随风老师你好，为什么我的 buffer 只有在 2 个及以上的 tab 页时才展示, 是哪里出现的问题了？打开多个文件都只是在同一个 tab 中, 所以不展示 buffer

===========================================================================
` .vimrc
set nocompatible

set number
set guitablabel=%-0.40t%M

" set scrolljump=5 " lines to scroll when cursor leaves screen
set scrolloff=6 " minimum lines to keep above and below cursor

" 减少刷新和重画
set lz

let html_no_rendering=1

" Open new split windows to the right/bottom
" set splitright splitbelow
set splitright

set tabstop=2
set expandtab
set smarttab
set shiftwidth=2
set softtabstop=2

set autoindent
set smartindent

" set gcr=n:blinkon0

let mapleader = ','

" 文字过长时断行显示
set wrap

" 设置折叠方法
set fdm=manual

" 进入编辑模式时按 tab 弹出菜单
set wildmenu
set wildmode=list:longest,full

" 修复 backspace 键的作用
inoremap
set whichwrap+=[

" 设置一行最多 80 个字符
" set textwidth=80

" 自动重新读入
set autoread

" 备份和缓存
set nobackup
set noswapfile
set nowritebackup

" 高亮搜索
set hlsearch
set incsearch

" no bell
set noeb vb t_vb=
au GUIEnter * set vb t_vb=

set mouse=a

" 启动的时候不显示那个援助索马里儿童的提示
set shortmess=atI

" 搜索时忽略大小写
set ignorecase
set smartcase

" 设置编码
set encoding=utf-8
set fencs=utf-8,ucs-bom,shift-jis,gb18030,gbk,gb2312,cp936

" 设置标题
set title
set titlestring=%-25.55F\ %a%r%m titlelen=70"

" 高亮当前行
set cursorline

" 修改 vmirc 后自动生效
map l :source ~/.vimrc
autocmd! bufwritepost .vimrc source ~/.vimrc

" 去掉工具栏
set go-=T

" 回到上次编辑的地方
au BufReadPost * if line("'\"") > 0|if line("'\"") <= line("$")|exe("norm '\"")|else|exe "norm $"|endif|endif

call plug#begin('~/.vim/plugged')
if filereadable(expand("~/.vim/.vimrc.bundle"))
source ~/.vim/.vimrc.bundle
endif
call plug#end()

if filereadable(expand("~/.vim/.vimrc.settings"))
source ~/.vim/.vimrc.settings
endif

" colorscheme
if ! has('gui_running')
set termguicolors
set t_Co=256
endif

set background=dark

if has("gui_running")
set linespace=2
set guioptions=
else
set nocursorline
endif

set guifont=Monaco\ Nerd\ Font\ Mono:h12
colorscheme molokai

===========================================================================
` .vimrc.settings
let g:ascii = [
\ ' # # #####',
\ ' # # # #',
\ ' # # # #',
\ ' # # # #',
\ ' # # # # #',
\ ' #### ###### #####',
]

" NerdTree
map :NERDTreeToggle:NERDTreeMirror
map e :NERDTreeFind
let NERDTreeIgnore=['.pyc', '~$', '.swo$', '.swp$', '.git', '.hg', '.svn', '.bzr']
autocmd vimenter * if ! argc() | NERDTree | endif
autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTreeType") && b:NERDTreeType == "primary") | q | endif
let NERDTreeWinSize=33
let NERDTreeQuitOnOpen=0
let NERDTreeShowHidden=1
autocmd VimEnter * wincmd l
autocmd BufNew * wincmd l

" airline
let g:airline_theme="molokai"
" status line
set laststatus=2

" jsdoc

" easy_align
vnoremap :EasyAlign

" indent_guides
let g:indent_guides_auto_colors = 0
autocmd VimEnter,Colorscheme * :hi IndentGuidesOdd guibg=#212121 ctermbg=3
autocmd VimEnter,Colorscheme * :hi IndentGuidesEven guibg=#404040 ctermbg=4
set ts=2 sw=2 et
let g:indent_guides_start_level = 2
let g:indent_guides_guide_size = 1
let g:indent_guides_enable_on_vim_startup = 0

" ack
if executable('ag')
let g:ackprg = "ag -H --nocolor --nogroup --column --vimgrep"
endif
cnoreabbrev ag Ack
cnoreabbrev aG Ack
cnoreabbrev AG Ack
cnoreabbrev Ag Ack

" Buffer explorer
nmap n :BufExplorer
let g:bufExplorerDefaultHelp=0
let g:bufExplorerShowRelativePath=1

"
" vim-xtabline
let g:xtabline_settings = get(g:, 'xtabline_settings', {})
let g:xtabline_settings.map_prefix = 'x'
let g:xtabline_settings.tabline_modes = ['buffers', 'tabs']
autocmd vimenter * XTabTheme slate
autocmd bufenter * XTabTheme slate
"

" vim-devicons
let g:WebDevIconsNerdTreeAfterGlyphPadding = ''
let g:WebDevIconsNerdTreeGitPluginForceVAlign = 0

" glyph-palette
augroup my-glyph-palette
autocmd! *
autocmd FileType fern call glyph_palette#apply()
autocmd FileType nerdtree,startify call glyph_palette#apply()
augroup END

"
" startify
"
let g:startify_custom_header = g:ascii + startify#fortune#boxed()

map o :Startify
let g:startify_files_number = 15
let g:startify_lists = [
\ { 'type': 'files', 'header': [' Files'] },
\ { 'type': 'bookmarks', 'header': [' Bookmarks'] },
\ { 'type': 'dir', 'header': [' Current Directory '. getcwd()] },
\ ]

let g:startify_bookmarks = [
\ { 's': '~/.vim/.vimrc.settings' },
\ { 'b': '~/.vim/.vimrc.bundle' },
\ { 'v': '~/.vimrc' },
\ { 'z': '~/.zshrc' },
\ { 'l': '~/lesson'},
\ ]

let g:startify_enable_special = 0

let g:startify_custom_footer =
\ ['', " jld", '']

" ----------------------------------------
" settings
" ----------------------------------------
" copy paste
vmap "+y
map ggVG
cnoremap %% =expand('%:h').'/'

" edit
map ew :e %%
map es :sp %%
map ev :vsp %%
map et :tabe %%

" quit
map :q
map q :q

" tab
noremap :tabnew split

" save
map s :w
cmap w!! w ! sudo tee >/dev/null %
inoremap :w
nnoremap :w

"
" 移动
"
map j
map k
map h
map l

" Wrapped lines goes down/up to next row, rather than next line in file.
nnoremap j gj
nnoremap k gk

" Highlight word at cursor without changing position
nnoremap h *

nmap ,/ :nohlsearch
map :1,%s/\s+(\%#)\@!$//g
map mp :set matchpairs=

map :! ruby %

noremap :bn
noremap :bp

`

`

你好！方便发下 Ruby 基础教程（第 5 版）pdf 吗！谢谢！
找了一下没找到，还望大佬助我 mr.j@tom.com ！

🙏