add the script to clean up a nuke scene

host/nuke/python/clean_nuke_setup.py

@@ -0,0 +1,71 @@
+# Keep Openpype Instances and all their dependencies
+# and remove everything else.
+# some functions are copied and adopted from
+#   https://github.com/seaniedan/nuketools by Sean Danischevsky 2014
+
+
+import nuke
+from openpype.hosts.nuke.api.pipeline import list_instances
+
+
+def upstream(nodes):
+    if not nodes:
+        return []
+
+    dependencies = nuke.dependencies(
+        nodes,
+        nuke.EXPRESSIONS|nuke.INPUTS|nuke.HIDDEN_INPUTS
+    )
+    for dependency in dependencies:
+        nodes.extend(upstream([dependency]))
+
+    return nodes
+
+
+def select_upstream_sd(nodes):
+    """ select all upstream nodes (dependencies) of given nodes
+        and optionally backdrops if the nodes are on backdrops
+    """
+    if not nodes:
+        return
+
+    #recursive dependencies (upstream nodes)
+    nodes+= upstream(nodes)
+
+    #add backdrops:
+    for bd in nuke.allNodes("BackdropNode"):
+        bd_nodes = bd.getNodes()
+        for node in nodes:
+            if node in bd_nodes:
+                nodes.append(bd)
+                break
+
+    #remove any duplicates
+    nodes= list(set(nodes))
+
+    #select them
+    for node in nodes:
+        node.setSelected(True)
+
+    #return the list
+    return nodes
+
+
+def cleanupScript():
+    instances = list_instances()
+    nodes =  [i[0] for i in instances]
+    if not nodes:
+        nodes = nuke.selectedNodes()
+    if not nodes:
+        print("Operation Failed. No selected nodes found.")
+        return
+
+    upstream_nodes = select_upstream_sd(nodes)
+    delete_list= [
+        node for node in nuke.allNodes()
+        if node not in upstream_nodes and node.Class() != "Viewer"
+    ]
+
+    # delete nodes we do not need anymore
+    for node in delete_list:
+        nuke.delete(node)