akinsho / bufferline.nvim

A snazzy bufferline for Neovim

bufferline.nvim

A snazzy 💅 buffer line (with tabpage integration) for Neovim built using lua.

• Requirements
• Installation
• Usage
• Configuration
• Features
  • Alternate styling
  • Hover events
  • Underline indicator
  • Tabpages
  • LSP indicators
  • Groups
  • Sidebar offsets
  • Numbers
  • Picking
  • Pinning
  • Unique names
  • Close icons
  • Re-ordering
  • Custom areas
• How do I see only buffers per tab?
• Caveats
• FAQ

This plugin shamelessly attempts to emulate the aesthetics of GUI text editors/Doom Emacs. It was inspired by a screenshot of DOOM Emacs using centaur tabs.

Requirements

• Neovim 0.8+
• A patched font (see nerd fonts)
• A colorscheme (either your custom highlight or a maintained one somewhere)

Installation

It is advised that you specify either the latest tag or a specific tag and bump them manually if you'd prefer to inspect changes before updating. If you'd like to use an older version of the plugin compatible with nvim-0.6.1 and below please change your tag to tag = "v1.*"

Lua

-- using packer.nvim
use {'akinsho/bufferline.nvim', tag = "*", requires = 'nvim-tree/nvim-web-devicons'}

-- using lazy.nvim
{'akinsho/bufferline.nvim', version = "*", dependencies = 'nvim-tree/nvim-web-devicons'}

Vimscript

Plug 'nvim-tree/nvim-web-devicons' " Recommended (for coloured icons)
" Plug 'ryanoasis/vim-devicons' Icons without colours
Plug 'akinsho/bufferline.nvim', { 'tag': '*' }

Usage

See the docs for details :h bufferline.nvim

You need to be using termguicolors for this plugin to work, as it reads the hex gui color values of various highlight groups.

Vimscript

" In your init.lua or init.vim
set termguicolors
lua << EOF
require("bufferline").setup{}
EOF

Lua

vim.opt.termguicolors = true
require("bufferline").setup{}

You can close buffers by clicking the close icon or by right clicking the tab anywhere

Configuration

for more details on how to configure this plugin in details please see :h bufferline-configuration

Features

• Colours derived from colorscheme where possible.

• Sort buffers by extension, directory or pass in a custom compare function

• Configuration via lua functions for greater customization.

Alternate styling

Slanted tabs

NOTE: some terminals require special characters to be padded so set the style to padded_slant if the appearance isn't right in your terminal emulator. Please keep in mind though that results may vary depending on your terminal emulator of choice and this style might will not work for all terminals

Sloped tabs

see: :h bufferline-styling

---

Hover events

NOTE: this is only available for >= neovim 0.8+

see :help bufferline-hover-events for more information on configuration

---

Underline indicator

NOTE: as with the above your mileage will vary based on your terminal emulator. The screenshot above was achieved using kitty nightly (as of August 2022), with increased underline thickness and an increased underline position so it sits further from the text

---

Tabpages

This plugin can also be set to show only tabpages. This can be done by setting the mode option to tabs. This will change the bufferline to a tabline it has a lot of the same features/styling but not all.

A few things to note are

• Sorting doesn't work yet as that needs to be thought through.
• Grouping doesn't work yet as that also needs to be thought through.

---

LSP indicators

By setting diagnostics = "nvim_lsp" | "coc" you will get an indicator in the bufferline for a given tab if it has any errors This will allow you to tell at a glance if a particular buffer has errors.

In order to customise the appearance of the diagnostic count you can pass a custom function in your setup.

snippet

-- rest of config ...

