code folding - Is it possible to jump to the next closed fold in Vim?

Question

In Vim, I often find myself wanting to do a quick zk or zj to jump to the previous or next fold in a file. The problem is, I frequently want to skip all the open folds, and just jump to the nearest closed fold.

Is there a way to do this? I see no built-in keymap in the help.

Answer 1

Let me propose the following implementation of the described behavior.

nnoremap <silent> <leader>zj :call NextClosedFold('j')<cr>
nnoremap <silent> <leader>zk :call NextClosedFold('k')<cr>

function! NextClosedFold(dir)
    let cmd = 'norm!z' . a:dir
    let view = winsaveview()
    let [l0, l, open] = [0, view.lnum, 1]
    while l != l0 && open
        exe cmd
        let [l0, l] = [l, line('.')]
        let open = foldclosed(l) < 0
    endwhile
    if open
        call winrestview(view)
    endif
endfunction

If it is desirable for the mappings to accept a count for the number of repetitions of the corresponding movement, one can implement a simple function for repeating any given command:

function! RepeatCmd(cmd) range abort
    let n = v:count < 1 ? 1 : v:count
    while n > 0
        exe a:cmd
        let n -= 1
    endwhile
endfunction

and then redefine the above mappings as follows:

nnoremap <silent> <leader>zj :<c-u>call RepeatCmd('call NextClosedFold("j")')<cr>
nnoremap <silent> <leader>zk :<c-u>call RepeatCmd('call NextClosedFold("k")')<cr>