Swaping lines in VIM

~/.vim/plugin/swap_lines.vim

CTRL-J
CTRL-K

source: http://stackoverflow.com/questions/741814/move-entire-line-up-and-down-in-vim

function! s:swap_lines(n1, n2)
    let line1 = getline(a:n1)
    let line2 = getline(a:n2)
    call setline(a:n1, line2)
    call setline(a:n2, line1)
endfunction

function! s:swap_up()
    let n = line('.')
    if n == 1
        return
    endif

    call s:swap_lines(n, n - 1)
    exec n - 1
endfunction

function! s:swap_down()
    let n = line('.')
    if n == line('$')
        return
    endif

    call s:swap_lines(n, n + 1)
    exec n + 1
endfunction

noremap <silent> <c-j> :call <SID>swap_up()<CR>
noremap <silent> <c-k> :call <SID>swap_down()<CR>