How can a mapping have behavior dependent on the presence of a count?

Question

I have this mapping to move by visible line when wrap is enabled

nnoremap <silent> j gj
nnoremap <silent> k gk

But when I use a count (like 10 j), I expect to move by actual lines

How to make something like this

nnoremap <silent> j (moving_with_repeat ? j : gj)
nnoremap <silent> k (moving_with_repeat ? k : gk)

@DJMcMayhem Title is incorrect. I didn't want to know how to change mapping, I wanted to know whether I'm using command with count — srghma, Nov 1, 2017 at 21:05
FWIW: I prefer DJMcMayhem's suggested title, because it's a bit more specific. I think you were misreading it slightly, it's not suggesting that you want to know how to change the mapping, it's saying you want to create a mapping that changes based on the count. — Rich, Nov 3, 2017 at 9:24
I didn't quite understand the title so I updated with what I think is a clearer version. Hope you agree. — B Layer, Nov 24, 2017 at 12:17

Rich · Accepted Answer · 2017-11-03 14:45:19Z

10

You can use expression maps and Vim's predefined v:count variable to do this:

nnoremap <expr> j v:count > 1 ? "j" : "gj"
nnoremap <expr> k v:count > 1 ? "k" : "gk"

This checks the count and then performs the desired operation.

1 Answer 1