Jtdcftul

Got this:

let Func = function(folding_function) "folding_function is name of function

setlocal foldexpr=call(Func(v:lnum))

This is so user can set a custom function for folding in their config file. I can't get it to work, though.

Also tried:

call(Func, v:lnum)

and

call(Func, 'v:lnum')

Code in context

" Set settings which are local to a window. In a new tab they would be reset to

" Vim defaults. So we enforce our settings here when the cursor enters a

" Vimwiki buffer.

function! s:set_windowlocal_options()

  if !&diff   " if Vim is currently in diff mode, don't interfere with its folding

    let foldmethod = vimwiki#vars#get_global('folding')

    if foldmethod =~? '^expr.*'

      setlocal foldmethod=expr

      let custom = vimwiki#vars#get_global('custom_fold_func')

      if custom

        let Func = function('VimwikiFoldLevelCustom')

        setlocal foldexpr=Func(v:lnum)

"        setlocal foldexpr=VimwikiFoldLevelCustom(v:lnum)

      else

        setlocal foldexpr=VimwikiFoldLevel(v:lnum)

      endif

      setlocal foldtext=VimwikiFoldText()

    elseif foldmethod =~? '^list.*' || foldmethod =~? '^lists.*'

      setlocal foldmethod=expr

      setlocal foldexpr=VimwikiFoldListLevel(v:lnum)

      setlocal foldtext=VimwikiFoldText()

    elseif foldmethod =~? '^syntax.*'

      setlocal foldmethod=syntax

      setlocal foldtext=VimwikiFoldText()

    elseif foldmethod =~? '^custom.*'

      " do nothing

    else

      setlocal foldmethod=manual

      normal! zE

    endif

  endif



  if vimwiki#vars#get_global('conceallevel') && exists("+conceallevel")

    let &conceallevel = vimwiki#vars#get_global('conceallevel')

  endif



  if vimwiki#vars#get_global('auto_chdir')

    exe 'lcd' vimwiki#vars#get_wikilocal('path')

  endif

endfunction

The value of the foldexpr option is evaluated to get the foldlevel of a line. You don't need to add extra call to it. You can copy following code in a new file and source it to check how it works.

" vim:set foldmethod=expr noexpandtab:



function! FoldingFunction(lnum)

  return getline(v:lnum)[0]==#"t"

endfunction

let Func = function('FoldingFunction') "FoldingFunction is name of function

setlocal foldexpr=Func(v:lnum)



finish



    fold

    fold

    fold

    fold

    fold

update

Your code doesn't work because your Func is a function local variable, change it to g:Func fix the problem.