How to change the way that vim displays collapsed/folded lines

Question

How can I change the way that vim displays those collapsed/folded lines? I would like it toshow hidden line numbers at line tail but not the head. I have googled and searched vim wiki but found no hints.

The fold style is just like the right hand side of the pic.

Answer 1

You could play with the method described in this blog post:

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

set foldtext=NeatFoldText()

There are many, variants, actually; and there's even a vimcast on that very subject.