# change based on OS

import platform

# creates user system variables
varRoot_Win = nuke.getInput('Windows File Root', 'E:/')
varRoot_Lin = nuke.getInput('Linux File Root', '/media/Waterfall/')

# make sure that the file paths end in a backslash (/)
if varRoot_Win[ len(varRoot_Win) - 1 ] != '/':
    varRoot_Win += '/'
if varRoot_Lin[ len(varRoot_Lin) - 1 ] != '/':
    varRoot_Lin += '/'

# create a list of all of only the Read nodes in the Nuke script
a = nuke.allNodes('Read')

if (platform.system() == 'Windows') or (platform.system() == 'Microsoft'):
    print 'OS = Windows'
else:
    print 'OS = Linux'

i = 0
for n in a:
    # set the working node from the list of nodes based on it's name
    b = nuke.toNode(a[i].name())

    # get the file path for the current node
    c = b['file'].getValue()

    # query the OS and change the file path appropiately
    if (platform.system() == 'Windows') or (platform.system() == 'Microsoft'):
        d = c.replace(varRoot_Lin, varRoot_Win)
    else:
        d = c.replace(varRoot_Win, varRoot_Lin)

    # replace the file path with the new file path
    b['file'].setValue(d)

    i += 1