--- count is an integer representing total count of errors
--- level is a string "error" | "warning"
--- diagnostics_dict is a dictionary from error level ("error", "warning" or "info")to number of errors for each level.
--- this should return a string
--- Don't get too fancy as this function will be executed a lot
diagnostics_indicator = function(count, level, diagnostics_dict, context)
  local icon = level:match("error") and " " or " "
  return " " .. icon .. count
end

snippet

diagnostics_indicator = function(count, level, diagnostics_dict, context)
  local s = " "
  for e, n in pairs(diagnostics_dict) do
    local sym = e == "error" and " "
      or (e == "warning" and " " or "" )
    s = s .. n .. sym
  end
  return s
end

The highlighting for the file name if there is an error can be changed by replacing the highlights for see:

:h bufferline-highlights

LSP indicators can additionally be reported conditionally, based on buffer context. For instance, you could disable reporting LSP indicators for the current buffer and only have them appear for other buffers.

diagnostics_indicator = function(count, level, diagnostics_dict, context)
  if context.buffer:current() then
    return ''
  end

  return ''
end

The first bufferline shows diagnostic.lua as the currently opened current buffer. It has LSP reported errors, but they don't show up in the bufferline. The second bufferline shows 500-nvim-bufferline.lua as the currently opened current buffer. Because the 'faulty' diagnostic.lua buffer has now transitioned from current to visible, the LSP indicator does show up.

---

Groups

The buffers this plugin shows can be grouped based on a users configuration. Groups are a way of allowing a user to visualize related buffers in clusters as well as operating on them together e.g. by clicking the group indicator all grouped buffers can be hidden. They are partially inspired by google chrome's tabs as well as centaur tab's groups.

see :help bufferline-groups for more information on how to set these up

---

Sidebar offsets

---

Numbers

You can prefix buffer names with either the ordinal or buffer id, using the numbers option. Currently this can be specified as either a string of buffer_id | ordinal or a function

see :help bufferline-numbers for more details

---

Unique names

---

Close icons

---

Re-ordering

This order can be persisted between sessions (enabled by default).

---

Picking

---

Pinning

---

Custom areas

see :help bufferline-custom-areas

How do I see only buffers per tab?

This behaviour is not native in neovim there is no internal concept of localised buffers to tabs as that is not how tabs were designed to work. They were designed to show an arbitrary layout of windows per tab.

You can get this behaviour using scope.nvim with this plugin. Although I believe a better long-term solution for users who want this functionality is to ask for real native support for this upstream.

Caveats

• This won't appeal to everyone's tastes. This plugin is opinionated about how the tabline looks, it's unlikely to please everyone.

• I want to prevent this becoming a pain to maintain so I'll be conservative about what I add.

• This plugin relies on some basic highlights being set by your colour scheme i.e. Normal, String, TabLineSel (WildMenu as fallback), Comment. It's unlikely to work with all colour schemes. You can either try manually overriding the colours or manually creating these highlight groups before loading this plugin.

• If the contrast in your colour scheme isn't very high, think an all black colour scheme, some of the highlights of this plugin won't really work as intended since it depends on darkening things.

FAQ

• Why isn't the bufferline appearing?

  The most common reason for this that has come up in various issues is it clashes with another plugin. Please make sure that you do not have another bufferline plugin installed.

  If you are using airline make sure you set let g:airline#extensions#tabline#enabled = 0. If you are using lightline this also takes over the tabline by default and needs to be deactivated.

  If you are on Windows and use the GUI version of nvim (nvim-qt.exe) then also ensure, that GuiTabline is disabled. For this create a file called ginit.vim in your nvim config directory and put the line GuiTabline 0 in it. Otherwise the QT tabline will overlay any terminal tablines.

• Doesn't this plugin go against the "vim way"?

  This is much better explained by buftablines's author. Please read this for a more comprehensive answer to this question. The short answer to this is buffers represent files in nvim and tabs, a collection of windows (or just one). Vim natively allows visualising tabs i.e. collections of window, but not just the files that are open. There are endless debates on this topic, but allowing a user to see what files they have open doesn't go against any clearly stated vim philosophy. It's a text editor and not a religion 🙏. Obviously this won't appeal to everyone, which isn't really a feasible objective anyway.

bufferline.nvim's Issues

Attempt to index global 'Buffer' (a nil value)

Hi!
I tried your plugin, but have an error:

E5108: Error executing lua .../pack/plugins/start/nvim-bufferline.lua/lua/bufferline.lua:499: attempt to index global 'Buffer' (a nil value)

I just cloned your plugin to start folder (plugins that loaded automatically via built-in Neovim package manager), opened Neovim and executed lua require'bufferline'.setup().
If I put lua require'bufferline'.setup() to my configuration It does nothing, so I executed it after startup to see the error.

