mirrorNodes

2.1 - Nuke 13 compatible

2.0 - added optional argumebt to use last or first selected node as the axis for mirroring

     - mirror is animated to keep track of nodes
     - the required menu entries are included in teh module now so the local menu.py only needs this line: import mirrorNodes

1.1 - corrected resulting positions and made undo work

Mirrors the nodes in the node graph to quickly rearrange portions of the DAG.

example menu.py entry (included in v2.0):

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menuBar = nuke.menu('Nuke')
menuBar.addCommand('Edit/Node/Mirror/horizontally', 'mirrorNodes.mirrorNodes( nuke.selectedNodes(), direction='x' )', 'alt+ctrl+x')
menuBar.addCommand('Edit/Node/Mirror/vertically', 'mirrorNodes.mirrorNodes( nuke.selectedNodes(), direction='y' )', 'alt+ctrl+y')

for v2.0+ simply put this in your menu.py:
    import mirrorNodes

before: 

I map things like this to hotkeys and hide them in that ridiculously deep sub menu:

after: