Display has an unintended effect

Question

I created a mapping to move the current line up one line.

:map _ ddkP

It works, except that when executed on the first line, it deletes the first line.

I would expect that nothing will happen, because they are carried out dd, k, Pin the first row, nothing happens. Where am I mistaken?

+3

countunique Feb 15 '14 at 22:32

2 answers

romainl · Answer 1 · 2014-02-15T23:20:22+0000

When you perform dd, k, P, commands are executed separately:

, . Vim , .

, .

dd , k , : Vim P.

" " - , .

- , , .

nnoremap _ :move-2<CR>

/.

Birei · Answer 2 · 2014-02-15T23:01:58+0000

map, , <expr> , , .

, vimrc :

function! Swap()
    if line('.') > 1 
        return 'ddkP'
    endif
    return ''
endfunction

map:

:map <expr> _ Swap()

, , if.