Can I make all "resize split" commands take a default count?

Question

While reading through this answer, I found these useful commands:

• Ctrl+W +/-: increase/decrease height
• Ctrl+W >/<: increase/decrease width

These are super useful, but I hate how it defaults to resizing by a single column at a time. I'd like it to move 10 columns at a time. I could do this:

nnoremap <C-w>+ 10<C-w>+
nnoremap <C-w>- 10<C-w>-
nnoremap <C-w>< 10<C-w><
nnoremap <C-w>> 10<C-w>>

But I dislike this solution. For one, it doesn't work well with counts. Sure, I could use <expr>, but that just makes it more complicated. The other thing is, this just feels like the wrong way to do it. Is there any setting such as :set resize_amount = 10?

Answer 1

There is not a setting that works as you've described, so you're probably on the best track already. Using <expr> and v:count can get you what you want:

nnoremap <expr> <C-w>+ v:count1 * 10 . '<C-w>+'
nnoremap <expr> <C-w>- v:count1 * 10 . '<C-w>-'
nnoremap <expr> <C-w>< v:count1 * 10 . '<C-w><'
nnoremap <expr> <C-w>> v:count1 * 10 . '<C-w>>'

v:count1 returns 1 if there is no count, as opposed to v:count which would return 0 if there is no count, which wouldn't be what we'd want here.

If you didn't want to move in increments of 10, but rather always just move at least 10 lines, just swap * for +.

In either case, if you need to resize by an amount that is either not multiple of 10 or is less than 10, :resize and :vertical resize will still cover that. See :help window-resize for more details on those. Alternately, see @Sato Katsura's comment for a method that works as stock with a count but uses a variable when no count is provided.