为标签页的标题添加序号

在~/.vimrc中添加如下：

"为标签页的标题添加序号
if exists("+showtabline")
    function! MyTabLine()
        let s = ''
        let wn = ''
        let t = tabpagenr()
        let i = 1 
        while i <= tabpagenr('$')
            let buflist = tabpagebuflist(i)
            let winnr = tabpagewinnr(i)
            let s .= '%' . i . 'T' 
            let s .= (i == t ? '%1*' : '%2*')
            let s .= ' ' 
            let wn = tabpagewinnr(i,'$')

            let s .= '%#TabNum#'
            let s .= i
            " let s .= '%*'
            let s .= (i == t ? '%#TabLineSel#' : '%#TabLine#')
            let bufnr = buflist[winnr - 1]
            let file = bufname(bufnr)
            let buftype = getbufvar(bufnr, 'buftype')
            if buftype == 'nofile'
                if file =~ '\/.'
                    let file = substitute(file, '.*\/\ze.', '', '') 
                endif
            else
                let file = fnamemodify(file, ':p:t')
            endif
            if file == ''
                let file = '[No Name]'
            endif
            let s .= ' ' . file . ' ' 
            let i = i + 1 
        endwhile
        let s .= '%T%#TabLineFill#%='
        let s .= (tabpagenr('$') > 1 ? '%999XX' : 'X')
        return s
    endfunction
    set stal=2
    set tabline=%!MyTabLine()
    set showtabline=1
    highlight link TabNum Special
endif