Display a message when starting and finishing XCSoar

src/ovshell/protocol/__init__.py

@@ -182,13 +182,21 @@ class Dialog(Protocol):
     def add_button(self, label: str, handler: Callable[[], bool]) -> None:
         pass
 
+    @abstractmethod
+    def no_buttons(self) -> None:
+        pass
+
 
 class IndicatorLocation(enum.Enum):
     LEFT = "left"
     RIGHT = "right"
 
 
 class ScreenManager(Protocol):
+    @abstractmethod
+    def draw(self) -> None:
+        pass
+
     @abstractmethod
     def push_activity(
         self, activity: Activity, palette: Optional[List[Tuple]] = None

src/ovshell/screen.py

@@ -115,6 +115,9 @@ def _create_layout(self) -> urwid.Widget:
             footer=urwid.AttrMap(self._footer, "bg"),
         )
 
+    def draw(self) -> None:
+        self._mainloop.draw_screen()
+
     def push_activity(self, activity: Activity, palette: List[Tuple] = None) -> None:
         self._hide_shown_activity()
 
@@ -303,6 +306,9 @@ def add_button(self, label: str, handler: Callable[[], bool]) -> None:
         self.buttons.contents = contents
         self.custom_buttons = True
 
+    def no_buttons(self) -> None:
+        self.buttons.contents = []
+
     def _on_button_clicked(
         self, handler: Callable[[], bool], btn: urwid.Widget
     ) -> None:

src/ovshell/testing.py

@@ -64,6 +64,9 @@ def __init__(self, title: str, content: urwid.Widget):
     def add_button(self, label: str, handler: Callable[[], bool]) -> None:
         self.buttons[label] = handler
 
+    def no_buttons(self) -> None:
+        self.buttons = {}
+
     def stub_press_button(self, label: str):
         return self.buttons[label]()
 
@@ -90,6 +93,9 @@ def __init__(self, log: List[str]) -> None:
         self._dialog = None
         self._indicators = {}
 
+    def draw(self) -> None:
+        self._log.append("Screen redrawn")
+
     def push_activity(
         self, activity: protocol.Activity, palette: Optional[List[Tuple]] = None
     ) -> None:

src/ovshell_xcsoar/ext.py

@@ -44,8 +44,16 @@ def launch(self) -> None:
             align="center", width=("relative", 90), valign="middle", height="pack",
         )
         try:
-            completed = subprocess.run(cmdline, capture_output=True, env=env)
-            self.shell.os.sync()
+            message = urwid.Text("Running XCSoar...")
+            self.shell.screen.push_dialog("XCSoar", message).no_buttons()
+            self.shell.screen.draw()
+            try:
+                completed = subprocess.run(cmdline, capture_output=True, env=env)
+            finally:
+                message.set_text("Finishing XCSoar...")
+                self.shell.screen.draw()
+                self.shell.os.sync()
+                self.shell.screen.pop_activity()
         except FileNotFoundError as e:
             self.shell.screen.push_modal(
                 AppOutputActivity(self.shell, str(e)), modal_opts