foldtext.vim

"this replaces default foldtext 
"Change foldtext (http://dhruvasagar.com/2013/03/28/vim-better-foldtext)

function! NeatFoldText() 
  let line = ' ' . substitute(getline(v:foldstart), '^\s*"\?\s*\|\s*"\?\s*{{' . '{\d*\s*', '', 'g') . ' '
  let lines_count = v:foldend - v:foldstart + 1
  let lines_count_text = '| ' . printf("%10s", lines_count . ' lines') . ' |'
  let foldchar = matchstr(&fillchars, 'fold:\zs.')
  let foldtextstart = strpart('+' . repeat(foldchar, v:foldlevel*2) . line, 0, (winwidth(0)*2)/3)
  let foldtextend = lines_count_text . repeat(foldchar, 8)
  let foldtextlength = strlen(substitute(foldtextstart . foldtextend, '.', 'x', 'g')) + &foldcolumn
  return foldtextstart . repeat(foldchar, winwidth(0)-foldtextlength) . foldtextend
endfunction

" version from http://vim.wikia.com/wiki/Customize_text_for_closed_folds
" this version isn't used right now."
fu! MyFoldText()
  let line = getline(v:foldstart)
  if match( line, '^[ \t]*\(\/\*\|\/\/\)[*/\\]*[ \t]*$' ) == 0
    let initial = substitute( line, '^\([ \t]\)*\(\/\*\|\/\/\)\(.*\)', '\1\2', '' )
    let linenum = v:foldstart + 1
    while linenum < v:foldend
      let line = getline( linenum )
      let comment_content = substitute( line, '^\([ \t\/\*]*\)\(.*\)$', '\2', 'g' )
      if comment_content != ''
        break
      endif
      let linenum = linenum + 1
    endwhile
    let sub = initial . ' ' . comment_content
  else
    let sub = line
    let startbrace = substitute( line, '^.*{[ \t]*$', '{', 'g')
    if startbrace == '{'
      let line = getline(v:foldend)
      let endbrace = substitute( line, '^[ \t]*}\(.*\)$', '}', 'g')
      if endbrace == '}'
        let sub = sub.substitute( line, '^[ \t]*}\(.*\)$', '...}\1', 'g')
      endif
    endif
  endif
  let n = v:foldend - v:foldstart + 1
  let info = " " . n . " lines"
  let sub = sub . "                                                                                                                  "
  let num_w = getwinvar( 0, '&number' ) * getwinvar( 0, '&numberwidth' )
  let fold_w = getwinvar( 0, '&foldcolumn' )
  let sub = strpart( sub, 0, winwidth(0) - strlen( info ) - num_w - fold_w - 1 )
  return sub . info
endfunction

set foldtext=NeatFoldText() " I like this better"
"set foldtext=MyFoldText()