How to apply new textwidth to whole buffer in Vim

Question

I've changed the textwidth option mid-way through my file and I'd like to reformat the whole buffer to use the new width. What's the quickest way to do this?

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Solution - Vim documentation topic

gq

Answer 1

See

:help gq

if it helps.

Answer 2

gq<motion>

For example, if your file consists of 100 lines, move to the first line and then press:

gq100<Down Arrow>

You can use the visual mode to select the lines and then press gq as well.