Add new node: check whether the input is connected

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "basic_data_handling"
-version = "1.1.1"
+version = "1.2.0"
 description = """Basic Python functions for manipulating data that every programmer is used to, lightweight with no additional dependencies.
 
 Supported data types:

src/basic_data_handling/control_flow_nodes.py

@@ -343,6 +343,31 @@ def execute(self, **kwargs: list[Any]) -> tuple[None, Any]:
         return (None, any_node_output)
 
 
+class IsConnected(ComfyNodeABC):
+    """
+    Checks if the input is connected.
+
+    This node returns True if the 'input' is connected to another node's output,
+    and False otherwise.
+    """
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "optional": {
+                "input": (IO.ANY, {}),
+            }
+        }
+
+    RETURN_TYPES = (IO.BOOLEAN,)
+    RETURN_NAMES = ("is_connected",)
+    CATEGORY = "Basic/flow control"
+    DESCRIPTION = cleandoc(__doc__ or "")
+    FUNCTION = "execute"
+
+    def execute(self, input: Any = None) -> tuple[bool]:
+        return (input is not None,)
+
+
 NODE_CLASS_MAPPINGS = {
     "Basic data handling: IfElse": IfElse,
     "Basic data handling: IfElifElse": IfElifElse,
@@ -351,6 +376,7 @@ def execute(self, **kwargs: list[Any]) -> tuple[None, Any]:
     "Basic data handling: FlowSelect": FlowSelect,
     "Basic data handling: ForceCalculation": ForceCalculation,
     "Basic data handling: ExecutionOrder": ExecutionOrder,
+    "Basic data handling: IsConnected": IsConnected,
 }
 
 NODE_DISPLAY_NAME_MAPPINGS = {
@@ -361,4 +387,5 @@ def execute(self, **kwargs: list[Any]) -> tuple[None, Any]:
     "Basic data handling: FlowSelect": "flow select",
     "Basic data handling: ForceCalculation": "force calculation",
     "Basic data handling: ExecutionOrder": "force execution order",
+    "Basic data handling: IsConnected": "is connected",
 }

tests/test_control_flow_nodes.py

@@ -1,6 +1,6 @@
 #import pytest
 from src.basic_data_handling.control_flow_nodes import (
-    IfElse, SwitchCase, IfElifElse, ContinueFlow, FlowSelect, ForceCalculation, ExecutionOrder
+    IfElse, SwitchCase, IfElifElse, ContinueFlow, FlowSelect, ForceCalculation, ExecutionOrder, IsConnected
 )
 
 
@@ -194,3 +194,14 @@ def test_execution_order():
     assert node.execute(other_kwarg="some_val") == (None, [])
     # with multiple kwargs
     assert node.execute(**{'any node output': "passthrough_val", "E/O": "ignored"}) == (None, "passthrough_val")
+
+
+def test_is_connected():
+    node = IsConnected()
+    # Test when input is connected (not None)
+    assert node.execute("connected") == (True,)
+    assert node.execute(0) == (True,)
+    assert node.execute(False) == (True,)
+    # Test when input is NOT connected (None)
+    assert node.execute(None) == (False,)
+    assert node.execute() == (False,)