def performUndo(null):
repoCaller = Repo()
indexOfOperations = repoCaller.getIndexOfOperations()
listOfOperations = repoCaller.getListOfOperations()
commands = {
"removeB": removeABook,
"removeC": removeAClient,
"addB": addABook,
"addC": addAClient,
"updateB": updateABook,
"updateC": updateAClient
}
if indexOfOperations >= 0:
commands[Undo.getFuntion(listOfOperations[indexOfOperations])](
Undo.getParameters(listOfOperations[indexOfOperations]))
repoCaller.decrementIndex()
repoCaller.setRedoTrue()
else:
return "Cannot undo anymore"
return False