I using latest Neovim nightly.

[feature request] add modified buffer name highlight

hey!
is there an ability to add hl to modified buffer in the list? like to have modified yellow, non-modified white, current blue

Different icon / highlight for active buffer_close_icon

Is there any way I could change the icon for the active buffer's close icon? or at least make it colored different like red colored close icon only for the active buffer's tab

How to skip some buffers from getting listed?

Hi @akinsho, hope you're doing well. I'm starting to use vim-dispatch to connect to servers, but I noticed that when I do so a new buffer get listed.

Is there a way to skip those buffer from getting listed? thanks

Bug: attempt to call field 'is_test' (a nil value)

On the latest Neovim nightly and with the latest version of the Bufferline, when starting a new session, presented with the following error:

E5108: Error executing lua ...nvim/plugged/nvim-bufferline.lua/lua/bufferline.lua:45: attempt to call field 'is_test' (a nil value)

The error might be as a result of code changes in the past 3 or so days.

show bufferline only when two or more buffers are open

Hi. First of all thank you for the great plugin. Out of all bufferline-plugins I finally found one which does a good job. I especially like the mouse support. Would it be possible to show the bufferline only when two or more buffers are open?

weird highlights in tabs

I've been trying to figure out how the highlights in the tab bar work fully, but I can't figure out how to deal with the diagnostic-indicator text being a different background and foreground than the rest of the tab,...

I'd like this to have the same background as the rest of the tab, obviously... Idk if this is a bug or a "I don't get it", but either way, help would be greatly appreciated ^^'

Buffer switch have a delay

There will be a significant delay when buffer switching when use leader number. see gif leader 1 is slow.. And reduce the space of buffer number with buffer name. I want my colorscheme support nvim-bufferline. need provide all highlightgroup

Close buffer with rightclick

I think it would be great if it would be possible to close a buffer by clicking on it with the right mouse-button. This would have the following benefits:

• Safe space by removing the close-symbol
• Less visual clutter/noise
• Closing buffer becomes easier because you dont have to click exactly on the small area of the close-symbol

Invalid highlight name : Comment

Hi there , bufferline was working fine for me before but updating it today got me this error

How to deal the confict with lightline?

Hello, If I has plugin lightline, the tabline will use lightline's tabline other than nvim-bufferline.lua, how to deal it?

I want to use lightline's status line and nvim-bufferline.lua's tabline/bufferline.

Option to ensure that the terminal buffer won’t be hidden

The terminal buffer tab would become hidden if I switched to another buffer. Is there any way to prevent it from doing so?

Unable to configure highlighting

Hi! I am trying to change the highlight settings and when copying any parameter and the documentation, I get the error:

vim.cmd('packadd nvim-bufferline.lua')

require'bufferline'.setup{
  highlights = {
    fill = {
      guifg = comment_fg,
      guibg = separator_background_color
    },
  };
}

Error detected while processing ColorScheme Autocommands for "*":
Failed setting BufferLineFill highlight, something isn't configured correctly
Vim(highlight):E411: highlight group not found: BufferLineFill

Am I doing something wrong? I have it installed in opt dir and my configuration in lua.

Duplicate tag "bufferline-lua-highlights" in doc file?

Doesn't run on startup, have to re-source init.vim

Not very familiar with how Lua plugin calls work. I tried adding the require from the help/manual to my init.vim, and I've tried a number of other variations including:
require("bufferline").setup{}
and

lua << EOF
  require("bufferline").setup{}
EOF

but none of them work on startup. They all, however, work when I re-source my init.vim after startup.

I'm sure I'm doing something dumb, just dunno what.

when instaling bufferline with plug I cannot open checkhealth

I have installed bufferline and when I try to do a :checkhealth, neovim is stuck for ever.

If I remove bufferline :checkhealth is working

I have NVIM 0.5.0-dev

No longer works?

