set_tabline.vim

function! CustomizedTabLine()
    let s = ''
    let t = tabpagenr()
    let i = 1
    while i <= tabpagenr('$')
        let buflist = tabpagebuflist(i)
        let winnr = tabpagewinnr(i)
        let s .= '%' . i . 'T'
        let s .= (i == t ? '%1*' : '%2*')
        let s .= ' '
        let s .= i . ':'
        let s .= '%*'
        let s .= (i == t ? '%#TabLineSel#' : '%#TabLine#')
        let file = bufname(buflist[winnr - 1])
        let file = fnamemodify(file, ':p:t')
        if file == ''
            let file = '[No Name]'
        endif
        let s .= file
        let s .= ' '
        let i = i + 1
    endwhile
    let s .= '%T%#TabLineFill#%='
    let s .= (tabpagenr('$') > 1 ? '%999XX' : 'X')
    return s
endfunction

" Always show the tablilne 
set stal=2
set tabline=%!CustomizedTabLine()