def _add_to_filemenu():
    """Helper function for the above :func:add_to_filemenu()

    This function is serialised into a string and passed on
    to evalDeferred above.

    """

    import os
    import pyblish
    from maya import cmds

    # This must be duplicated here, due to this function
    # not being available through the above `evalDeferred`
    for item in ("pyblishOpeningDivider",
                 "pyblishScene",
                 "pyblishCloseDivider"):
        if cmds.menuItem(item, exists=True):
            cmds.deleteUI(item, menuItem=True)

    icon = os.path.dirname(pyblish.__file__)
    icon = os.path.join(icon, "icons", "logo-32x32.svg")

    cmds.menuItem("pyblishOpeningDivider",
                  divider=True,
                  insertAfter="saveAsOptions",
                  parent="mainFileMenu")

    cmds.menuItem("pyblishScene",
                  insertAfter="pyblishOpeningDivider",
                  label="Publish",
                  parent="mainFileMenu",
                  image=icon,
                  command="import pyblish_maya;pyblish_maya.show()")

    cmds.menuItem("pyblishCloseDivider",
                  insertAfter="pyblishScene",
                  parent="mainFileMenu",
                  divider=True)
Helper function for the above :func:add_to_filemenu()

    This function is serialised into a string and passed on
    to evalDeferred above.