Recently did a :PlugUpdate and buffer tabs were not showing up.

my minimal .vimrc (.vimrc-test). I launch with nvim -u ~/.vimrc-test

call plug#begin("~/.vim" . '/bundle')
Plug 'akinsho/nvim-bufferline.lua'
call plug#end()

Result of nvim --version

NVIM v0.5.0-dev+1229-g91cdc1198
Build type: Release
LuaJIT 2.1.0-beta3
Compilation: /usr/bin/cc -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2 -DNDEBUG -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/home/loshjawrence/clones/neovim/build/config -I/home/loshjawrence/clones/neovim/src -I/home/loshjawrence/clones/neovim/.deps/usr/include -I/usr/include -I/home/loshjawrence/clones/neovim/build/src/nvim/auto -I/home/loshjawrence/clones/neovim/build/include
Compiled by loshjawrence@Lappy486

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/local/share/nvim"

Run :checkhealth for more info

Also when I try to run with my normal .vimrc that has this configuration

" nvim-bufferline
:lua << EOF
  local hlColor = "GreenYellow"
  require'bufferline'.setup{
    -- override some options from their defaults
    options = {
        tab_size = 12,
        max_name_length = 40,
        show_buffer_close_icons = false,
    },
     highlights = {
         buffer_selected = {
             guifg = "Black",
             guibg = hlColor,
             gui = "bold",
         },
         -- Accent the split buffer thats not selected
         buffer_visible = {
             guifg = hlColor,
         },
     },
  }
EOF

I get this error on startup:

show only tabs

is it possible configure the plugin to show only tabs?
like let g:airline#extensions#tabline#enabled = 1 in airline

Add command to sort buffers

Add possibility to sort buffers on the fly

Expose a module function to sort buffers. I think even creating some commands for it would be a good idea too, as well as keymapping examples.

E.g.:

After sorting by directory:

"[nvim-bufferline] is not a valid highlight group"

(sorry, published the issue too early with a blank description)

I tried to modify the color of the tab bar at the top using the instructions in the README with small modification. Here's my entire nvim-bufferline section from init.nvim

lua require'bufferline'.setup {
            \ options = {
            \   show_buffer_close_icons = false,
            \   max_name_length = 40
            \ },
            \ highlights = {
            \   fill = {
            \     guifg = 'black',
            \     guibg = '#b2b2b2'
            \   };
            \ },
            \ }

The configuration works, the colors do change, but I get a " is not a valid highlight group" error on startup.

I assume I'm missing something really obvious but I'm not sure what it is. I'd appreciate any tips.

Issues when setup

Getting this error when calling setup

terminated by signal SIGSEGV (Address boundary error)

When shows something like this

and updates colorscheme

Error detected while processing ColorScheme Autocommands for "*":
Failed setting BufferLineSelectedIndicator highlight, something isn't configured correctly
Vim(highlight):E411: highlight group not found: BufferLineSelectedIndicator
Failed setting BufferLineModifiedSelected highlight, something isn't configured correctly
Vim(highlight):E411: highlight group not found: BufferLineModifiedSelected
Failed setting BufferLineModifiedInactive highlight, something isn't configured correctly
Vim(highlight):E411: highlight group not found: BufferLineModifiedInactive

Help: Only vim's tabline show up?

This sounds stupid, but how do I activate this plugin?
After install Plug 'akinsho/nvim-bufferline.lua' and require'bufferline'.setup{}, I only saw the vim's tabline show up. It only show the title of the active buffer in a tab, even though the buffer list show multiple buffer?

What did I miss?

Edit: I use nvim 0.5

Screenshots

How can i set the numbers on the right not to show?

I tried setting:

require"bufferline".setup {
  options = {
    view = "multiwindow",
    numbers = 'none',
    number_style = '',
  }
}

EDIT: the separator_style won't work as well, i tried setting it like this right now:

And the tab styling remains the same, the default one.

The file's icon only shows left half in Windows Terminal

vs code's terminal

Windows Terminal

I try to change the code to move the white space right before the filename to the position right after the icon. And then the icon shows properly in Windows Terminal. But I am not sure whether it will have influence on other functions.

Is there a way to hide certain buffers

Great plugin. Is there a way to hide certain buffers. Specifically I want to not have my terminal buffer in the buffer line.

Buffer cycling is broken with directory sort enabled

Currently if you set sort = 'directory' selecting CycleNext or the reverse direction selects the wrong buffer 😔

Special characters in file name are not escaped properly.

