Missing register comm target (#37)

* Missing register comm target

* Linting

Co-authored-by: David Brochart <david.brochart@gmail.com>

---------

Co-authored-by: David Brochart <david.brochart@gmail.com>

Author: martinRenou

src/ypywidgets/__init__.py

@@ -8,3 +8,8 @@
     __version__ = importlib.metadata.version("ypywidgets")
 except importlib.metadata.PackageNotFoundError:  # pragma: no cover
     __version__ = "unknown"
+
+
+from .comm import register_comm_target
+
+register_comm_target()

src/ypywidgets/comm.py

@@ -15,6 +15,17 @@
 from .widget import Widget
 
 
+def handle_comm_opened(*args, **kwargs):
+    # TODO handle comm open from front-end
+    pass  # pragma: nocover
+
+
+def register_comm_target():
+    comm_manager = comm.get_comm_manager()
+    if comm_manager is not None:
+        comm_manager.register_target("ywidget", handle_comm_opened)
+
+
 def create_widget_comm(
     data: dict | None = None,
     metadata: dict | None = None,