feat: impl WorkspaceDescriptionChanged event

dooit/ui/widgets/trees/workspaces_tree.py

@@ -1,9 +1,16 @@
+from sqlalchemy.event import listen
+from sqlalchemy.orm.attributes import get_history
+
 from typing import TYPE_CHECKING, List, Optional
 from textual import on
 from textual.widgets.option_list import Option
 
 from dooit.api import Workspace
-from dooit.ui.events.events import WorkspaceRemoved, WorkspaceSelected
+from dooit.ui.events.events import (
+    WorkspaceDescriptionChanged,
+    WorkspaceRemoved,
+    WorkspaceSelected,
+)
 from .model_tree import ModelTree
 from .todos_tree import TodosTree
 from ._render_dict import WorkspaceRenderDict
@@ -68,3 +75,19 @@ def workspace_highlighted(self, event: ModelTree.OptionHighlighted):
 
         event.stop()
         self.post_message(WorkspaceSelected(Workspace.from_id(event.option_id)))
+
+    # Listeners
+
+    def setup_listeners(self) -> None:
+        listen(Workspace, "after_update", self._track_description_update)
+
+    def _track_description_update(self, _mapper, _connection, target: Workspace):
+        history = get_history(target, "description")
+        if history.has_changes():
+            old = history.deleted[0] if history.deleted else ""
+            new = history.added[0] if history.added else ""
+
+            if old or new:
+                self.post_message(
+                    WorkspaceDescriptionChanged(old, new, target),
+                )