When the file name contains special characters, the buffer line will not present the proper name. Such as a%.txt is shown as aa%.txtxt. This issue is quite subtle and rare(only when special characters exist), but I would be grateful if it got fixed.

Make close optional

We can currently choose to not have the close_icons for the individual tabs. However, as far as I can see, there is not way to opt out of having the close button on the far right.
https://github.com/akinsho/nvim-bufferline.lua/blob/6f104eab57f0c7f1241e4ba0da12c9d1362f589f/lua/bufferline.lua#L543

Feature Request: Additional Mappings to move between buffer

Hey @akinsho , thanks a lot for this awesome plugin, I've got the chance to try it while building my neovim configuration from scratch with lua. I like how responsive and well made it is.

If it possible and absolutely easy to accomplish

• Additional mappings to switch between buffers like bn and bp within the current tab only.
• Show only buff tabs for current buffer only.

The reason that this might be a great feature for nvim-bufferline.lua users, is that it would give users the ability to have a workspace like experience when working with buffers. Each tab can have its own buffer where navigation happens only between them.

Thanks

Highlight names from theme do not seem to be getting used

I am trying to do some tweaks to get the highlighting right and I don't want to hard code the colour values. Instead I want to derive the colours from the theme that I am using. For example, these are some highlight groups in my theme file:

" call s:hi(item, fg, bg, cterm, gui)

call s:hi('Normal' , 249 , s:bg , 'None' , 'None')
call s:hi('Cursor' , 235 , 178  , 'bold' , 'bold')

In the config file for the plugin, I set the colours as such:

buffer_selected = {
            guifg = normal_fg,
           guibg = cursor_bg,
            gui = "bold,italic"
        },

This doesn't seem to have any effect. The only way at the moment to get the colours to change is by hard coding the values. Can you please clarify how exactly one can derive the colours from the theme ?

[Bug] Hello, If I edit a file with name patter `number-chineseword`, neovim will crush.

If I use nvim-bufferline.lua, and edit a file like 516-最长回文子序列.cc, neovim crushed:

But If I not use nvim-bufferline.lua, neovim works well.

If I edit a file without - like 516最长回文.cc neovim also works well.

Is there a way to hide buffers and show only tab pages ?

Is there a way to hide buffers and show only tab pages ?

Highlight for free tab space

Hi, hope you're doing well. What is the selector to use in bufferline setup for the black empty space in the image? Been trying to set it but don't know exactly which one it is. Maybe some documenting can be done for what each selector such as Tab or Bufferline visible is? Sorry, I'm a bit of a noob.

Show only buffer in current tab?

Hay @akinsho, hope your doing great. I wonder if it is possible somehow to hide buffer from other tabs and making the buffer line showing only a tab buffer?

Thanks

Cannot style seperator background color when seperator_style = "slant" is configured

I've added fill guibg color and it doesn't work while seperator_style = "slant".
I also tried to set background and seperator styles with no success.
I try to get #282828 as background color as it fits style much better than black background.

Preview:

As you can see, seperator backgrounds are black and not #282828. Right side has correct color applied. Background color changes when I switch to light theme, so there should be something that I could configure.

My current configuration:

vim.o.termguicolors = true

require "bufferline".setup {
  highlights = {
        fill = {
            guibg = "#282828"
        },
    },
    options = {
        modified_icon = "●",
        left_trunc_marker = "",
        right_trunc_marker = "",
        max_name_length = 25,
        max_prefix_length = 25,
        enforce_regular_tabs = false,
        view = "multiwindow",
        show_buffer_close_icons = false,
        show_close_icon = false
        separator_style = "slant",
    }
}

Unique buffer names does not work

I'm expecting both init.lua files are prefixed with folder names in the buffers but apparently, they are not.

Do I need to enable it somehow? I didn't find it in the docs.

Screenshot:

Buffers not working as expected

It seems that the way bufferline handles buffers is not quite the same as how it normally works.
When I use the mouse to close tabs, it works as expected. However, when I use :q to close the buffer, bufferline doesn't reflect that. When I use the mouse to close the tab, it doesn't look like it actually closes the buffer. Any idea if it's possible to sync bufferline with the acutal buffer list? Or am I configuring this wrong?

tab height and tab styling

how do I increase tab height? also changing tab styling to this :
didnt find anything about tab styling in the example configs

Ignore terminal buffer in bufferline

I make a floatwindow to show some command in terminal. It always show in bufferline when I close this floatwindow.

