toggle-foldlevel.vim

if exists('g:loaded_toggle_foldlevel')
  finish
endif
 
let s:original_cpoptions = &cpoptions
set cpoptions&vim
 
function! s:toggle_foldlevel()
  if !exists('s:folded')
    let s:folded = 0
    let s:current_foldlevel = &foldlevel
  endif
 
  let s:current_line_foldlevel = foldlevel(line("."))
  if s:current_foldlevel != s:current_line_foldlevel
    let s:folded = 0
  endif
 
  if s:folded
    normal zR
    let s:folded = 0
  else
    let s:current_foldlevel = s:current_line_foldlevel
    let &foldlevel = s:current_foldlevel
    let s:folded = !0
  endif
endfunction
 
nnoremap <silent> <Plug>(toggle-foldlevel) :<C-u>call <SID>toggle_foldlevel()<Return>
 
if !exists('g:toggle_foldlevel_no_key_mapping')
  silent! map <unique> zz <Plug>(toggle-foldlevel)
endif
 
 
let &cpoptions = s:original_cpoptions
 
let g:loaded_toggle_foldlevel = !0