From 349d50b26d61dae64e4e7606818d019c075615e2 Mon Sep 17 00:00:00 2001
From: Marcus Ottosson <konstruktion@gmail.com>
Date: Thu, 26 Nov 2020 08:24:46 +0000
Subject: [PATCH 1/4] Add Node.exists

---
 cmdx.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/cmdx.py b/cmdx.py
index 49c51c3..7051cd1 100644
--- a/cmdx.py
+++ b/cmdx.py
@@ -3861,6 +3861,18 @@ def _python_to_mod(value, plug, mod):
     return True
 
 
+def exists(path):
+    """Return whether any node at `path` exists"""
+
+    selectionList = om.MSelectionList()
+
+    try:
+        selectionList.add(path)
+    except RuntimeError:
+        return False
+    return True
+
+
 def encode(path):
     """Convert relative or absolute `path` to cmdx Node
 

From 0d504d3824fd483786eb76314320f179b07c3b00 Mon Sep 17 00:00:00 2001
From: Marcus Ottosson <konstruktion@gmail.com>
Date: Thu, 26 Nov 2020 08:24:58 +0000
Subject: [PATCH 2/4] Add DagNode.childCount

---
 cmdx.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/cmdx.py b/cmdx.py
index 7051cd1..f1678da 100644
--- a/cmdx.py
+++ b/cmdx.py
@@ -1332,6 +1332,19 @@ def show(self):
         """Set visibility to True"""
         self["visibility"] = True
 
+    def childCount(self, type=None):
+        """Return number of children of a given optional type
+
+        Compared to `MFnDagNode.childCount`, this function actually returns
+        children, not shapes, along with filtering by an optional type.
+
+        Arguments:
+            type (str): Same as to .children(type=)
+
+        """
+
+        return len(list(self.children(type=type)))
+
     def addChild(self, child, index=Last, safe=True):
         """Add `child` to self
 
@@ -1744,6 +1757,7 @@ def setLimit(self, typ, value):
     if ENABLE_PEP8:
         shortest_path = shortestPath
         add_child = addChild
+        child_count = childCount
         dag_path = dagPath
         map_from = mapFrom
         map_to = mapTo

From 5b307e1336818d6cf3679b20f788b2170a8fe865 Mon Sep 17 00:00:00 2001
From: Marcus Ottosson <konstruktion@gmail.com>
Date: Fri, 27 Nov 2020 10:26:11 +0000
Subject: [PATCH 3/4] Improve error reporting done by DagModifier

---
 cmdx.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmdx.py b/cmdx.py
index f1678da..5fc0ef4 100644
--- a/cmdx.py
+++ b/cmdx.py
@@ -4162,6 +4162,11 @@ def doIt(self):
                 self.undoIt()
 
             raise ModifierError(self._history)
+        else:
+
+            # Facilitate multiple calls to doIt, whereby only
+            # the latest, actually-performed actions are reported
+            self._history[:] = []
 
         self.isDone = True
 

From 9ed04f72ec73a1543d1d93ea55452ef27f4227f9 Mon Sep 17 00:00:00 2001
From: Marcus Ottosson <konstruktion@gmail.com>
Date: Fri, 27 Nov 2020 10:26:26 +0000
Subject: [PATCH 4/4] Add cmdx.connect for convenience with undo

---
 cmdx.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cmdx.py b/cmdx.py
index 5fc0ef4..e248327 100644
--- a/cmdx.py
+++ b/cmdx.py
@@ -4428,6 +4428,12 @@ def parent(self, node, parent=None):
         create_node = createNode
 
 
+# Convenience functions
+def connect(a, b):
+    with DagModifier() as mod:
+        mod.connect(a, b)
+
+
 class DGContext(om.MDGContext):
 
     def __init__(self, time=None, unit=None):