Table-of-contents Fold

folding.vim

" table of contents fold

" fold togle
nmap <F8>         :hi clear Folded<CR>:call Fold()<CR>

" next/pref fold
nmap     {                  kzkjz<CR>
nmap     }                  zjz<CR>



set nofoldenable                " start vim with folding off
hi Folded         term=bold ctermfg=8 ctermbg=0


set foldmethod=expr
set foldexpr=FoldExpr_fun('^[/a-zA-Z#]')        " regex for C++

fun FoldExpr_fun (regex) 
        if (getline(v:lnum) =~ a:regex)
                return ( ! (getline(v:lnum-1) =~ a:regex) ? ">1" : "1" )
        else                    
                return (   (getline(v:lnum+1) =~ a:regex) ? "<1" : "1" )
        endif
 endf


set foldtext=TitleLineDisplay()
set fillchars=""

fun TitleLineDisplay()  " Returns a String, to be displayed for a closed fold
        let line = getline(v:foldstart)
        return line
 endf

" toggler
fun Fold()
        if &foldenable
            exe "normal znzt"
            set foldlevel=0
        else
            exe "normal zNz."
        end 
 endf