refactor: drop _Dispatcher

Update the minimum version of craft-cli to 2.3.0, in which the standard
Dispatcher class has the ``parsed_args()`` method which we can use
instead.

craft_application/application.py

@@ -16,7 +16,6 @@
 """Main application classes for a craft-application."""
 from __future__ import annotations
 
-import argparse
 import functools
 import importlib
 import os
@@ -44,15 +43,6 @@
 )
 
 
-class _Dispatcher(craft_cli.Dispatcher):
-    """Application command dispatcher."""
-
-    @property
-    def parsed_args(self) -> argparse.Namespace:
-        """The map of parsed command-line arguments."""
-        return self._parsed_command_args or argparse.Namespace()
-
-
 @dataclass(frozen=True)
 class AppFeatures:
     """Specific features that can be enabled/disabled per-application."""
@@ -247,7 +237,7 @@ def run_managed(self, platform: str | None, build_for: str | None) -> None:
     def configure(self, global_args: dict[str, Any]) -> None:
         """Configure the application using any global arguments."""
 
-    def _get_dispatcher(self) -> _Dispatcher:
+    def _get_dispatcher(self) -> craft_cli.Dispatcher:
         """Configure this application. Should be called by the run method.
 
         Side-effect: This method may exit the process.
@@ -262,7 +252,7 @@ def _get_dispatcher(self) -> _Dispatcher:
             streaming_brief=True,
         )
 
-        dispatcher = _Dispatcher(
+        dispatcher = craft_cli.Dispatcher(
             self.app.name,
             self.command_groups,
             summary=str(self.app.summary),
@@ -327,11 +317,11 @@ def run(self) -> int:  # noqa: PLR0912 (too many branches due to error handling)
                     }
                 ),
             )
-            platform = getattr(dispatcher.parsed_args, "platform", None)
-            build_for = getattr(dispatcher.parsed_args, "build_for", None)
+            platform = getattr(dispatcher.parsed_args(), "platform", None)
+            build_for = getattr(dispatcher.parsed_args(), "build_for", None)
             self._configure_services(platform, build_for)
 
-            if not command.run_managed(dispatcher.parsed_args):
+            if not command.run_managed(dispatcher.parsed_args()):
                 # command runs in the outer instance
                 craft_cli.emit.debug(f"Running {self.app.name} {command.name} on host")
                 if command.always_load_project:

pyproject.toml

@@ -3,7 +3,7 @@ name = "craft-application"
 description = "A framework for *craft applications."
 dynamic = ["version", "readme"]
 dependencies = [
-    "craft-cli>=2.0.0",
+    "craft-cli>=2.3.0",
     "craft-parts>=1.21.1",
     "craft-providers>=1.14.0,<2.0",
     "pydantic>=1.10,<2.0",

tests/unit/test_application.py

@@ -80,10 +80,8 @@ def app(app_metadata, fake_services):
 
 @pytest.fixture()
 def mock_dispatcher(monkeypatch):
-    dispatcher = mock.Mock(spec_set=application._Dispatcher)
-    monkeypatch.setattr(
-        "craft_application.application._Dispatcher", mock.Mock(return_value=dispatcher)
-    )
+    dispatcher = mock.Mock(spec_set=craft_cli.Dispatcher)
+    monkeypatch.setattr("craft_cli.Dispatcher", mock.Mock(return_value=dispatcher))
     return dispatcher