vimtex/autoload/toc.vim

" LaTeX plugin for Vim
"
" Maintainer: Karl Yngve Lervåg
" Email:      karl.yngve@gmail.com
"

function! toc#fold_level(lnum) " {{{1
  let pline = getline(a:lnum - 1)
  let cline = getline(a:lnum)
  let nline = getline(a:lnum + 1)
  let l:pn = matchstr(pline, '\d$')
  let l:cn = matchstr(cline, '\d$')
  let l:nn = matchstr(nline, '\d$')

  " Don't fold options
  if cline =~# '^\s*$'
    return 0
  endif

  if l:nn > l:cn && g:latex_toc_fold_levels >= l:nn
    return '>' . l:nn
  endif

  if l:cn < l:pn && l:cn >= l:nn && g:latex_toc_fold_levels >= l:cn
    return l:cn
  endif

  return '='
endfunction

function! toc#fold_text() " {{{1
  return getline(v:foldstart)
endfunction

" }}}1

" vim: fdm=marker