LunarVim/plug-config/barbar.vim

let bufferline = {}

" Show a shadow over the editor in buffer-pick mode
let bufferline.shadow = v:true

" Enable/disable icons
let bufferline.icons = v:true

" Enables/disable clickable tabs
"  - left-click: go to buffer
"  - middle-click: delete buffer
"
" NOTE disabled by default because this might cause E541 (too many items)
"      if you have many tabs open
let bufferline.clickable = v:true

" If set, the letters for each buffer in buffer-pick mode will be
" assigned based on their name. Otherwise or in case all letters are
" already assigned, the behavior is to assign letters in order of
" usability (see order below)
let bufferline.semantic_letters = v:true

" New buffer letters are assigned in this order. This order is
" optimal for the qwerty keyboard layout but might need adjustement
" for other layouts.
let bufferline.letters = 
  \ 'asdfjkl;ghnmxcbziowerutyqpASDFJKLGHNMXCBZIOWERUTYQP'

let bg_current = get(nvim_get_hl_by_name('Normal',     1), 'background', '#000000')
let bg_visible = get(nvim_get_hl_by_name('TabLineSel', 1), 'background', '#000000')
let bg_inactive = get(nvim_get_hl_by_name('TabLine',   1), 'background', '#000000')

" For the current active buffer
hi default link BufferCurrent      Normal
" For the current active buffer when modified
hi default link BufferCurrentMod   Normal
" For the current active buffer icon
hi default link BufferCurrentSign  Normal
" For the current active buffer target when buffer-picking
exe 'hi default BufferCurrentTarget   guifg=red gui=bold guibg=' . bg_current

" For buffers visible but not the current one
hi default link BufferVisible      TabLineSel
hi default link BufferVisibleMod   TabLineSel
hi default link BufferVisibleSign  TabLineSel
exe 'hi default BufferVisibleTarget   guifg=red gui=bold guibg=' . bg_visible

" For buffers invisible buffers
hi default link BufferInactive     TabLine
hi default link BufferInactiveMod  TabLine
hi default link BufferInactiveSign TabLine
exe 'hi default BufferInactiveTarget   guifg=red gui=bold guibg=' . bg_inactive


" For the shadow in buffer-picking mode
hi default BufferShadow guifg=#000000 guibg=#000000