Changing background of unselected buffer doesn't work

In the following minimal vimrc I am trying to change every background to red. It works for some backgrounds like for the selected buffer and the tabs but not for the unselected buffers:

set runtimepath+=~/.local/share/nvim/plugins/nvim-bufferline.lua/
set termguicolors
lua require'bufferline'.setup {
\    highlights = {
\        bufferline_tab = {
\            guibg = "red",
\        };
\        bufferline_tab_selected = {
\            guibg = "red",
\        };
\        bufferline_buffer = {
\            guibg = "red",
\        };
\        bufferline_buffer_inactive = {
\            guibg = "red",
\        };
\        bufferline_modified = {
\            guibg = "red",
\        };
\        bufferline_separator = {
\            guibg = "red",
\        };
\        bufferline_selected = {
\            guibg = "red",
\        };
\    },
\}

disable separator

hi again !
is there an ability to disable separators completely?
im trying to achieve minimal ui, and want to see just icon and name

Bug: Icon highlight always has darker background

Here's an example:

EDIT: so this might be because of my theme

[feature request] highlight the entire buffer background

Hi!

First of all, thank you for this awesome plugin!

I am wondering if it is possible to highlight the entire background of a buffer when it has any errors, warnings, infos or any diagnostics.

From what I have tried, I succeded in having a entire background color if the buffer has no errors and so on by setting buffer_selected, indicator_selected ...

But when an error appears in the buffer, only the filename's bg changes color.

So I was wondering if something like buffer_selected_all, error_selected_all would be possbile.

Thanks again for this awesome plugin! 😁

plugin makes vim freeze with 100% load cpu

Hey!
First things first - thanks for the plugin, its super cool 👍

Now the issue:

Pre-conditions:

• install bufferline & vim-fugitive

Steps:

• in git repo go to file X, make some changes, save buffer
• call :G to view git status ( file X should be there )
• place cursor on file X line and type dv to show diffs for a file

ER: diffs should be viewed
AR: nvim freezes

[Question]how to apply two fonts like you demo?

That looks pretty cool and it is really useful.
Thx a lot~

Buffer grouping

One thing I've thought a lot about since I discovered emacs' Centaur tabs is it's buffer groups I was initially against the idea since it seemed like an extra layer on top of vim that doesn't really exist natively. But with sorting added we already essentially have this layer on top of nvim 🤔 .

Anyway a first pass at this functionality would be added a way of first creating a group, then assigning buffers to a group. Visually groups would be clustered together +/- a way to separate them from each other or indicate that a buffer was in a particular group

The primary value of the groups would be visually seeing similar things clustered e.g. test files or some other dimension for sorting that isn't just an extension or directory. It would also have the benefit of allowing a user to interact with those buffers as a group

E5113: Error while calling lua chunk loop or previous error loading module 'bufferline'

I get the following error when I try to add a lua file that contains the following require'bufferline'.setup() in order to load this plugin.
E5113: Error while calling lua chunk: /home/paradox_supreme/.config/nvim/lua/bufferline.lua:1: loop or previous error
loading module 'bufferline'

FeatureRequesst: Buffer picking mode

check barbar.nvim it has buffer pick mode the behavior like easymotion , can jump to buffer by letters. code in here.
https://github.com/romgrk/barbar.nvim/blob/master/plugin/bufferline.vim#L478

preview in here https://github.com/romgrk/barbar.nvim#jump-to-buffer

Error executing lua [string ":lua" ]:1: module 'bufferline' not found

Error:
Error executing lua [string ":lua" ]:1: module 'bufferline' not found

Solution:
I'm using vim-plug to install bufferline. previously I had the setup call within plug#begin and plug#end blocks. call lua require'bufferline'.setup() after plug#end fixed the issue

call plug#begin()
Plug 'akinsho/nvim-bufferline.lua'
call plug#end()
set termguicolors
lua require'bufferline'.setup()