Implement rot13 cypher #179
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Why
ROT13 cypher is a weak cypher that allows you to quickly masquerade some text. It's a self-inverse function, so applying it again will decrypt the text. Original Vim implements ROT13 cypher under the
g?keybinding.It is particularly useful for note-taking as an example. In a studying scenario, you can write down questions with answers while applying ROT13 on the latter. To check the answers, you simply need to apply the transformation again.
What changed
Added the
g?operator.Test plan
I modified the tests for
guandgU, since they implement similar functionality. I currently test:g?g?on a single lineg?with motionsg?in visual mode