#Modules import
import nuke
import subprocess

# Create DateWrite function
def DateWrite():

    # Create Variables
    selectedNodes = nuke.selectedNodes() # Get Selection of all selected nodes

    if len(selectedNodes) == 1:
        filePath = nuke.getFilename('Set Output Directory') # Asks the user to set an OutPut directory for the Write Node

        writeNode = nuke.createNode("Write") # Create a Write Node
        writeNode['file'].setValue(filePath + "[file rootname [file tail [value root.name]]]_[date %y][date %m][date %d]_[date %H][date %M].png") # Set the Write Node with TCL
        writeNode['afterRender'].setValue('openDirectoryAfterRender()') # Add a callback which will call the function openDirectoryAfterRender()

    else:
        nuke.message("No node selected or more than one node are selected.nPlease select only one node.")
    return filePath

# Create openDirectoryAfterRender
def openDirectoryAfterRender():
    directoryToOpen = DateWrite() # Get the returned directory from DateWrite() -but also execute DateWrite another time-
    directoryToOpen = directoryToOpen.replace('/','\') # Replace the slashes with backslashes

    subprocess.Popen('explorer %s' % directoryToOpen) # Open the chosen directory