Yeah, I love vim, but that’s not its forte

    : help case

To turn one line into title caps, make every first letter of a word uppercase:

    :s/\v<(.)(\w*)/\u\1\L\2/g

That's not title case - you don't capitalize words such as a, the, of, etc. unless they are at the beginning of the title.

> That's not title case - you don't capitalize words such as a, the, of, etc. unless they are at the beginning of the title.

Exactly. Capitalizing every letter is the lazy, half-ass pseudo title case that I always have to correct. Unfortunately its becoming normalized because many major companies that should know better don't even bother to do it right.