def indexFile(tree, materialPath):
""" Gives the user an option to choose which file to index to the tree """
fileList = File.getFileNames(materialPath)
printPath = File.printFileList(materialPath, noPath='yes')
input = prompt('Choose file:', limits = [0, len(fileList)])
print 'Indexing "' + printPath[input] + '" now...'
tree.lukija.clear()
tree.lukija.addFileName(fileList[input])
tree.lukija.readWords()
tree.addFromReader()
