How do I make the tilde key work as a case-toggle operator so I can use motions like ~w or ~ip?

Explanation

By default, ~ toggles the case of a single character and advances the cursor. With set tildeop, ~ becomes a full operator — you can combine it with any motion or text object to toggle case across a range, just like d, y, or c.

How it works

Once tildeop is enabled:

• ~w — toggle case of the current word
• ~ip — toggle case of the inner paragraph
• ~$ — toggle case from cursor to end of line
• ~G — toggle case from here to end of file
• 5~~ — toggle case of 5 lines (using ~~ as the line-wise form)

This mirrors how g~{motion} works, but lets you use the shorter ~ key as the operator.

Example

With cursor at the start of:

hELLO wORLD

Press ~$ to toggle case to end of line:

Hello World

Tips

• g~{motion} always works as a case-toggle operator, even without tildeop — useful as a fallback when sharing configs
• gU{motion} uppercases, gu{motion} lowercases — use these when you need a specific case rather than a toggle
• Without tildeop, ~ still works character-by-character when used without a motion
• Add set tildeop to your vimrc to make it permanent