Evaluating the cost to type something in vim

Hi,

I'd like to evaluate the cost of typing in vim. It should not just
simply counting the number of characters or words.

For example, the metric should capture things like the following and more.

- If there are two lines that are the same, people would type the
first line and copy-paste to generate the 2nd line. So the number of
keystrokes would be less than the total number of characters.
- If two strings are similar, people would make a copy and edit the copy.
- Repeatedly type something would be considered of less cost than type
non-repetitive characters of the same length.
- ctrl-P/N to save keystrokes for the words already typed before.
etc.

Is there a tool to evaluate the least cost to type something in vim as
accurately as possible? Thanks.

--
Regards,
Peng

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