vim9script

export def Do(): string
    var bufsRaw = execute("buffers", "silent")
    var bufs: list<string>
    var leftIdx: number
    var rightIdx: number
    var filename: string
    var linenum: string
    var attrs: list<string>
    var attr: string
    var hl: string
    for buf in split(bufsRaw, "\n")[ : 16]
        leftIdx = stridx(buf, '"')
        rightIdx = strridx(buf, '"')
        filename = substitute(
            strpart(buf, leftIdx + 1, rightIdx - leftIdx - 1), "%", "%%", "g")
        linenum = split(strpart(buf, rightIdx), " ")[-1]
        attrs = split(strpart(buf, 0, leftIdx - 1), '\s\+')
        attrs = map(attrs, 'substitute(v:val, "%", "%%", "g")')
        attr = (len(attrs) == 1) ? attrs[0] : attrs[0] .. ":" .. join(attrs[1 :], "")
        attr = "%#TabLine#" .. attr .. "%*"
        if len(filename) > 20 | filename = "<" .. filename[-(20 - 1) :] | endif
        hl = (match(attr, "%%") == -1) ? "%#TabLine#:" : "%#TabLineSel#"
        bufs = add(bufs, attr .. hl .. filename .. ":" .. linenum .. "%*")
    endfor
    return join(bufs, "  ")
enddef