vim vimscript：autoCMD将foldcolumn设置为foldlevel

Question

我的目标是自动设置

foldcolumn

最深

foldlevel.。 我尝试了：

autocmd FileType html :set foldmethod=syntax
autocmd FileType html :let &foldcolumn=&foldlevel

但显示错误：

在处理“ HTML”的FileType Autocomands时检测到Error： e521：需要的数字=：foldcolumn =＆foldlevel

方法是：

1st：仅设在.vimrc中：

autocmd FileType html :set foldmethod=syntax

执行下一个地图打开缓冲区：

nnoremap <leader>cf  :let &foldcolumn=&foldlevel<cr>:set foldcolumn?<cr>

或增加1次

nnoremap <leader>cf :let &foldcolumn = &foldcolumn + 1<cr>:set foldcolumn?<cr> ，如果它是自动的，那可能很棒。如何解决错误？预先感谢

工作室

" Find the deepest fold level in the buffer
function! GetDeepestFoldLevel()
  " foldlevel is foldcolumn of current line
  let max_level = 0
  for lnum in range(1, line('$'))
    let level = foldlevel(lnum)
    if level > max_level
      let max_level = level
    endif
  endfor
  return max_level
endfunction

" Check if foldcolumn should be updated
function! ShouldUpdateFoldColumn()
  return !exists('b:foldcolumn_set') || !b:foldcolumn_set
endfunction

" Update foldcolumn
function! UpdateFoldColumnForce()
    let &foldcolumn = GetDeepestFoldLevel() + 1
endfunction
function! UpdateFoldColumn()
  if ShouldUpdateFoldColumn()
    call UpdateFoldColumnForce()
  endif
endfunction

" Check if foldcolumn is set by modeline and mark it as set
function! CheckFoldColumnSet()
  " Set buffer variable to 1 if foldcolumn is explicitly set (not default value 0).
  " Counterparts:
  "  - if modeline has 'foldcolumn=0' then it is ignored.
  "  - foldcolumn set of autocmd set to a none zero value like next, makes next always false.
  "      autocmd FileType javascript :set foldcolumn=2
  if &foldcolumn != 0
    let b:foldcolumn_set = 1
  endif
endfunction

" Auto-update foldcolumn AFTER modeline processing (using BufWinEnter)
autocmd BufWinEnter * call CheckFoldColumnSet() | call UpdateFoldColumn()

" ColumFold to Maximun foldlevel
nnoremap <leader>cfM :call UpdateFoldColumnForce()<CR>

" Check:
" :echo 'foldcolumn=' &foldcolumn '; foldlevel_current_line_or_deepest_been=' &foldlevel
" Check. Show '-1' if foldcolumn is not explicitly set:
" :echo get(b:, 'foldcolumn_set', -1)

Answer 1