kickstart.nvim/lua/plugins/bufferline.lua

return {
  "akinsho/bufferline.nvim",
  version = "*", 
  dependencies = 'nvim-tree/nvim-web-devicons',
  opts = {
    options = {
      numbers = "none", -- | "ordinal" | "buffer_id" | "both" | function({ ordinal, id, lower, raise }): string,
      close_command = "Bdelete! %d", -- can be a string | function, see "Mouse actions"
      right_mouse_command = "Bdelete! %d", -- can be a string | function, see "Mouse actions"
      left_mouse_command = "buffer %d", -- can be a string | function, see "Mouse actions"
      middle_mouse_command = nil, -- can be a string | function, see "Mouse actions"
      -- NOTE: this plugin is designed with this icon in mind,
      -- and so changing this is NOT recommended, this is intended
      -- as an escape hatch for people who cannot bear it for whatever reason
      indicator_icon = "▎",
      buffer_close_icon = "",
      -- buffer_close_icon = '',
      modified_icon = "●",
      close_icon = "",
      -- close_icon = '',
      left_trunc_marker = "",
      right_trunc_marker = "",
      --- name_formatter can be used to change the buffer's label in the bufferline.
      --- Please note some names can/will break the
      --- bufferline so use this at your discretion knowing that it has
      --- some limitations that will *NOT* be fixed.
      -- name_formatter = function(buf)  -- buf contains a "name", "path" and "bufnr"
      --   -- remove extension from markdown files for example
      --   if buf.name:match('%.md') then
      --     return vim.fn.fnamemodify(buf.name, ':t:r')
      --   end
      -- end,
      max_name_length = 30,
      max_prefix_length = 30, -- prefix used when a buffer is de-duplicated
      tab_size = 16,
      diagnostics = false, -- | "nvim_lsp" | "coc",
      diagnostics_update_in_insert = false,
      offsets = {
          {
              filetype = "NvimTree",
              text = "File Explorer",
              text_align = "left",
              separator = true,
          }
      },
      show_buffer_icons = true,
      show_buffer_close_icons = true,
      show_close_icon = true,
      show_tab_indicators = true,
      persist_buffer_sort = true, -- whether or not custom sorted buffers should persist
      -- can also be a table containing 2 custom separators
      -- [focused and unfocused]. eg: { '|', '|' }
      separator_style = "thin", -- | "thick" | "thin" | { 'any', 'any' },
      enforce_regular_tabs = true,
      always_show_bufferline = true,
      -- sort_by = 'id' | 'extension' | 'relative_directory' | 'directory' | 'tabs' | function(buffer_a, buffer_b)
      --   -- add custom logic
      --   return buffer_a.modified > buffer_b.modified
      -- end
      highlights = {
        fill = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },
        background = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },

        buffer_visible = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },

        close_button = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },
        close_button_visible = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },
        -- close_button_selected = {
        --   guifg = {attribute='fg',highlight='TabLineSel'},
        --   guibg ={attribute='bg',highlight='TabLineSel'}
        --   },

        tab_selected = {
          guifg = { attribute = "fg", highlight = "Normal" },
          guibg = { attribute = "bg", highlight = "Normal" },
        },
        tab = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },
        tab_close = {
          -- guifg = {attribute='fg',highlight='LspDiagnosticsDefaultError'},
          guifg = { attribute = "fg", highlight = "TabLineSel" },
          guibg = { attribute = "bg", highlight = "Normal" },
        },

        duplicate_selected = {
          guifg = { attribute = "fg", highlight = "TabLineSel" },
          guibg = { attribute = "bg", highlight = "TabLineSel" },
          gui = "italic",
        },
        duplicate_visible = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
          gui = "italic",
        },
        duplicate = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
          gui = "italic",
        },

        modified = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },
        modified_selected = {
          guifg = { attribute = "fg", highlight = "Normal" },
          guibg = { attribute = "bg", highlight = "Normal" },
        },
        modified_visible = {
          guifg = { attribute = "fg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },

        separator = {
          guifg = { attribute = "bg", highlight = "TabLine" },
          guibg = { attribute = "bg", highlight = "TabLine" },
        },
        separator_selected = {
          guifg = { attribute = "bg", highlight = "Normal" },
          guibg = { attribute = "bg", highlight = "Normal" },
        },
        -- separator_visible = {
        --   guifg = {attribute='bg',highlight='TabLine'},
        --   guibg = {attribute='bg',highlight='TabLine'}
        --   },
        indicator_selected = {
          guifg = { attribute = "fg", highlight = "LspDiagnosticsDefaultHint" },
          guibg = { attribute = "bg", highlight = "Normal" },
        },
      }
    }
  }
}