limit the choices in argparse to the enum values

grum/cli.py

@@ -5,6 +5,7 @@ from PyQt5.QtWidgets import QApplication
 
 from . import ctrl_c, theme
 from .mainwin import MainWindow
+from .mdi import MDIWindowMode
 
 
 def main():
@@ -26,7 +27,7 @@ def handle_clargs():
 
     parser.add_argument("-e", "--examples", dest="add_examples", action="store_true", help="Add example data")
 
-    parser.add_argument("-w", "--window-mode", default="multi", help='Set the window mode to either "single", "multi" or "tabs"')
+    parser.add_argument("-w", "--window-mode", default="multi", choices=MDIWindowMode.values(), help="Set the initial window mode")
 
     return parser.parse_args().__dict__
 

grum/mdi/mdiarea.py

@@ -8,9 +8,14 @@ from ..menus import BarMenu
 
 
 class MDIWindowMode(str, enum.Enum):
+    MULTI  = "multi"
     SINGLE = "single"
-    MULTI = "multi"
-    TABS = "tabs"
+    TABS   = "tabs"
+
+    @classmethod
+    def values(cls):
+        return tuple(i.value for i in cls)
+
 
 
 class MDIArea(QMdiArea):
@@ -37,7 +42,7 @@ class MDIArea(QMdiArea):
         menu.addAction("Close inactive", self.closeInactiveSubWindows)
 
 
-    def set_window_mode(self, mode:MDIWindowMode) -> None:
+    def set_window_mode(self, mode: MDIWindowMode) -> None:
         mode_enablers = {
             MDIWindowMode.SINGLE: self.enable_single_window_mode,
             MDIWindowMode.MULTI:  self.enable_multiple_windows_mode,