore.Qt.AA_DontShowIconsInMenus, True)
 
+    if user_args.clear_config:
+        settings = QtCore.QSettings()
+        settings.clear()
+
     splash_pix = QtGui.QPixmap(path_splash)
     splash = QSplashScreen(splash_pix, QtCore.Qt.WindowStaysOnTopHint)
     splash.setMask(splash_pix.mask())